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0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 // #include <stdlib.h> /* For getenv() prototype */
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29 // #include <string.h>
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30
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31 #include "SDL_events_c.h"
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32 #include "SDL_error.h"
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33 #include "SDL_cgxvideo.h"
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34 #include "SDL_cgxgl_c.h"
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35
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36 #define DEFAULT_OPENGL "libGL.so.1"
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37
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38 /* return the preferred visual to use for openGL graphics */
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39 void *CGX_GL_GetVisual(_THIS)
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40 {
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41 #ifdef HAVE_OPENGL
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42 /* 64 seems nice. */
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43 int attribs[64];
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44 int i;
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45
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46 /* load the gl driver from a default path */
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47 if ( ! this->gl_config.driver_loaded ) {
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48 /* no driver has been loaded, use default (ourselves) */
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49 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
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50 return NULL;
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51 }
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52 }
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53
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54 /* See if we already have a window which we must use */
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55 if ( SDL_windowid ) {
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56 XWindowAttributes a;
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57 XVisualInfo vi_in;
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58 int out_count;
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59
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60 XGetWindowAttributes(SDL_Display, SDL_Window, &a);
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61 vi_in.screen = SDL_Screen;
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62 vi_in.visualid = XVisualIDFromVisual(a.visual);
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63 glx_visualinfo = XGetVisualInfo(SDL_Display,
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64 VisualScreenMask|VisualIDMask, &vi_in, &out_count);
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65 return glx_visualinfo;
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66 }
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67
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68 /* Setup our GLX attributes according to the gl_config. */
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69 i = 0;
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70 attribs[i++] = GLX_RGBA;
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71 attribs[i++] = GLX_RED_SIZE;
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72 attribs[i++] = this->gl_config.red_size;
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73 attribs[i++] = GLX_GREEN_SIZE;
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74 attribs[i++] = this->gl_config.green_size;
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75 attribs[i++] = GLX_BLUE_SIZE;
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76 attribs[i++] = this->gl_config.blue_size;
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77
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78 if( this->gl_config.alpha_size ) {
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79 attribs[i++] = GLX_ALPHA_SIZE;
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80 attribs[i++] = this->gl_config.alpha_size;
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81 }
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82
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83 if( this->gl_config.buffer_size ) {
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84 attribs[i++] = GLX_BUFFER_SIZE;
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85 attribs[i++] = this->gl_config.buffer_size;
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86 }
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87
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88 if( this->gl_config.double_buffer ) {
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89 attribs[i++] = GLX_DOUBLEBUFFER;
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90 }
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91
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92 attribs[i++] = GLX_DEPTH_SIZE;
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93 attribs[i++] = this->gl_config.depth_size;
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94
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95 if( this->gl_config.stencil_size ) {
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96 attribs[i++] = GLX_STENCIL_SIZE;
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97 attribs[i++] = this->gl_config.stencil_size;
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98 }
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99
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100 if( this->gl_config.accum_red_size ) {
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101 attribs[i++] = GLX_ACCUM_RED_SIZE;
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102 attribs[i++] = this->gl_config.accum_red_size;
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103 }
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104
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105 if( this->gl_config.accum_green_size ) {
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106 attribs[i++] = GLX_ACCUM_GREEN_SIZE;
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107 attribs[i++] = this->gl_config.accum_green_size;
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108 }
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109
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110 if( this->gl_config.accum_blue_size ) {
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111 attribs[i++] = GLX_ACCUM_BLUE_SIZE;
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112 attribs[i++] = this->gl_config.accum_blue_size;
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113 }
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114
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115 if( this->gl_config.accum_alpha_size ) {
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116 attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
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117 attribs[i++] = this->gl_config.accum_alpha_size;
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118 }
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119
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120 attribs[i++] = None;
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121
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122 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
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123 SDL_Screen, attribs);
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124 if( !glx_visualinfo ) {
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125 SDL_SetError( "Couldn't find matching GLX visual");
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126 return NULL;
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127 }
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128 return glx_visualinfo;
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129 #else
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130 SDL_SetError("CGX driver is not yet supporting OpenGL");
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131 return NULL;
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132 #endif
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133 }
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134
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135 int CGX_GL_CreateWindow(_THIS, int w, int h)
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136 {
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137 int retval;
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138 #ifdef HAVE_OPENGL
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139 XSetWindowAttributes attributes;
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140 unsigned long mask;
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141 unsigned long black;
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142
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143 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
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144 SDL_Screen))
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145 ? BlackPixel(SDL_Display, SDL_Screen) : 0;
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146 attributes.background_pixel = black;
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147 attributes.border_pixel = black;
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148 attributes.colormap = SDL_XColorMap;
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149 mask = CWBackPixel | CWBorderPixel | CWColormap;
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150
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151 SDL_Window = XCreateWindow(SDL_Display, WMwindow,
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152 0, 0, w, h, 0, glx_visualinfo->depth,
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153 InputOutput, glx_visualinfo->visual,
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154 mask, &attributes);
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155 if ( !SDL_Window ) {
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156 SDL_SetError("Could not create window");
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157 return -1;
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158 }
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159 retval = 0;
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160 #else
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161 SDL_SetError("CGX driver is not yet supporting OpenGL");
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162 retval = -1;
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163 #endif
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164 return(retval);
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165 }
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166
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167 int CGX_GL_CreateContext(_THIS)
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168 {
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169 int retval;
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170 #ifdef HAVE_OPENGL
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171 /* We do this to create a clean separation between X and GLX errors. */
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172 XSync( SDL_Display, False );
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173 glx_context = this->gl_data->glXCreateContext(GFX_Display,
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174 glx_visualinfo, NULL, True);
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175 XSync( GFX_Display, False );
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176
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177 if (glx_context == NULL) {
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178 SDL_SetError("Could not create GL context");
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179 return -1;
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180 }
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181
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182 gl_active = 1;
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183 #else
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184 SDL_SetError("CGX driver is not yet supporting OpenGL");
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185 #endif
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186 if ( gl_active ) {
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187 retval = 0;
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188 } else {
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189 retval = -1;
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190 }
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191 return(retval);
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192 }
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193
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194 void CGX_GL_Shutdown(_THIS)
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195 {
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196 #ifdef HAVE_OPENGL
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197 /* Clean up OpenGL */
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198 if( glx_context ) {
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199 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
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200
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201 if (glx_context != NULL)
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202 this->gl_data->glXDestroyContext(GFX_Display, glx_context);
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203
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204 if( this->gl_data->glXReleaseBuffersMESA ) {
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205 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
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206 }
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207 glx_context = NULL;
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208 }
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209 gl_active = 0;
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210 #endif /* HAVE_OPENGL */
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211 }
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212
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213 #ifdef HAVE_OPENGL
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214
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215 /* Make the current context active */
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216 int CGX_GL_MakeCurrent(_THIS)
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217 {
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218 int retval;
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219
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220 retval = 0;
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221 if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
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222 SDL_Window, glx_context) ) {
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223 SDL_SetError("Unable to make GL context current");
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224 retval = -1;
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225 }
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226 XSync( GFX_Display, False );
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227
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228 /* More Voodoo X server workarounds... Grr... */
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229 SDL_Lock_EventThread();
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230 X11_CheckDGAMouse(this);
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231 SDL_Unlock_EventThread();
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232
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233 return(retval);
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234 }
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235
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236 /* Get attribute data from glX. */
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237 int CGX_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
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238 {
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239 int retval;
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240 int glx_attrib = None;
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241
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242 switch( attrib ) {
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243 case SDL_GL_RED_SIZE:
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244 glx_attrib = GLX_RED_SIZE;
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245 break;
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246 case SDL_GL_GREEN_SIZE:
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247 glx_attrib = GLX_GREEN_SIZE;
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248 break;
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249 case SDL_GL_BLUE_SIZE:
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250 glx_attrib = GLX_BLUE_SIZE;
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251 break;
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252 case SDL_GL_ALPHA_SIZE:
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253 glx_attrib = GLX_ALPHA_SIZE;
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254 break;
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255 case SDL_GL_DOUBLEBUFFER:
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256 glx_attrib = GLX_DOUBLEBUFFER;
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257 break;
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258 case SDL_GL_BUFFER_SIZE:
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259 glx_attrib = GLX_BUFFER_SIZE;
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260 break;
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261 case SDL_GL_DEPTH_SIZE:
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262 glx_attrib = GLX_DEPTH_SIZE;
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263 break;
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264 case SDL_GL_STENCIL_SIZE:
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265 glx_attrib = GLX_STENCIL_SIZE;
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266 break;
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267 case SDL_GL_ACCUM_RED_SIZE:
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268 glx_attrib = GLX_ACCUM_RED_SIZE;
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269 break;
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270 case SDL_GL_ACCUM_GREEN_SIZE:
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271 glx_attrib = GLX_ACCUM_GREEN_SIZE;
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272 break;
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273 case SDL_GL_ACCUM_BLUE_SIZE:
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274 glx_attrib = GLX_ACCUM_BLUE_SIZE;
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275 break;
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276 case SDL_GL_ACCUM_ALPHA_SIZE:
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277 glx_attrib = GLX_ACCUM_ALPHA_SIZE;
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278 break;
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279 default:
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280 return(-1);
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281 }
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282
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283 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
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284
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285 return retval;
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286 }
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287
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288 void CGX_GL_SwapBuffers(_THIS)
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289 {
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290 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
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291 }
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292
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293 #endif /* HAVE_OPENGL */
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294
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295 void CGX_GL_UnloadLibrary(_THIS)
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296 {
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297 #ifdef HAVE_OPENGL
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298 if ( this->gl_config.driver_loaded ) {
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299 dlclose(this->gl_config.dll_handle);
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300
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301 this->gl_data->glXChooseVisual = NULL;
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302 this->gl_data->glXCreateContext = NULL;
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303 this->gl_data->glXDestroyContext = NULL;
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304 this->gl_data->glXMakeCurrent = NULL;
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305 this->gl_data->glXSwapBuffers = NULL;
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306
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307 this->gl_config.dll_handle = NULL;
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308 this->gl_config.driver_loaded = 0;
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309 }
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310 #endif
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311 }
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312
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313 #ifdef HAVE_OPENGL
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314
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315 /* Passing a NULL path means load pointers from the application */
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316 int CGX_GL_LoadLibrary(_THIS, const char* path)
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317 {
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318 void* handle;
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319 int dlopen_flags;
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320
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321 if ( gl_active ) {
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322 SDL_SetError("OpenGL context already created");
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323 return -1;
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324 }
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325
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326 #ifdef RTLD_GLOBAL
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327 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
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328 #else
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329 dlopen_flags = RTLD_LAZY;
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330 #endif
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331 handle = dlopen(path, dlopen_flags);
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332 /* Catch the case where the application isn't linked with GL */
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333 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) {
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334 dlclose(handle);
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335 path = getenv("SDL_VIDEO_GL_DRIVER");
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336 if ( path == NULL ) {
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337 path = DEFAULT_OPENGL;
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338 }
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339 handle = dlopen(path, dlopen_flags);
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340 }
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341 if ( handle == NULL ) {
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342 SDL_SetError("Could not load OpenGL library");
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343 return -1;
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344 }
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345
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346 /* Unload the old driver and reset the pointers */
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347 X11_GL_UnloadLibrary(this);
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348
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349 /* Load new function pointers */
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350 this->gl_data->glXChooseVisual = dlsym(handle, "glXChooseVisual");
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351 this->gl_data->glXCreateContext = dlsym(handle, "glXCreateContext");
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352 this->gl_data->glXDestroyContext = dlsym(handle, "glXDestroyContext");
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353 this->gl_data->glXMakeCurrent = dlsym(handle, "glXMakeCurrent");
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354 this->gl_data->glXSwapBuffers = dlsym(handle, "glXSwapBuffers");
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355 this->gl_data->glXGetConfig = dlsym(handle, "glXGetConfig");
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356 /* We don't compare below for this in case we're not using Mesa. */
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357 this->gl_data->glXReleaseBuffersMESA = dlsym( handle, "glXReleaseBuffersMESA" );
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358
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359 if ( (this->gl_data->glXChooseVisual == NULL) ||
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360 (this->gl_data->glXCreateContext == NULL) ||
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361 (this->gl_data->glXDestroyContext == NULL) ||
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362 (this->gl_data->glXMakeCurrent == NULL) ||
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363 (this->gl_data->glXSwapBuffers == NULL) ||
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364 (this->gl_data->glXGetConfig == NULL) ) {
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365 SDL_SetError("Could not retrieve OpenGL functions");
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366 return -1;
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367 }
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368
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369 this->gl_config.dll_handle = handle;
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370 this->gl_config.driver_loaded = 1;
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371 if ( path ) {
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372 strncpy(this->gl_config.driver_path, path,
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373 sizeof(this->gl_config.driver_path)-1);
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374 } else {
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375 strcpy(this->gl_config.driver_path, "");
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376 }
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377 return 0;
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378 }
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379
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380 void *CGX_GL_GetProcAddress(_THIS, const char* proc)
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381 {
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382 void* handle;
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383
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384 handle = this->gl_config.dll_handle;
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385
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386 return dlsym(handle, proc);
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387 }
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388
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389 #endif /* HAVE_OPENGL */
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