annotate src/video/wincommon/SDL_wingl.c @ 297:f6ffac90895c

Updated copyright information for 2002
author Sam Lantinga <slouken@libsdl.org>
date Wed, 06 Mar 2002 11:23:08 +0000
parents e8157fcb3114
children 13fc64213765
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, 1998, 1999, 2000, 2001, 2002 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@libsdl.org
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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 /* WGL implementation of SDL OpenGL support */
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29
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30 #include <windows.h>
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31
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32 #include "SDL_error.h"
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33 #include "SDL_lowvideo.h"
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34 #include "SDL_wingl_c.h"
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35
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36 #ifdef HAVE_OPENGL
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37 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL"
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38 #endif
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39
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40
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41 int WIN_GL_SetupWindow(_THIS)
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42 {
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43 int retval;
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44 #ifdef HAVE_OPENGL
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45 int pixel_format;
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46
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47 /* load the gl driver from a default path */
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48 if ( ! this->gl_config.driver_loaded ) {
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49 /* no driver has been loaded, use default (ourselves) */
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50 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) {
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51 return(-1);
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52 }
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53 }
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54
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55 /* Get the window device context for our OpenGL drawing */
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56 GL_hdc = GetDC(SDL_Window);
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57 if ( GL_hdc == NULL ) {
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58 SDL_SetError("Unable to get DC for SDL_Window");
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59 return(-1);
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60 }
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61
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62 /* Set up the pixel format descriptor with our needed format */
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63 memset(&GL_pfd, 0, sizeof(GL_pfd));
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64 GL_pfd.nSize = sizeof(GL_pfd);
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65 GL_pfd.nVersion = 1;
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66 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL);
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67 if ( this->gl_config.double_buffer ) {
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68 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER;
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69 }
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70 GL_pfd.iPixelType = PFD_TYPE_RGBA;
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71 GL_pfd.cColorBits = this->gl_config.buffer_size;
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72 GL_pfd.cRedBits = this->gl_config.red_size;
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73 GL_pfd.cGreenBits = this->gl_config.green_size;
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74 GL_pfd.cBlueBits = this->gl_config.blue_size;
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75 GL_pfd.cAlphaBits = this->gl_config.alpha_size;
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76 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size;
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77 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size;
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78 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size;
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79 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size;
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80 GL_pfd.cAccumBits =
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81 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits +
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82 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits);
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83 GL_pfd.cDepthBits = this->gl_config.depth_size;
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84 GL_pfd.cStencilBits = this->gl_config.stencil_size;
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85
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86 /* Choose and set the closest available pixel format */
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87 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd);
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88 if ( !pixel_format ) {
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89 SDL_SetError("No matching GL pixel format available");
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90 return(-1);
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91 }
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92 if( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) {
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93 SDL_SetError("Unable to set HDC pixel format");
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94 return(-1);
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95 }
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96 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd);
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97
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98 GL_hrc = this->gl_data->wglCreateContext(GL_hdc);
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99 if( GL_hrc == NULL ) {
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100 SDL_SetError("Unable to create GL context");
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101 return(-1);
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102 }
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103 gl_active = 1;
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104 #else
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105 SDL_SetError("WIN driver not configured with OpenGL");
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106 #endif
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107 if ( gl_active ) {
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108 retval = 0;
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109 } else {
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110 retval = -1;
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111 }
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112 return(retval);
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113 }
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114
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115 void WIN_GL_ShutDown(_THIS)
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116 {
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117 #ifdef HAVE_OPENGL
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118 /* Clean up OpenGL */
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119 if ( GL_hrc ) {
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120 this->gl_data->wglMakeCurrent(NULL, NULL);
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121 this->gl_data->wglDeleteContext(GL_hrc);
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122 GL_hrc = NULL;
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123 }
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124 if ( GL_hdc ) {
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125 ReleaseDC(SDL_Window, GL_hdc);
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126 GL_hdc = NULL;
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127 }
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128 gl_active = 0;
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129
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130 WIN_GL_UnloadLibrary(this);
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131 #endif /* HAVE_OPENGL */
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132 }
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133
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134 #ifdef HAVE_OPENGL
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135
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136 /* Make the current context active */
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137 int WIN_GL_MakeCurrent(_THIS)
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138 {
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139 int retval;
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140
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141 retval = 0;
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142 if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) {
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143 SDL_SetError("Unable to make GL context current");
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144 retval = -1;
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145 }
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146 return(retval);
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147 }
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148
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149 /* Get attribute data from glX. */
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150 int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
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151 {
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152 int retval;
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153
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154 retval = 0;
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155 switch( attrib ) {
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156 case SDL_GL_RED_SIZE:
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157 *value = GL_pfd.cRedBits;
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158 break;
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159 case SDL_GL_GREEN_SIZE:
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160 *value = GL_pfd.cGreenBits;
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161 break;
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162 case SDL_GL_BLUE_SIZE:
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163 *value = GL_pfd.cBlueBits;
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164 break;
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165 case SDL_GL_ALPHA_SIZE:
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166 *value = GL_pfd.cAlphaBits;
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167 break;
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168 case SDL_GL_DOUBLEBUFFER:
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169 if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) {
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170 *value = 1;
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171 } else {
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172 *value = 0;
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173 }
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174 break;
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175 case SDL_GL_BUFFER_SIZE:
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176 *value = GL_pfd.cColorBits;
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177 break;
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178 case SDL_GL_DEPTH_SIZE:
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179 *value = GL_pfd.cDepthBits;
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180 break;
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181 case SDL_GL_STENCIL_SIZE:
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182 *value = GL_pfd.cStencilBits;
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183 break;
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184 case SDL_GL_ACCUM_RED_SIZE:
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185 *value = GL_pfd.cAccumRedBits;
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186 break;
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187 case SDL_GL_ACCUM_GREEN_SIZE:
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188 *value = GL_pfd.cAccumGreenBits;
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189 break;
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190 case SDL_GL_ACCUM_BLUE_SIZE:
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191 *value = GL_pfd.cAccumBlueBits;
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192 break;
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193 case SDL_GL_ACCUM_ALPHA_SIZE:
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194 *value = GL_pfd.cAccumAlphaBits;
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195 break;
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196 default:
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197 retval = -1;
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198 break;
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199 }
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200 return retval;
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201 }
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202
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203 void WIN_GL_SwapBuffers(_THIS)
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204 {
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205 SwapBuffers(GL_hdc);
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206 }
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207
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208 #endif /* HAVE_OPENGL */
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209
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210 #ifdef HAVE_OPENGL
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211
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212 void WIN_GL_UnloadLibrary(_THIS)
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213 {
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214 if ( this->gl_config.driver_loaded ) {
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215 FreeLibrary((HMODULE)this->gl_config.dll_handle);
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216
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217 this->gl_data->wglGetProcAddress = NULL;
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218 this->gl_data->wglCreateContext = NULL;
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219 this->gl_data->wglDeleteContext = NULL;
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220 this->gl_data->wglMakeCurrent = NULL;
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parents:
diff changeset
221
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diff changeset
222 this->gl_config.dll_handle = NULL;
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diff changeset
223 this->gl_config.driver_loaded = 0;
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parents:
diff changeset
224 }
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parents:
diff changeset
225 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
226
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parents:
diff changeset
227 /* Passing a NULL path means load pointers from the application */
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diff changeset
228 int WIN_GL_LoadLibrary(_THIS, const char* path)
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diff changeset
229 {
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diff changeset
230 HMODULE handle;
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parents:
diff changeset
231
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parents:
diff changeset
232 if ( gl_active ) {
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parents:
diff changeset
233 SDL_SetError("OpenGL context already created");
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parents:
diff changeset
234 return -1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
235 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
236
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 if ( path == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 path = DEFAULT_GL_DRIVER_PATH;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 handle = LoadLibrary(path);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 if ( handle == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 SDL_SetError("Could not load OpenGL library");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 return -1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 /* Unload the old driver and reset the pointers */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247 WIN_GL_UnloadLibrary(this);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
248
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
249 /* Load new function pointers */
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parents:
diff changeset
250 this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *))
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
251 GetProcAddress(handle, "wglGetProcAddress");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC))
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253 GetProcAddress(handle, "wglCreateContext");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
254 this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC))
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 GetProcAddress(handle, "wglDeleteContext");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256 this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC))
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 GetProcAddress(handle, "wglMakeCurrent");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 if ( (this->gl_data->wglGetProcAddress == NULL) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 (this->gl_data->wglCreateContext == NULL) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 (this->gl_data->wglDeleteContext == NULL) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 (this->gl_data->wglMakeCurrent == NULL) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 SDL_SetError("Could not retrieve OpenGL functions");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 FreeLibrary(handle);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 this->gl_config.dll_handle = handle;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 strcpy(this->gl_config.driver_path, path);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 this->gl_config.driver_loaded = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 return 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 void *WIN_GL_GetProcAddress(_THIS, const char* proc)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 void *func;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 /* This is to pick up extensions */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 func = this->gl_data->wglGetProcAddress(proc);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 if ( ! func ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 /* This is probably a normal GL function */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 func = GetProcAddress(this->gl_config.dll_handle, proc);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 return func;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 #endif /* HAVE_OPENGL */