This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_renderer_gles.c
743 lines (623 loc) · 21.6 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2010 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#if SDL_VIDEO_RENDER_OGL_ES
#include "SDL_opengles.h"
27
#include "../SDL_sysrender.h"
28
29
#if defined(SDL_VIDEO_DRIVER_PANDORA)
30
31
32
/* Empty function stub to get OpenGL ES 1.x support without */
/* OpenGL ES extension GL_OES_draw_texture supported */
33
34
35
36
37
GL_API void GL_APIENTRY
glDrawTexiOES(GLint x, GLint y, GLint z, GLint width, GLint height)
{
return;
}
38
39
#endif /* PANDORA */
40
41
42
/* OpenGL ES 1.1 renderer implementation, based on the OpenGL renderer */
43
44
45
/* Used to re-create the window with OpenGL capability */
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
46
47
48
static const float inv255f = 1.0f / 255.0f;
static SDL_Renderer *GLES_CreateRenderer(SDL_Window * window, Uint32 flags);
49
50
static void GLES_WindowEvent(SDL_Renderer * renderer,
const SDL_WindowEvent *event);
51
52
static int GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
53
54
const SDL_Rect * rect, const void *pixels,
int pitch);
55
static int GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
56
const SDL_Rect * rect, void **pixels, int *pitch);
57
58
static void GLES_UnlockTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
59
60
61
62
63
64
static int GLES_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int GLES_RenderDrawLines(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int GLES_RenderFillRects(SDL_Renderer * renderer,
const SDL_Rect ** rects, int count);
65
static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
66
67
const SDL_Rect * srcrect,
const SDL_Rect * dstrect);
68
static void GLES_RenderPresent(SDL_Renderer * renderer);
69
70
static void GLES_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
71
72
73
74
75
76
77
static void GLES_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver GL_ES_RenderDriver = {
GLES_CreateRenderer,
{
"opengl_es",
78
(SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),
79
80
1,
{SDL_PIXELFORMAT_ABGR8888},
81
0,
82
83
84
85
86
87
88
89
0}
};
typedef struct
{
SDL_GLContext context;
SDL_bool updateSize;
int blendMode;
90
91
92
93
#ifndef APIENTRY
#define APIENTRY
#endif
94
95
96
97
98
99
SDL_bool useDrawTexture;
SDL_bool GL_OES_draw_texture_supported;
/* OpenGL ES functions */
#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
100
#include "../../video/SDL_glesfuncs.h"
101
#undef SDL_PROC
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
} GLES_RenderData;
typedef struct
{
GLuint texture;
GLenum type;
GLfloat texw;
GLfloat texh;
GLenum format;
GLenum formattype;
void *pixels;
int pitch;
} GLES_TextureData;
static void
GLES_SetError(const char *prefix, GLenum result)
{
const char *error;
switch (result) {
case GL_NO_ERROR:
error = "GL_NO_ERROR";
break;
case GL_INVALID_ENUM:
error = "GL_INVALID_ENUM";
break;
case GL_INVALID_VALUE:
error = "GL_INVALID_VALUE";
break;
case GL_INVALID_OPERATION:
error = "GL_INVALID_OPERATION";
break;
case GL_STACK_OVERFLOW:
error = "GL_STACK_OVERFLOW";
break;
case GL_STACK_UNDERFLOW:
error = "GL_STACK_UNDERFLOW";
break;
case GL_OUT_OF_MEMORY:
error = "GL_OUT_OF_MEMORY";
break;
default:
error = "UNKNOWN";
break;
}
SDL_SetError("%s: %s", prefix, error);
}
static int
GLES_LoadFunctions(GLES_RenderData * data)
{
154
155
#define SDL_PROC(ret,func,params) \
156
data->func = func;
157
#include "../../video/SDL_glesfuncs.h"
158
159
#undef SDL_PROC
160
161
162
163
164
165
return 0;
}
SDL_Renderer *
GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
{
166
167
168
169
SDL_Renderer *renderer;
GLES_RenderData *data;
GLint value;
170
Uint32 window_flags;
171
172
173
174
window_flags = SDL_GetWindowFlags(window);
if (!(window_flags & SDL_WINDOW_OPENGL)) {
if (SDL_RecreateWindow(window, window_flags | SDL_WINDOW_OPENGL) < 0) {
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
return NULL;
}
}
renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
data = (GLES_RenderData *) SDL_calloc(1, sizeof(*data));
if (!data) {
GLES_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
192
renderer->WindowEvent = GLES_WindowEvent;
193
194
195
196
renderer->CreateTexture = GLES_CreateTexture;
renderer->UpdateTexture = GLES_UpdateTexture;
renderer->LockTexture = GLES_LockTexture;
renderer->UnlockTexture = GLES_UnlockTexture;
197
198
199
renderer->RenderDrawPoints = GLES_RenderDrawPoints;
renderer->RenderDrawLines = GLES_RenderDrawLines;
renderer->RenderFillRects = GLES_RenderFillRects;
200
201
202
203
204
205
renderer->RenderCopy = GLES_RenderCopy;
renderer->RenderPresent = GLES_RenderPresent;
renderer->DestroyTexture = GLES_DestroyTexture;
renderer->DestroyRenderer = GLES_DestroyRenderer;
renderer->info = GL_ES_RenderDriver.info;
renderer->driverdata = data;
206
207
renderer->info.flags = SDL_RENDERER_ACCELERATED;
208
209
210
211
212
213
if (GLES_LoadFunctions(data) < 0) {
GLES_DestroyRenderer(renderer);
return NULL;
}
214
data->context = SDL_GL_CreateContext(window);
215
216
217
218
if (!data->context) {
GLES_DestroyRenderer(renderer);
return NULL;
}
219
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
220
221
222
223
224
225
226
227
228
229
230
231
232
GLES_DestroyRenderer(renderer);
return NULL;
}
if (flags & SDL_RENDERER_PRESENTVSYNC) {
SDL_GL_SetSwapInterval(1);
} else {
SDL_GL_SetSwapInterval(0);
}
if (SDL_GL_GetSwapInterval() > 0) {
renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
}
233
234
235
236
#if SDL_VIDEO_DRIVER_PANDORA
data->GL_OES_draw_texture_supported = SDL_FALSE;
data->useDrawTexture = SDL_FALSE;
#else
237
238
239
240
241
242
243
if (SDL_GL_ExtensionSupported("GL_OES_draw_texture")) {
data->GL_OES_draw_texture_supported = SDL_TRUE;
data->useDrawTexture = SDL_TRUE;
} else {
data->GL_OES_draw_texture_supported = SDL_FALSE;
data->useDrawTexture = SDL_FALSE;
}
244
#endif
245
246
247
248
249
250
251
252
253
254
255
256
data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
renderer->info.max_texture_width = value;
data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
renderer->info.max_texture_height = value;
/* Set up parameters for rendering */
data->blendMode = -1;
data->glDisable(GL_DEPTH_TEST);
data->glDisable(GL_CULL_FACE);
data->updateSize = SDL_TRUE;
257
258
259
data->glEnableClientState(GL_VERTEX_ARRAY);
data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);
260
261
262
return renderer;
}
263
264
static SDL_GLContext SDL_CurrentContext = NULL;
265
266
static int
GLES_ActivateRenderer(SDL_Renderer * renderer)
267
{
268
269
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
270
SDL_Window *window = renderer->window;
271
272
273
274
275
276
if (SDL_CurrentContext != data->context) {
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
return -1;
}
SDL_CurrentContext = data->context;
277
278
}
if (data->updateSize) {
279
280
281
int w, h;
SDL_GetWindowSize(window, &w, &h);
282
283
284
285
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glMatrixMode(GL_MODELVIEW);
data->glLoadIdentity();
286
287
data->glViewport(0, 0, w, h);
data->glOrthof(0.0, (GLfloat) w, (GLfloat) h, 0.0, 0.0, 1.0);
288
289
290
291
292
data->updateSize = SDL_FALSE;
}
return 0;
}
293
294
static void
GLES_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
295
296
297
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
298
299
300
301
302
if (event->event == SDL_WINDOWEVENT_RESIZED) {
/* Rebind the context to the window area and update matrices */
SDL_CurrentContext = NULL;
data->updateSize = SDL_TRUE;
}
303
304
305
306
307
308
309
310
311
312
313
314
315
316
}
static __inline__ int
power_of_2(int input)
{
int value = 1;
while (value < input) {
value <<= 1;
}
return value;
}
static int
317
GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
318
319
320
321
322
323
324
{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum result;
325
326
327
GLES_ActivateRenderer(renderer);
328
329
switch (texture->format) {
case SDL_PIXELFORMAT_ABGR8888:
330
331
332
333
internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_BYTE;
break;
334
default:
335
336
SDL_SetError("Texture format %s not supported by OpenGL ES",
SDL_GetPixelFormatName(texture->format));
337
338
339
340
return -1;
}
data = (GLES_TextureData *) SDL_calloc(1, sizeof(*data));
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
if (!data) {
SDL_OutOfMemory();
return -1;
}
if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
data->pixels = SDL_malloc(texture->h * data->pitch);
if (!data->pixels) {
SDL_OutOfMemory();
SDL_free(data);
return -1;
}
}
texture->driverdata = data;
renderdata->glGetError();
359
renderdata->glEnable(GL_TEXTURE_2D);
360
renderdata->glGenTextures(1, &data->texture);
361
362
363
364
365
366
367
368
data->type = GL_TEXTURE_2D;
/* no NPOV textures allowed in OpenGL ES (yet) */
texture_w = power_of_2(texture->w);
texture_h = power_of_2(texture->h);
data->texw = (GLfloat) texture->w / texture_w;
data->texh = (GLfloat) texture->h / texture_h;
369
370
371
372
data->format = format;
data->formattype = type;
renderdata->glBindTexture(data->type, data->texture);
renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,
373
GL_LINEAR);
374
renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,
375
GL_LINEAR);
376
377
378
379
renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S,
GL_CLAMP_TO_EDGE);
renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T,
GL_CLAMP_TO_EDGE);
380
381
382
renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
texture_h, 0, format, type, NULL);
383
renderdata->glDisable(GL_TEXTURE_2D);
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
GLES_SetError("glTexImage2D()", result);
return -1;
}
return 0;
}
static void
SetupTextureUpdate(GLES_RenderData * renderdata, SDL_Texture * texture,
int pitch)
{
renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
}
static int
401
402
GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
403
404
405
406
{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
GLenum result;
407
408
409
410
int bpp = SDL_BYTESPERPIXEL(texture->format);
void * temp_buffer;
void * temp_ptr;
int i;
411
412
413
GLES_ActivateRenderer(renderer);
414
renderdata->glGetError();
415
SetupTextureUpdate(renderdata, texture, pitch);
416
417
renderdata->glEnable(data->type);
renderdata->glBindTexture(data->type, data->texture);
418
419
420
421
422
423
424
425
426
427
428
429
430
431
if( rect->w * bpp == pitch ) {
temp_buffer = (void *)pixels; /* No need to reformat */
} else {
/* Reformatting of mem area required */
temp_buffer = SDL_malloc(rect->w * rect->h * bpp);
temp_ptr = temp_buffer;
for (i = 0; i < rect->h; i++) {
SDL_memcpy(temp_ptr, pixels, rect->w * bpp);
temp_ptr += rect->w * bpp;
pixels += pitch;
}
}
432
renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
433
rect->h, data->format, data->formattype,
434
435
436
437
438
439
temp_buffer);
if( temp_buffer != pixels ) {
SDL_free(temp_buffer);
}
440
renderdata->glDisable(data->type);
441
442
443
444
445
446
447
448
449
450
result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
GLES_SetError("glTexSubImage2D()", result);
return -1;
}
return 0;
}
static int
GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
451
const SDL_Rect * rect, void **pixels, int *pitch)
452
453
454
455
456
457
458
459
460
461
462
463
464
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
*pixels =
(void *) ((Uint8 *) data->pixels + rect->y * data->pitch +
rect->x * SDL_BYTESPERPIXEL(texture->format));
*pitch = data->pitch;
return 0;
}
static void
GLES_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
465
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
466
467
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
468
469
470
471
472
473
474
475
476
GLES_ActivateRenderer(renderer);
SetupTextureUpdate(renderdata, texture, data->pitch);
renderdata->glEnable(data->type);
renderdata->glBindTexture(data->type, data->texture);
renderdata->glTexSubImage2D(data->type, 0, 0, 0, texture->w,
texture->h, data->format, data->formattype,
data->pixels);
renderdata->glDisable(data->type);
477
478
}
479
static void
480
GLES_SetBlendMode(GLES_RenderData * data, int blendMode)
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
{
if (blendMode != data->blendMode) {
switch (blendMode) {
case SDL_BLENDMODE_NONE:
data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
data->glDisable(GL_BLEND);
break;
case SDL_BLENDMODE_BLEND:
data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
data->glEnable(GL_BLEND);
data->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
break;
case SDL_BLENDMODE_ADD:
data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
data->glEnable(GL_BLEND);
data->glBlendFunc(GL_SRC_ALPHA, GL_ONE);
break;
}
data->blendMode = blendMode;
}
}
503
static int
504
505
GLES_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
506
{
507
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
508
509
int i;
GLshort *vertices;
510
511
512
GLES_ActivateRenderer(renderer);
513
GLES_SetBlendMode(data, renderer->blendMode);
514
515
516
517
518
519
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
520
521
522
523
524
525
vertices = SDL_stack_alloc(GLshort, count*2);
for (i = 0; i < count; ++i) {
vertices[2*i+0] = (GLshort)points[i].x;
vertices[2*i+1] = (GLshort)points[i].y;
}
data->glVertexPointer(2, GL_SHORT, 0, vertices);
526
data->glDrawArrays(GL_POINTS, 0, count);
527
SDL_stack_free(vertices);
528
529
530
return 0;
}
531
532
static int
533
534
GLES_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
535
{
536
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
537
538
int i;
GLshort *vertices;
539
540
541
GLES_ActivateRenderer(renderer);
542
GLES_SetBlendMode(data, renderer->blendMode);
543
544
545
546
547
548
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
549
550
551
552
553
554
vertices = SDL_stack_alloc(GLshort, count*2);
for (i = 0; i < count; ++i) {
vertices[2*i+0] = (GLshort)points[i].x;
vertices[2*i+1] = (GLshort)points[i].y;
}
data->glVertexPointer(2, GL_SHORT, 0, vertices);
555
556
557
558
559
560
561
562
if (count > 2 &&
points[0].x == points[count-1].x && points[0].y == points[count-1].y) {
/* GL_LINE_LOOP takes care of the final segment */
--count;
data->glDrawArrays(GL_LINE_LOOP, 0, count);
} else {
data->glDrawArrays(GL_LINE_STRIP, 0, count);
}
563
SDL_stack_free(vertices);
564
565
566
return 0;
}
567
568
569
570
static int
GLES_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
int count)
571
572
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
573
int i;
574
575
576
GLES_ActivateRenderer(renderer);
577
GLES_SetBlendMode(data, renderer->blendMode);
578
579
580
581
582
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
for (i = 0; i < count; ++i) {
const SDL_Rect *rect = rects[i];
GLshort minx = rect->x;
GLshort maxx = rect->x + rect->w;
GLshort miny = rect->y;
GLshort maxy = rect->y + rect->h;
GLshort vertices[8];
vertices[0] = minx;
vertices[1] = miny;
vertices[2] = maxx;
vertices[3] = miny;
vertices[4] = minx;
vertices[5] = maxy;
vertices[6] = maxx;
vertices[7] = maxy;
data->glVertexPointer(2, GL_SHORT, 0, vertices);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
603
604
return 0;
605
606
607
608
}
static int
GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
609
const SDL_Rect * srcrect, const SDL_Rect * dstrect)
610
{
611
612
613
614
615
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
int minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
616
617
618
619
int i;
void *temp_buffer; /* used for reformatting dirty rect pixels */
void *temp_ptr;
620
621
GLES_ActivateRenderer(renderer);
622
623
data->glEnable(GL_TEXTURE_2D);
624
data->glBindTexture(texturedata->type, texturedata->texture);
625
626
627
628
629
630
631
632
633
634
if (texture->modMode) {
data->glColor4f((GLfloat) texture->r * inv255f,
(GLfloat) texture->g * inv255f,
(GLfloat) texture->b * inv255f,
(GLfloat) texture->a * inv255f);
} else {
data->glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
}
635
GLES_SetBlendMode(data, texture->blendMode);
636
637
638
639
if (data->GL_OES_draw_texture_supported && data->useDrawTexture) {
/* this code is a little funny because the viewport is upside down vs SDL's coordinate system */
GLint cropRect[4];
640
641
642
643
int w, h;
SDL_Window *window = renderer->window;
SDL_GetWindowSize(window, &w, &h);
644
645
646
647
648
649
cropRect[0] = srcrect->x;
cropRect[1] = srcrect->y + srcrect->h;
cropRect[2] = srcrect->w;
cropRect[3] = -srcrect->h;
data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
cropRect);
650
651
data->glDrawTexiOES(dstrect->x, h - dstrect->y - dstrect->h, 0,
dstrect->w, dstrect->h);
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
} else {
minx = dstrect->x;
miny = dstrect->y;
maxx = dstrect->x + dstrect->w;
maxy = dstrect->y + dstrect->h;
minu = (GLfloat) srcrect->x / texture->w;
minu *= texturedata->texw;
maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;
maxu *= texturedata->texw;
minv = (GLfloat) srcrect->y / texture->h;
minv *= texturedata->texh;
maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;
maxv *= texturedata->texh;
GLshort vertices[8];
GLfloat texCoords[8];
vertices[0] = minx;
vertices[1] = miny;
vertices[2] = maxx;
vertices[3] = miny;
vertices[4] = minx;
vertices[5] = maxy;
vertices[6] = maxx;
vertices[7] = maxy;
texCoords[0] = minu;
texCoords[1] = minv;
texCoords[2] = maxu;
texCoords[3] = minv;
texCoords[4] = minu;
texCoords[5] = maxv;
texCoords[6] = maxu;
texCoords[7] = maxv;
data->glVertexPointer(2, GL_SHORT, 0, vertices);
data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
694
695
data->glDisable(GL_TEXTURE_2D);
696
697
698
699
return 0;
}
static void
700
GLES_RenderPresent(SDL_Renderer * renderer)
701
{
702
703
GLES_ActivateRenderer(renderer);
704
705
706
707
708
709
710
711
SDL_GL_SwapWindow(renderer->window);
}
static void
GLES_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
712
713
GLES_ActivateRenderer(renderer);
714
715
716
717
if (!data) {
return;
}
if (data->texture) {
718
glDeleteTextures(1, &data->texture);
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
}
if (data->pixels) {
SDL_free(data->pixels);
}
SDL_free(data);
texture->driverdata = NULL;
}
static void
GLES_DestroyRenderer(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
if (data) {
if (data->context) {
SDL_GL_DeleteContext(data->context);
}
SDL_free(data);
}
SDL_free(renderer);
}
741
#endif /* SDL_VIDEO_RENDER_OGL_ES */
742
743
/* vi: set ts=4 sw=4 expandtab: */