annotate include/SDL_video.h @ 1658:e49147870aac SDL-1.3

glSDL support
author Sam Lantinga <slouken@libsdl.org>
date Mon, 01 May 2006 06:58:33 +0000
parents 96c2f89cc7e1
children 8b9d79e7eacf
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Header file for access to the SDL raw framebuffer window */
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24
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25 #ifndef _SDL_video_h
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26 #define _SDL_video_h
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27
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28 #include "SDL_stdinc.h"
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29 #include "SDL_error.h"
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30 #include "SDL_rwops.h"
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31
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32 #include "begin_code.h"
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33 /* Set up for C function definitions, even when using C++ */
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34 #ifdef __cplusplus
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35 extern "C" {
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36 #endif
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37
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38 /* Transparency definitions: These define alpha as the opacity of a surface */
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39 #define SDL_ALPHA_OPAQUE 255
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40 #define SDL_ALPHA_TRANSPARENT 0
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41
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42 /* Useful data types */
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43 typedef struct SDL_Rect {
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44 Sint16 x, y;
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45 Uint16 w, h;
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46 } SDL_Rect;
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47
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48 typedef struct SDL_Color {
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49 Uint8 r;
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50 Uint8 g;
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51 Uint8 b;
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52 Uint8 unused;
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53 } SDL_Color;
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54 #define SDL_Colour SDL_Color
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55
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56 typedef struct SDL_Palette {
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57 int ncolors;
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58 SDL_Color *colors;
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59 } SDL_Palette;
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60
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61 /* Everything in the pixel format structure is read-only */
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62 typedef struct SDL_PixelFormat {
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63 SDL_Palette *palette;
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64 Uint8 BitsPerPixel;
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65 Uint8 BytesPerPixel;
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66 Uint8 Rloss;
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67 Uint8 Gloss;
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68 Uint8 Bloss;
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69 Uint8 Aloss;
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70 Uint8 Rshift;
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71 Uint8 Gshift;
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72 Uint8 Bshift;
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73 Uint8 Ashift;
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74 Uint32 Rmask;
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75 Uint32 Gmask;
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76 Uint32 Bmask;
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77 Uint32 Amask;
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78
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79 /* RGB color key information */
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80 Uint32 colorkey;
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81 /* Alpha value information (per-surface alpha) */
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82 Uint8 alpha;
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83 } SDL_PixelFormat;
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84
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85 /* This structure should be treated as read-only, except for 'pixels',
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86 which, if not NULL, contains the raw pixel data for the surface.
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87 */
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88 typedef struct SDL_Surface {
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89 Uint32 flags; /* Read-only */
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90 SDL_PixelFormat *format; /* Read-only */
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91 int w, h; /* Read-only */
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92 Uint16 pitch; /* Read-only */
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93 void *pixels; /* Read-write */
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94 int offset; /* Private */
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95
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96 /* Hardware-specific surface info */
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97 struct private_hwdata *hwdata;
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98
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99 /* clipping information */
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100 SDL_Rect clip_rect; /* Read-only */
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101 Uint32 unused1; /* for binary compatibility */
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102
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103 /* Allow recursive locks */
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104 Uint32 locked; /* Private */
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105
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106 /* info for fast blit mapping to other surfaces */
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107 struct SDL_BlitMap *map; /* Private */
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108
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109 /* format version, bumped at every change to invalidate blit maps */
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110 unsigned int format_version; /* Private */
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111
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112 /* Reference count -- used when freeing surface */
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113 int refcount; /* Read-mostly */
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114 } SDL_Surface;
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115
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116 /* These are the currently supported flags for the SDL_surface */
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117 /* Available for SDL_CreateRGBSurface() or SDL_SetVideoMode() */
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118 #define SDL_SWSURFACE 0x00000000 /* Surface is in system memory */
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119 #define SDL_HWSURFACE 0x00000001 /* Surface is in video memory */
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120 #define SDL_ASYNCBLIT 0x00000004 /* Use asynchronous blits if possible */
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121 /* Available for SDL_SetVideoMode() */
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122 #define SDL_ANYFORMAT 0x10000000 /* Allow any video depth/pixel-format */
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123 #define SDL_HWPALETTE 0x20000000 /* Surface has exclusive palette */
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124 #define SDL_DOUBLEBUF 0x40000000 /* Set up double-buffered video mode */
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125 #define SDL_FULLSCREEN 0x80000000 /* Surface is a full screen display */
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126 #define SDL_OPENGL 0x00000002 /* Create an OpenGL rendering context */
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127 #define SDL_INTERNALOPENGL 0x00000008 /* SDL uses OpenGL internally for this window */
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128 #define SDL_RESIZABLE 0x00000010 /* This video mode may be resized */
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129 #define SDL_NOFRAME 0x00000020 /* No window caption or edge frame */
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130 /* Used internally (read-only) */
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131 #define SDL_HWACCEL 0x00000100 /* Blit uses hardware acceleration */
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132 #define SDL_SRCCOLORKEY 0x00001000 /* Blit uses a source color key */
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133 #define SDL_RLEACCELOK 0x00002000 /* Private flag */
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134 #define SDL_RLEACCEL 0x00004000 /* Surface is RLE encoded */
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135 #define SDL_SRCALPHA 0x00010000 /* Blit uses source alpha blending */
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136 #define SDL_PREALLOC 0x01000000 /* Surface uses preallocated memory */
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137
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138 /* Evaluates to true if the surface needs to be locked before access */
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139 #define SDL_MUSTLOCK(surface) \
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140 (surface->offset || \
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141 ((surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_RLEACCEL)) != 0))
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142
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143 /* typedef for private surface blitting functions */
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144 typedef int (*SDL_blit)(struct SDL_Surface *src, SDL_Rect *srcrect,
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145 struct SDL_Surface *dst, SDL_Rect *dstrect);
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146
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147
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148 /* Useful for determining the video hardware capabilities */
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149 typedef struct SDL_VideoInfo {
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150 Uint32 hw_available :1; /* Flag: Can you create hardware surfaces? */
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151 Uint32 wm_available :1; /* Flag: Can you talk to a window manager? */
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152 Uint32 UnusedBits1 :6;
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153 Uint32 UnusedBits2 :1;
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154 Uint32 blit_hw :1; /* Flag: Accelerated blits HW --> HW */
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155 Uint32 blit_hw_CC :1; /* Flag: Accelerated blits with Colorkey */
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156 Uint32 blit_hw_A :1; /* Flag: Accelerated blits with Alpha */
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157 Uint32 blit_sw :1; /* Flag: Accelerated blits SW --> HW */
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158 Uint32 blit_sw_CC :1; /* Flag: Accelerated blits with Colorkey */
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159 Uint32 blit_sw_A :1; /* Flag: Accelerated blits with Alpha */
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160 Uint32 blit_fill :1; /* Flag: Accelerated color fill */
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161 Uint32 UnusedBits3 :16;
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162 Uint32 video_mem; /* The total amount of video memory (in K) */
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163 SDL_PixelFormat *vfmt; /* Value: The format of the video surface */
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164 int current_w; /* Value: The current video mode width */
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165 int current_h; /* Value: The current video mode height */
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166 } SDL_VideoInfo;
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167
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168
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169 /* The most common video overlay formats.
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170 For an explanation of these pixel formats, see:
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171 http://www.webartz.com/fourcc/indexyuv.htm
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172
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173 For information on the relationship between color spaces, see:
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174 http://www.neuro.sfc.keio.ac.jp/~aly/polygon/info/color-space-faq.html
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175 */
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176 #define SDL_YV12_OVERLAY 0x32315659 /* Planar mode: Y + V + U (3 planes) */
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177 #define SDL_IYUV_OVERLAY 0x56555949 /* Planar mode: Y + U + V (3 planes) */
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178 #define SDL_YUY2_OVERLAY 0x32595559 /* Packed mode: Y0+U0+Y1+V0 (1 plane) */
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179 #define SDL_UYVY_OVERLAY 0x59565955 /* Packed mode: U0+Y0+V0+Y1 (1 plane) */
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180 #define SDL_YVYU_OVERLAY 0x55595659 /* Packed mode: Y0+V0+Y1+U0 (1 plane) */
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181
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182 /* The YUV hardware video overlay */
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183 typedef struct SDL_Overlay {
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184 Uint32 format; /* Read-only */
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185 int w, h; /* Read-only */
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186 int planes; /* Read-only */
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187 Uint16 *pitches; /* Read-only */
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188 Uint8 **pixels; /* Read-write */
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189
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190 /* Hardware-specific surface info */
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191 struct private_yuvhwfuncs *hwfuncs;
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192 struct private_yuvhwdata *hwdata;
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193
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194 /* Special flags */
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195 Uint32 hw_overlay :1; /* Flag: This overlay hardware accelerated? */
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196 Uint32 UnusedBits :31;
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197 } SDL_Overlay;
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198
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199
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200 /* Public enumeration for setting the OpenGL window attributes. */
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201 typedef enum {
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202 SDL_GL_RED_SIZE,
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203 SDL_GL_GREEN_SIZE,
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204 SDL_GL_BLUE_SIZE,
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205 SDL_GL_ALPHA_SIZE,
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206 SDL_GL_BUFFER_SIZE,
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207 SDL_GL_DOUBLEBUFFER,
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208 SDL_GL_DEPTH_SIZE,
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209 SDL_GL_STENCIL_SIZE,
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210 SDL_GL_ACCUM_RED_SIZE,
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211 SDL_GL_ACCUM_GREEN_SIZE,
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212 SDL_GL_ACCUM_BLUE_SIZE,
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213 SDL_GL_ACCUM_ALPHA_SIZE,
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214 SDL_GL_STEREO,
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215 SDL_GL_MULTISAMPLEBUFFERS,
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216 SDL_GL_MULTISAMPLESAMPLES,
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217 SDL_GL_ACCELERATED_VISUAL,
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218 SDL_GL_SWAP_CONTROL
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219 } SDL_GLattr;
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220
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221 /* flags for SDL_SetPalette() */
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222 #define SDL_LOGPAL 0x01
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223 #define SDL_PHYSPAL 0x02
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224
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225 /* Function prototypes */
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226
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227 /* These functions are used internally, and should not be used unless you
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228 * have a specific need to specify the video driver you want to use.
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229 * You should normally use SDL_Init() or SDL_InitSubSystem().
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230 *
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231 * SDL_VideoInit() initializes the video subsystem -- sets up a connection
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232 * to the window manager, etc, and determines the current video mode and
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233 * pixel format, but does not initialize a window or graphics mode.
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234 * Note that event handling is activated by this routine.
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235 *
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236 * If you use both sound and video in your application, you need to call
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237 * SDL_Init() before opening the sound device, otherwise under Win32 DirectX,
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238 * you won't be able to set full-screen display modes.
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239 */
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240 extern DECLSPEC int SDLCALL SDL_VideoInit(const char *driver_name, Uint32 flags);
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241 extern DECLSPEC void SDLCALL SDL_VideoQuit(void);
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242
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243 /* This function fills the given character buffer with the name of the
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244 * video driver, and returns a pointer to it if the video driver has
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245 * been initialized. It returns NULL if no driver has been initialized.
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246 */
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247 extern DECLSPEC char * SDLCALL SDL_VideoDriverName(char *namebuf, int maxlen);
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248
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249 /*
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250 * This function returns a pointer to the current display surface.
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251 * If SDL is doing format conversion on the display surface, this
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252 * function returns the publicly visible surface, not the real video
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253 * surface.
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254 */
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255 extern DECLSPEC SDL_Surface * SDLCALL SDL_GetVideoSurface(void);
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256
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257 /*
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258 * This function returns a read-only pointer to information about the
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259 * video hardware. If this is called before SDL_SetVideoMode(), the 'vfmt'
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260 * member of the returned structure will contain the pixel format of the
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261 * "best" video mode.
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262 */
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263 extern DECLSPEC const SDL_VideoInfo * SDLCALL SDL_GetVideoInfo(void);
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264
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265 /*
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266 * Check to see if a particular video mode is supported.
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267 * It returns 0 if the requested mode is not supported under any bit depth,
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268 * or returns the bits-per-pixel of the closest available mode with the
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269 * given width and height. If this bits-per-pixel is different from the
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270 * one used when setting the video mode, SDL_SetVideoMode() will succeed,
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271 * but will emulate the requested bits-per-pixel with a shadow surface.
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272 *
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273 * The arguments to SDL_VideoModeOK() are the same ones you would pass to
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274 * SDL_SetVideoMode()
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275 */
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276 extern DECLSPEC int SDLCALL SDL_VideoModeOK(int width, int height, int bpp, Uint32 flags);
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277
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278 /*
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279 * Return a pointer to an array of available screen dimensions for the
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280 * given format and video flags, sorted largest to smallest. Returns
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281 * NULL if there are no dimensions available for a particular format,
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282 * or (SDL_Rect **)-1 if any dimension is okay for the given format.
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283 *
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284 * If 'format' is NULL, the mode list will be for the format given
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285 * by SDL_GetVideoInfo()->vfmt
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286 */
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287 extern DECLSPEC SDL_Rect ** SDLCALL SDL_ListModes(SDL_PixelFormat *format, Uint32 flags);
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288
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289 /*
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290 * Set up a video mode with the specified width, height and bits-per-pixel.
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291 *
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292 * If 'bpp' is 0, it is treated as the current display bits per pixel.
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293 *
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294 * If SDL_ANYFORMAT is set in 'flags', the SDL library will try to set the
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295 * requested bits-per-pixel, but will return whatever video pixel format is
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296 * available. The default is to emulate the requested pixel format if it
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297 * is not natively available.
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298 *
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299 * If SDL_HWSURFACE is set in 'flags', the video surface will be placed in
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300 * video memory, if possible, and you may have to call SDL_LockSurface()
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301 * in order to access the raw framebuffer. Otherwise, the video surface
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302 * will be created in system memory.
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303 *
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304 * If SDL_ASYNCBLIT is set in 'flags', SDL will try to perform rectangle
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305 * updates asynchronously, but you must always lock before accessing pixels.
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306 * SDL will wait for updates to complete before returning from the lock.
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307 *
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308 * If SDL_HWPALETTE is set in 'flags', the SDL library will guarantee
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309 * that the colors set by SDL_SetColors() will be the colors you get.
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310 * Otherwise, in 8-bit mode, SDL_SetColors() may not be able to set all
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311 * of the colors exactly the way they are requested, and you should look
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312 * at the video surface structure to determine the actual palette.
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313 * If SDL cannot guarantee that the colors you request can be set,
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314 * i.e. if the colormap is shared, then the video surface may be created
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315 * under emulation in system memory, overriding the SDL_HWSURFACE flag.
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316 *
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317 * If SDL_FULLSCREEN is set in 'flags', the SDL library will try to set
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318 * a fullscreen video mode. The default is to create a windowed mode
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319 * if the current graphics system has a window manager.
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320 * If the SDL library is able to set a fullscreen video mode, this flag
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321 * will be set in the surface that is returned.
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322 *
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323 * If SDL_DOUBLEBUF is set in 'flags', the SDL library will try to set up
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324 * two surfaces in video memory and swap between them when you call
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325 * SDL_Flip(). This is usually slower than the normal single-buffering
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326 * scheme, but prevents "tearing" artifacts caused by modifying video
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327 * memory while the monitor is refreshing. It should only be used by
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328 * applications that redraw the entire screen on every update.
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329 *
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330 * If SDL_RESIZABLE is set in 'flags', the SDL library will allow the
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331 * window manager, if any, to resize the window at runtime. When this
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332 * occurs, SDL will send a SDL_VIDEORESIZE event to you application,
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333 * and you must respond to the event by re-calling SDL_SetVideoMode()
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334 * with the requested size (or another size that suits the application).
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335 *
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336 * If SDL_NOFRAME is set in 'flags', the SDL library will create a window
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337 * without any title bar or frame decoration. Fullscreen video modes have
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338 * this flag set automatically.
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339 *
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340 * This function returns the video framebuffer surface, or NULL if it fails.
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341 *
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342 * If you rely on functionality provided by certain video flags, check the
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343 * flags of the returned surface to make sure that functionality is available.
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344 * SDL will fall back to reduced functionality if the exact flags you wanted
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345 * are not available.
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346 */
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347 extern DECLSPEC SDL_Surface * SDLCALL SDL_SetVideoMode
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348 (int width, int height, int bpp, Uint32 flags);
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349
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350 /*
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351 * Makes sure the given list of rectangles is updated on the given screen.
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352 * If 'x', 'y', 'w' and 'h' are all 0, SDL_UpdateRect will update the entire
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353 * screen.
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354 * These functions should not be called while 'screen' is locked.
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355 */
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356 extern DECLSPEC void SDLCALL SDL_UpdateRects
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357 (SDL_Surface *screen, int numrects, SDL_Rect *rects);
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358 extern DECLSPEC void SDLCALL SDL_UpdateRect
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359 (SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h);
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360
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361 /*
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362 * On hardware that supports double-buffering, this function sets up a flip
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363 * and returns. The hardware will wait for vertical retrace, and then swap
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364 * video buffers before the next video surface blit or lock will return.
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365 * On hardware that doesn not support double-buffering, this is equivalent
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366 * to calling SDL_UpdateRect(screen, 0, 0, 0, 0);
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367 * The SDL_DOUBLEBUF flag must have been passed to SDL_SetVideoMode() when
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368 * setting the video mode for this function to perform hardware flipping.
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369 * This function returns 0 if successful, or -1 if there was an error.
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370 */
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371 extern DECLSPEC int SDLCALL SDL_Flip(SDL_Surface *screen);
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372
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373 /*
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374 * Set the gamma correction for each of the color channels.
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375 * The gamma values range (approximately) between 0.1 and 10.0
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376 *
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377 * If this function isn't supported directly by the hardware, it will
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378 * be emulated using gamma ramps, if available. If successful, this
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379 * function returns 0, otherwise it returns -1.
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380 */
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381 extern DECLSPEC int SDLCALL SDL_SetGamma(float red, float green, float blue);
0
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382
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383 /*
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384 * Set the gamma translation table for the red, green, and blue channels
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385 * of the video hardware. Each table is an array of 256 16-bit quantities,
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386 * representing a mapping between the input and output for that channel.
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387 * The input is the index into the array, and the output is the 16-bit
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388 * gamma value at that index, scaled to the output color precision.
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389 *
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390 * You may pass NULL for any of the channels to leave it unchanged.
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391 * If the call succeeds, it will return 0. If the display driver or
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392 * hardware does not support gamma translation, or otherwise fails,
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393 * this function will return -1.
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394 */
665
d27aab66c5d6 *** empty log message ***
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395 extern DECLSPEC int SDLCALL SDL_SetGammaRamp(const Uint16 *red, const Uint16 *green, const Uint16 *blue);
0
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396
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397 /*
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398 * Retrieve the current values of the gamma translation tables.
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399 *
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400 * You must pass in valid pointers to arrays of 256 16-bit quantities.
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401 * Any of the pointers may be NULL to ignore that channel.
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402 * If the call succeeds, it will return 0. If the display driver or
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403 * hardware does not support gamma translation, or otherwise fails,
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404 * this function will return -1.
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405 */
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406 extern DECLSPEC int SDLCALL SDL_GetGammaRamp(Uint16 *red, Uint16 *green, Uint16 *blue);
0
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407
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408 /*
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409 * Sets a portion of the colormap for the given 8-bit surface. If 'surface'
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410 * is not a palettized surface, this function does nothing, returning 0.
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411 * If all of the colors were set as passed to SDL_SetColors(), it will
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412 * return 1. If not all the color entries were set exactly as given,
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413 * it will return 0, and you should look at the surface palette to
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414 * determine the actual color palette.
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415 *
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416 * When 'surface' is the surface associated with the current display, the
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417 * display colormap will be updated with the requested colors. If
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418 * SDL_HWPALETTE was set in SDL_SetVideoMode() flags, SDL_SetColors()
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419 * will always return 1, and the palette is guaranteed to be set the way
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420 * you desire, even if the window colormap has to be warped or run under
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421 * emulation.
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422 */
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423 extern DECLSPEC int SDLCALL SDL_SetColors(SDL_Surface *surface,
0
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424 SDL_Color *colors, int firstcolor, int ncolors);
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425
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426 /*
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427 * Sets a portion of the colormap for a given 8-bit surface.
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428 * 'flags' is one or both of:
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429 * SDL_LOGPAL -- set logical palette, which controls how blits are mapped
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430 * to/from the surface,
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431 * SDL_PHYSPAL -- set physical palette, which controls how pixels look on
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432 * the screen
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433 * Only screens have physical palettes. Separate change of physical/logical
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434 * palettes is only possible if the screen has SDL_HWPALETTE set.
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435 *
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436 * The return value is 1 if all colours could be set as requested, and 0
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437 * otherwise.
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438 *
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439 * SDL_SetColors() is equivalent to calling this function with
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440 * flags = (SDL_LOGPAL|SDL_PHYSPAL).
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441 */
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442 extern DECLSPEC int SDLCALL SDL_SetPalette(SDL_Surface *surface, int flags,
0
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443 SDL_Color *colors, int firstcolor,
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444 int ncolors);
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445
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446 /*
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447 * Maps an RGB triple to an opaque pixel value for a given pixel format
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448 */
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449 extern DECLSPEC Uint32 SDLCALL SDL_MapRGB
0
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450 (SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b);
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451
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452 /*
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453 * Maps an RGBA quadruple to a pixel value for a given pixel format
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454 */
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455 extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(SDL_PixelFormat *format,
0
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456 Uint8 r, Uint8 g, Uint8 b, Uint8 a);
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457
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458 /*
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459 * Maps a pixel value into the RGB components for a given pixel format
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460 */
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461 extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt,
0
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462 Uint8 *r, Uint8 *g, Uint8 *b);
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463
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464 /*
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465 * Maps a pixel value into the RGBA components for a given pixel format
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466 */
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467 extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt,
0
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468 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);
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469
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470 /*
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471 * Allocate and free an RGB surface (must be called after SDL_SetVideoMode)
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472 * If the depth is 4 or 8 bits, an empty palette is allocated for the surface.
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473 * If the depth is greater than 8 bits, the pixel format is set using the
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474 * flags '[RGB]mask'.
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475 * If the function runs out of memory, it will return NULL.
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476 *
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477 * The 'flags' tell what kind of surface to create.
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478 * SDL_SWSURFACE means that the surface should be created in system memory.
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479 * SDL_HWSURFACE means that the surface should be created in video memory,
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480 * with the same format as the display surface. This is useful for surfaces
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481 * that will not change much, to take advantage of hardware acceleration
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482 * when being blitted to the display surface.
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483 * SDL_ASYNCBLIT means that SDL will try to perform asynchronous blits with
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484 * this surface, but you must always lock it before accessing the pixels.
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485 * SDL will wait for current blits to finish before returning from the lock.
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486 * SDL_SRCCOLORKEY indicates that the surface will be used for colorkey blits.
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487 * If the hardware supports acceleration of colorkey blits between
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488 * two surfaces in video memory, SDL will try to place the surface in
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489 * video memory. If this isn't possible or if there is no hardware
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490 * acceleration available, the surface will be placed in system memory.
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491 * SDL_SRCALPHA means that the surface will be used for alpha blits and
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492 * if the hardware supports hardware acceleration of alpha blits between
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493 * two surfaces in video memory, to place the surface in video memory
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494 * if possible, otherwise it will be placed in system memory.
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495 * If the surface is created in video memory, blits will be _much_ faster,
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496 * but the surface format must be identical to the video surface format,
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497 * and the only way to access the pixels member of the surface is to use
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498 * the SDL_LockSurface() and SDL_UnlockSurface() calls.
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499 * If the requested surface actually resides in video memory, SDL_HWSURFACE
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500 * will be set in the flags member of the returned surface. If for some
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501 * reason the surface could not be placed in video memory, it will not have
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502 * the SDL_HWSURFACE flag set, and will be created in system memory instead.
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503 */
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504 #define SDL_AllocSurface SDL_CreateRGBSurface
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505 extern DECLSPEC SDL_Surface * SDLCALL SDL_CreateRGBSurface
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506 (Uint32 flags, int width, int height, int depth,
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507 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
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508 extern DECLSPEC SDL_Surface * SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels,
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509 int width, int height, int depth, int pitch,
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510 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
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511 extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface *surface);
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512
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513 /*
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514 * SDL_LockSurface() sets up a surface for directly accessing the pixels.
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515 * Between calls to SDL_LockSurface()/SDL_UnlockSurface(), you can write
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516 * to and read from 'surface->pixels', using the pixel format stored in
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517 * 'surface->format'. Once you are done accessing the surface, you should
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518 * use SDL_UnlockSurface() to release it.
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519 *
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520 * Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates
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521 * to 0, then you can read and write to the surface at any time, and the
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522 * pixel format of the surface will not change. In particular, if the
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523 * SDL_HWSURFACE flag is not given when calling SDL_SetVideoMode(), you
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524 * will not need to lock the display surface before accessing it.
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525 *
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526 * No operating system or library calls should be made between lock/unlock
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527 * pairs, as critical system locks may be held during this time.
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528 *
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529 * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.
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530 */
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531 extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface *surface);
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532 extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface *surface);
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533
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534 /*
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535 * Load a surface from a seekable SDL data source (memory or file.)
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536 * If 'freesrc' is non-zero, the source will be closed after being read.
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537 * Returns the new surface, or NULL if there was an error.
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538 * The new surface should be freed with SDL_FreeSurface().
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539 */
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540 extern DECLSPEC SDL_Surface * SDLCALL SDL_LoadBMP_RW(SDL_RWops *src, int freesrc);
0
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541
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542 /* Convenience macro -- load a surface from a file */
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543 #define SDL_LoadBMP(file) SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)
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544
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545 /*
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diff changeset
546 * Save a surface to a seekable SDL data source (memory or file.)
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547 * If 'freedst' is non-zero, the source will be closed after being written.
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548 * Returns 0 if successful or -1 if there was an error.
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549 */
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diff changeset
550 extern DECLSPEC int SDLCALL SDL_SaveBMP_RW
0
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551 (SDL_Surface *surface, SDL_RWops *dst, int freedst);
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diff changeset
552
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diff changeset
553 /* Convenience macro -- save a surface to a file */
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554 #define SDL_SaveBMP(surface, file) \
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555 SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
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556
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diff changeset
557 /*
74212992fb08 Initial revision
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parents:
diff changeset
558 * Sets the color key (transparent pixel) in a blittable surface.
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parents:
diff changeset
559 * If 'flag' is SDL_SRCCOLORKEY (optionally OR'd with SDL_RLEACCEL),
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560 * 'key' will be the transparent pixel in the source image of a blit.
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diff changeset
561 * SDL_RLEACCEL requests RLE acceleration for the surface if present,
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diff changeset
562 * and removes RLE acceleration if absent.
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parents:
diff changeset
563 * If 'flag' is 0, this function clears any current color key.
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diff changeset
564 * This function returns 0, or -1 if there was an error.
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565 */
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diff changeset
566 extern DECLSPEC int SDLCALL SDL_SetColorKey
0
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567 (SDL_Surface *surface, Uint32 flag, Uint32 key);
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568
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diff changeset
569 /*
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parents:
diff changeset
570 * This function sets the alpha value for the entire surface, as opposed to
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diff changeset
571 * using the alpha component of each pixel. This value measures the range
74212992fb08 Initial revision
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572 * of transparency of the surface, 0 being completely transparent to 255
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573 * being completely opaque. An 'alpha' value of 255 causes blits to be
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574 * opaque, the source pixels copied to the destination (the default). Note
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575 * that per-surface alpha can be combined with colorkey transparency.
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576 *
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diff changeset
577 * If 'flag' is 0, alpha blending is disabled for the surface.
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parents:
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578 * If 'flag' is SDL_SRCALPHA, alpha blending is enabled for the surface.
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diff changeset
579 * OR:ing the flag with SDL_RLEACCEL requests RLE acceleration for the
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580 * surface; if SDL_RLEACCEL is not specified, the RLE accel will be removed.
432
80a35d43a58f *** empty log message ***
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581 *
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582 * The 'alpha' parameter is ignored for surfaces that have an alpha channel.
0
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583 */
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584 extern DECLSPEC int SDLCALL SDL_SetAlpha(SDL_Surface *surface, Uint32 flag, Uint8 alpha);
0
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585
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586 /*
74212992fb08 Initial revision
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parents:
diff changeset
587 * Sets the clipping rectangle for the destination surface in a blit.
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diff changeset
588 *
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589 * If the clip rectangle is NULL, clipping will be disabled.
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590 * If the clip rectangle doesn't intersect the surface, the function will
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591 * return SDL_FALSE and blits will be completely clipped. Otherwise the
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parents:
diff changeset
592 * function returns SDL_TRUE and blits to the surface will be clipped to
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593 * the intersection of the surface area and the clipping rectangle.
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diff changeset
594 *
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595 * Note that blits are automatically clipped to the edges of the source
74212992fb08 Initial revision
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596 * and destination surfaces.
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597 */
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598 extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect);
0
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599
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diff changeset
600 /*
74212992fb08 Initial revision
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parents:
diff changeset
601 * Gets the clipping rectangle for the destination surface in a blit.
74212992fb08 Initial revision
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parents:
diff changeset
602 * 'rect' must be a pointer to a valid rectangle which will be filled
74212992fb08 Initial revision
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603 * with the correct values.
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604 */
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605 extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect);
0
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606
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parents:
diff changeset
607 /*
74212992fb08 Initial revision
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parents:
diff changeset
608 * Creates a new surface of the specified format, and then copies and maps
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parents:
diff changeset
609 * the given surface to it so the blit of the converted surface will be as
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parents:
diff changeset
610 * fast as possible. If this function fails, it returns NULL.
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parents:
diff changeset
611 *
74212992fb08 Initial revision
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diff changeset
612 * The 'flags' parameter is passed to SDL_CreateRGBSurface() and has those
74212992fb08 Initial revision
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parents:
diff changeset
613 * semantics. You can also pass SDL_RLEACCEL in the flags parameter and
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parents:
diff changeset
614 * SDL will try to RLE accelerate colorkey and alpha blits in the resulting
74212992fb08 Initial revision
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parents:
diff changeset
615 * surface.
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parents:
diff changeset
616 *
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617 * This function is used internally by SDL_DisplayFormat().
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618 */
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619 extern DECLSPEC SDL_Surface * SDLCALL SDL_ConvertSurface
0
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620 (SDL_Surface *src, SDL_PixelFormat *fmt, Uint32 flags);
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621
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622 /*
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623 * This performs a fast blit from the source surface to the destination
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624 * surface. It assumes that the source and destination rectangles are
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625 * the same size. If either 'srcrect' or 'dstrect' are NULL, the entire
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626 * surface (src or dst) is copied. The final blit rectangles are saved
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627 * in 'srcrect' and 'dstrect' after all clipping is performed.
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parents:
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628 * If the blit is successful, it returns 0, otherwise it returns -1.
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629 *
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630 * The blit function should not be called on a locked surface.
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631 *
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632 * The blit semantics for surfaces with and without alpha and colorkey
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633 * are defined as follows:
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634 *
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635 * RGBA->RGB:
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636 * SDL_SRCALPHA set:
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637 * alpha-blend (using alpha-channel).
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parents:
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638 * SDL_SRCCOLORKEY ignored.
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parents:
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639 * SDL_SRCALPHA not set:
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parents:
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640 * copy RGB.
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parents:
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641 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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parents:
diff changeset
642 * RGB values of the source colour key, ignoring alpha in the
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parents:
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643 * comparison.
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diff changeset
644 *
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diff changeset
645 * RGB->RGBA:
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646 * SDL_SRCALPHA set:
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647 * alpha-blend (using the source per-surface alpha value);
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diff changeset
648 * set destination alpha to opaque.
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649 * SDL_SRCALPHA not set:
431
41cadcba32e8 Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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diff changeset
650 * copy RGB, set destination alpha to source per-surface alpha value.
0
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651 * both:
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parents:
diff changeset
652 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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parents:
diff changeset
653 * source colour key.
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diff changeset
654 *
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655 * RGBA->RGBA:
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656 * SDL_SRCALPHA set:
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657 * alpha-blend (using the source alpha channel) the RGB values;
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parents:
diff changeset
658 * leave destination alpha untouched. [Note: is this correct?]
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parents:
diff changeset
659 * SDL_SRCCOLORKEY ignored.
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parents:
diff changeset
660 * SDL_SRCALPHA not set:
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diff changeset
661 * copy all of RGBA to the destination.
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662 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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parents:
diff changeset
663 * RGB values of the source colour key, ignoring alpha in the
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parents:
diff changeset
664 * comparison.
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parents:
diff changeset
665 *
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666 * RGB->RGB:
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parents:
diff changeset
667 * SDL_SRCALPHA set:
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parents:
diff changeset
668 * alpha-blend (using the source per-surface alpha value).
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parents:
diff changeset
669 * SDL_SRCALPHA not set:
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parents:
diff changeset
670 * copy RGB.
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parents:
diff changeset
671 * both:
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parents:
diff changeset
672 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
74212992fb08 Initial revision
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parents:
diff changeset
673 * source colour key.
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parents:
diff changeset
674 *
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parents:
diff changeset
675 * If either of the surfaces were in video memory, and the blit returns -2,
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parents:
diff changeset
676 * the video memory was lost, so it should be reloaded with artwork and
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parents:
diff changeset
677 * re-blitted:
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parents:
diff changeset
678 while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
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parents:
diff changeset
679 while ( SDL_LockSurface(image) < 0 )
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parents:
diff changeset
680 Sleep(10);
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parents:
diff changeset
681 -- Write image pixels to image->pixels --
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parents:
diff changeset
682 SDL_UnlockSurface(image);
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diff changeset
683 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
684 * This happens under DirectX 5.0 when the system switches away from your
74212992fb08 Initial revision
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parents:
diff changeset
685 * fullscreen application. The lock will also fail until you have access
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
686 * to the video memory again.
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parents:
diff changeset
687 */
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parents:
diff changeset
688 /* You should call SDL_BlitSurface() unless you know exactly how SDL
74212992fb08 Initial revision
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parents:
diff changeset
689 blitting works internally and how to use the other blit functions.
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parents:
diff changeset
690 */
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parents:
diff changeset
691 #define SDL_BlitSurface SDL_UpperBlit
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parents:
diff changeset
692
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parents:
diff changeset
693 /* This is the public blit function, SDL_BlitSurface(), and it performs
74212992fb08 Initial revision
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parents:
diff changeset
694 rectangle validation and clipping before passing it to SDL_LowerBlit()
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parents:
diff changeset
695 */
337
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diff changeset
696 extern DECLSPEC int SDLCALL SDL_UpperBlit
0
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parents:
diff changeset
697 (SDL_Surface *src, SDL_Rect *srcrect,
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parents:
diff changeset
698 SDL_Surface *dst, SDL_Rect *dstrect);
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parents:
diff changeset
699 /* This is a semi-private blit function and it performs low-level surface
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parents:
diff changeset
700 blitting only.
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diff changeset
701 */
337
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diff changeset
702 extern DECLSPEC int SDLCALL SDL_LowerBlit
0
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parents:
diff changeset
703 (SDL_Surface *src, SDL_Rect *srcrect,
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parents:
diff changeset
704 SDL_Surface *dst, SDL_Rect *dstrect);
74212992fb08 Initial revision
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parents:
diff changeset
705
74212992fb08 Initial revision
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parents:
diff changeset
706 /*
74212992fb08 Initial revision
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parents:
diff changeset
707 * This function performs a fast fill of the given rectangle with 'color'
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
708 * The given rectangle is clipped to the destination surface clip area
74212992fb08 Initial revision
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parents:
diff changeset
709 * and the final fill rectangle is saved in the passed in pointer.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
710 * If 'dstrect' is NULL, the whole surface will be filled with 'color'
74212992fb08 Initial revision
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parents:
diff changeset
711 * The color should be a pixel of the format used by the surface, and
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
712 * can be generated by the SDL_MapRGB() function.
74212992fb08 Initial revision
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parents:
diff changeset
713 * This function returns 0 on success, or -1 on error.
74212992fb08 Initial revision
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parents:
diff changeset
714 */
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diff changeset
715 extern DECLSPEC int SDLCALL SDL_FillRect
0
74212992fb08 Initial revision
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parents:
diff changeset
716 (SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color);
74212992fb08 Initial revision
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parents:
diff changeset
717
74212992fb08 Initial revision
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parents:
diff changeset
718 /*
74212992fb08 Initial revision
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parents:
diff changeset
719 * This function takes a surface and copies it to a new surface of the
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
720 * pixel format and colors of the video framebuffer, suitable for fast
74212992fb08 Initial revision
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parents:
diff changeset
721 * blitting onto the display surface. It calls SDL_ConvertSurface()
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
722 *
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
723 * If you want to take advantage of hardware colorkey or alpha blit
74212992fb08 Initial revision
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parents:
diff changeset
724 * acceleration, you should set the colorkey and alpha value before
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
725 * calling this function.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
726 *
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
727 * If the conversion fails or runs out of memory, it returns NULL
74212992fb08 Initial revision
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parents:
diff changeset
728 */
337
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diff changeset
729 extern DECLSPEC SDL_Surface * SDLCALL SDL_DisplayFormat(SDL_Surface *surface);
0
74212992fb08 Initial revision
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parents:
diff changeset
730
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
731 /*
74212992fb08 Initial revision
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parents:
diff changeset
732 * This function takes a surface and copies it to a new surface of the
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
733 * pixel format and colors of the video framebuffer (if possible),
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
734 * suitable for fast alpha blitting onto the display surface.
74212992fb08 Initial revision
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parents:
diff changeset
735 * The new surface will always have an alpha channel.
74212992fb08 Initial revision
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parents:
diff changeset
736 *
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
737 * If you want to take advantage of hardware colorkey or alpha blit
74212992fb08 Initial revision
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parents:
diff changeset
738 * acceleration, you should set the colorkey and alpha value before
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
739 * calling this function.
74212992fb08 Initial revision
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parents:
diff changeset
740 *
74212992fb08 Initial revision
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parents:
diff changeset
741 * If the conversion fails or runs out of memory, it returns NULL
74212992fb08 Initial revision
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parents:
diff changeset
742 */
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diff changeset
743 extern DECLSPEC SDL_Surface * SDLCALL SDL_DisplayFormatAlpha(SDL_Surface *surface);
0
74212992fb08 Initial revision
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parents:
diff changeset
744
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
745
74212992fb08 Initial revision
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parents:
diff changeset
746 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
74212992fb08 Initial revision
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parents:
diff changeset
747 /* YUV video surface overlay functions */
74212992fb08 Initial revision
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parents:
diff changeset
748 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
74212992fb08 Initial revision
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parents:
diff changeset
749
74212992fb08 Initial revision
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parents:
diff changeset
750 /* This function creates a video output overlay
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
751 Calling the returned surface an overlay is something of a misnomer because
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
752 the contents of the display surface underneath the area where the overlay
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
753 is shown is undefined - it may be overwritten with the converted YUV data.
74212992fb08 Initial revision
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parents:
diff changeset
754 */
337
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diff changeset
755 extern DECLSPEC SDL_Overlay * SDLCALL SDL_CreateYUVOverlay(int width, int height,
0
74212992fb08 Initial revision
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parents:
diff changeset
756 Uint32 format, SDL_Surface *display);
74212992fb08 Initial revision
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parents:
diff changeset
757
74212992fb08 Initial revision
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parents:
diff changeset
758 /* Lock an overlay for direct access, and unlock it when you are done */
337
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diff changeset
759 extern DECLSPEC int SDLCALL SDL_LockYUVOverlay(SDL_Overlay *overlay);
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diff changeset
760 extern DECLSPEC void SDLCALL SDL_UnlockYUVOverlay(SDL_Overlay *overlay);
0
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parents:
diff changeset
761
74212992fb08 Initial revision
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parents:
diff changeset
762 /* Blit a video overlay to the display surface.
74212992fb08 Initial revision
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parents:
diff changeset
763 The contents of the video surface underneath the blit destination are
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
764 not defined.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
765 The width and height of the destination rectangle may be different from
74212992fb08 Initial revision
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parents:
diff changeset
766 that of the overlay, but currently only 2x scaling is supported.
74212992fb08 Initial revision
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parents:
diff changeset
767 */
337
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diff changeset
768 extern DECLSPEC int SDLCALL SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect);
0
74212992fb08 Initial revision
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parents:
diff changeset
769
74212992fb08 Initial revision
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parents:
diff changeset
770 /* Free a video overlay */
337
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diff changeset
771 extern DECLSPEC void SDLCALL SDL_FreeYUVOverlay(SDL_Overlay *overlay);
0
74212992fb08 Initial revision
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parents:
diff changeset
772
74212992fb08 Initial revision
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parents:
diff changeset
773
74212992fb08 Initial revision
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parents:
diff changeset
774 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
74212992fb08 Initial revision
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parents:
diff changeset
775 /* OpenGL support functions. */
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776 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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777
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778 /*
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779 * Dynamically load an OpenGL library, or the default one if path is NULL
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780 *
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781 * If you do this, you need to retrieve all of the GL functions used in
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782 * your program from the dynamic library using SDL_GL_GetProcAddress().
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783 */
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784 extern DECLSPEC int SDLCALL SDL_GL_LoadLibrary(const char *path);
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785
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786 /*
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787 * Get the address of a GL function
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788 */
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789 extern DECLSPEC void * SDLCALL SDL_GL_GetProcAddress(const char* proc);
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790
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791 /*
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792 * Set an attribute of the OpenGL subsystem before intialization.
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793 */
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794 extern DECLSPEC int SDLCALL SDL_GL_SetAttribute(SDL_GLattr attr, int value);
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795
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796 /*
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797 * Get an attribute of the OpenGL subsystem from the windowing
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798 * interface, such as glX. This is of course different from getting
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799 * the values from SDL's internal OpenGL subsystem, which only
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800 * stores the values you request before initialization.
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801 *
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802 * Developers should track the values they pass into SDL_GL_SetAttribute
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803 * themselves if they want to retrieve these values.
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804 */
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805 extern DECLSPEC int SDLCALL SDL_GL_GetAttribute(SDL_GLattr attr, int* value);
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806
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807 /*
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808 * Swap the OpenGL buffers, if double-buffering is supported.
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809 */
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810 extern DECLSPEC void SDLCALL SDL_GL_SwapBuffers(void);
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811
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812 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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813 /* These functions allow interaction with the window manager, if any. */
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814 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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815
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816 /*
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4d005dfbb7f5 Fixed bug #139
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817 * Sets/Gets the title and icon text of the display window (UTF-8 encoded)
0
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818 */
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819 extern DECLSPEC void SDLCALL SDL_WM_SetCaption(const char *title, const char *icon);
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820 extern DECLSPEC void SDLCALL SDL_WM_GetCaption(char **title, char **icon);
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821
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822 /*
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823 * Sets the icon for the display window.
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824 * This function must be called before the first call to SDL_SetVideoMode().
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825 * It takes an icon surface, and a mask in MSB format.
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826 * If 'mask' is NULL, the entire icon surface will be used as the icon.
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827 */
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828 extern DECLSPEC void SDLCALL SDL_WM_SetIcon(SDL_Surface *icon, Uint8 *mask);
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829
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830 /*
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831 * This function iconifies the window, and returns 1 if it succeeded.
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832 * If the function succeeds, it generates an SDL_APPACTIVE loss event.
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833 * This function is a noop and returns 0 in non-windowed environments.
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834 */
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835 extern DECLSPEC int SDLCALL SDL_WM_IconifyWindow(void);
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836
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837 /*
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838 * Toggle fullscreen mode without changing the contents of the screen.
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839 * If the display surface does not require locking before accessing
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840 * the pixel information, then the memory pointers will not change.
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841 *
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842 * If this function was able to toggle fullscreen mode (change from
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843 * running in a window to fullscreen, or vice-versa), it will return 1.
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844 * If it is not implemented, or fails, it returns 0.
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845 *
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846 * The next call to SDL_SetVideoMode() will set the mode fullscreen
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847 * attribute based on the flags parameter - if SDL_FULLSCREEN is not
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848 * set, then the display will be windowed by default where supported.
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849 *
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850 * This is currently only implemented in the X11 video driver.
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851 */
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852 extern DECLSPEC int SDLCALL SDL_WM_ToggleFullScreen(SDL_Surface *surface);
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853
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854 /*
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855 * This function allows you to set and query the input grab state of
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856 * the application. It returns the new input grab state.
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857 */
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858 typedef enum {
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859 SDL_GRAB_QUERY = -1,
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860 SDL_GRAB_OFF = 0,
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861 SDL_GRAB_ON = 1,
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862 SDL_GRAB_FULLSCREEN /* Used internally */
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863 } SDL_GrabMode;
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864 /*
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865 * Grabbing means that the mouse is confined to the application window,
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866 * and nearly all keyboard input is passed directly to the application,
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867 * and not interpreted by a window manager, if any.
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868 */
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869 extern DECLSPEC SDL_GrabMode SDLCALL SDL_WM_GrabInput(SDL_GrabMode mode);
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870
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871 /* Not in public API at the moment - do not use! */
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872 extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
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873 SDL_Surface *dst, SDL_Rect *dstrect);
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874
0
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875 /* Ends C function definitions when using C++ */
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876 #ifdef __cplusplus
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877 }
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878 #endif
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879 #include "close_code.h"
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880
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881 #endif /* _SDL_video_h */