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annotate src/video/cybergfx/SDL_cgxgl.c @ 1554:0ca607a5d173

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Fixed bug #84 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 12:04:40 +0000
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children 782fd950bd46 c121d94672cb
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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 /* StormMesa implementation of SDL OpenGL support */
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25
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26 #include "SDL_cgxgl_c.h"
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27 #include "SDL_cgxvideo.h"
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28
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29 #if SDL_VIDEO_OPENGL
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30 AmigaMesaContext glcont=NULL;
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31 #endif
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32
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33 /* Init OpenGL */
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34 int CGX_GL_Init(_THIS)
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35 {
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36 #if SDL_VIDEO_OPENGL
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37 int i = 0;
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38 struct TagItem attributes [ 14 ]; /* 14 should be more than enough :) */
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39 struct Window *win = (struct Window *)SDL_Window;
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40
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41 // default config. Always used...
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42 attributes[i].ti_Tag = AMA_Window; attributes[i++].ti_Data = (unsigned long)win;
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43 attributes[i].ti_Tag = AMA_Left; attributes[i++].ti_Data = 0;
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44 attributes[i].ti_Tag = AMA_Bottom; attributes[i++].ti_Data = 0;
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45 attributes[i].ti_Tag = AMA_Width; attributes[i++].ti_Data = win->Width-win->BorderLeft-win->BorderRight;
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46 attributes[i].ti_Tag = AMA_Height; attributes[i++].ti_Data = win->Height-win->BorderBottom-win->BorderTop;
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47 attributes[i].ti_Tag = AMA_DirectRender; attributes[i++].ti_Data = GL_TRUE;
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48
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49 // double buffer ?
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50 attributes[i].ti_Tag = AMA_DoubleBuf;
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51 if ( this->gl_config.double_buffer ) {
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52 attributes[i++].ti_Data = GL_TRUE;
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53 }
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54 else {
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55 attributes[i++].ti_Data = GL_FALSE;
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56 }
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57 // RGB(A) Mode ?
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58 attributes[i].ti_Tag = AMA_RGBMode;
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59 if ( this->gl_config.red_size != 0 &&
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60 this->gl_config.blue_size != 0 &&
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61 this->gl_config.green_size != 0 ) {
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62 attributes[i++].ti_Data = GL_TRUE;
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63 }
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64 else {
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65 attributes[i++].ti_Data = GL_FALSE;
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66 }
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67 // no depth buffer ?
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68 if ( this->gl_config.depth_size == 0 ) {
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69 attributes[i].ti_Tag = AMA_NoDepth;
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70 attributes[i++].ti_Data = GL_TRUE;
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71 }
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72 // no stencil buffer ?
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73 if ( this->gl_config.stencil_size == 0 ) {
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74 attributes[i].ti_Tag = AMA_NoStencil;
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75 attributes[i++].ti_Data = GL_TRUE;
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76 }
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77 // no accum buffer ?
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78 if ( this->gl_config.accum_red_size != 0 &&
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79 this->gl_config.accum_blue_size != 0 &&
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80 this->gl_config.accum_green_size != 0 ) {
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81 attributes[i].ti_Tag = AMA_NoAccum;
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82 attributes[i++].ti_Data = GL_TRUE;
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83 }
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84 // done...
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85 attributes[i].ti_Tag = TAG_DONE;
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86
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87 glcont = AmigaMesaCreateContext(attributes);
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88 if ( glcont == NULL ) {
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89 SDL_SetError("Couldn't create OpenGL context");
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90 return(-1);
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91 }
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92 this->gl_data->gl_active = 1;
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93 this->gl_config.driver_loaded = 1;
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94
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95 return(0);
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96 #else
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97 SDL_SetError("OpenGL support not configured");
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98 return(-1);
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99 #endif
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100 }
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101
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102 /* Quit OpenGL */
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103 void CGX_GL_Quit(_THIS)
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104 {
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105 #if SDL_VIDEO_OPENGL
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106 if ( glcont != NULL ) {
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107 AmigaMesaDestroyContext(glcont);
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108 glcont = NULL;
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109 this->gl_data->gl_active = 0;
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110 this->gl_config.driver_loaded = 0;
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111 }
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112 #endif
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113 }
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114
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115 /* Attach context to another window */
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116 int CGX_GL_Update(_THIS)
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117 {
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118 #if SDL_VIDEO_OPENGL
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119 struct TagItem tags[2];
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120 struct Window *win = (struct Window*)SDL_Window;
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121 if(glcont == NULL) {
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122 return -1; //should never happen
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123 }
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124 tags[0].ti_Tag = AMA_Window;
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125 tags[0].ti_Data = (unsigned long)win;
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126 tags[1].ti_Tag = TAG_DONE;
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127 AmigaMesaSetRast(glcont, tags);
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128
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129 return 0;
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130 #else
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131 SDL_SetError("OpenGL support not configured");
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132 return -1;
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133 #endif
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134 }
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135
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136 #if SDL_VIDEO_OPENGL
0
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137
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138 /* Make the current context active */
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139 int CGX_GL_MakeCurrent(_THIS)
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140 {
255
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141 if(glcont == NULL)
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142 return -1;
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143
255
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144 AmigaMesaMakeCurrent(glcont, glcont->buffer);
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145 return 0;
0
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146 }
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147
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148 void CGX_GL_SwapBuffers(_THIS)
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149 {
255
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150 AmigaMesaSwapBuffers(glcont);
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151 }
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152
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153 int CGX_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) {
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154 GLenum mesa_attrib;
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155
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156 switch(attrib) {
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157 case SDL_GL_RED_SIZE:
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158 mesa_attrib = GL_RED_BITS;
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159 break;
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160 case SDL_GL_GREEN_SIZE:
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161 mesa_attrib = GL_GREEN_BITS;
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162 break;
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163 case SDL_GL_BLUE_SIZE:
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164 mesa_attrib = GL_BLUE_BITS;
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165 break;
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166 case SDL_GL_ALPHA_SIZE:
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167 mesa_attrib = GL_ALPHA_BITS;
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168 break;
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169 case SDL_GL_DOUBLEBUFFER:
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170 mesa_attrib = GL_DOUBLEBUFFER;
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171 break;
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172 case SDL_GL_DEPTH_SIZE:
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173 mesa_attrib = GL_DEPTH_BITS;
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174 break;
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175 case SDL_GL_STENCIL_SIZE:
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176 mesa_attrib = GL_STENCIL_BITS;
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177 break;
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178 case SDL_GL_ACCUM_RED_SIZE:
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179 mesa_attrib = GL_ACCUM_RED_BITS;
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180 break;
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181 case SDL_GL_ACCUM_GREEN_SIZE:
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182 mesa_attrib = GL_ACCUM_GREEN_BITS;
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183 break;
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184 case SDL_GL_ACCUM_BLUE_SIZE:
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185 mesa_attrib = GL_ACCUM_BLUE_BITS;
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186 break;
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187 case SDL_GL_ACCUM_ALPHA_SIZE:
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188 mesa_attrib = GL_ACCUM_ALPHA_BITS;
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189 break;
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190 default :
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191 return -1;
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192 }
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193
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194 AmigaMesaGetConfig(glcont->visual, mesa_attrib, value);
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195 return 0;
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196 }
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197
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198 void *CGX_GL_GetProcAddress(_THIS, const char *proc) {
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199 void *func = NULL;
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200 func = AmiGetGLProc(proc);
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201 return func;
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202 }
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203
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204 int CGX_GL_LoadLibrary(_THIS, const char *path) {
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205 /* Library is always open */
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206 this->gl_config.driver_loaded = 1;
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207
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208 return 0;
0
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209 }
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210
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211 #endif /* SDL_VIDEO_OPENGL */
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212