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comparison src/video/SDL_renderer_gl.c @ 3435:9f62f47d989b

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You can specify the format for pixel data in SDL_RenderReadPixels() and SDL_RenderWritePixels() This code still doesn't quite work yet. :)
author Sam Lantinga <slouken@libsdl.org>
date Mon, 16 Nov 2009 07:13:07 +0000
parents ad845d9835aa
children e9502d56ae94
comparison
equal deleted inserted replaced
3434:147d6ef5be03 3435:9f62f47d989b
101 int y2); 101 int y2);
102 static int GL_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect); 102 static int GL_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect);
103 static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture, 103 static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
104 const SDL_Rect * srcrect, const SDL_Rect * dstrect); 104 const SDL_Rect * srcrect, const SDL_Rect * dstrect);
105 static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect, 105 static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
106 void * pixels, int pitch); 106 Uint32 pixel_format, void * pixels, int pitch);
107 static int GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect, 107 static int GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
108 const void * pixels, int pitch); 108 Uint32 pixel_format, const void * pixels, int pitch);
109 static void GL_RenderPresent(SDL_Renderer * renderer); 109 static void GL_RenderPresent(SDL_Renderer * renderer);
110 static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture); 110 static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
111 static void GL_DestroyRenderer(SDL_Renderer * renderer); 111 static void GL_DestroyRenderer(SDL_Renderer * renderer);
112 112
113 113
1252 return 0; 1252 return 0;
1253 } 1253 }
1254 1254
1255 static int 1255 static int
1256 GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect, 1256 GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
1257 void * pixels, int pitch) 1257 Uint32 pixel_format, void * pixels, int pitch)
1258 { 1258 {
1259 GL_RenderData *data = (GL_RenderData *) renderer->driverdata; 1259 GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
1260 SDL_Window *window = SDL_GetWindowFromID(renderer->window);
1261 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
1262 Uint32 pixel_format = display->current_mode.format;
1263 GLint internalFormat; 1260 GLint internalFormat;
1264 GLenum format, type; 1261 GLenum format, type;
1262 Uint8 *src, *dst, *tmp;
1263 int length, rows;
1265 1264
1266 if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) { 1265 if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
1266 /* FIXME: Do a temp copy to a format that is supported */
1267 SDL_SetError("Unsupported pixel format"); 1267 SDL_SetError("Unsupported pixel format");
1268 return -1; 1268 return -1;
1269 } 1269 }
1270 1270
1271 if (pixel_format == SDL_PIXELFORMAT_INDEX1LSB) { 1271 if (pixel_format == SDL_PIXELFORMAT_INDEX1LSB) {
1273 } else if (pixel_format == SDL_PIXELFORMAT_INDEX1MSB) { 1273 } else if (pixel_format == SDL_PIXELFORMAT_INDEX1MSB) {
1274 data->glPixelStorei(GL_PACK_LSB_FIRST, 0); 1274 data->glPixelStorei(GL_PACK_LSB_FIRST, 0);
1275 } 1275 }
1276 data->glPixelStorei(GL_PACK_ALIGNMENT, 1); 1276 data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
1277 data->glPixelStorei(GL_PACK_ROW_LENGTH, 1277 data->glPixelStorei(GL_PACK_ROW_LENGTH,
1278 -2 * (pitch / bytes_per_pixel(pixel_format))); 1278 (pitch / bytes_per_pixel(pixel_format)));
1279 1279
1280 data->glReadPixels(rect->x, rect->y+rect->h-1, rect->w, rect->h, 1280 data->glReadPixels(rect->x, rect->y+rect->h-1, rect->w, rect->h,
1281 format, type, pixels + (rect->h-1)*pitch); 1281 format, type, pixels);
1282
1283 /* Flip the rows to be top-down */
1284 length = rect->w * bytes_per_pixel(pixel_format);
1285 src = (Uint8*)pixels + (rect->h-1)*pitch;
1286 dst = (Uint8*)pixels;
1287 tmp = SDL_stack_alloc(Uint8, length);
1288 rows = rect->h / 2;
1289 while (rows--) {
1290 SDL_memcpy(tmp, dst, length);
1291 SDL_memcpy(dst, src, length);
1292 SDL_memcpy(src, tmp, length);
1293 }
1294 SDL_stack_free(tmp);
1282 } 1295 }
1283 1296
1284 static int 1297 static int
1285 GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect, 1298 GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
1286 const void * pixels, int pitch) 1299 Uint32 pixel_format, const void * pixels, int pitch)
1287 { 1300 {
1301 GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
1302 GLint internalFormat;
1303 GLenum format, type;
1304
1305 if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
1306 /* FIXME: Do a temp copy to a format that is supported */
1307 SDL_SetError("Unsupported pixel format");
1308 return -1;
1309 }
1310
1311 /* FIXME: We need to copy the data and flip it */
1312
1313 if (pixel_format == SDL_PIXELFORMAT_INDEX1LSB) {
1314 data->glPixelStorei(GL_UNPACK_LSB_FIRST, 1);
1315 } else if (pixel_format == SDL_PIXELFORMAT_INDEX1MSB) {
1316 data->glPixelStorei(GL_UNPACK_LSB_FIRST, 0);
1317 }
1318 data->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
1319 data->glPixelStorei(GL_UNPACK_ROW_LENGTH,
1320 (pitch / bytes_per_pixel(pixel_format)));
1321
1322 data->glReadPixels(rect->x, rect->y+rect->h-1, rect->w, rect->h,
1323 format, type, pixels);
1288 } 1324 }
1289 1325
1290 static void 1326 static void
1291 GL_RenderPresent(SDL_Renderer * renderer) 1327 GL_RenderPresent(SDL_Renderer * renderer)
1292 { 1328 {