/
SDL_render_gles.c
1259 lines (1079 loc) · 39.8 KB
1
2
/*
Simple DirectMedia Layer
3
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_RENDER_OGL_ES && !SDL_RENDER_DISABLED
#include "SDL_hints.h"
#include "SDL_opengles.h"
#include "../SDL_sysrender.h"
29
30
/* To prevent unnecessary window recreation,
* these should match the defaults selected in SDL_GL_ResetAttributes
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
*/
#define RENDERER_CONTEXT_MAJOR 1
#define RENDERER_CONTEXT_MINOR 1
#if defined(SDL_VIDEO_DRIVER_PANDORA)
/* Empty function stub to get OpenGL ES 1.x support without */
/* OpenGL ES extension GL_OES_draw_texture supported */
GL_API void GL_APIENTRY
glDrawTexiOES(GLint x, GLint y, GLint z, GLint width, GLint height)
{
return;
}
#endif /* SDL_VIDEO_DRIVER_PANDORA */
/* OpenGL ES 1.1 renderer implementation, based on the OpenGL renderer */
/* Used to re-create the window with OpenGL ES capability */
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
static const float inv255f = 1.0f / 255.0f;
typedef struct GLES_FBOList GLES_FBOList;
struct GLES_FBOList
{
Uint32 w, h;
GLuint FBO;
GLES_FBOList *next;
};
64
65
66
typedef struct
{
SDL_Rect viewport;
67
SDL_bool viewport_dirty;
68
SDL_Texture *texture;
69
70
71
SDL_Texture *target;
int drawablew;
int drawableh;
72
SDL_BlendMode blend;
73
SDL_bool cliprect_enabled_dirty;
74
SDL_bool cliprect_enabled;
75
SDL_bool cliprect_dirty;
76
77
78
79
80
81
SDL_Rect cliprect;
SDL_bool texturing;
Uint32 color;
Uint32 clear_color;
} GLES_DrawStateCache;
82
83
84
85
86
87
88
89
90
91
92
93
94
95
typedef struct
{
SDL_GLContext context;
#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
#define SDL_PROC_OES SDL_PROC
#include "SDL_glesfuncs.h"
#undef SDL_PROC
#undef SDL_PROC_OES
SDL_bool GL_OES_framebuffer_object_supported;
GLES_FBOList *framebuffers;
GLuint window_framebuffer;
SDL_bool GL_OES_blend_func_separate_supported;
96
97
SDL_bool GL_OES_blend_equation_separate_supported;
SDL_bool GL_OES_blend_subtract_supported;
98
99
GLES_DrawStateCache drawstate;
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
} GLES_RenderData;
typedef struct
{
GLuint texture;
GLenum type;
GLfloat texw;
GLfloat texh;
GLenum format;
GLenum formattype;
void *pixels;
int pitch;
GLES_FBOList *fbo;
} GLES_TextureData;
static int
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;
}
return SDL_SetError("%s: %s", prefix, error);
}
static int GLES_LoadFunctions(GLES_RenderData * data)
{
#if SDL_VIDEO_DRIVER_UIKIT
#define __SDL_NOGETPROCADDR__
#elif SDL_VIDEO_DRIVER_ANDROID
#define __SDL_NOGETPROCADDR__
#elif SDL_VIDEO_DRIVER_PANDORA
#define __SDL_NOGETPROCADDR__
#endif
#ifdef __SDL_NOGETPROCADDR__
#define SDL_PROC(ret,func,params) data->func=func;
#define SDL_PROC_OES(ret,func,params) data->func=func;
#else
#define SDL_PROC(ret,func,params) \
do { \
165
data->func = SDL_GL_GetProcAddress(#func); \
166
if ( ! data->func ) { \
167
return SDL_SetError("Couldn't load GLES function %s: %s", #func, SDL_GetError()); \
168
169
170
171
} \
} while ( 0 );
#define SDL_PROC_OES(ret,func,params) \
do { \
172
data->func = SDL_GL_GetProcAddress(#func); \
173
} while ( 0 );
174
175
176
177
178
179
180
181
#endif /* __SDL_NOGETPROCADDR__ */
#include "SDL_glesfuncs.h"
#undef SDL_PROC
#undef SDL_PROC_OES
return 0;
}
182
static GLES_FBOList *
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
GLES_GetFBO(GLES_RenderData *data, Uint32 w, Uint32 h)
{
GLES_FBOList *result = data->framebuffers;
while ((result) && ((result->w != w) || (result->h != h)) ) {
result = result->next;
}
if (result == NULL) {
result = SDL_malloc(sizeof(GLES_FBOList));
result->w = w;
result->h = h;
data->glGenFramebuffersOES(1, &result->FBO);
result->next = data->framebuffers;
data->framebuffers = result;
}
return result;
}
static int
GLES_ActivateRenderer(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
206
if (SDL_GL_GetCurrentContext() != data->context) {
207
208
209
if (SDL_GL_MakeCurrent(renderer->window, data->context) < 0) {
return -1;
}
210
}
211
212
return 0;
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
}
static void
GLES_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
if (event->event == SDL_WINDOWEVENT_MINIMIZED) {
/* According to Apple documentation, we need to finish drawing NOW! */
data->glFinish();
}
}
static int
GLES_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
SDL_GL_GetDrawableSize(renderer->window, w, h);
return 0;
}
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
static GLenum GetBlendFunc(SDL_BlendFactor factor)
{
switch (factor) {
case SDL_BLENDFACTOR_ZERO:
return GL_ZERO;
case SDL_BLENDFACTOR_ONE:
return GL_ONE;
case SDL_BLENDFACTOR_SRC_COLOR:
return GL_SRC_COLOR;
case SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR:
return GL_ONE_MINUS_SRC_COLOR;
case SDL_BLENDFACTOR_SRC_ALPHA:
return GL_SRC_ALPHA;
case SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA:
return GL_ONE_MINUS_SRC_ALPHA;
case SDL_BLENDFACTOR_DST_COLOR:
return GL_DST_COLOR;
case SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR:
return GL_ONE_MINUS_DST_COLOR;
case SDL_BLENDFACTOR_DST_ALPHA:
return GL_DST_ALPHA;
case SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA:
return GL_ONE_MINUS_DST_ALPHA;
default:
return GL_INVALID_ENUM;
}
}
static GLenum GetBlendEquation(SDL_BlendOperation operation)
{
switch (operation) {
case SDL_BLENDOPERATION_ADD:
return GL_FUNC_ADD_OES;
case SDL_BLENDOPERATION_SUBTRACT:
return GL_FUNC_SUBTRACT_OES;
case SDL_BLENDOPERATION_REV_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT_OES;
default:
return GL_INVALID_ENUM;
}
}
static SDL_bool
GLES_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
SDL_BlendFactor srcColorFactor = SDL_GetBlendModeSrcColorFactor(blendMode);
SDL_BlendFactor srcAlphaFactor = SDL_GetBlendModeSrcAlphaFactor(blendMode);
SDL_BlendOperation colorOperation = SDL_GetBlendModeColorOperation(blendMode);
SDL_BlendFactor dstColorFactor = SDL_GetBlendModeDstColorFactor(blendMode);
SDL_BlendFactor dstAlphaFactor = SDL_GetBlendModeDstAlphaFactor(blendMode);
SDL_BlendOperation alphaOperation = SDL_GetBlendModeAlphaOperation(blendMode);
if (GetBlendFunc(srcColorFactor) == GL_INVALID_ENUM ||
GetBlendFunc(srcAlphaFactor) == GL_INVALID_ENUM ||
GetBlendEquation(colorOperation) == GL_INVALID_ENUM ||
GetBlendFunc(dstColorFactor) == GL_INVALID_ENUM ||
GetBlendFunc(dstAlphaFactor) == GL_INVALID_ENUM ||
GetBlendEquation(alphaOperation) == GL_INVALID_ENUM) {
return SDL_FALSE;
}
if ((srcColorFactor != srcAlphaFactor || dstColorFactor != dstAlphaFactor) && !data->GL_OES_blend_func_separate_supported) {
return SDL_FALSE;
}
if (colorOperation != alphaOperation && !data->GL_OES_blend_equation_separate_supported) {
return SDL_FALSE;
}
if (colorOperation != SDL_BLENDOPERATION_ADD && !data->GL_OES_blend_subtract_supported) {
return SDL_FALSE;
}
return SDL_TRUE;
}
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
static SDL_INLINE int
power_of_2(int input)
{
int value = 1;
while (value < input) {
value <<= 1;
}
return value;
}
static int
GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum scaleMode;
GLenum result;
GLES_ActivateRenderer(renderer);
switch (texture->format) {
case SDL_PIXELFORMAT_ABGR8888:
internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_BYTE;
break;
default:
return SDL_SetError("Texture format not supported");
}
data = (GLES_TextureData *) SDL_calloc(1, sizeof(*data));
if (!data) {
return SDL_OutOfMemory();
}
if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
data->pixels = SDL_calloc(1, texture->h * data->pitch);
if (!data->pixels) {
SDL_free(data);
return SDL_OutOfMemory();
}
}
354
355
356
357
358
359
360
361
362
363
if (texture->access == SDL_TEXTUREACCESS_TARGET) {
if (!renderdata->GL_OES_framebuffer_object_supported) {
SDL_free(data);
return SDL_SetError("GL_OES_framebuffer_object not supported");
}
data->fbo = GLES_GetFBO(renderer->driverdata, texture->w, texture->h);
} else {
data->fbo = NULL;
}
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
renderdata->glGetError();
renderdata->glEnable(GL_TEXTURE_2D);
renderdata->glGenTextures(1, &data->texture);
result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
SDL_free(data);
return GLES_SetError("glGenTextures()", result);
}
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;
data->format = format;
data->formattype = type;
384
scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;
385
386
387
388
389
390
391
392
393
renderdata->glBindTexture(data->type, data->texture);
renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER, scaleMode);
renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER, scaleMode);
renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
texture_h, 0, format, type, NULL);
renderdata->glDisable(GL_TEXTURE_2D);
394
395
renderdata->drawstate.texture = texture;
renderdata->drawstate.texturing = SDL_FALSE;
396
397
398
399
400
401
result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
SDL_free(data);
return GLES_SetError("glTexImage2D()", result);
}
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
texture->driverdata = data;
return 0;
}
static int
GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
Uint8 *blob = NULL;
Uint8 *src;
int srcPitch;
int y;
GLES_ActivateRenderer(renderer);
/* Bail out if we're supposed to update an empty rectangle */
if (rect->w <= 0 || rect->h <= 0) {
return 0;
}
/* Reformat the texture data into a tightly packed array */
srcPitch = rect->w * SDL_BYTESPERPIXEL(texture->format);
src = (Uint8 *)pixels;
if (pitch != srcPitch) {
blob = (Uint8 *)SDL_malloc(srcPitch * rect->h);
if (!blob) {
return SDL_OutOfMemory();
}
src = blob;
for (y = 0; y < rect->h; ++y) {
SDL_memcpy(src, pixels, srcPitch);
src += srcPitch;
pixels = (Uint8 *)pixels + pitch;
}
src = blob;
}
/* Create a texture subimage with the supplied data */
renderdata->glGetError();
renderdata->glEnable(data->type);
renderdata->glBindTexture(data->type, data->texture);
renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glTexSubImage2D(data->type,
0,
rect->x,
rect->y,
rect->w,
rect->h,
data->format,
data->formattype,
src);
456
renderdata->glDisable(data->type);
457
458
SDL_free(blob);
459
460
461
renderdata->drawstate.texture = texture;
renderdata->drawstate.texturing = SDL_FALSE;
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
if (renderdata->glGetError() != GL_NO_ERROR) {
return SDL_SetError("Failed to update texture");
}
return 0;
}
static int
GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch)
{
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)
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
SDL_Rect rect;
/* We do whole texture updates, at least for now */
rect.x = 0;
rect.y = 0;
rect.w = texture->w;
rect.h = texture->h;
GLES_UpdateTexture(renderer, texture, &rect, data->pixels, data->pitch);
}
static int
GLES_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = NULL;
GLenum status;
if (!data->GL_OES_framebuffer_object_supported) {
return SDL_SetError("Can't enable render target support in this renderer");
}
506
507
data->drawstate.viewport_dirty = SDL_TRUE;
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
if (texture == NULL) {
data->glBindFramebufferOES(GL_FRAMEBUFFER_OES, data->window_framebuffer);
return 0;
}
texturedata = (GLES_TextureData *) texture->driverdata;
data->glBindFramebufferOES(GL_FRAMEBUFFER_OES, texturedata->fbo->FBO);
/* TODO: check if texture pixel format allows this operation */
data->glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, texturedata->type, texturedata->texture, 0);
/* Check FBO status */
status = data->glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
if (status != GL_FRAMEBUFFER_COMPLETE_OES) {
return SDL_SetError("glFramebufferTexture2DOES() failed");
}
return 0;
}
static int
527
GLES_QueueSetViewport(SDL_Renderer * renderer, SDL_RenderCommand *cmd)
528
{
529
return 0; /* nothing to do in this backend. */
530
531
532
}
static int
533
GLES_QueueDrawPoints(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FPoint * points, int count)
534
{
535
536
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, count * 2 * sizeof (GLfloat), 0, &cmd->data.draw.first);
size_t i;
537
538
539
if (!verts) {
return -1;
540
}
541
542
543
544
545
cmd->data.draw.count = count;
for (i = 0; i < count; i++) {
*(verts++) = 0.5f + points[i].x;
*(verts++) = 0.5f + points[i].y;
546
547
}
548
549
550
551
return 0;
}
static int
552
GLES_QueueFillRects(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FRect * rects, int count)
553
{
554
555
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, count * 8 * sizeof (GLfloat), 0, &cmd->data.draw.first);
size_t i;
556
557
558
if (!verts) {
return -1;
559
560
}
561
cmd->data.draw.count = count;
562
563
for (i = 0; i < count; i++) {
564
const SDL_FRect *rect = &rects[i];
565
566
567
568
569
570
571
572
573
574
575
576
const GLfloat minx = rect->x;
const GLfloat maxx = rect->x + rect->w;
const GLfloat miny = rect->y;
const GLfloat maxy = rect->y + rect->h;
*(verts++) = minx;
*(verts++) = miny;
*(verts++) = maxx;
*(verts++) = miny;
*(verts++) = minx;
*(verts++) = maxy;
*(verts++) = maxx;
*(verts++) = maxy;
577
578
579
580
581
582
}
return 0;
}
static int
583
584
GLES_QueueCopy(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect)
585
{
586
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
587
588
GLfloat minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
589
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, 16 * sizeof (GLfloat), 0, &cmd->data.draw.first);
590
591
592
if (!verts) {
return -1;
593
594
}
595
cmd->data.draw.count = 1;
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
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;
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
*(verts++) = minx;
*(verts++) = miny;
*(verts++) = maxx;
*(verts++) = miny;
*(verts++) = minx;
*(verts++) = maxy;
*(verts++) = maxx;
*(verts++) = maxy;
*(verts++) = minu;
*(verts++) = minv;
*(verts++) = maxu;
*(verts++) = minv;
*(verts++) = minu;
*(verts++) = maxv;
*(verts++) = maxu;
*(verts++) = maxv;
628
629
630
631
632
return 0;
}
static int
633
634
635
GLES_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
const SDL_Rect * srcquad, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
636
{
637
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
638
639
GLfloat minx, miny, maxx, maxy;
GLfloat centerx, centery;
640
641
GLfloat minu, maxu, minv, maxv;
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, 19 * sizeof (GLfloat), 0, &cmd->data.draw.first);
642
643
644
if (!verts) {
return -1;
645
646
647
648
649
650
651
652
}
centerx = center->x;
centery = center->y;
if (flip & SDL_FLIP_HORIZONTAL) {
minx = dstrect->w - centerx;
maxx = -centerx;
653
654
}
else {
655
minx = -centerx;
656
maxx = dstrect->w - centerx;
657
658
659
}
if (flip & SDL_FLIP_VERTICAL) {
660
miny = dstrect->h - centery;
661
maxy = -centery;
662
663
}
else {
664
miny = -centery;
665
maxy = dstrect->h - centery;
666
667
}
668
minu = (GLfloat) srcquad->x / texture->w;
669
minu *= texturedata->texw;
670
maxu = (GLfloat) (srcquad->x + srcquad->w) / texture->w;
671
maxu *= texturedata->texw;
672
minv = (GLfloat) srcquad->y / texture->h;
673
minv *= texturedata->texh;
674
maxv = (GLfloat) (srcquad->y + srcquad->h) / texture->h;
675
676
maxv *= texturedata->texh;
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
cmd->data.draw.count = 1;
*(verts++) = minx;
*(verts++) = miny;
*(verts++) = maxx;
*(verts++) = miny;
*(verts++) = minx;
*(verts++) = maxy;
*(verts++) = maxx;
*(verts++) = maxy;
*(verts++) = minu;
*(verts++) = minv;
*(verts++) = maxu;
*(verts++) = minv;
*(verts++) = minu;
*(verts++) = maxv;
*(verts++) = maxu;
*(verts++) = maxv;
*(verts++) = (GLfloat) dstrect->x + centerx;
*(verts++) = (GLfloat) dstrect->y + centery;
*(verts++) = (GLfloat) angle;
700
701
702
703
return 0;
}
704
static void
705
SetDrawState(GLES_RenderData *data, const SDL_RenderCommand *cmd)
706
707
{
const SDL_BlendMode blend = cmd->data.draw.blend;
708
709
710
711
const Uint8 r = cmd->data.draw.r;
const Uint8 g = cmd->data.draw.g;
const Uint8 b = cmd->data.draw.b;
const Uint8 a = cmd->data.draw.a;
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
const Uint32 color = ((a << 24) | (r << 16) | (g << 8) | b);
if (color != data->drawstate.color) {
const GLfloat fr = ((GLfloat) r) * inv255f;
const GLfloat fg = ((GLfloat) g) * inv255f;
const GLfloat fb = ((GLfloat) b) * inv255f;
const GLfloat fa = ((GLfloat) a) * inv255f;
data->glColor4f(fr, fg, fb, fa);
data->drawstate.color = color;
}
if (data->drawstate.viewport_dirty) {
const SDL_Rect *viewport = &data->drawstate.viewport;
const SDL_bool istarget = (data->drawstate.target != NULL);
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glViewport(viewport->x,
istarget ? viewport->y : (data->drawstate.drawableh - viewport->y - viewport->h),
viewport->w, viewport->h);
if (viewport->w && viewport->h) {
data->glOrthof((GLfloat) 0, (GLfloat) viewport->w,
733
734
(GLfloat) (istarget ? 0 : viewport->h),
(GLfloat) (istarget ? viewport->h : 0),
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
0.0, 1.0);
}
data->glMatrixMode(GL_MODELVIEW);
data->drawstate.viewport_dirty = SDL_FALSE;
}
if (data->drawstate.cliprect_enabled_dirty) {
if (data->drawstate.cliprect_enabled) {
data->glEnable(GL_SCISSOR_TEST);
} else {
data->glDisable(GL_SCISSOR_TEST);
}
data->drawstate.cliprect_enabled_dirty = SDL_FALSE;
}
if (data->drawstate.cliprect_enabled && data->drawstate.cliprect_dirty) {
const SDL_Rect *viewport = &data->drawstate.viewport;
const SDL_Rect *rect = &data->drawstate.cliprect;
const SDL_bool istarget = (data->drawstate.target != NULL);
data->glScissor(viewport->x + rect->x,
istarget ? viewport->y + rect->y : data->drawstate.drawableh - viewport->y - rect->y - rect->h,
rect->w, rect->h);
data->drawstate.cliprect_dirty = SDL_FALSE;
}
759
760
if (blend != data->drawstate.blend) {
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
if (blend == SDL_BLENDMODE_NONE) {
data->glDisable(GL_BLEND);
} else {
data->glEnable(GL_BLEND);
if (data->GL_OES_blend_func_separate_supported) {
data->glBlendFuncSeparateOES(GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blend)),
GetBlendFunc(SDL_GetBlendModeDstColorFactor(blend)),
GetBlendFunc(SDL_GetBlendModeSrcAlphaFactor(blend)),
GetBlendFunc(SDL_GetBlendModeDstAlphaFactor(blend)));
} else {
data->glBlendFunc(GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blend)),
GetBlendFunc(SDL_GetBlendModeDstColorFactor(blend)));
}
if (data->GL_OES_blend_equation_separate_supported) {
data->glBlendEquationSeparateOES(GetBlendEquation(SDL_GetBlendModeColorOperation(blend)),
GetBlendEquation(SDL_GetBlendModeAlphaOperation(blend)));
} else if (data->GL_OES_blend_subtract_supported) {
data->glBlendEquationOES(GetBlendEquation(SDL_GetBlendModeColorOperation(blend)));
}
}
781
data->drawstate.blend = blend;
782
783
}
784
if ((cmd->data.draw.texture != NULL) != data->drawstate.texturing) {
785
786
787
if (cmd->data.draw.texture == NULL) {
data->glDisable(GL_TEXTURE_2D);
data->glDisableClientState(GL_TEXTURE_COORD_ARRAY);
788
data->drawstate.texturing = SDL_FALSE;
789
790
791
} else {
data->glEnable(GL_TEXTURE_2D);
data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);
792
data->drawstate.texturing = SDL_TRUE;
793
794
795
796
797
}
}
}
static void
798
SetCopyState(GLES_RenderData *data, const SDL_RenderCommand *cmd)
799
800
{
SDL_Texture *texture = cmd->data.draw.texture;
801
SetDrawState(data, cmd);
802
803
if (texture != data->drawstate.texture) {
804
805
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
data->glBindTexture(GL_TEXTURE_2D, texturedata->texture);
806
data->drawstate.texture = texture;
807
808
809
810
811
812
813
814
815
816
817
818
819
}
}
static int
GLES_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
size_t i;
if (GLES_ActivateRenderer(renderer) < 0) {
return -1;
}
820
821
822
823
data->drawstate.target = renderer->target;
if (!renderer->target) {
SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
824
825
826
827
828
}
while (cmd) {
switch (cmd->command) {
case SDL_RENDERCMD_SETDRAWCOLOR: {
829
break; /* not used in this render backend. */
830
831
832
}
case SDL_RENDERCMD_SETVIEWPORT: {
833
834
835
SDL_Rect *viewport = &data->drawstate.viewport;
if (SDL_memcmp(viewport, &cmd->data.viewport.rect, sizeof (SDL_Rect)) != 0) {
SDL_memcpy(viewport, &cmd->data.viewport.rect, sizeof (SDL_Rect));
836
data->drawstate.viewport_dirty = SDL_TRUE;
837
}
838
839
840
841
842
break;
}
case SDL_RENDERCMD_SETCLIPRECT: {
const SDL_Rect *rect = &cmd->data.cliprect.rect;
843
844
if (data->drawstate.cliprect_enabled != cmd->data.cliprect.enabled) {
data->drawstate.cliprect_enabled = cmd->data.cliprect.enabled;
845
846
847
848
849
data->drawstate.cliprect_enabled_dirty = SDL_TRUE;
}
if (SDL_memcmp(&data->drawstate.cliprect, rect, sizeof (SDL_Rect)) != 0) {
SDL_memcpy(&data->drawstate.cliprect, rect, sizeof (SDL_Rect));
data->drawstate.cliprect_dirty = SDL_TRUE;
850
851
852
853
854
}
break;
}
case SDL_RENDERCMD_CLEAR: {
855
856
857
858
859
860
861
862
863
864
865
866
867
const Uint8 r = cmd->data.color.r;
const Uint8 g = cmd->data.color.g;
const Uint8 b = cmd->data.color.b;
const Uint8 a = cmd->data.color.a;
const Uint32 color = ((a << 24) | (r << 16) | (g << 8) | b);
if (color != data->drawstate.clear_color) {
const GLfloat fr = ((GLfloat) r) * inv255f;
const GLfloat fg = ((GLfloat) g) * inv255f;
const GLfloat fb = ((GLfloat) b) * inv255f;
const GLfloat fa = ((GLfloat) a) * inv255f;
data->glClearColor(fr, fg, fb, fa);
data->drawstate.clear_color = color;
}
868
869
if (data->drawstate.cliprect_enabled) {
870
data->glDisable(GL_SCISSOR_TEST);
871
data->drawstate.cliprect_enabled_dirty = SDL_TRUE;
872
873
874
875
876
877
878
879
880
881
}
data->glClear(GL_COLOR_BUFFER_BIT);
break;
}
case SDL_RENDERCMD_DRAW_POINTS: {
const size_t count = cmd->data.draw.count;
const GLfloat *verts = (GLfloat *) (((Uint8 *) vertices) + cmd->data.draw.first);
882
SetDrawState(data, cmd);
883
data->glVertexPointer(2, GL_FLOAT, 0, verts);
884
data->glDrawArrays(GL_POINTS, 0, (GLsizei) count);
885
886
887
888
889
break;
}
case SDL_RENDERCMD_DRAW_LINES: {
const GLfloat *verts = (GLfloat *) (((Uint8 *) vertices) + cmd->data.draw.first);
890
const size_t count = cmd->data.draw.count;
891
SetDrawState(data, cmd);
892
data->glVertexPointer(2, GL_FLOAT, 0, verts);
893
if (count > 2 && (verts[0] == verts[(count-1)*2]) && (verts[1] == verts[(count*2)-1])) {
894
/* GL_LINE_LOOP takes care of the final segment */
895
data->glDrawArrays(GL_LINE_LOOP, 0, (GLsizei) (count - 1));
896
} else {
897
data->glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) count);
898
/* We need to close the endpoint of the line */
899
data->glDrawArrays(GL_POINTS, (GLsizei) (count - 1), 1);
900
901
902
903
904
905
906
}
break;
}
case SDL_RENDERCMD_FILL_RECTS: {
const size_t count = cmd->data.draw.count;
const GLfloat *verts = (GLfloat *) (((Uint8 *) vertices) + cmd->data.draw.first);
907
GLsizei offset = 0;
908
SetDrawState(data, cmd);
909
910
911
912
913
914
915
916
917
data->glVertexPointer(2, GL_FLOAT, 0, verts);
for (i = 0; i < count; ++i, offset += 4) {
data->glDrawArrays(GL_TRIANGLE_STRIP, offset, 4);
}
break;
}
case SDL_RENDERCMD_COPY: {
const GLfloat *verts = (GLfloat *) (((Uint8 *) vertices) + cmd->data.draw.first);
918
SetCopyState(data, cmd);
919
920
921
922
923
924
925
926
927
928
929
data->glVertexPointer(2, GL_FLOAT, 0, verts);
data->glTexCoordPointer(2, GL_FLOAT, 0, verts + 8);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
break;
}
case SDL_RENDERCMD_COPY_EX: {
const GLfloat *verts = (GLfloat *) (((Uint8 *) vertices) + cmd->data.draw.first);
const GLfloat translatex = verts[16];
const GLfloat translatey = verts[17];
const GLfloat angle = verts[18];
930
SetCopyState(data, cmd);
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
data->glVertexPointer(2, GL_FLOAT, 0, verts);
data->glTexCoordPointer(2, GL_FLOAT, 0, verts + 8);
/* Translate to flip, rotate, translate to position */
data->glPushMatrix();
data->glTranslatef(translatex, translatey, 0.0f);
data->glRotatef(angle, 0.0, 0.0, 1.0);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
data->glPopMatrix();
break;
}
case SDL_RENDERCMD_NO_OP:
break;
}
cmd = cmd->next;
}
950
return 0;
951
952
}
953
954
static int
GLES_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
955
Uint32 pixel_format, void * pixels, int pitch)
956
957
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
958
Uint32 temp_format = renderer->target ? renderer->target->format : SDL_PIXELFORMAT_ABGR8888;
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
void *temp_pixels;
int temp_pitch;
Uint8 *src, *dst, *tmp;
int w, h, length, rows;
int status;
GLES_ActivateRenderer(renderer);
temp_pitch = rect->w * SDL_BYTESPERPIXEL(temp_format);
temp_pixels = SDL_malloc(rect->h * temp_pitch);
if (!temp_pixels) {
return SDL_OutOfMemory();
}
SDL_GetRendererOutputSize(renderer, &w, &h);
data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
977
978
979
980
981
data->glReadPixels(rect->x, renderer->target ? rect->y : (h-rect->y)-rect->h,
rect->w, rect->h, GL_RGBA, GL_UNSIGNED_BYTE, temp_pixels);
/* Flip the rows to be top-down if necessary */
if (!renderer->target) {
982
SDL_bool isstack;
983
984
985
length = rect->w * SDL_BYTESPERPIXEL(temp_format);
src = (Uint8*)temp_pixels + (rect->h-1)*temp_pitch;
dst = (Uint8*)temp_pixels;
986
tmp = SDL_small_alloc(Uint8, length, &isstack);
987
988
989
990
991
992
993
994
rows = rect->h / 2;
while (rows--) {
SDL_memcpy(tmp, dst, length);
SDL_memcpy(dst, src, length);
SDL_memcpy(src, tmp, length);
dst += temp_pitch;
src -= temp_pitch;
}
995
SDL_small_free(tmp, isstack);
996
997
998
999
1000
}
status = SDL_ConvertPixels(rect->w, rect->h,
temp_format, temp_pixels, temp_pitch,
pixel_format, pixels, pitch);