This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_render_gles.c
733 lines (618 loc) · 21.1 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
static void GLES_SetClipRect(SDL_Renderer * renderer, const SDL_Rect * rect);
60
61
62
63
64
65
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);
66
static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
67
68
const SDL_Rect * srcrect,
const SDL_Rect * dstrect);
69
static void GLES_RenderPresent(SDL_Renderer * renderer);
70
71
static void GLES_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
72
73
74
static void GLES_DestroyRenderer(SDL_Renderer * renderer);
75
SDL_RenderDriver GLES_RenderDriver = {
76
77
GLES_CreateRenderer,
{
78
79
"opengles",
(SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
80
81
1,
{SDL_PIXELFORMAT_ABGR8888},
82
0,
83
84
85
86
87
88
89
90
0}
};
typedef struct
{
SDL_GLContext context;
SDL_bool updateSize;
int blendMode;
91
92
93
SDL_bool useDrawTexture;
SDL_bool GL_OES_draw_texture_supported;
94
95
96
97
98
99
100
101
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
} 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);
}
SDL_Renderer *
GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
{
145
146
147
148
SDL_Renderer *renderer;
GLES_RenderData *data;
GLint value;
149
Uint32 window_flags;
150
151
152
153
window_flags = SDL_GetWindowFlags(window);
if (!(window_flags & SDL_WINDOW_OPENGL)) {
if (SDL_RecreateWindow(window, window_flags | SDL_WINDOW_OPENGL) < 0) {
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
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;
}
171
renderer->WindowEvent = GLES_WindowEvent;
172
173
174
175
renderer->CreateTexture = GLES_CreateTexture;
renderer->UpdateTexture = GLES_UpdateTexture;
renderer->LockTexture = GLES_LockTexture;
renderer->UnlockTexture = GLES_UnlockTexture;
176
renderer->SetClipRect = GLES_SetClipRect;
177
178
179
renderer->RenderDrawPoints = GLES_RenderDrawPoints;
renderer->RenderDrawLines = GLES_RenderDrawLines;
renderer->RenderFillRects = GLES_RenderFillRects;
180
181
182
183
renderer->RenderCopy = GLES_RenderCopy;
renderer->RenderPresent = GLES_RenderPresent;
renderer->DestroyTexture = GLES_DestroyTexture;
renderer->DestroyRenderer = GLES_DestroyRenderer;
184
renderer->info = GLES_RenderDriver.info;
185
renderer->driverdata = data;
186
187
renderer->info.flags = SDL_RENDERER_ACCELERATED;
188
189
190
191
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
192
data->context = SDL_GL_CreateContext(window);
193
194
195
196
if (!data->context) {
GLES_DestroyRenderer(renderer);
return NULL;
}
197
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
198
199
200
201
202
203
204
205
206
207
208
209
210
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;
}
211
212
213
214
#if SDL_VIDEO_DRIVER_PANDORA
data->GL_OES_draw_texture_supported = SDL_FALSE;
data->useDrawTexture = SDL_FALSE;
#else
215
216
217
218
219
220
221
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;
}
222
#endif
223
224
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
225
renderer->info.max_texture_width = value;
226
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
227
228
229
230
renderer->info.max_texture_height = value;
/* Set up parameters for rendering */
data->blendMode = -1;
231
232
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
233
234
data->updateSize = SDL_TRUE;
235
236
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
237
238
239
240
return renderer;
}
241
242
static SDL_GLContext SDL_CurrentContext = NULL;
243
244
static int
GLES_ActivateRenderer(SDL_Renderer * renderer)
245
{
246
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
247
SDL_Window *window = renderer->window;
248
249
250
251
252
253
if (SDL_CurrentContext != data->context) {
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
return -1;
}
SDL_CurrentContext = data->context;
254
255
}
if (data->updateSize) {
256
257
258
int w, h;
SDL_GetWindowSize(window, &w, &h);
259
260
261
262
263
264
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, w, h);
glOrthof(0.0, (GLfloat) w, (GLfloat) h, 0.0, 0.0, 1.0);
265
266
267
268
269
data->updateSize = SDL_FALSE;
}
return 0;
}
270
271
static void
GLES_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
272
273
274
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
275
276
277
278
279
if (event->event == SDL_WINDOWEVENT_RESIZED) {
/* Rebind the context to the window area and update matrices */
SDL_CurrentContext = NULL;
data->updateSize = SDL_TRUE;
}
280
281
282
283
284
285
286
287
288
289
290
291
292
293
}
static __inline__ int
power_of_2(int input)
{
int value = 1;
while (value < input) {
value <<= 1;
}
return value;
}
static int
294
GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
295
296
297
298
299
300
301
{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum result;
302
303
304
GLES_ActivateRenderer(renderer);
305
306
switch (texture->format) {
case SDL_PIXELFORMAT_ABGR8888:
307
308
309
310
internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_BYTE;
break;
311
default:
312
SDL_SetError("Texture format not supported");
313
314
315
316
return -1;
}
data = (GLES_TextureData *) SDL_calloc(1, sizeof(*data));
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
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;
334
335
336
glGetError();
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &data->texture);
337
338
339
340
341
342
343
344
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;
345
346
data->format = format;
data->formattype = type;
347
348
glBindTexture(data->type, data->texture);
glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,
349
GL_LINEAR);
350
glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,
351
GL_LINEAR);
352
glTexParameteri(data->type, GL_TEXTURE_WRAP_S,
353
GL_CLAMP_TO_EDGE);
354
glTexParameteri(data->type, GL_TEXTURE_WRAP_T,
355
GL_CLAMP_TO_EDGE);
356
357
glTexImage2D(data->type, 0, internalFormat, texture_w,
358
texture_h, 0, format, type, NULL);
359
glDisable(GL_TEXTURE_2D);
360
361
result = glGetError();
362
363
364
365
366
367
368
369
if (result != GL_NO_ERROR) {
GLES_SetError("glTexImage2D()", result);
return -1;
}
return 0;
}
static int
370
371
GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
372
373
374
375
{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
GLenum result;
376
377
378
379
int bpp = SDL_BYTESPERPIXEL(texture->format);
void * temp_buffer;
void * temp_ptr;
int i;
380
381
382
GLES_ActivateRenderer(renderer);
383
384
385
386
glGetError();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glEnable(data->type);
glBindTexture(data->type, data->texture);
387
388
389
390
391
392
393
394
395
396
397
398
399
400
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;
}
}
401
glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
402
rect->h, data->format, data->formattype,
403
404
405
406
407
408
temp_buffer);
if( temp_buffer != pixels ) {
SDL_free(temp_buffer);
}
409
410
glDisable(data->type);
result = glGetError();
411
412
413
414
415
416
417
418
419
if (result != GL_NO_ERROR) {
GLES_SetError("glTexSubImage2D()", result);
return -1;
}
return 0;
}
static int
GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
420
const SDL_Rect * rect, void **pixels, int *pitch)
421
422
423
424
425
426
427
428
429
430
431
432
433
{
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)
{
434
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
435
436
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
437
438
GLES_ActivateRenderer(renderer);
439
440
441
442
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glEnable(data->type);
glBindTexture(data->type, data->texture);
glTexSubImage2D(data->type, 0, 0, 0, texture->w,
443
444
texture->h, data->format, data->formattype,
data->pixels);
445
glDisable(data->type);
446
447
}
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
static void
GLES_SetClipRect(SDL_Renderer * renderer, const SDL_Rect * rect)
{
GL_ActivateRenderer(renderer);
if (rect) {
int w, h;
SDL_GetWindowSize(renderer->window, &w, &h);
glScissor(rect->x, (h-(rect->y+rect->h)), rect->w, rect->h);
glEnable(GL_SCISSOR_TEST);
} else {
glDisable(GL_SCISSOR_TEST);
}
}
464
static void
465
GLES_SetBlendMode(GLES_RenderData * data, int blendMode)
466
467
468
469
{
if (blendMode != data->blendMode) {
switch (blendMode) {
case SDL_BLENDMODE_NONE:
470
471
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glDisable(GL_BLEND);
472
473
break;
case SDL_BLENDMODE_BLEND:
474
475
476
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
477
478
break;
case SDL_BLENDMODE_ADD:
479
480
481
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
482
break;
483
case SDL_BLENDMODE_MOD:
484
485
486
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable(GL_BLEND);
glBlendFunc(GL_ZERO, GL_SRC_COLOR);
487
break;
488
489
490
491
492
}
data->blendMode = blendMode;
}
}
493
static int
494
495
GLES_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
496
{
497
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
498
499
int i;
GLshort *vertices;
500
501
502
GLES_ActivateRenderer(renderer);
503
GLES_SetBlendMode(data, renderer->blendMode);
504
505
glColor4f((GLfloat) renderer->r * inv255f,
506
507
508
509
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
510
511
512
513
514
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;
}
515
516
glVertexPointer(2, GL_SHORT, 0, vertices);
glDrawArrays(GL_POINTS, 0, count);
517
SDL_stack_free(vertices);
518
519
520
return 0;
}
521
522
static int
523
524
GLES_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
525
{
526
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
527
528
int i;
GLshort *vertices;
529
530
531
GLES_ActivateRenderer(renderer);
532
GLES_SetBlendMode(data, renderer->blendMode);
533
534
glColor4f((GLfloat) renderer->r * inv255f,
535
536
537
538
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
539
540
541
542
543
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;
}
544
glVertexPointer(2, GL_SHORT, 0, vertices);
545
546
547
548
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;
549
glDrawArrays(GL_LINE_LOOP, 0, count);
550
} else {
551
glDrawArrays(GL_LINE_STRIP, 0, count);
552
}
553
SDL_stack_free(vertices);
554
555
556
return 0;
}
557
558
559
560
static int
GLES_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
int count)
561
562
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
563
int i;
564
565
566
GLES_ActivateRenderer(renderer);
567
GLES_SetBlendMode(data, renderer->blendMode);
568
569
glColor4f((GLfloat) renderer->r * inv255f,
570
571
572
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
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;
590
591
glVertexPointer(2, GL_SHORT, 0, vertices);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
592
}
593
594
return 0;
595
596
597
598
}
static int
GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
599
const SDL_Rect * srcrect, const SDL_Rect * dstrect)
600
{
601
602
603
604
605
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
int minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
606
607
608
609
int i;
void *temp_buffer; /* used for reformatting dirty rect pixels */
void *temp_ptr;
610
611
GLES_ActivateRenderer(renderer);
612
glEnable(GL_TEXTURE_2D);
613
614
glBindTexture(texturedata->type, texturedata->texture);
615
616
if (texture->modMode) {
617
glColor4f((GLfloat) texture->r * inv255f,
618
619
620
621
(GLfloat) texture->g * inv255f,
(GLfloat) texture->b * inv255f,
(GLfloat) texture->a * inv255f);
} else {
622
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
623
624
}
625
GLES_SetBlendMode(data, texture->blendMode);
626
627
628
629
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];
630
631
632
633
int w, h;
SDL_Window *window = renderer->window;
SDL_GetWindowSize(window, &w, &h);
634
635
636
637
cropRect[0] = srcrect->x;
cropRect[1] = srcrect->y + srcrect->h;
cropRect[2] = srcrect->w;
cropRect[3] = -srcrect->h;
638
glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
639
cropRect);
640
glDrawTexiOES(dstrect->x, h - dstrect->y - dstrect->h, 0,
641
dstrect->w, dstrect->h);
642
643
644
645
646
647
648
649
650
651
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
} 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;
679
680
681
glVertexPointer(2, GL_SHORT, 0, vertices);
glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
682
683
}
684
glDisable(GL_TEXTURE_2D);
685
686
687
688
689
return 0;
}
static void
690
GLES_RenderPresent(SDL_Renderer * renderer)
691
{
692
693
GLES_ActivateRenderer(renderer);
694
695
696
697
698
699
700
701
SDL_GL_SwapWindow(renderer->window);
}
static void
GLES_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
702
703
GLES_ActivateRenderer(renderer);
704
705
706
707
if (!data) {
return;
}
if (data->texture) {
708
glDeleteTextures(1, &data->texture);
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
}
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);
}
731
#endif /* SDL_VIDEO_RENDER_OGL_ES */
732
733
/* vi: set ts=4 sw=4 expandtab: */