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annotate src/video/dummy/SDL_nullvideo.c @ 1555:780fd5b61df1

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Fixed bug #89 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:05:16 +0000
parents d910939febfa
children c439dad53df8
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@linuxgames.com). 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, SDL_PixelFormat *vformat);
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53 static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
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54 static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
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55 static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
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56 static void DUMMY_VideoQuit(_THIS);
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57
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58 /* Hardware surface functions */
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59 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
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60 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
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61 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
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62 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
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63
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64 /* etc. */
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65 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
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66
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67 /* DUMMY driver bootstrap functions */
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68
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69 static int DUMMY_Available(void)
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70 {
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71 const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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72 if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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73 return(1);
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74 }
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75
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76 return(0);
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77 }
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78
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79 static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
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80 {
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81 SDL_free(device->hidden);
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82 SDL_free(device);
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83 }
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84
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85 static SDL_VideoDevice *DUMMY_CreateDevice(int devindex)
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86 {
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87 SDL_VideoDevice *device;
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88
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89 /* Initialize all variables that we clean on shutdown */
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90 device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
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91 if ( device ) {
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92 SDL_memset(device, 0, (sizeof *device));
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93 device->hidden = (struct SDL_PrivateVideoData *)
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94 SDL_malloc((sizeof *device->hidden));
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95 }
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96 if ( (device == NULL) || (device->hidden == NULL) ) {
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97 SDL_OutOfMemory();
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98 if ( device ) {
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99 SDL_free(device);
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100 }
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101 return(0);
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102 }
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103 SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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104
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105 /* Set the function pointers */
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106 device->VideoInit = DUMMY_VideoInit;
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107 device->ListModes = DUMMY_ListModes;
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108 device->SetVideoMode = DUMMY_SetVideoMode;
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109 device->CreateYUVOverlay = NULL;
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110 device->SetColors = DUMMY_SetColors;
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111 device->UpdateRects = DUMMY_UpdateRects;
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112 device->VideoQuit = DUMMY_VideoQuit;
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113 device->AllocHWSurface = DUMMY_AllocHWSurface;
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114 device->CheckHWBlit = NULL;
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115 device->FillHWRect = NULL;
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116 device->SetHWColorKey = NULL;
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117 device->SetHWAlpha = NULL;
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118 device->LockHWSurface = DUMMY_LockHWSurface;
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119 device->UnlockHWSurface = DUMMY_UnlockHWSurface;
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120 device->FlipHWSurface = NULL;
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121 device->FreeHWSurface = DUMMY_FreeHWSurface;
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122 device->SetCaption = NULL;
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123 device->SetIcon = NULL;
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124 device->IconifyWindow = NULL;
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125 device->GrabInput = NULL;
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126 device->GetWMInfo = NULL;
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127 device->InitOSKeymap = DUMMY_InitOSKeymap;
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128 device->PumpEvents = DUMMY_PumpEvents;
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129
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130 device->free = DUMMY_DeleteDevice;
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131
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132 return device;
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133 }
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134
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135 VideoBootStrap DUMMY_bootstrap = {
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136 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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137 DUMMY_Available, DUMMY_CreateDevice
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138 };
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139
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140
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141 int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
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142 {
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143 /*
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144 fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
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145 */
1
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146
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147 /* Determine the screen depth (use default 8-bit depth) */
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148 /* we change this during the SDL_SetVideoMode implementation... */
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149 vformat->BitsPerPixel = 8;
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150 vformat->BytesPerPixel = 1;
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151
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152 /* We're done! */
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153 return(0);
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154 }
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155
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156 SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
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157 {
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158 return (SDL_Rect **) -1;
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159 }
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160
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161 SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
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162 int width, int height, int bpp, Uint32 flags)
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163 {
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164 if ( this->hidden->buffer ) {
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165 SDL_free( this->hidden->buffer );
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166 }
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167
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168 this->hidden->buffer = SDL_malloc(width * height * (bpp / 8));
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169 if ( ! this->hidden->buffer ) {
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170 SDL_SetError("Couldn't allocate buffer for requested mode");
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171 return(NULL);
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172 }
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173
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174 /* printf("Setting mode %dx%d\n", width, height); */
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175
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176 SDL_memset(this->hidden->buffer, 0, width * height * (bpp / 8));
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177
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178 /* Allocate the new pixel format for the screen */
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179 if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
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180 SDL_free(this->hidden->buffer);
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181 this->hidden->buffer = NULL;
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182 SDL_SetError("Couldn't allocate new pixel format for requested mode");
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183 return(NULL);
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184 }
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185
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186 /* Set up the new mode framebuffer */
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187 current->flags = flags & SDL_FULLSCREEN;
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188 this->hidden->w = current->w = width;
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189 this->hidden->h = current->h = height;
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190 current->pitch = current->w * (bpp / 8);
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191 current->pixels = this->hidden->buffer;
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192
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193 /* We're done */
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194 return(current);
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195 }
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196
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197 /* We don't actually allow hardware surfaces other than the main one */
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198 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
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199 {
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200 return(-1);
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201 }
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202 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
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203 {
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204 return;
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205 }
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206
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207 /* We need to wait for vertical retrace on page flipped displays */
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208 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
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209 {
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210 return(0);
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211 }
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212
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213 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
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214 {
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215 return;
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diff changeset
216 }
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diff changeset
217
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218 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
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219 {
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220 /* do nothing. */
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221 }
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222
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223 int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
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224 {
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225 /* do nothing of note. */
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226 return(1);
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227 }
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228
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229 /* Note: If we are terminated, this could be called in the middle of
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diff changeset
230 another SDL video routine -- notably UpdateRects.
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231 */
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232 void DUMMY_VideoQuit(_THIS)
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233 {
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234 if (this->screen->pixels != NULL)
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235 {
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236 SDL_free(this->screen->pixels);
1
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237 this->screen->pixels = NULL;
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238 }
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239 }