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comparison src/video/SDL_renderer_sw.c @ 1676:e136f3ffdc1b SDL-1.3

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Adding software renderer implementation
author Sam Lantinga <slouken@libsdl.org>
date Mon, 12 Jun 2006 09:10:06 +0000
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children 90bf530ced8e
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1675:d33dcfc3fde7 1676:e136f3ffdc1b
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2006 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include "SDL_video.h"
25 #include "SDL_sysvideo.h"
26
27
28 /* SDL surface based renderer implementation */
29
30 static SDL_Renderer *SDL_SW_CreateRenderer(SDL_Window * window, Uint32 flags);
31 static int SDL_SW_CreateTexture(SDL_Renderer * renderer,
32 SDL_Texture * texture);
33 static int SDL_SW_UpdateTexture(SDL_Renderer * renderer,
34 SDL_Texture * texture, SDL_Rect * rect,
35 const void *pixels, int pitch);
36 static int SDL_SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
37 SDL_Rect * rect, int markDirty, void **pixels,
38 int *pitch);
39 static void SDL_SW_UnlockTexture(SDL_Renderer * renderer,
40 SDL_Texture * texture);
41 static void SDL_SW_DirtyTexture(SDL_Renderer * renderer,
42 SDL_Texture * texture, int numrects,
43 SDL_Rect * rects);
44 static void SDL_SW_SelectRenderTexture(SDL_Renderer * renderer,
45 SDL_Texture * texture);
46 static void SDL_SW_RenderFill(SDL_Renderer * renderer, SDL_Rect * rect,
47 Uint32 color);
48 static int SDL_SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
49 SDL_Rect * srcrect, SDL_Rect * dstrect,
50 int blendMode, int scaleMode);
51 static int SDL_SW_RenderReadPixels(SDL_Renderer * renderer, SDL_Rect * rect,
52 void *pixels, int pitch);
53 static int SDL_SW_RenderWritePixels(SDL_Renderer * renderer, SDL_Rect * rect,
54 const void *pixels, int pitch);
55 static void SDL_SW_RenderPresent(SDL_Renderer * renderer);
56 static void SDL_SW_DestroyTexture(SDL_Renderer * renderer,
57 SDL_Texture * texture);
58 static void SDL_SW_DestroyRenderer(SDL_Renderer * renderer);
59
60
61 SDL_RenderDriver SDL_SW_RenderDriver = {
62 SDL_SW_CreateRenderer,
63 {
64 "software",
65 (SDL_Renderer_PresentDiscard |
66 SDL_Renderer_PresentCopy |
67 SDL_Renderer_PresentFlip2 |
68 SDL_Renderer_PresentFlip3 | SDL_Renderer_RenderTarget),
69 (SDL_TextureBlendMode_None |
70 SDL_TextureBlendMode_Mask | SDL_TextureBlendMode_Blend),
71 (SDL_TextureScaleMode_None | SDL_TextureScaleMode_Fast),
72 11,
73 {
74 SDL_PixelFormat_Index8,
75 SDL_PixelFormat_RGB555,
76 SDL_PixelFormat_RGB565,
77 SDL_PixelFormat_RGB888,
78 SDL_PixelFormat_BGR888,
79 SDL_PixelFormat_ARGB8888,
80 SDL_PixelFormat_RGBA8888,
81 SDL_PixelFormat_ABGR8888,
82 SDL_PixelFormat_BGRA8888,
83 SDL_PixelFormat_YUY2,
84 SDL_PixelFormat_UYVY},
85 32768,
86 32768}
87 };
88
89 typedef struct
90 {
91 int current_screen;
92 SDL_Surface *screens[3];
93 SDL_Surface *target;
94 SDL_Renderer *renderer;
95 } SDL_SW_RenderData;
96
97 SDL_Renderer *
98 SDL_SW_CreateRenderer(SDL_Window * window, Uint32 flags)
99 {
100 SDL_DisplayMode *displayMode = &window->display->current_mode;
101 SDL_Renderer *renderer;
102 SDL_SW_RenderData *data;
103 int i, n;
104 int bpp;
105 Uint32 Rmask, Gmask, Bmask, Amask;
106
107 if (!SDL_PixelFormatEnumToMasks
108 (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
109 SDL_SetError("Unknown display format");
110 return NULL;
111 }
112
113 renderer = (SDL_Renderer *) SDL_malloc(sizeof(*renderer));
114 if (!renderer) {
115 SDL_OutOfMemory();
116 return NULL;
117 }
118 SDL_zerop(renderer);
119
120 data = (SDL_SW_RenderData *) SDL_malloc(sizeof(*data));
121 if (!data) {
122 SDL_SW_DestroyRenderer(renderer);
123 SDL_OutOfMemory();
124 return NULL;
125 }
126 SDL_zerop(data);
127
128 renderer->CreateTexture = SDL_SW_CreateTexture;
129 renderer->UpdateTexture = SDL_SW_UpdateTexture;
130 renderer->LockTexture = SDL_SW_LockTexture;
131 renderer->UnlockTexture = SDL_SW_UnlockTexture;
132 renderer->DirtyTexture = SDL_SW_DirtyTexture;
133 renderer->SelectRenderTexture = SDL_SW_SelectRenderTexture;
134 renderer->RenderFill = SDL_SW_RenderFill;
135 renderer->RenderCopy = SDL_SW_RenderCopy;
136 renderer->RenderReadPixels = SDL_SW_RenderReadPixels;
137 renderer->RenderWritePixels = SDL_SW_RenderWritePixels;
138 renderer->RenderPresent = SDL_SW_RenderPresent;
139 renderer->DestroyTexture = SDL_SW_DestroyTexture;
140 renderer->DestroyRenderer = SDL_SW_DestroyRenderer;
141 renderer->info = SDL_SW_RenderDriver.info;
142 renderer->window = window;
143 renderer->driverdata = data;
144
145 renderer->info.flags = SDL_Renderer_RenderTarget;
146
147 if (flags & SDL_Renderer_PresentFlip2) {
148 renderer->info.flags |= SDL_Renderer_PresentFlip2;
149 n = 2;
150 } else if (flags & SDL_Renderer_PresentFlip3) {
151 renderer->info.flags |= SDL_Renderer_PresentFlip3;
152 n = 3;
153 } else {
154 renderer->info.flags |= SDL_Renderer_PresentCopy;
155 n = 1;
156 }
157 for (i = 0; i < n; ++i) {
158 data->screens[i] =
159 SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
160 Bmask, Amask);
161 if (!data->screens[i]) {
162 SDL_SW_DestroyRenderer(renderer);
163 return NULL;
164 }
165 }
166 data->current_screen = 0;
167 data->target = data->screens[0];
168
169 /* Find a render driver that we can use to display data */
170 for (i = 0; i < window->display->num_render_drivers; ++i) {
171 SDL_RenderDriver *driver = &window->display->render_drivers[i];
172 if (driver->info.name != SDL_SW_RenderDriver.info.name) {
173 data->renderer =
174 driver->CreateRenderer(window, SDL_Renderer_PresentDiscard);
175 if (data->renderer) {
176 break;
177 }
178 }
179 }
180 if (i == window->display->num_render_drivers) {
181 SDL_SW_DestroyRenderer(renderer);
182 SDL_SetError("Couldn't find display render driver");
183 return NULL;
184 }
185 return renderer;
186 }
187
188 int
189 SDL_SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
190 {
191 SDL_Surface *surface;
192 int bpp;
193 Uint32 Rmask, Gmask, Bmask, Amask;
194
195 if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
196 /* FIXME: implement this */
197 return -1;
198 }
199
200 if (!SDL_PixelFormatEnumToMasks
201 (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
202 SDL_SetError("Unknown texture format");
203 return -1;
204 }
205
206 surface =
207 SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
208 Bmask, Amask);
209 if (!surface) {
210 return -1;
211 }
212
213 texture->driverdata = surface;
214 return 0;
215 }
216
217 int
218 SDL_SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
219 SDL_Rect * rect, const void *pixels, int pitch)
220 {
221 SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
222 Uint8 *src, *dst;
223 int row;
224 size_t length;
225
226 src = (Uint8 *) pixels;
227 dst =
228 (Uint8 *) surface->pixels + rect->y * surface->pitch +
229 rect->x * surface->format->BytesPerPixel;
230 length = rect->w * surface->format->BytesPerPixel;
231 for (row = 0; row < rect->h; ++row) {
232 SDL_memcpy(dst, src, length);
233 src += pitch;
234 dst += surface->pitch;
235 }
236 return 0;
237 }
238
239 int
240 SDL_SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
241 SDL_Rect * rect, int markDirty, void **pixels, int *pitch)
242 {
243 SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
244
245 *pixels =
246 (void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
247 rect->x * surface->format->BytesPerPixel);
248 *pitch = surface->pitch;
249 return 0;
250 }
251
252 void
253 SDL_SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
254 {
255 }
256
257 void
258 SDL_SW_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
259 int numrects, SDL_Rect * rects)
260 {
261 }
262
263 void
264 SDL_SW_SelectRenderTexture(SDL_Renderer * renderer, SDL_Texture * texture)
265 {
266 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
267 data->target = (SDL_Surface *) texture->driverdata;
268 }
269
270 void
271 SDL_SW_RenderFill(SDL_Renderer * renderer, SDL_Rect * rect, Uint32 color)
272 {
273 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
274 Uint8 r, g, b, a;
275
276 a = (Uint8) ((color >> 24) & 0xFF);
277 r = (Uint8) ((color >> 16) & 0xFF);
278 g = (Uint8) ((color >> 8) & 0xFF);
279 b = (Uint8) (color & 0xFF);
280 color = SDL_MapRGBA(data->target->format, r, g, b, a);
281
282 SDL_FillRect(data->target, rect, color);
283 }
284
285 int
286 SDL_SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
287 SDL_Rect * srcrect, SDL_Rect * dstrect, int blendMode,
288 int scaleMode)
289 {
290 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
291 SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
292
293 if (blendMode & (SDL_TextureBlendMode_Mask | SDL_TextureBlendMode_Blend)) {
294 SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
295 } else {
296 SDL_SetAlpha(surface, 0, 0);
297 }
298 if (scaleMode != SDL_TextureScaleMode_None &&
299 (srcrect->w != dstrect->w || srcrect->h != dstrect->h)) {
300 return SDL_SoftStretch(surface, srcrect, data->target, dstrect);
301 } else {
302 return SDL_LowerBlit(surface, srcrect, data->target, dstrect);
303 }
304 }
305
306 int
307 SDL_SW_RenderReadPixels(SDL_Renderer * renderer, SDL_Rect * rect,
308 void *pixels, int pitch)
309 {
310 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
311 SDL_Surface *surface = data->target;
312 Uint8 *src, *dst;
313 int row;
314 size_t length;
315
316 src =
317 (Uint8 *) surface->pixels + rect->y * surface->pitch +
318 rect->x * surface->format->BytesPerPixel;
319 dst = (Uint8 *) pixels;
320 length = rect->w * surface->format->BytesPerPixel;
321 for (row = 0; row < rect->h; ++row) {
322 SDL_memcpy(dst, src, length);
323 src += surface->pitch;
324 dst += pitch;
325 }
326 return 0;
327 }
328
329 int
330 SDL_SW_RenderWritePixels(SDL_Renderer * renderer, SDL_Rect * rect,
331 const void *pixels, int pitch)
332 {
333 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
334 SDL_Surface *surface = data->target;
335 Uint8 *src, *dst;
336 int row;
337 size_t length;
338
339 src = (Uint8 *) pixels;
340 dst =
341 (Uint8 *) surface->pixels + rect->y * surface->pitch +
342 rect->x * surface->format->BytesPerPixel;
343 length = rect->w * surface->format->BytesPerPixel;
344 for (row = 0; row < rect->h; ++row) {
345 SDL_memcpy(dst, src, length);
346 src += pitch;
347 dst += surface->pitch;
348 }
349 return 0;
350 }
351
352 void
353 SDL_SW_RenderPresent(SDL_Renderer * renderer)
354 {
355 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
356 SDL_Surface *surface = data->screens[data->current_screen];
357 SDL_Rect rect;
358 int new_screen;
359
360 /* Send the data to the display */
361 /* FIXME: implement dirty rect updates */
362 rect.x = 0;
363 rect.y = 0;
364 rect.w = surface->w;
365 rect.h = surface->h;
366 data->renderer->RenderWritePixels(data->renderer, &rect, surface->pixels,
367 surface->pitch);
368 data->renderer->RenderPresent(data->renderer);
369
370 /* Update the flipping chain, if any */
371 if (renderer->info.flags & SDL_Renderer_PresentFlip2) {
372 new_screen = (data->current_screen + 1) % 2;
373 } else if (renderer->info.flags & SDL_Renderer_PresentFlip3) {
374 new_screen = (data->current_screen + 1) % 3;
375 } else {
376 new_screen = 0;
377 }
378 if (data->target == data->screens[data->current_screen]) {
379 data->target = data->screens[new_screen];
380 }
381 data->current_screen = new_screen;
382 }
383
384 void
385 SDL_SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
386 {
387 SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
388
389 SDL_FreeSurface(surface);
390 }
391
392 void
393 SDL_SW_DestroyRenderer(SDL_Renderer * renderer)
394 {
395 SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
396 int i;
397
398 if (data) {
399 for (i = 0; i < SDL_arraysize(data->screens); ++i) {
400 if (data->screens[i]) {
401 SDL_FreeSurface(data->screens[i]);
402 }
403 }
404 SDL_free(data);
405 }
406 SDL_free(renderer);
407 }
408
409 /* vi: set ts=4 sw=4 expandtab: */