This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_render_gl.c
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
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"
24
#if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED
25
26
#include "SDL_opengl.h"
27
#include "../SDL_sysrender.h"
29
30
31
32
#ifdef __MACOSX__
#include <OpenGL/OpenGL.h>
#endif
34
35
/* OpenGL renderer implementation */
36
/* Details on optimizing the texture path on Mac OS X:
37
http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/opengl_texturedata.html
40
41
/* Used to re-create the window with OpenGL capability */
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
43
44
static const float inv255f = 1.0f / 255.0f;
45
static SDL_Renderer *GL_CreateRenderer(SDL_Window * window, Uint32 flags);
46
47
static void GL_WindowEvent(SDL_Renderer * renderer,
const SDL_WindowEvent *event);
48
49
50
51
52
static int GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
static int GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
53
const SDL_Rect * rect, void **pixels, int *pitch);
54
static void GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
55
static void GL_SetClipRect(SDL_Renderer * renderer, const SDL_Rect * rect);
56
57
58
59
60
61
62
static int GL_RenderClear(SDL_Renderer * renderer);
static int GL_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int GL_RenderDrawLines(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int GL_RenderFillRects(SDL_Renderer * renderer,
const SDL_Rect ** rects, int count);
63
static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
64
const SDL_Rect * srcrect, const SDL_Rect * dstrect);
65
static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
66
Uint32 pixel_format, void * pixels, int pitch);
67
68
69
70
71
72
73
74
75
static void GL_RenderPresent(SDL_Renderer * renderer);
static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void GL_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver GL_RenderDriver = {
GL_CreateRenderer,
{
"opengl",
76
(SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
77
78
1,
{SDL_PIXELFORMAT_ARGB8888},
79
80
81
82
83
84
85
0,
0}
};
typedef struct
{
SDL_GLContext context;
86
SDL_bool updateSize;
87
SDL_bool GL_ARB_texture_rectangle_supported;
88
89
90
91
int blendMode;
/* OpenGL functions */
#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
92
#include "SDL_glfuncs.h"
93
#undef SDL_PROC
95
96
void (*glTextureRangeAPPLE) (GLenum target, GLsizei length,
const GLvoid * pointer);
97
98
99
100
101
} GL_RenderData;
typedef struct
{
GLuint texture;
103
104
GLfloat texw;
GLfloat texh;
105
106
GLenum format;
GLenum formattype;
107
108
void *pixels;
int pitch;
109
SDL_Rect locked_rect;
110
111
112
} GL_TextureData;
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
static void
GL_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;
case GL_TABLE_TOO_LARGE:
error = "GL_TABLE_TOO_LARGE";
break;
default:
error = "UNKNOWN";
break;
}
SDL_SetError("%s: %s", prefix, error);
}
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
static int
GL_LoadFunctions(GL_RenderData * data)
{
#ifdef __SDL_NOGETPROCADDR__
#define SDL_PROC(ret,func,params) data->func=func;
#else
#define SDL_PROC(ret,func,params) \
do { \
data->func = SDL_GL_GetProcAddress(#func); \
if ( ! data->func ) { \
SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \
return -1; \
} \
} while ( 0 );
#endif /* __SDL_NOGETPROCADDR__ */
166
#include "SDL_glfuncs.h"
167
168
169
170
#undef SDL_PROC
return 0;
}
171
172
173
174
175
SDL_Renderer *
GL_CreateRenderer(SDL_Window * window, Uint32 flags)
{
SDL_Renderer *renderer;
GL_RenderData *data;
176
GLint value;
177
Uint32 window_flags;
179
180
181
window_flags = SDL_GetWindowFlags(window);
if (!(window_flags & SDL_WINDOW_OPENGL)) {
if (SDL_RecreateWindow(window, window_flags | SDL_WINDOW_OPENGL) < 0) {
182
183
return NULL;
}
186
renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
187
188
189
190
191
if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
192
data = (GL_RenderData *) SDL_calloc(1, sizeof(*data));
193
194
195
196
197
198
if (!data) {
GL_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
199
renderer->WindowEvent = GL_WindowEvent;
200
201
202
203
renderer->CreateTexture = GL_CreateTexture;
renderer->UpdateTexture = GL_UpdateTexture;
renderer->LockTexture = GL_LockTexture;
renderer->UnlockTexture = GL_UnlockTexture;
204
renderer->SetClipRect = GL_SetClipRect;
205
206
207
208
renderer->RenderClear = GL_RenderClear;
renderer->RenderDrawPoints = GL_RenderDrawPoints;
renderer->RenderDrawLines = GL_RenderDrawLines;
renderer->RenderFillRects = GL_RenderFillRects;
209
renderer->RenderCopy = GL_RenderCopy;
210
renderer->RenderReadPixels = GL_RenderReadPixels;
211
212
213
214
215
216
renderer->RenderPresent = GL_RenderPresent;
renderer->DestroyTexture = GL_DestroyTexture;
renderer->DestroyRenderer = GL_DestroyRenderer;
renderer->info = GL_RenderDriver.info;
renderer->driverdata = data;
217
renderer->info.flags = SDL_RENDERER_ACCELERATED;
219
data->context = SDL_GL_CreateContext(window);
220
221
222
223
if (!data->context) {
GL_DestroyRenderer(renderer);
return NULL;
}
224
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
225
226
227
GL_DestroyRenderer(renderer);
return NULL;
}
228
229
230
231
232
233
if (GL_LoadFunctions(data) < 0) {
GL_DestroyRenderer(renderer);
return NULL;
}
234
235
236
#ifdef __MACOSX__
/* Enable multi-threaded rendering */
/* Disabled until Ryan finishes his VBO/PBO code...
237
238
CGLEnable(CGLGetCurrentContext(), kCGLCEMPEngine);
*/
241
if (flags & SDL_RENDERER_PRESENTVSYNC) {
242
243
244
245
246
SDL_GL_SetSwapInterval(1);
} else {
SDL_GL_SetSwapInterval(0);
}
if (SDL_GL_GetSwapInterval() > 0) {
247
renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
250
251
252
253
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;
255
256
257
258
if (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle")
|| SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {
data->GL_ARB_texture_rectangle_supported = SDL_TRUE;
}
259
260
261
262
263
if (SDL_GL_ExtensionSupported("GL_APPLE_texture_range")) {
data->glTextureRangeAPPLE =
(void (*)(GLenum, GLsizei, const GLvoid *))
SDL_GL_GetProcAddress("glTextureRangeAPPLE");
}
265
/* Set up parameters for rendering */
266
267
268
data->blendMode = -1;
data->glDisable(GL_DEPTH_TEST);
data->glDisable(GL_CULL_FACE);
269
270
/* This ended up causing video discrepancies between OpenGL and Direct3D */
/*data->glEnable(GL_LINE_SMOOTH);*/
271
if (data->GL_ARB_texture_rectangle_supported) {
272
data->glEnable(GL_TEXTURE_RECTANGLE_ARB);
273
} else {
274
data->glEnable(GL_TEXTURE_2D);
276
data->updateSize = SDL_TRUE;
277
278
279
280
return renderer;
}
281
282
static SDL_GLContext SDL_CurrentContext = NULL;
283
284
285
286
static int
GL_ActivateRenderer(SDL_Renderer * renderer)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
287
SDL_Window *window = renderer->window;
289
290
291
292
293
if (SDL_CurrentContext != data->context) {
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
return -1;
}
SDL_CurrentContext = data->context;
295
if (data->updateSize) {
296
297
298
int w, h;
SDL_GetWindowSize(window, &w, &h);
299
300
301
302
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glMatrixMode(GL_MODELVIEW);
data->glLoadIdentity();
303
304
data->glViewport(0, 0, w, h);
data->glOrtho(0.0, (GLdouble) w, (GLdouble) h, 0.0, 0.0, 1.0);
305
306
data->updateSize = SDL_FALSE;
}
307
308
309
return 0;
}
310
311
static void
GL_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
312
313
314
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
315
316
317
318
319
if (event->event == SDL_WINDOWEVENT_RESIZED) {
/* Rebind the context to the window area and update matrices */
SDL_CurrentContext = NULL;
data->updateSize = SDL_TRUE;
}
322
323
324
325
326
327
328
329
330
331
332
static __inline__ int
power_of_2(int input)
{
int value = 1;
while (value < input) {
value <<= 1;
}
return value;
}
333
334
335
static __inline__ SDL_bool
convert_format(GL_RenderData *renderdata, Uint32 pixel_format,
GLint* internalFormat, GLenum* format, GLenum* type)
337
switch (pixel_format) {
338
case SDL_PIXELFORMAT_ARGB8888:
339
340
*internalFormat = GL_RGBA8;
*format = GL_BGRA;
341
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
return SDL_FALSE;
}
return SDL_TRUE;
}
static int
GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
GL_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum result;
359
360
GL_ActivateRenderer(renderer);
361
362
if (!convert_format(renderdata, texture->format, &internalFormat,
&format, &type)) {
363
364
SDL_SetError("Texture format %s not supported by OpenGL",
SDL_GetPixelFormatName(texture->format));
365
366
return -1;
}
368
data = (GL_TextureData *) SDL_calloc(1, sizeof(*data));
369
370
371
372
373
if (!data) {
SDL_OutOfMemory();
return -1;
}
374
if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
375
data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
376
377
378
379
380
381
382
383
data->pixels = SDL_malloc(texture->h * data->pitch);
if (!data->pixels) {
SDL_OutOfMemory();
SDL_free(data);
return -1;
}
}
384
385
texture->driverdata = data;
386
387
renderdata->glGetError();
renderdata->glGenTextures(1, &data->texture);
388
389
390
391
if (renderdata->GL_ARB_texture_rectangle_supported) {
data->type = GL_TEXTURE_RECTANGLE_ARB;
texture_w = texture->w;
texture_h = texture->h;
392
393
data->texw = (GLfloat) texture_w;
data->texh = (GLfloat) texture_h;
394
395
396
397
} else {
data->type = GL_TEXTURE_2D;
texture_w = power_of_2(texture->w);
texture_h = power_of_2(texture->h);
398
data->texw = (GLfloat) (texture->w) / texture_w;
399
400
data->texh = (GLfloat) texture->h / texture_h;
}
402
403
data->format = format;
data->formattype = type;
404
renderdata->glEnable(data->type);
405
renderdata->glBindTexture(data->type, data->texture);
406
renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,
408
renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,
410
411
412
413
renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S,
GL_CLAMP_TO_EDGE);
renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T,
GL_CLAMP_TO_EDGE);
414
#ifdef __MACOSX__
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
#ifndef GL_TEXTURE_STORAGE_HINT_APPLE
#define GL_TEXTURE_STORAGE_HINT_APPLE 0x85BC
#endif
#ifndef STORAGE_CACHED_APPLE
#define STORAGE_CACHED_APPLE 0x85BE
#endif
#ifndef STORAGE_SHARED_APPLE
#define STORAGE_SHARED_APPLE 0x85BF
#endif
if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
renderdata->glTexParameteri(data->type, GL_TEXTURE_STORAGE_HINT_APPLE,
GL_STORAGE_SHARED_APPLE);
} else {
renderdata->glTexParameteri(data->type, GL_TEXTURE_STORAGE_HINT_APPLE,
GL_STORAGE_CACHED_APPLE);
}
431
432
if (texture->access == SDL_TEXTUREACCESS_STREAMING
&& texture->format == SDL_PIXELFORMAT_ARGB8888) {
433
434
435
renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
texture_h, 0, format, type, data->pixels);
438
439
440
441
442
#endif
{
renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
texture_h, 0, format, type, NULL);
}
443
renderdata->glDisable(data->type);
444
result = renderdata->glGetError();
445
446
447
448
if (result != GL_NO_ERROR) {
GL_SetError("glTexImage2D()", result);
return -1;
}
449
450
451
452
453
454
455
return 0;
}
static int
GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
{
456
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
457
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
458
GLenum result;
460
461
GL_ActivateRenderer(renderer);
462
renderdata->glGetError();
463
464
465
renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,
(pitch / SDL_BYTESPERPIXEL(texture->format)));
466
renderdata->glEnable(data->type);
467
468
469
470
renderdata->glBindTexture(data->type, data->texture);
renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
rect->h, data->format, data->formattype,
pixels);
471
renderdata->glDisable(data->type);
472
result = renderdata->glGetError();
473
474
475
476
if (result != GL_NO_ERROR) {
GL_SetError("glTexSubImage2D()", result);
return -1;
}
477
478
479
480
481
return 0;
}
static int
GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
482
const SDL_Rect * rect, void **pixels, int *pitch)
483
484
485
{
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
486
487
data->locked_rect = *rect;
*pixels =
488
(void *) ((Uint8 *) data->pixels + rect->y * data->pitch +
489
rect->x * SDL_BYTESPERPIXEL(texture->format));
490
*pitch = data->pitch;
491
492
493
494
495
496
497
return 0;
}
static void
GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
498
499
const SDL_Rect *rect;
void *pixels;
501
502
503
504
505
rect = &data->locked_rect;
pixels =
(void *) ((Uint8 *) data->pixels + rect->y * data->pitch +
rect->x * SDL_BYTESPERPIXEL(texture->format));
GL_UpdateTexture(renderer, texture, rect, pixels, data->pitch);
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
static void
GL_SetClipRect(SDL_Renderer * renderer, const SDL_Rect * rect)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
GL_ActivateRenderer(renderer);
if (rect) {
int w, h;
SDL_GetWindowSize(renderer->window, &w, &h);
data->glScissor(rect->x, (h-(rect->y+rect->h)), rect->w, rect->h);
data->glEnable(GL_SCISSOR_TEST);
} else {
data->glDisable(GL_SCISSOR_TEST);
}
}
527
GL_SetBlendMode(GL_RenderData * data, int blendMode)
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
{
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;
545
546
547
548
549
case SDL_BLENDMODE_MOD:
data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
data->glEnable(GL_BLEND);
data->glBlendFunc(GL_ZERO, GL_SRC_COLOR);
break;
550
551
552
553
554
}
data->blendMode = blendMode;
}
}
555
static int
556
557
558
559
GL_RenderClear(SDL_Renderer * renderer)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
560
561
GL_ActivateRenderer(renderer);
562
563
564
565
566
567
568
569
570
571
572
573
574
data->glClearColor((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
data->glClear(GL_COLOR_BUFFER_BIT);
return 0;
}
static int
GL_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
575
576
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
579
580
GL_ActivateRenderer(renderer);
581
GL_SetBlendMode(data, renderer->blendMode);
583
584
585
586
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
587
588
data->glBegin(GL_POINTS);
589
590
591
for (i = 0; i < count; ++i) {
data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
}
592
data->glEnd();
593
594
595
596
return 0;
}
597
static int
598
599
GL_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
600
601
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
604
605
GL_ActivateRenderer(renderer);
606
GL_SetBlendMode(data, renderer->blendMode);
607
608
609
610
611
612
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
613
614
615
616
617
618
619
620
621
622
if (count > 2 &&
points[0].x == points[count-1].x && points[0].y == points[count-1].y) {
data->glBegin(GL_LINE_LOOP);
/* GL_LINE_LOOP takes care of the final segment */
--count;
for (i = 0; i < count; ++i) {
data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
}
data->glEnd();
} else {
623
#if defined(__APPLE__) || defined(__WIN32__)
625
int x1, y1, x2, y2;
628
629
630
631
632
633
634
635
636
637
638
639
640
641
data->glBegin(GL_LINE_STRIP);
for (i = 0; i < count; ++i) {
data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
}
data->glEnd();
/* The line is half open, so we need one more point to complete it.
* http://www.opengl.org/documentation/specs/version1.1/glspec1.1/node47.html
* If we have to, we can use vertical line and horizontal line textures
* for vertical and horizontal lines, and then create custom textures
* for diagonal lines and software render those. It's terrible, but at
* least it would be pixel perfect.
*/
data->glBegin(GL_POINTS);
642
#if defined(__APPLE__) || defined(__WIN32__)
643
644
/* Mac OS X and Windows seem to always leave the second point open */
data->glVertex2f(0.5f + points[count-1].x, 0.5f + points[count-1].y);
646
/* Linux seems to leave the right-most or bottom-most point open */
647
648
649
650
x1 = points[0].x;
y1 = points[0].y;
x2 = points[count-1].x;
y2 = points[count-1].y;
651
652
653
654
655
656
657
658
659
660
if (x1 > x2) {
data->glVertex2f(0.5f + x1, 0.5f + y1);
} else if (x2 > x1) {
data->glVertex2f(0.5f + x2, 0.5f + y2);
} else if (y1 > y2) {
data->glVertex2f(0.5f + x1, 0.5f + y1);
} else if (y2 > y1) {
data->glVertex2f(0.5f + x2, 0.5f + y2);
}
662
663
data->glEnd();
}
665
666
667
return 0;
}
668
669
static int
GL_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects, int count)
670
671
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
674
675
GL_ActivateRenderer(renderer);
676
GL_SetBlendMode(data, renderer->blendMode);
678
679
680
681
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
683
684
685
686
687
for (i = 0; i < count; ++i) {
const SDL_Rect *rect = rects[i];
data->glRecti(rect->x, rect->y, rect->x + rect->w, rect->y + rect->h);
}
689
690
691
692
693
return 0;
}
static int
GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
694
const SDL_Rect * srcrect, const SDL_Rect * dstrect)
695
696
697
698
699
700
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;
int minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
701
702
GL_ActivateRenderer(renderer);
703
704
705
706
707
708
minx = dstrect->x;
miny = dstrect->y;
maxx = dstrect->x + dstrect->w;
maxy = dstrect->y + dstrect->h;
minu = (GLfloat) srcrect->x / texture->w;
709
minu *= texturedata->texw;
710
maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;
711
maxu *= texturedata->texw;
712
minv = (GLfloat) srcrect->y / texture->h;
713
minv *= texturedata->texh;
714
maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;
715
maxv *= texturedata->texh;
717
data->glEnable(texturedata->type);
718
719
data->glBindTexture(texturedata->type, texturedata->texture);
720
721
722
723
724
725
726
727
728
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);
}
729
GL_SetBlendMode(data, texture->blendMode);
731
732
data->glBegin(GL_TRIANGLE_STRIP);
data->glTexCoord2f(minu, minv);
733
data->glVertex2f((GLfloat) minx, (GLfloat) miny);
734
data->glTexCoord2f(maxu, minv);
735
data->glVertex2f((GLfloat) maxx, (GLfloat) miny);
736
data->glTexCoord2f(minu, maxv);
737
data->glVertex2f((GLfloat) minx, (GLfloat) maxy);
738
data->glTexCoord2f(maxu, maxv);
739
data->glVertex2f((GLfloat) maxx, (GLfloat) maxy);
740
data->glEnd();
742
743
data->glDisable(texturedata->type);
744
745
746
return 0;
}
747
748
static int
GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
749
Uint32 pixel_format, void * pixels, int pitch)
751
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
752
SDL_Window *window = renderer->window;
753
754
GLint internalFormat;
GLenum format, type;
755
Uint8 *src, *dst, *tmp;
756
int w, h, length, rows;
758
759
GL_ActivateRenderer(renderer);
760
if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
761
/* FIXME: Do a temp copy to a format that is supported */
762
763
764
765
SDL_SetError("Unsupported pixel format");
return -1;
}
766
767
SDL_GetWindowSize(window, &w, &h);
768
769
data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
data->glPixelStorei(GL_PACK_ROW_LENGTH,
770
(pitch / SDL_BYTESPERPIXEL(pixel_format)));
772
data->glReadPixels(rect->x, (h-rect->y)-rect->h, rect->w, rect->h,
773
774
775
format, type, pixels);
/* Flip the rows to be top-down */
776
length = rect->w * SDL_BYTESPERPIXEL(pixel_format);
777
778
779
780
781
782
783
784
src = (Uint8*)pixels + (rect->h-1)*pitch;
dst = (Uint8*)pixels;
tmp = SDL_stack_alloc(Uint8, length);
rows = rect->h / 2;
while (rows--) {
SDL_memcpy(tmp, dst, length);
SDL_memcpy(dst, src, length);
SDL_memcpy(src, tmp, length);
785
786
dst += pitch;
src -= pitch;
787
788
}
SDL_stack_free(tmp);
789
790
return 0;
793
794
795
static void
GL_RenderPresent(SDL_Renderer * renderer)
{
796
797
GL_ActivateRenderer(renderer);
798
799
800
801
802
803
SDL_GL_SwapWindow(renderer->window);
}
static void
GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
804
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
805
806
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
807
808
GL_ActivateRenderer(renderer);
809
810
811
812
if (!data) {
return;
}
if (data->texture) {
813
renderdata->glDeleteTextures(1, &data->texture);
814
815
816
}
if (data->pixels) {
SDL_free(data->pixels);
817
818
819
820
821
}
SDL_free(data);
texture->driverdata = NULL;
}
822
static void
823
824
825
826
827
GL_DestroyRenderer(SDL_Renderer * renderer)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
if (data) {
828
if (data->context) {
829
/* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */
830
SDL_GL_DeleteContext(data->context);
831
832
833
834
835
836
}
SDL_free(data);
}
SDL_free(renderer);
}
837
#endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
838
839
/* vi: set ts=4 sw=4 expandtab: */