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annotate src/video/dummy/SDL_nullvideo.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents c439dad53df8
children 6e7ec5cb83c3
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.
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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 #include "SDL_config.h"
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23
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24 /* Dummy SDL video driver implementation; this is just enough to make an
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25 * SDL-based application THINK it's got a working video driver, for
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26 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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27 * and also for use as a collection of stubs when porting SDL to a new
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28 * platform for which you haven't yet written a valid video driver.
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29 *
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30 * This is also a great way to determine bottlenecks: if you think that SDL
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31 * is a performance problem for a given platform, enable this driver, and
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32 * then see if your application runs faster without video overhead.
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33 *
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34 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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35 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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36 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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37 */
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38
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39 #include "SDL_video.h"
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40 #include "SDL_mouse.h"
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41 #include "../SDL_sysvideo.h"
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42 #include "../SDL_pixels_c.h"
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43 #include "../../events/SDL_events_c.h"
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44
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45 #include "SDL_nullvideo.h"
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46 #include "SDL_nullevents_c.h"
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47 #include "SDL_nullmouse_c.h"
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48
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49 #define DUMMYVID_DRIVER_NAME "dummy"
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50
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51 /* Initialization/Query functions */
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52 static int DUMMY_VideoInit (_THIS);
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53 static int DUMMY_SetDisplayMode (_THIS, const SDL_DisplayMode * mode);
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54 static SDL_Surface *DUMMY_CreateWindowSurface (_THIS, SDL_Window * window);
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55 static void DUMMY_VideoQuit (_THIS);
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56
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57 /* DUMMY driver bootstrap functions */
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58
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59 static int
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60 DUMMY_Available (void)
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61 {
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62 const char *envr = SDL_getenv ("SDL_VIDEODRIVER");
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63 if ((envr) && (SDL_strcmp (envr, DUMMYVID_DRIVER_NAME) == 0)) {
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64 return (1);
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65 }
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66
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67 return (0);
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68 }
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69
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70 static void
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71 DUMMY_DeleteDevice (SDL_VideoDevice * device)
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72 {
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73 SDL_free (device->hidden);
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74 SDL_free (device);
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75 }
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76
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77 static SDL_VideoDevice *
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78 DUMMY_CreateDevice (int devindex)
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79 {
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80 SDL_VideoDevice *device;
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81
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82 /* Initialize all variables that we clean on shutdown */
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83 device = (SDL_VideoDevice *) SDL_malloc (sizeof (SDL_VideoDevice));
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84 if (device) {
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85 SDL_memset (device, 0, (sizeof *device));
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86 device->hidden = (struct SDL_PrivateVideoData *)
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87 SDL_malloc ((sizeof *device->hidden));
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88 }
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89 if ((device == NULL) || (device->hidden == NULL)) {
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90 SDL_OutOfMemory ();
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91 if (device) {
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92 SDL_free (device);
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93 }
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94 return (0);
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95 }
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96 SDL_memset (device->hidden, 0, (sizeof *device->hidden));
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97
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98 /* Set the function pointers */
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99 device->VideoInit = DUMMY_VideoInit;
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100 device->SetDisplayMode = DUMMY_SetDisplayMode;
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101 device->VideoQuit = DUMMY_VideoQuit;
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102 device->InitOSKeymap = DUMMY_InitOSKeymap;
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103 device->PumpEvents = DUMMY_PumpEvents;
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104
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105 device->free = DUMMY_DeleteDevice;
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106
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107 return device;
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108 }
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109
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110 VideoBootStrap DUMMY_bootstrap = {
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111 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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112 DUMMY_Available, DUMMY_CreateDevice
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113 };
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114
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115
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116 int
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117 DUMMY_VideoInit (_THIS)
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118 {
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119 SDL_AddBasicVideoDisplay (NULL);
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120
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121 /* We're done! */
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122 return 0;
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123 }
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124
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125 static int
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126 DUMMY_SetDisplayMode (_THIS, const SDL_DisplayMode * mode)
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127 {
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128 return 0;
1
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129 }
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130
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131 static SDL_Surface *
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132 DUMMY_CreateWindowSurface (_THIS, SDL_Window * window)
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133 {
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134 int bpp;
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135 Uint32 Rmask, Gmask, Bmask, Amask;
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136
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137 if (_this->hidden->buffer) {
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138 SDL_free (_this->hidden->buffer);
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139 }
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140
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141 _this->hidden->buffer =
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142 SDL_malloc (mode->w * mode->h * SDL_BYTESPERPIXEL (mode->format));
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143 if (!_this->hidden->buffer) {
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144 SDL_SetError ("Couldn't allocate buffer for requested mode");
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145 return (NULL);
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146 }
1
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147
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148 /* printf("Setting mode %dx%d\n", width, height); */
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149
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150 SDL_memset (_this->hidden->buffer, 0,
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151 mode->w * mode->h * SDL_BYTESPERPIXEL (mode->format));
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152
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153 /* Allocate the new pixel format for the screen */
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154 SDL_PixelFormatEnumToMasks (mode->format, &bpp, &Rmask, &Gmask, &Bmask,
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155 &Amask);
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156 if (!SDL_ReallocFormat (current, bpp, Rmask, Gmask, Bmask, Amask)) {
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157 SDL_free (_this->hidden->buffer);
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158 _this->hidden->buffer = NULL;
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159 SDL_SetError
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160 ("Couldn't allocate new pixel format for requested mode");
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161 return (NULL);
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162 }
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163
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164 /* Set up the new mode framebuffer */
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165 current->flags = flags & SDL_FULLSCREEN;
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166 _this->hidden->w = current->w = mode->w;
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167 _this->hidden->h = current->h = mode->h;
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168 current->pitch = current->w * SDL_BYTESPERPIXEL (mode->format);
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169 current->pixels = _this->hidden->buffer;
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170
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171 /* We're done */
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172 return (current);
1
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173 }
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174
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175 SDL_Surface *
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176 DUMMY_SetVideoMode (_THIS, SDL_Surface * current,
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177 const SDL_DisplayMode * mode, Uint32 flags)
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178 {
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179 int bpp;
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180 Uint32 Rmask, Gmask, Bmask, Amask;
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181
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182 if (_this->hidden->buffer) {
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183 SDL_free (_this->hidden->buffer);
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184 }
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185
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186 _this->hidden->buffer =
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187 SDL_malloc (mode->w * mode->h * SDL_BYTESPERPIXEL (mode->format));
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188 if (!_this->hidden->buffer) {
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189 SDL_SetError ("Couldn't allocate buffer for requested mode");
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190 return (NULL);
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191 }
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192
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193 /* printf("Setting mode %dx%d\n", width, height); */
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194
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195 SDL_memset (_this->hidden->buffer, 0,
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196 mode->w * mode->h * SDL_BYTESPERPIXEL (mode->format));
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197
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198 /* Allocate the new pixel format for the screen */
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199 SDL_PixelFormatEnumToMasks (mode->format, &bpp, &Rmask, &Gmask, &Bmask,
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200 &Amask);
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201 if (!SDL_ReallocFormat (current, bpp, Rmask, Gmask, Bmask, Amask)) {
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202 SDL_free (_this->hidden->buffer);
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203 _this->hidden->buffer = NULL;
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204 SDL_SetError
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205 ("Couldn't allocate new pixel format for requested mode");
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206 return (NULL);
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207 }
1
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208
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209 /* Set up the new mode framebuffer */
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210 current->flags = flags & SDL_FULLSCREEN;
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211 _this->hidden->w = current->w = mode->w;
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212 _this->hidden->h = current->h = mode->h;
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213 current->pitch = current->w * SDL_BYTESPERPIXEL (mode->format);
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214 current->pixels = _this->hidden->buffer;
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215
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216 /* We're done */
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217 return (current);
1
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218 }
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219
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220 /* Note: If we are terminated, this could be called in the middle of
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221 another SDL video routine -- notably UpdateRects.
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222 */
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223 void
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224 DUMMY_VideoQuit (_THIS)
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225 {
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226 if (_this->hidden->buffer) {
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227 SDL_free (_this->hidden->buffer);
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228 }
1
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229 }
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230
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231 /* vi: set ts=4 sw=4 expandtab: */