Mercurial > sdl-ios-xcode
annotate src/video/wincommon/SDL_wingl.c @ 373:c638fde8a824
Fixed setting OpenGL mode multiple times on Windows
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 19 May 2002 22:27:42 +0000 |
| parents | 13fc64213765 |
| children | 8a43e0cbf02f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* WGL implementation of SDL OpenGL support */ | |
| 29 | |
|
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30 #include "SDL_opengl.h" |
| 0 | 31 #include "SDL_error.h" |
| 32 #include "SDL_lowvideo.h" | |
| 33 #include "SDL_wingl_c.h" | |
| 34 | |
| 35 #ifdef HAVE_OPENGL | |
| 36 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL" | |
| 37 #endif | |
| 38 | |
|
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39 /* If setting the HDC fails, we may need to recreate the window (MSDN) */ |
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40 static int WIN_GL_ResetWindow(_THIS) |
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41 { |
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42 int status = 0; |
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43 int can_reset = 1; |
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44 |
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45 /* If we were passed a window, then we can't create a new one */ |
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46 if ( SDL_windowid ) { |
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47 can_reset = 0; |
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48 } |
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49 #ifndef _WIN32_WCE /* FIXME WinCE needs the UNICODE version of CreateWindow() */ |
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50 if ( can_reset ) { |
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51 /* Save the existing window attributes */ |
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52 LONG style; |
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53 RECT rect = { 0, 0, 0, 0 }; |
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54 style = GetWindowLong(SDL_Window, GWL_STYLE); |
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55 GetWindowRect(SDL_Window, &rect); |
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56 DestroyWindow(SDL_Window); |
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57 SDL_Window = CreateWindow(SDL_Appname, SDL_Appname, |
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58 style, |
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59 rect.left, rect.top, |
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60 (rect.right-rect.left)+1, |
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61 (rect.top-rect.bottom)+1, |
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62 NULL, NULL, SDL_Instance, NULL); |
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63 if ( SDL_Window ) { |
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64 this->SetCaption(this, this->wm_title, this->wm_icon); |
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65 } else { |
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66 SDL_SetError("Couldn't create window"); |
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67 status = -1; |
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68 } |
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69 } else |
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70 #endif /* !_WIN32_WCE */ |
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71 { |
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72 SDL_SetError("Unable to reset window for OpenGL context"); |
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73 status = -1; |
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74 } |
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75 return(status); |
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76 } |
| 0 | 77 |
| 78 int WIN_GL_SetupWindow(_THIS) | |
| 79 { | |
| 80 int retval; | |
| 81 #ifdef HAVE_OPENGL | |
|
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82 int i; |
| 0 | 83 int pixel_format; |
| 84 | |
| 85 /* load the gl driver from a default path */ | |
| 86 if ( ! this->gl_config.driver_loaded ) { | |
| 87 /* no driver has been loaded, use default (ourselves) */ | |
| 88 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) { | |
| 89 return(-1); | |
| 90 } | |
| 91 } | |
| 92 | |
|
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93 for ( i=0; ; ++i ) { |
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94 /* Get the window device context for our OpenGL drawing */ |
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95 GL_hdc = GetDC(SDL_Window); |
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96 if ( GL_hdc == NULL ) { |
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97 SDL_SetError("Unable to get DC for SDL_Window"); |
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98 return(-1); |
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99 } |
| 0 | 100 |
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101 /* Set up the pixel format descriptor with our needed format */ |
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102 memset(&GL_pfd, 0, sizeof(GL_pfd)); |
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103 GL_pfd.nSize = sizeof(GL_pfd); |
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104 GL_pfd.nVersion = 1; |
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105 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL); |
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106 if ( this->gl_config.double_buffer ) { |
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107 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER; |
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108 } |
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109 GL_pfd.iPixelType = PFD_TYPE_RGBA; |
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110 GL_pfd.cColorBits = this->gl_config.buffer_size; |
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111 GL_pfd.cRedBits = this->gl_config.red_size; |
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112 GL_pfd.cGreenBits = this->gl_config.green_size; |
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113 GL_pfd.cBlueBits = this->gl_config.blue_size; |
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114 GL_pfd.cAlphaBits = this->gl_config.alpha_size; |
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115 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size; |
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116 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size; |
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117 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size; |
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118 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size; |
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119 GL_pfd.cAccumBits = |
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120 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits + |
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121 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits); |
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122 GL_pfd.cDepthBits = this->gl_config.depth_size; |
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123 GL_pfd.cStencilBits = this->gl_config.stencil_size; |
| 0 | 124 |
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125 /* Choose and set the closest available pixel format */ |
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126 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd); |
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127 if ( !pixel_format ) { |
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128 SDL_SetError("No matching GL pixel format available"); |
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129 return(-1); |
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130 } |
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131 if( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) { |
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132 if ( i == 0 ) { |
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133 /* First time through, try resetting the window */ |
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134 if ( WIN_GL_ResetWindow(this) < 0 ) { |
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135 return(-1); |
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136 } |
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137 continue; |
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138 } |
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139 SDL_SetError("Unable to set HDC pixel format"); |
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140 return(-1); |
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141 } |
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142 /* We either succeeded or failed by this point */ |
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143 break; |
| 0 | 144 } |
| 145 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd); | |
| 146 | |
| 147 GL_hrc = this->gl_data->wglCreateContext(GL_hdc); | |
| 148 if( GL_hrc == NULL ) { | |
| 149 SDL_SetError("Unable to create GL context"); | |
| 150 return(-1); | |
| 151 } | |
| 152 gl_active = 1; | |
| 153 #else | |
| 154 SDL_SetError("WIN driver not configured with OpenGL"); | |
| 155 #endif | |
| 156 if ( gl_active ) { | |
| 157 retval = 0; | |
| 158 } else { | |
| 159 retval = -1; | |
| 160 } | |
| 161 return(retval); | |
| 162 } | |
| 163 | |
| 164 void WIN_GL_ShutDown(_THIS) | |
| 165 { | |
| 166 #ifdef HAVE_OPENGL | |
| 167 /* Clean up OpenGL */ | |
| 168 if ( GL_hrc ) { | |
| 169 this->gl_data->wglMakeCurrent(NULL, NULL); | |
| 170 this->gl_data->wglDeleteContext(GL_hrc); | |
| 171 GL_hrc = NULL; | |
| 172 } | |
| 173 if ( GL_hdc ) { | |
| 174 ReleaseDC(SDL_Window, GL_hdc); | |
| 175 GL_hdc = NULL; | |
| 176 } | |
| 177 gl_active = 0; | |
| 178 | |
| 179 WIN_GL_UnloadLibrary(this); | |
| 180 #endif /* HAVE_OPENGL */ | |
| 181 } | |
| 182 | |
| 183 #ifdef HAVE_OPENGL | |
| 184 | |
| 185 /* Make the current context active */ | |
| 186 int WIN_GL_MakeCurrent(_THIS) | |
| 187 { | |
| 188 int retval; | |
| 189 | |
| 190 retval = 0; | |
| 191 if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) { | |
| 192 SDL_SetError("Unable to make GL context current"); | |
| 193 retval = -1; | |
| 194 } | |
| 195 return(retval); | |
| 196 } | |
| 197 | |
| 198 /* Get attribute data from glX. */ | |
| 199 int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | |
| 200 { | |
| 201 int retval; | |
| 202 | |
| 203 retval = 0; | |
| 204 switch( attrib ) { | |
| 205 case SDL_GL_RED_SIZE: | |
| 206 *value = GL_pfd.cRedBits; | |
| 207 break; | |
| 208 case SDL_GL_GREEN_SIZE: | |
| 209 *value = GL_pfd.cGreenBits; | |
| 210 break; | |
| 211 case SDL_GL_BLUE_SIZE: | |
| 212 *value = GL_pfd.cBlueBits; | |
| 213 break; | |
| 214 case SDL_GL_ALPHA_SIZE: | |
| 215 *value = GL_pfd.cAlphaBits; | |
| 216 break; | |
| 217 case SDL_GL_DOUBLEBUFFER: | |
| 218 if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) { | |
| 219 *value = 1; | |
| 220 } else { | |
| 221 *value = 0; | |
| 222 } | |
| 223 break; | |
| 224 case SDL_GL_BUFFER_SIZE: | |
| 225 *value = GL_pfd.cColorBits; | |
| 226 break; | |
| 227 case SDL_GL_DEPTH_SIZE: | |
| 228 *value = GL_pfd.cDepthBits; | |
| 229 break; | |
| 230 case SDL_GL_STENCIL_SIZE: | |
| 231 *value = GL_pfd.cStencilBits; | |
| 232 break; | |
| 233 case SDL_GL_ACCUM_RED_SIZE: | |
| 234 *value = GL_pfd.cAccumRedBits; | |
| 235 break; | |
| 236 case SDL_GL_ACCUM_GREEN_SIZE: | |
| 237 *value = GL_pfd.cAccumGreenBits; | |
| 238 break; | |
| 239 case SDL_GL_ACCUM_BLUE_SIZE: | |
| 240 *value = GL_pfd.cAccumBlueBits; | |
| 241 break; | |
| 242 case SDL_GL_ACCUM_ALPHA_SIZE: | |
| 243 *value = GL_pfd.cAccumAlphaBits; | |
| 244 break; | |
| 245 default: | |
| 246 retval = -1; | |
| 247 break; | |
| 248 } | |
| 249 return retval; | |
| 250 } | |
| 251 | |
| 252 void WIN_GL_SwapBuffers(_THIS) | |
| 253 { | |
| 254 SwapBuffers(GL_hdc); | |
| 255 } | |
| 256 | |
| 257 #endif /* HAVE_OPENGL */ | |
| 258 | |
| 259 #ifdef HAVE_OPENGL | |
| 260 | |
| 261 void WIN_GL_UnloadLibrary(_THIS) | |
| 262 { | |
| 263 if ( this->gl_config.driver_loaded ) { | |
| 264 FreeLibrary((HMODULE)this->gl_config.dll_handle); | |
| 265 | |
| 266 this->gl_data->wglGetProcAddress = NULL; | |
| 267 this->gl_data->wglCreateContext = NULL; | |
| 268 this->gl_data->wglDeleteContext = NULL; | |
| 269 this->gl_data->wglMakeCurrent = NULL; | |
| 270 | |
| 271 this->gl_config.dll_handle = NULL; | |
| 272 this->gl_config.driver_loaded = 0; | |
| 273 } | |
| 274 } | |
| 275 | |
| 276 /* Passing a NULL path means load pointers from the application */ | |
| 277 int WIN_GL_LoadLibrary(_THIS, const char* path) | |
| 278 { | |
| 279 HMODULE handle; | |
| 280 | |
| 281 if ( gl_active ) { | |
| 282 SDL_SetError("OpenGL context already created"); | |
| 283 return -1; | |
| 284 } | |
| 285 | |
| 286 if ( path == NULL ) { | |
| 287 path = DEFAULT_GL_DRIVER_PATH; | |
| 288 } | |
| 289 handle = LoadLibrary(path); | |
| 290 if ( handle == NULL ) { | |
| 291 SDL_SetError("Could not load OpenGL library"); | |
| 292 return -1; | |
| 293 } | |
| 294 | |
| 295 /* Unload the old driver and reset the pointers */ | |
| 296 WIN_GL_UnloadLibrary(this); | |
| 297 | |
| 298 /* Load new function pointers */ | |
| 299 this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *)) | |
| 300 GetProcAddress(handle, "wglGetProcAddress"); | |
| 301 this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC)) | |
| 302 GetProcAddress(handle, "wglCreateContext"); | |
| 303 this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC)) | |
| 304 GetProcAddress(handle, "wglDeleteContext"); | |
| 305 this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC)) | |
| 306 GetProcAddress(handle, "wglMakeCurrent"); | |
| 307 | |
| 308 if ( (this->gl_data->wglGetProcAddress == NULL) || | |
| 309 (this->gl_data->wglCreateContext == NULL) || | |
| 310 (this->gl_data->wglDeleteContext == NULL) || | |
| 311 (this->gl_data->wglMakeCurrent == NULL) ) { | |
| 312 SDL_SetError("Could not retrieve OpenGL functions"); | |
| 313 FreeLibrary(handle); | |
| 314 return -1; | |
| 315 } | |
| 316 | |
| 317 this->gl_config.dll_handle = handle; | |
| 318 strcpy(this->gl_config.driver_path, path); | |
| 319 this->gl_config.driver_loaded = 1; | |
| 320 return 0; | |
| 321 } | |
| 322 | |
| 323 void *WIN_GL_GetProcAddress(_THIS, const char* proc) | |
| 324 { | |
| 325 void *func; | |
| 326 | |
| 327 /* This is to pick up extensions */ | |
| 328 func = this->gl_data->wglGetProcAddress(proc); | |
| 329 if ( ! func ) { | |
| 330 /* This is probably a normal GL function */ | |
| 331 func = GetProcAddress(this->gl_config.dll_handle, proc); | |
| 332 } | |
| 333 return func; | |
| 334 } | |
| 335 | |
| 336 #endif /* HAVE_OPENGL */ |