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[mesa.git] / src / egl / main / eglconfig.c
1 /**
2 * EGL Configuration (pixel format) functions.
3 */
4
5
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 #include <assert.h>
10 #include "eglconfig.h"
11 #include "egldisplay.h"
12 #include "egldriver.h"
13 #include "eglglobals.h"
14
15
16 #define MIN2(A, B) (((A) < (B)) ? (A) : (B))
17
18
19 /**
20 * Convert an _EGLConfig to a __GLcontextModes object.
21 */
22 static void
23 _eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode)
24 {
25 memset(mode, 0, sizeof(*mode));
26
27 mode->rgbMode = GL_TRUE; /* no color index */
28 mode->colorIndexMode = GL_FALSE;
29 mode->doubleBufferMode = GL_TRUE;
30 mode->stereoMode = GL_FALSE;
31
32 mode->redBits = GET_CONFIG_ATTRIB(config, EGL_RED_SIZE);
33 mode->greenBits = GET_CONFIG_ATTRIB(config, EGL_GREEN_SIZE);
34 mode->blueBits = GET_CONFIG_ATTRIB(config, EGL_BLUE_SIZE);
35 mode->alphaBits = GET_CONFIG_ATTRIB(config, EGL_ALPHA_SIZE);
36 mode->rgbBits = mode->redBits + mode->greenBits
37 + mode->blueBits + mode->alphaBits;
38
39 mode->depthBits = GET_CONFIG_ATTRIB(config, EGL_DEPTH_SIZE);
40 mode->haveDepthBuffer = mode->depthBits > 0;
41
42 mode->stencilBits = GET_CONFIG_ATTRIB(config, EGL_STENCIL_SIZE);
43 mode->haveStencilBuffer = mode->stencilBits > 0;
44
45 mode->level = GET_CONFIG_ATTRIB(config, EGL_LEVEL);
46 mode->samples = GET_CONFIG_ATTRIB(config, EGL_SAMPLES);
47 mode->sampleBuffers = GET_CONFIG_ATTRIB(config, EGL_SAMPLE_BUFFERS);
48 }
49
50
51
52 void
53 _eglSetConfigAttrib(_EGLConfig *config, EGLint attr, EGLint val)
54 {
55 config->Attrib[attr - FIRST_ATTRIB] = val;
56
57 switch (attr) {
58 case EGL_BUFFER_SIZE:
59 config->glmode.rgbBits = val;
60 break;
61 case EGL_ALPHA_SIZE:
62 config->glmode.alphaBits = val;
63 break;
64 case EGL_BLUE_SIZE:
65 config->glmode.blueBits = val;
66 break;
67 case EGL_GREEN_SIZE:
68 config->glmode.greenBits = val;
69 break;
70 case EGL_RED_SIZE:
71 config->glmode.redBits = val;
72 break;
73 case EGL_DEPTH_SIZE:
74 config->glmode.depthBits = val;
75 break;
76 case EGL_STENCIL_SIZE:
77 config->glmode.stencilBits = val;
78 break;
79 case EGL_CONFIG_CAVEAT:
80 break;
81 case EGL_CONFIG_ID:
82 break;
83 case EGL_LEVEL:
84 break;
85 case EGL_MAX_PBUFFER_HEIGHT:
86 break;
87 case EGL_MAX_PBUFFER_PIXELS:
88 break;
89 case EGL_MAX_PBUFFER_WIDTH:
90 break;
91 case EGL_NATIVE_RENDERABLE:
92 break;
93 case EGL_NATIVE_VISUAL_ID:
94 break;
95 case EGL_NATIVE_VISUAL_TYPE:
96 break;
97 case EGL_SAMPLES:
98 break;
99 case EGL_SAMPLE_BUFFERS:
100 break;
101 case EGL_SURFACE_TYPE:
102 config->glmode.drawableType = val;
103 break;
104 case EGL_TRANSPARENT_TYPE:
105 break;
106 case EGL_TRANSPARENT_BLUE_VALUE:
107 break;
108 case EGL_TRANSPARENT_GREEN_VALUE:
109 break;
110 case EGL_TRANSPARENT_RED_VALUE:
111 break;
112 case EGL_NONE:
113 break;
114 case EGL_BIND_TO_TEXTURE_RGB:
115 break;
116 case EGL_BIND_TO_TEXTURE_RGBA:
117 break;
118 case EGL_MIN_SWAP_INTERVAL:
119 break;
120 case EGL_MAX_SWAP_INTERVAL:
121 break;
122 default:
123 break;
124 }
125 }
126
127
128 /**
129 * Init the given _EGLconfig to default values.
130 * \param id the configuration's ID.
131 */
132 void
133 _eglInitConfig(_EGLConfig *config, EGLint id)
134 {
135 memset(config, 0, sizeof(*config));
136 config->Handle = id;
137 _eglSetConfigAttrib(config, EGL_CONFIG_ID, id);
138 _eglSetConfigAttrib(config, EGL_BIND_TO_TEXTURE_RGB, EGL_DONT_CARE);
139 _eglSetConfigAttrib(config, EGL_BIND_TO_TEXTURE_RGBA, EGL_DONT_CARE);
140 _eglSetConfigAttrib(config, EGL_CONFIG_CAVEAT, EGL_DONT_CARE);
141 _eglSetConfigAttrib(config, EGL_NATIVE_RENDERABLE, EGL_DONT_CARE);
142 _eglSetConfigAttrib(config, EGL_NATIVE_VISUAL_TYPE, EGL_DONT_CARE);
143 _eglSetConfigAttrib(config, EGL_MIN_SWAP_INTERVAL, EGL_DONT_CARE);
144 _eglSetConfigAttrib(config, EGL_MAX_SWAP_INTERVAL, EGL_DONT_CARE);
145 _eglSetConfigAttrib(config, EGL_SURFACE_TYPE,
146 EGL_SCREEN_BIT_MESA | EGL_PBUFFER_BIT |
147 EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
148 _eglSetConfigAttrib(config, EGL_TRANSPARENT_TYPE, EGL_NONE);
149 _eglSetConfigAttrib(config, EGL_TRANSPARENT_RED_VALUE, EGL_DONT_CARE);
150 _eglSetConfigAttrib(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE);
151 _eglSetConfigAttrib(config, EGL_TRANSPARENT_BLUE_VALUE, EGL_DONT_CARE);
152 }
153
154
155 /**
156 * Given an EGLConfig handle, return the corresponding _EGLConfig object.
157 */
158 _EGLConfig *
159 _eglLookupConfig(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config)
160 {
161 EGLint i;
162 _EGLDisplay *disp = _eglLookupDisplay(dpy);
163 for (i = 0; i < disp->NumConfigs; i++) {
164 if (disp->Configs[i].Handle == config) {
165 return disp->Configs + i;
166 }
167 }
168 return NULL;
169 }
170
171
172 /**
173 * Add the given _EGLConifg to the given display.
174 */
175 _EGLConfig *
176 _eglAddConfig(_EGLDisplay *display, const _EGLConfig *config)
177 {
178 _EGLConfig *newConfigs;
179 EGLint n;
180
181 n = display->NumConfigs;
182
183 newConfigs = (_EGLConfig *) realloc(display->Configs,
184 (n + 1) * sizeof(_EGLConfig));
185 if (newConfigs) {
186 display->Configs = newConfigs;
187 display->Configs[n] = *config; /* copy struct */
188 display->Configs[n].Handle = n;
189 display->NumConfigs++;
190 return display->Configs + n;
191 }
192 else {
193 return NULL;
194 }
195 }
196
197
198 /**
199 * Parse the attrib_list to fill in the fields of the given _egl_config
200 * Return EGL_FALSE if any errors, EGL_TRUE otherwise.
201 */
202 EGLBoolean
203 _eglParseConfigAttribs(_EGLConfig *config, const EGLint *attrib_list)
204 {
205 EGLint i;
206
207 /* XXX set all config attribs to EGL_DONT_CARE */
208
209 for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
210 EGLint k = attrib_list[i] - FIRST_ATTRIB;
211 if (k >= 0 && k < MAX_ATTRIBS) {
212 config->Attrib[k] = attrib_list[++i];
213 }
214 else {
215 _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig");
216 return EGL_FALSE;
217 }
218 }
219 return EGL_TRUE;
220 }
221
222
223 #define EXACT 1
224 #define ATLEAST 2
225 #define MASK 3
226 #define SMALLER 4
227 #define SPECIAL 5
228 #define NONE 6
229
230 struct sort_info {
231 EGLint Attribute;
232 EGLint MatchCriteria;
233 EGLint SortOrder;
234 };
235
236 /* This encodes the info from Table 3.5 of the EGL spec, ordered by
237 * Sort Priority.
238 */
239 static struct sort_info SortInfo[] = {
240 { EGL_CONFIG_CAVEAT, EXACT, SPECIAL },
241 { EGL_RED_SIZE, ATLEAST, SPECIAL },
242 { EGL_GREEN_SIZE, ATLEAST, SPECIAL },
243 { EGL_BLUE_SIZE, ATLEAST, SPECIAL },
244 { EGL_ALPHA_SIZE, ATLEAST, SPECIAL },
245 { EGL_BUFFER_SIZE, ATLEAST, SMALLER },
246 { EGL_SAMPLE_BUFFERS, ATLEAST, SMALLER },
247 { EGL_SAMPLES, ATLEAST, SMALLER },
248 { EGL_DEPTH_SIZE, ATLEAST, SMALLER },
249 { EGL_STENCIL_SIZE, ATLEAST, SMALLER },
250 { EGL_NATIVE_VISUAL_TYPE, EXACT, SPECIAL },
251 { EGL_CONFIG_ID, EXACT, SMALLER },
252 { EGL_BIND_TO_TEXTURE_RGB, EXACT, NONE },
253 { EGL_BIND_TO_TEXTURE_RGBA, EXACT, NONE },
254 { EGL_LEVEL, EXACT, NONE },
255 { EGL_NATIVE_RENDERABLE, EXACT, NONE },
256 { EGL_MAX_SWAP_INTERVAL, EXACT, NONE },
257 { EGL_MIN_SWAP_INTERVAL, EXACT, NONE },
258 { EGL_SURFACE_TYPE, MASK, NONE },
259 { EGL_TRANSPARENT_TYPE, EXACT, NONE },
260 { EGL_TRANSPARENT_RED_VALUE, EXACT, NONE },
261 { EGL_TRANSPARENT_GREEN_VALUE, EXACT, NONE },
262 { EGL_TRANSPARENT_BLUE_VALUE, EXACT, NONE },
263 { 0, 0, 0 }
264 };
265
266
267 /**
268 * Return EGL_TRUE if the attributes of c meet or exceed the minimums
269 * specified by min.
270 */
271 EGLBoolean
272 _eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min)
273 {
274 EGLint i;
275 for (i = 0; SortInfo[i].Attribute != 0; i++) {
276 const EGLint mv = GET_CONFIG_ATTRIB(min, SortInfo[i].Attribute);
277 if (mv != EGL_DONT_CARE) {
278 const EGLint cv = GET_CONFIG_ATTRIB(c, SortInfo[i].Attribute);
279 if (SortInfo[i].MatchCriteria == EXACT) {
280 if (cv != mv) {
281 return EGL_FALSE;
282 }
283 }
284 else if (SortInfo[i].MatchCriteria == ATLEAST) {
285 if (cv < mv) {
286 return EGL_FALSE;
287 }
288 }
289 else {
290 assert(SortInfo[i].MatchCriteria == MASK);
291 if ((mv & cv) != mv) {
292 return EGL_FALSE;
293 }
294 }
295 }
296 }
297 return EGL_TRUE;
298 }
299
300
301 /**
302 * Compare configs 'a' and 'b' and return -1 if a belongs before b,
303 * 1 if a belongs after b, or 0 if they're equal.
304 */
305 EGLint
306 _eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b)
307 {
308 EGLint i;
309 for (i = 0; SortInfo[i].Attribute != 0; i++) {
310 const EGLint av = GET_CONFIG_ATTRIB(a, SortInfo[i].Attribute);
311 const EGLint bv = GET_CONFIG_ATTRIB(b, SortInfo[i].Attribute);
312 if (SortInfo[i].SortOrder == SMALLER) {
313 if (av < bv)
314 return -1;
315 else if (av > bv)
316 return 1;
317 /* else, continue examining attribute values */
318 }
319 else if (SortInfo[i].SortOrder == SPECIAL) {
320 if (SortInfo[i].Attribute == EGL_CONFIG_CAVEAT) {
321 /* values are EGL_NONE, SLOW_CONFIG, or NON_CONFORMANT_CONFIG */
322 if (av < bv)
323 return -1;
324 else if (av > bv)
325 return 1;
326 }
327 else if (SortInfo[i].Attribute == EGL_RED_SIZE ||
328 SortInfo[i].Attribute == EGL_GREEN_SIZE ||
329 SortInfo[i].Attribute == EGL_BLUE_SIZE ||
330 SortInfo[i].Attribute == EGL_ALPHA_SIZE) {
331 if (av > bv)
332 return -1;
333 else if (av < bv)
334 return 1;
335 }
336 else {
337 assert(SortInfo[i].Attribute == EGL_NATIVE_VISUAL_TYPE);
338 if (av < bv)
339 return -1;
340 else if (av > bv)
341 return 1;
342 }
343 }
344 else {
345 assert(SortInfo[i].SortOrder == NONE);
346 /* continue examining attribute values */
347 }
348 }
349 return 0;
350 }
351
352
353 /**
354 * Typical fallback routine for eglChooseConfig
355 */
356 EGLBoolean
357 _eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config)
358 {
359 _EGLDisplay *disp = _eglLookupDisplay(dpy);
360 _EGLConfig criteria;
361 EGLint i;
362
363 /* parse the attrib_list to initialize criteria */
364 if (!_eglParseConfigAttribs(&criteria, attrib_list)) {
365 return EGL_FALSE;
366 }
367
368 *num_config = 0;
369 for (i = 0; i < disp->NumConfigs; i++) {
370 const _EGLConfig *conf = disp->Configs + i;
371 if (_eglConfigQualifies(conf, &criteria)) {
372 if (*num_config < config_size) {
373 /* save */
374 configs[*num_config] = conf->Handle;
375 (*num_config)++;
376 }
377 else {
378 break;
379 }
380 }
381 }
382
383 /* XXX sort the list here */
384
385 return EGL_TRUE;
386 }
387
388
389 /**
390 * Fallback for eglGetConfigAttrib.
391 */
392 EGLBoolean
393 _eglGetConfigAttrib(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value)
394 {
395 const _EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
396 const EGLint k = attribute - FIRST_ATTRIB;
397 if (k >= 0 && k < MAX_ATTRIBS) {
398 *value = conf->Attrib[k];
399 return EGL_TRUE;
400 }
401 else {
402 _eglError(EGL_BAD_ATTRIBUTE, "eglGetConfigAttrib");
403 return EGL_FALSE;
404 }
405 }
406
407
408 /**
409 * Fallback for eglGetConfigs.
410 */
411 EGLBoolean
412 _eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config)
413 {
414 _EGLDisplay *disp = _eglLookupDisplay(dpy);
415
416 if (!drv->Initialized) {
417 _eglError(EGL_NOT_INITIALIZED, "eglGetConfigs");
418 return EGL_FALSE;
419 }
420
421 if (configs) {
422 EGLint i;
423 *num_config = MIN2(disp->NumConfigs, config_size);
424 for (i = 0; i < *num_config; i++) {
425 configs[i] = disp->Configs[i].Handle;
426 }
427 } else
428 *num_config = disp->NumConfigs;
429
430 return EGL_TRUE;
431 }
432
433
434 /**
435 * Creates a set of \c __GLcontextModes that a driver will expose.
436 *
437 * A set of \c __GLcontextModes will be created based on the supplied
438 * parameters. The number of modes processed will be 2 *
439 * \c num_depth_stencil_bits * \c num_db_modes.
440 *
441 * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
442 * \c db_modes, and \c visType into each \c __GLcontextModes element.
443 * However, the meanings of \c fb_format and \c fb_type require further
444 * explanation. The \c fb_format specifies which color components are in
445 * each pixel and what the default order is. For example, \c GL_RGB specifies
446 * that red, green, blue are available and red is in the "most significant"
447 * position and blue is in the "least significant". The \c fb_type specifies
448 * the bit sizes of each component and the actual ordering. For example, if
449 * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
450 * are the blue value, bits [10:5] are the green value, and bits [4:0] are
451 * the red value.
452 *
453 * One sublte issue is the combination of \c GL_RGB or \c GL_BGR and either
454 * of the \c GL_UNSIGNED_INT_8_8_8_8 modes. The resulting mask values in the
455 * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
456 * \c GL_BGRA case, except the \c alphaMask is zero. This means that, as
457 * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
458 * still uses 32-bits.
459 *
460 * If in doubt, look at the tables used in the function.
461 *
462 * \param ptr_to_modes Pointer to a pointer to a linked list of
463 * \c __GLcontextModes. Upon completion, a pointer to
464 * the next element to be process will be stored here.
465 * If the function fails and returns \c GL_FALSE, this
466 * value will be unmodified, but some elements in the
467 * linked list may be modified.
468 * \param fb_format Format of the framebuffer. Currently only \c GL_RGB,
469 * \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
470 * \param fb_type Type of the pixels in the framebuffer. Currently only
471 * \c GL_UNSIGNED_SHORT_5_6_5,
472 * \c GL_UNSIGNED_SHORT_5_6_5_REV,
473 * \c GL_UNSIGNED_INT_8_8_8_8, and
474 * \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
475 * \param depth_bits Array of depth buffer sizes to be exposed.
476 * \param stencil_bits Array of stencil buffer sizes to be exposed.
477 * \param num_depth_stencil_bits Number of entries in both \c depth_bits and
478 * \c stencil_bits.
479 * \param db_modes Array of buffer swap modes. If an element has a
480 * value of \c GLX_NONE, then it represents a
481 * single-buffered mode. Other valid values are
482 * \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
483 * \c GLX_SWAP_UNDEFINED_OML. See the
484 * GLX_OML_swap_method extension spec for more details.
485 * \param num_db_modes Number of entries in \c db_modes.
486 * \param visType GLX visual type. Usually either \c GLX_TRUE_COLOR or
487 * \c GLX_DIRECT_COLOR.
488 *
489 * \returns
490 * \c GL_TRUE on success or \c GL_FALSE on failure. Currently the only
491 * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
492 * \c fb_type).
493 *
494 * \todo
495 * There is currently no way to support packed RGB modes (i.e., modes with
496 * exactly 3 bytes per pixel) or floating-point modes. This could probably
497 * be done by creating some new, private enums with clever names likes
498 * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
499 * \c GL_4HALF_16_16_16_16, etc. We can cross that bridge when we come to it.
500 */
501 GLboolean
502 _eglFillInConfigs(_EGLConfig * configs,
503 GLenum fb_format, GLenum fb_type,
504 const u_int8_t * depth_bits, const u_int8_t * stencil_bits,
505 unsigned num_depth_stencil_bits,
506 const GLenum * db_modes, unsigned num_db_modes,
507 int visType) {
508 static const u_int8_t bits_table[3][4] = {
509 /* R G B A */
510 { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */
511 { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
512 { 8, 8, 8, 8 } /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
513 };
514
515 /* The following arrays are all indexed by the fb_type masked with 0x07.
516 * Given the four supported fb_type values, this results in valid array
517 * indices of 3, 4, 5, and 7.
518 */
519 static const u_int32_t masks_table_rgb[8][4] = {
520 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
521 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
522 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
523 {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000}, /* 5_6_5 */
524 {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000}, /* 5_6_5_REV */
525 {0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000}, /* 8_8_8_8 */
526 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
527 {0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000} /* 8_8_8_8_REV */
528 };
529
530 static const u_int32_t masks_table_rgba[8][4] = {
531 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
532 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
533 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
534 {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000}, /* 5_6_5 */
535 {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000}, /* 5_6_5_REV */
536 {0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF}, /* 8_8_8_8 */
537 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
538 {0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000}, /* 8_8_8_8_REV */
539 };
540
541 static const u_int32_t masks_table_bgr[8][4] = {
542 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
543 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
544 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
545 {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000}, /* 5_6_5 */
546 {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000}, /* 5_6_5_REV */
547 {0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000}, /* 8_8_8_8 */
548 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
549 {0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000}, /* 8_8_8_8_REV */
550 };
551
552 static const u_int32_t masks_table_bgra[8][4] = {
553 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
554 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
555 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
556 {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000}, /* 5_6_5 */
557 {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000}, /* 5_6_5_REV */
558 {0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF}, /* 8_8_8_8 */
559 {0x00000000, 0x00000000, 0x00000000, 0x00000000},
560 {0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000}, /* 8_8_8_8_REV */
561 };
562
563 static const u_int8_t bytes_per_pixel[8] = {
564 0, 0, 0, 2, 2, 4, 0, 4
565 };
566
567 const u_int8_t * bits;
568 const u_int32_t * masks;
569 const int index = fb_type & 0x07;
570 _EGLConfig *config;
571 unsigned i;
572 unsigned j;
573 unsigned k;
574
575 if ( bytes_per_pixel[index] == 0 ) {
576 fprintf(stderr, "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.\n",
577 __FUNCTION__, __LINE__, fb_type);
578 return GL_FALSE;
579 }
580
581 /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
582 * the _REV versions.
583 *
584 * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
585 */
586 switch ( fb_format ) {
587 case GL_RGB:
588 bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
589 masks = masks_table_rgb[index];
590 break;
591
592 case GL_RGBA:
593 bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
594 masks = masks_table_rgba[index];
595 break;
596
597 case GL_BGR:
598 bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
599 masks = masks_table_bgr[index];
600 break;
601
602 case GL_BGRA:
603 bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
604 masks = masks_table_bgra[index];
605 break;
606
607 default:
608 fprintf(stderr, "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.\n",
609 __FUNCTION__, __LINE__, fb_format);
610 return GL_FALSE;
611 }
612
613 config = configs;
614 for (k = 0; k < num_depth_stencil_bits; k++) {
615 for (i = 0; i < num_db_modes; i++) {
616 for (j = 0; j < 2; j++) {
617
618 _eglSetConfigAttrib(config, EGL_RED_SIZE, bits[0]);
619 _eglSetConfigAttrib(config, EGL_GREEN_SIZE, bits[1]);
620 _eglSetConfigAttrib(config, EGL_BLUE_SIZE, bits[2]);
621 _eglSetConfigAttrib(config, EGL_ALPHA_SIZE, bits[3]);
622 config->glmode.redMask = masks[0];
623 config->glmode.greenMask = masks[1];
624 config->glmode.blueMask = masks[2];
625 config->glmode.alphaMask = masks[3];
626 _eglSetConfigAttrib(config, EGL_BUFFER_SIZE,
627 config->glmode.redBits + config->glmode.greenBits +
628 config->glmode.blueBits + config->glmode.alphaBits);
629
630 config->glmode.accumRedBits = 16 * j;
631 config->glmode.accumGreenBits = 16 * j;
632 config->glmode.accumBlueBits = 16 * j;
633 config->glmode.accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
634 config->glmode.visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;
635
636 _eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
637 _eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]);
638
639 config->glmode.visualType = visType;
640 config->glmode.renderType = GLX_RGBA_BIT;
641 _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA |
642 EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
643
644 config->glmode.rgbMode = GL_TRUE;
645
646 if (db_modes[i] == GLX_NONE) {
647 config->glmode.doubleBufferMode = GL_FALSE;
648 } else {
649 config->glmode.doubleBufferMode = GL_TRUE;
650 config->glmode.swapMethod = db_modes[i];
651 }
652
653 config->glmode.haveAccumBuffer = ((config->glmode.accumRedBits +
654 config->glmode.accumGreenBits +
655 config->glmode.accumBlueBits +
656 config->glmode.accumAlphaBits) > 0);
657 config->glmode.haveDepthBuffer = (config->glmode.depthBits > 0);
658 config->glmode.haveStencilBuffer = (config->glmode.stencilBits > 0);
659 config++;
660 }
661 }
662 }
663 return GL_TRUE;
664 }