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annotate src/video/dummy/SDL_nullvideo.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 604d73db6802
children 19418e4422cb
rev   line source
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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.
1
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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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18
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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 /* Dummy SDL video driver implementation; this is just enough to make an
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24 * SDL-based application THINK it's got a working video driver, for
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25 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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26 * and also for use as a collection of stubs when porting SDL to a new
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27 * platform for which you haven't yet written a valid video driver.
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28 *
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29 * This is also a great way to determine bottlenecks: if you think that SDL
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30 * is a performance problem for a given platform, enable this driver, and
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31 * then see if your application runs faster without video overhead.
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32 *
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33 * Initial work by Ryan C. Gordon (icculus@linuxgames.com). A good portion
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34 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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35 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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36 */
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37
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38 #include "SDL_video.h"
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39 #include "SDL_mouse.h"
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40 #include "SDL_sysvideo.h"
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41 #include "SDL_pixels_c.h"
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42 #include "SDL_events_c.h"
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43
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44 #include "SDL_nullvideo.h"
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45 #include "SDL_nullevents_c.h"
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46 #include "SDL_nullmouse_c.h"
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47
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48 #define DUMMYVID_DRIVER_NAME "dummy"
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49
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50 /* Initialization/Query functions */
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51 static int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat);
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52 static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
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53 static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
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54 static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
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55 static void DUMMY_VideoQuit(_THIS);
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56
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57 /* Hardware surface functions */
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58 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
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59 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
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60 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
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61 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
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62
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63 /* etc. */
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64 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
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65
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66 /* DUMMY driver bootstrap functions */
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67
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68 static int DUMMY_Available(void)
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69 {
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70 const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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71 if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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72 return(1);
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73 }
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74
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75 return(0);
1
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76 }
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77
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78 static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
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79 {
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80 SDL_free(device->hidden);
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81 SDL_free(device);
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82 }
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83
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84 static SDL_VideoDevice *DUMMY_CreateDevice(int devindex)
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85 {
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86 SDL_VideoDevice *device;
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87
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88 /* Initialize all variables that we clean on shutdown */
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89 device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
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90 if ( device ) {
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91 SDL_memset(device, 0, (sizeof *device));
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92 device->hidden = (struct SDL_PrivateVideoData *)
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93 SDL_malloc((sizeof *device->hidden));
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94 }
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95 if ( (device == NULL) || (device->hidden == NULL) ) {
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96 SDL_OutOfMemory();
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97 if ( device ) {
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98 SDL_free(device);
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99 }
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100 return(0);
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101 }
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102 SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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103
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104 /* Set the function pointers */
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105 device->VideoInit = DUMMY_VideoInit;
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106 device->ListModes = DUMMY_ListModes;
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107 device->SetVideoMode = DUMMY_SetVideoMode;
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108 device->CreateYUVOverlay = NULL;
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109 device->SetColors = DUMMY_SetColors;
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110 device->UpdateRects = DUMMY_UpdateRects;
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111 device->VideoQuit = DUMMY_VideoQuit;
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112 device->AllocHWSurface = DUMMY_AllocHWSurface;
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113 device->CheckHWBlit = NULL;
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114 device->FillHWRect = NULL;
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115 device->SetHWColorKey = NULL;
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116 device->SetHWAlpha = NULL;
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117 device->LockHWSurface = DUMMY_LockHWSurface;
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118 device->UnlockHWSurface = DUMMY_UnlockHWSurface;
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119 device->FlipHWSurface = NULL;
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120 device->FreeHWSurface = DUMMY_FreeHWSurface;
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121 device->SetCaption = NULL;
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122 device->SetIcon = NULL;
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123 device->IconifyWindow = NULL;
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124 device->GrabInput = NULL;
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125 device->GetWMInfo = NULL;
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126 device->InitOSKeymap = DUMMY_InitOSKeymap;
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127 device->PumpEvents = DUMMY_PumpEvents;
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128
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129 device->free = DUMMY_DeleteDevice;
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130
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131 return device;
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132 }
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133
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134 VideoBootStrap DUMMY_bootstrap = {
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135 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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136 DUMMY_Available, DUMMY_CreateDevice
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137 };
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138
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139
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140 int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
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141 {
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142 /*
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143 fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
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144 */
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145
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146 /* Determine the screen depth (use default 8-bit depth) */
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147 /* we change this during the SDL_SetVideoMode implementation... */
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148 vformat->BitsPerPixel = 8;
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149 vformat->BytesPerPixel = 1;
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150
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151 /* We're done! */
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152 return(0);
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153 }
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154
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155 SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
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156 {
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157 return (SDL_Rect **) -1;
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158 }
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159
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160 SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
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161 int width, int height, int bpp, Uint32 flags)
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162 {
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163 if ( this->hidden->buffer ) {
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164 SDL_free( this->hidden->buffer );
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165 }
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166
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167 this->hidden->buffer = SDL_malloc(width * height * (bpp / 8));
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168 if ( ! this->hidden->buffer ) {
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169 SDL_SetError("Couldn't allocate buffer for requested mode");
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170 return(NULL);
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171 }
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172
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173 /* printf("Setting mode %dx%d\n", width, height); */
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174
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175 SDL_memset(this->hidden->buffer, 0, width * height * (bpp / 8));
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176
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177 /* Allocate the new pixel format for the screen */
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178 if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
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179 SDL_free(this->hidden->buffer);
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180 this->hidden->buffer = NULL;
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181 SDL_SetError("Couldn't allocate new pixel format for requested mode");
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182 return(NULL);
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183 }
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184
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185 /* Set up the new mode framebuffer */
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186 current->flags = flags & SDL_FULLSCREEN;
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187 this->hidden->w = current->w = width;
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188 this->hidden->h = current->h = height;
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189 current->pitch = current->w * (bpp / 8);
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190 current->pixels = this->hidden->buffer;
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191
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192 /* We're done */
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193 return(current);
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194 }
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195
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196 /* We don't actually allow hardware surfaces other than the main one */
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197 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
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198 {
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199 return(-1);
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200 }
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201 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
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202 {
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203 return;
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204 }
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205
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206 /* We need to wait for vertical retrace on page flipped displays */
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207 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
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208 {
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209 return(0);
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210 }
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211
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212 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
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213 {
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214 return;
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215 }
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216
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217 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
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218 {
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219 /* do nothing. */
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220 }
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221
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222 int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
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223 {
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224 /* do nothing of note. */
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225 return(1);
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226 }
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227
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228 /* Note: If we are terminated, this could be called in the middle of
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229 another SDL video routine -- notably UpdateRects.
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230 */
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231 void DUMMY_VideoQuit(_THIS)
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232 {
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233 if (this->screen->pixels != NULL)
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234 {
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235 SDL_free(this->screen->pixels);
1
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236 this->screen->pixels = NULL;
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237 }
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238 }