SDL_DirectFB_opengl.c (8091B)
1 /* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20 */ 21 #include "../../SDL_internal.h" 22 23 #if SDL_VIDEO_DRIVER_DIRECTFB 24 25 #include "SDL_DirectFB_video.h" 26 27 #if SDL_DIRECTFB_OPENGL 28 29 #include "SDL_DirectFB_opengl.h" 30 #include "SDL_DirectFB_window.h" 31 32 #include <directfbgl.h> 33 #include "SDL_loadso.h" 34 #endif 35 36 #if SDL_DIRECTFB_OPENGL 37 38 struct SDL_GLDriverData 39 { 40 int gl_active; /* to stop switching drivers while we have a valid context */ 41 int initialized; 42 DirectFB_GLContext *firstgl; /* linked list */ 43 44 /* OpenGL */ 45 void (*glFinish) (void); 46 void (*glFlush) (void); 47 }; 48 49 #define OPENGL_REQUIRS_DLOPEN 50 #if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN) 51 #include <dlfcn.h> 52 #define GL_LoadObject(X) dlopen(X, (RTLD_NOW|RTLD_GLOBAL)) 53 #define GL_LoadFunction dlsym 54 #define GL_UnloadObject dlclose 55 #else 56 #define GL_LoadObject SDL_LoadObject 57 #define GL_LoadFunction SDL_LoadFunction 58 #define GL_UnloadObject SDL_UnloadObject 59 #endif 60 61 static void DirectFB_GL_UnloadLibrary(_THIS); 62 63 int 64 DirectFB_GL_Initialize(_THIS) 65 { 66 if (_this->gl_data) { 67 return 0; 68 } 69 70 _this->gl_data = 71 (struct SDL_GLDriverData *) SDL_calloc(1, 72 sizeof(struct 73 SDL_GLDriverData)); 74 if (!_this->gl_data) { 75 return SDL_OutOfMemory(); 76 } 77 _this->gl_data->initialized = 0; 78 79 ++_this->gl_data->initialized; 80 _this->gl_data->firstgl = NULL; 81 82 if (DirectFB_GL_LoadLibrary(_this, NULL) < 0) { 83 return -1; 84 } 85 86 /* Initialize extensions */ 87 /* FIXME needed? 88 * X11_GL_InitExtensions(_this); 89 */ 90 91 return 0; 92 } 93 94 void 95 DirectFB_GL_Shutdown(_THIS) 96 { 97 if (!_this->gl_data || (--_this->gl_data->initialized > 0)) { 98 return; 99 } 100 101 DirectFB_GL_UnloadLibrary(_this); 102 103 SDL_free(_this->gl_data); 104 _this->gl_data = NULL; 105 } 106 107 int 108 DirectFB_GL_LoadLibrary(_THIS, const char *path) 109 { 110 void *handle = NULL; 111 112 SDL_DFB_DEBUG("Loadlibrary : %s\n", path); 113 114 if (_this->gl_data->gl_active) { 115 return SDL_SetError("OpenGL context already created"); 116 } 117 118 119 if (path == NULL) { 120 path = SDL_getenv("SDL_OPENGL_LIBRARY"); 121 if (path == NULL) { 122 path = "libGL.so.1"; 123 } 124 } 125 126 handle = GL_LoadObject(path); 127 if (handle == NULL) { 128 SDL_DFB_ERR("Library not found: %s\n", path); 129 /* SDL_LoadObject() will call SDL_SetError() for us. */ 130 return -1; 131 } 132 133 SDL_DFB_DEBUG("Loaded library: %s\n", path); 134 135 _this->gl_config.dll_handle = handle; 136 if (path) { 137 SDL_strlcpy(_this->gl_config.driver_path, path, 138 SDL_arraysize(_this->gl_config.driver_path)); 139 } else { 140 *_this->gl_config.driver_path = '\0'; 141 } 142 143 _this->gl_data->glFinish = DirectFB_GL_GetProcAddress(_this, "glFinish"); 144 _this->gl_data->glFlush = DirectFB_GL_GetProcAddress(_this, "glFlush"); 145 146 return 0; 147 } 148 149 static void 150 DirectFB_GL_UnloadLibrary(_THIS) 151 { 152 #if 0 153 int ret = GL_UnloadObject(_this->gl_config.dll_handle); 154 if (ret) 155 SDL_DFB_ERR("Error #%d trying to unload library.\n", ret); 156 _this->gl_config.dll_handle = NULL; 157 #endif 158 /* Free OpenGL memory */ 159 SDL_free(_this->gl_data); 160 _this->gl_data = NULL; 161 } 162 163 void * 164 DirectFB_GL_GetProcAddress(_THIS, const char *proc) 165 { 166 void *handle; 167 168 handle = _this->gl_config.dll_handle; 169 return GL_LoadFunction(handle, proc); 170 } 171 172 SDL_GLContext 173 DirectFB_GL_CreateContext(_THIS, SDL_Window * window) 174 { 175 SDL_DFB_WINDOWDATA(window); 176 DirectFB_GLContext *context; 177 178 SDL_DFB_ALLOC_CLEAR(context, sizeof(DirectFB_GLContext)); 179 180 SDL_DFB_CHECKERR(windata->surface->GetGL(windata->surface, 181 &context->context)); 182 183 if (!context->context) 184 return NULL; 185 186 context->is_locked = 0; 187 context->sdl_window = window; 188 189 context->next = _this->gl_data->firstgl; 190 _this->gl_data->firstgl = context; 191 192 SDL_DFB_CHECK(context->context->Unlock(context->context)); 193 194 if (DirectFB_GL_MakeCurrent(_this, window, context) < 0) { 195 DirectFB_GL_DeleteContext(_this, context); 196 return NULL; 197 } 198 199 return context; 200 201 error: 202 return NULL; 203 } 204 205 int 206 DirectFB_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context) 207 { 208 DirectFB_GLContext *ctx = (DirectFB_GLContext *) context; 209 DirectFB_GLContext *p; 210 211 for (p = _this->gl_data->firstgl; p; p = p->next) 212 { 213 if (p->is_locked) { 214 SDL_DFB_CHECKERR(p->context->Unlock(p->context)); 215 p->is_locked = 0; 216 } 217 218 } 219 220 if (ctx != NULL) { 221 SDL_DFB_CHECKERR(ctx->context->Lock(ctx->context)); 222 ctx->is_locked = 1; 223 } 224 225 return 0; 226 error: 227 return -1; 228 } 229 230 int 231 DirectFB_GL_SetSwapInterval(_THIS, int interval) 232 { 233 return SDL_Unsupported(); 234 } 235 236 int 237 DirectFB_GL_GetSwapInterval(_THIS) 238 { 239 return 0; 240 } 241 242 int 243 DirectFB_GL_SwapWindow(_THIS, SDL_Window * window) 244 { 245 SDL_DFB_WINDOWDATA(window); 246 DirectFB_GLContext *p; 247 248 #if 0 249 if (devdata->glFinish) 250 devdata->glFinish(); 251 else if (devdata->glFlush) 252 devdata->glFlush(); 253 #endif 254 255 for (p = _this->gl_data->firstgl; p != NULL; p = p->next) 256 if (p->sdl_window == window && p->is_locked) 257 { 258 SDL_DFB_CHECKERR(p->context->Unlock(p->context)); 259 p->is_locked = 0; 260 } 261 262 SDL_DFB_CHECKERR(windata->window_surface->Flip(windata->window_surface,NULL, DSFLIP_PIPELINE |DSFLIP_BLIT | DSFLIP_ONSYNC )); 263 return 0; 264 error: 265 return -1; 266 } 267 268 void 269 DirectFB_GL_DeleteContext(_THIS, SDL_GLContext context) 270 { 271 DirectFB_GLContext *ctx = (DirectFB_GLContext *) context; 272 DirectFB_GLContext *p; 273 274 if (ctx->is_locked) 275 SDL_DFB_CHECK(ctx->context->Unlock(ctx->context)); 276 SDL_DFB_RELEASE(ctx->context); 277 278 for (p = _this->gl_data->firstgl; p && p->next != ctx; p = p->next) 279 ; 280 if (p) 281 p->next = ctx->next; 282 else 283 _this->gl_data->firstgl = ctx->next; 284 285 SDL_DFB_FREE(ctx); 286 } 287 288 void 289 DirectFB_GL_FreeWindowContexts(_THIS, SDL_Window * window) 290 { 291 DirectFB_GLContext *p; 292 293 for (p = _this->gl_data->firstgl; p != NULL; p = p->next) 294 if (p->sdl_window == window) 295 { 296 if (p->is_locked) 297 SDL_DFB_CHECK(p->context->Unlock(p->context)); 298 SDL_DFB_RELEASE(p->context); 299 } 300 } 301 302 void 303 DirectFB_GL_ReAllocWindowContexts(_THIS, SDL_Window * window) 304 { 305 DirectFB_GLContext *p; 306 307 for (p = _this->gl_data->firstgl; p != NULL; p = p->next) 308 if (p->sdl_window == window) 309 { 310 SDL_DFB_WINDOWDATA(window); 311 SDL_DFB_CHECK(windata->surface->GetGL(windata->surface, 312 &p->context)); 313 if (p->is_locked) 314 SDL_DFB_CHECK(p->context->Lock(p->context)); 315 } 316 } 317 318 void 319 DirectFB_GL_DestroyWindowContexts(_THIS, SDL_Window * window) 320 { 321 DirectFB_GLContext *p; 322 323 for (p = _this->gl_data->firstgl; p != NULL; p = p->next) 324 if (p->sdl_window == window) 325 DirectFB_GL_DeleteContext(_this, p); 326 } 327 328 #endif 329 330 #endif /* SDL_VIDEO_DRIVER_DIRECTFB */ 331 332 /* vi: set ts=4 sw=4 expandtab: */