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0a7f983fb2904018a75a4e3ada2fa6c241dd2496
[mesa.git] / src / mesa / main / texstate.c
1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \file texstate.c
27 *
28 * Texture state handling.
29 */
30
31 #include <stdio.h>
32 #include "glheader.h"
33 #include "bufferobj.h"
34 #include "colormac.h"
35 #include "colortab.h"
36 #include "context.h"
37 #include "enums.h"
38 #include "macros.h"
39 #include "shaderimage.h"
40 #include "texobj.h"
41 #include "teximage.h"
42 #include "texstate.h"
43 #include "mtypes.h"
44 #include "util/bitset.h"
45
46
47 /**
48 * Default texture combine environment state. This is used to initialize
49 * a context's texture units and as the basis for converting "classic"
50 * texture environmnets to ARB_texture_env_combine style values.
51 */
52 static const struct gl_tex_env_combine_state default_combine_state = {
53 GL_MODULATE, GL_MODULATE,
54 { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
55 { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
56 { GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_ALPHA, GL_SRC_ALPHA },
57 { GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA },
58 0, 0,
59 2, 2
60 };
61
62
63
64 /**
65 * Used by glXCopyContext to copy texture state from one context to another.
66 */
67 void
68 _mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst )
69 {
70 GLuint u, tex;
71
72 assert(src);
73 assert(dst);
74
75 dst->Texture.CurrentUnit = src->Texture.CurrentUnit;
76 dst->Texture._GenFlags = src->Texture._GenFlags;
77 dst->Texture._TexGenEnabled = src->Texture._TexGenEnabled;
78 dst->Texture._TexMatEnabled = src->Texture._TexMatEnabled;
79
80 /* per-unit state */
81 for (u = 0; u < src->Const.MaxCombinedTextureImageUnits; u++) {
82 dst->Texture.Unit[u].Enabled = src->Texture.Unit[u].Enabled;
83 dst->Texture.Unit[u].EnvMode = src->Texture.Unit[u].EnvMode;
84 COPY_4V(dst->Texture.Unit[u].EnvColor, src->Texture.Unit[u].EnvColor);
85 dst->Texture.Unit[u].TexGenEnabled = src->Texture.Unit[u].TexGenEnabled;
86 dst->Texture.Unit[u].GenS = src->Texture.Unit[u].GenS;
87 dst->Texture.Unit[u].GenT = src->Texture.Unit[u].GenT;
88 dst->Texture.Unit[u].GenR = src->Texture.Unit[u].GenR;
89 dst->Texture.Unit[u].GenQ = src->Texture.Unit[u].GenQ;
90 dst->Texture.Unit[u].LodBias = src->Texture.Unit[u].LodBias;
91
92 /* GL_EXT_texture_env_combine */
93 dst->Texture.Unit[u].Combine = src->Texture.Unit[u].Combine;
94
95 /*
96 * XXX strictly speaking, we should compare texture names/ids and
97 * bind textures in the dest context according to id. For now, only
98 * copy bindings if the contexts share the same pool of textures to
99 * avoid refcounting bugs.
100 */
101 if (dst->Shared == src->Shared) {
102 /* copy texture object bindings, not contents of texture objects */
103 _mesa_lock_context_textures(dst);
104
105 for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
106 _mesa_reference_texobj(&dst->Texture.Unit[u].CurrentTex[tex],
107 src->Texture.Unit[u].CurrentTex[tex]);
108 if (src->Texture.Unit[u].CurrentTex[tex]) {
109 dst->Texture.NumCurrentTexUsed =
110 MAX2(dst->Texture.NumCurrentTexUsed, u + 1);
111 }
112 }
113 dst->Texture.Unit[u]._BoundTextures = src->Texture.Unit[u]._BoundTextures;
114 _mesa_unlock_context_textures(dst);
115 }
116 }
117 }
118
119
120 /*
121 * For debugging
122 */
123 void
124 _mesa_print_texunit_state( struct gl_context *ctx, GLuint unit )
125 {
126 const struct gl_texture_unit *texUnit = ctx->Texture.Unit + unit;
127 printf("Texture Unit %d\n", unit);
128 printf(" GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit->EnvMode));
129 printf(" GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeRGB));
130 printf(" GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeA));
131 printf(" GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[0]));
132 printf(" GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[1]));
133 printf(" GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[2]));
134 printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[0]));
135 printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[1]));
136 printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[2]));
137 printf(" GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[0]));
138 printf(" GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[1]));
139 printf(" GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[2]));
140 printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[0]));
141 printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[1]));
142 printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[2]));
143 printf(" GL_RGB_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftRGB);
144 printf(" GL_ALPHA_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftA);
145 printf(" GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit->EnvColor[0], texUnit->EnvColor[1], texUnit->EnvColor[2], texUnit->EnvColor[3]);
146 }
147
148
149
150 /**********************************************************************/
151 /* Texture Environment */
152 /**********************************************************************/
153
154 /**
155 * Convert "classic" texture environment to ARB_texture_env_combine style
156 * environments.
157 *
158 * \param state texture_env_combine state vector to be filled-in.
159 * \param mode Classic texture environment mode (i.e., \c GL_REPLACE,
160 * \c GL_BLEND, \c GL_DECAL, etc.).
161 * \param texBaseFormat Base format of the texture associated with the
162 * texture unit.
163 */
164 static void
165 calculate_derived_texenv( struct gl_tex_env_combine_state *state,
166 GLenum mode, GLenum texBaseFormat )
167 {
168 GLenum mode_rgb;
169 GLenum mode_a;
170
171 *state = default_combine_state;
172
173 switch (texBaseFormat) {
174 case GL_ALPHA:
175 state->SourceRGB[0] = GL_PREVIOUS;
176 break;
177
178 case GL_LUMINANCE_ALPHA:
179 case GL_INTENSITY:
180 case GL_RGBA:
181 break;
182
183 case GL_LUMINANCE:
184 case GL_RED:
185 case GL_RG:
186 case GL_RGB:
187 case GL_YCBCR_MESA:
188 state->SourceA[0] = GL_PREVIOUS;
189 break;
190
191 default:
192 _mesa_problem(NULL,
193 "Invalid texBaseFormat 0x%x in calculate_derived_texenv",
194 texBaseFormat);
195 return;
196 }
197
198 if (mode == GL_REPLACE_EXT)
199 mode = GL_REPLACE;
200
201 switch (mode) {
202 case GL_REPLACE:
203 case GL_MODULATE:
204 mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : mode;
205 mode_a = mode;
206 break;
207
208 case GL_DECAL:
209 mode_rgb = GL_INTERPOLATE;
210 mode_a = GL_REPLACE;
211
212 state->SourceA[0] = GL_PREVIOUS;
213
214 /* Having alpha / luminance / intensity textures replace using the
215 * incoming fragment color matches the definition in NV_texture_shader.
216 * The 1.5 spec simply marks these as "undefined".
217 */
218 switch (texBaseFormat) {
219 case GL_ALPHA:
220 case GL_LUMINANCE:
221 case GL_LUMINANCE_ALPHA:
222 case GL_INTENSITY:
223 state->SourceRGB[0] = GL_PREVIOUS;
224 break;
225 case GL_RED:
226 case GL_RG:
227 case GL_RGB:
228 case GL_YCBCR_MESA:
229 mode_rgb = GL_REPLACE;
230 break;
231 case GL_RGBA:
232 state->SourceRGB[2] = GL_TEXTURE;
233 break;
234 }
235 break;
236
237 case GL_BLEND:
238 mode_rgb = GL_INTERPOLATE;
239 mode_a = GL_MODULATE;
240
241 switch (texBaseFormat) {
242 case GL_ALPHA:
243 mode_rgb = GL_REPLACE;
244 break;
245 case GL_INTENSITY:
246 mode_a = GL_INTERPOLATE;
247 state->SourceA[0] = GL_CONSTANT;
248 state->OperandA[2] = GL_SRC_ALPHA;
249 /* FALLTHROUGH */
250 case GL_LUMINANCE:
251 case GL_RED:
252 case GL_RG:
253 case GL_RGB:
254 case GL_LUMINANCE_ALPHA:
255 case GL_RGBA:
256 case GL_YCBCR_MESA:
257 state->SourceRGB[2] = GL_TEXTURE;
258 state->SourceA[2] = GL_TEXTURE;
259 state->SourceRGB[0] = GL_CONSTANT;
260 state->OperandRGB[2] = GL_SRC_COLOR;
261 break;
262 }
263 break;
264
265 case GL_ADD:
266 mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : GL_ADD;
267 mode_a = (texBaseFormat == GL_INTENSITY) ? GL_ADD : GL_MODULATE;
268 break;
269
270 default:
271 _mesa_problem(NULL,
272 "Invalid texture env mode 0x%x in calculate_derived_texenv",
273 mode);
274 return;
275 }
276
277 state->ModeRGB = (state->SourceRGB[0] != GL_PREVIOUS)
278 ? mode_rgb : GL_REPLACE;
279 state->ModeA = (state->SourceA[0] != GL_PREVIOUS)
280 ? mode_a : GL_REPLACE;
281 }
282
283
284
285
286 /* GL_ARB_multitexture */
287 void GLAPIENTRY
288 _mesa_ActiveTexture(GLenum texture)
289 {
290 const GLuint texUnit = texture - GL_TEXTURE0;
291 GLuint k;
292 GET_CURRENT_CONTEXT(ctx);
293
294 k = _mesa_max_tex_unit(ctx);
295
296 assert(k <= ARRAY_SIZE(ctx->Texture.Unit));
297
298 if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
299 _mesa_debug(ctx, "glActiveTexture %s\n",
300 _mesa_lookup_enum_by_nr(texture));
301
302 if (texUnit >= k) {
303 _mesa_error(ctx, GL_INVALID_ENUM, "glActiveTexture(texture=%s)",
304 _mesa_lookup_enum_by_nr(texture));
305 return;
306 }
307
308 if (ctx->Texture.CurrentUnit == texUnit)
309 return;
310
311 FLUSH_VERTICES(ctx, _NEW_TEXTURE);
312
313 ctx->Texture.CurrentUnit = texUnit;
314 if (ctx->Transform.MatrixMode == GL_TEXTURE) {
315 /* update current stack pointer */
316 ctx->CurrentStack = &ctx->TextureMatrixStack[texUnit];
317 }
318 }
319
320
321 /* GL_ARB_multitexture */
322 void GLAPIENTRY
323 _mesa_ClientActiveTexture(GLenum texture)
324 {
325 GET_CURRENT_CONTEXT(ctx);
326 GLuint texUnit = texture - GL_TEXTURE0;
327
328 if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
329 _mesa_debug(ctx, "glClientActiveTexture %s\n",
330 _mesa_lookup_enum_by_nr(texture));
331
332 if (texUnit >= ctx->Const.MaxTextureCoordUnits) {
333 _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)");
334 return;
335 }
336
337 if (ctx->Array.ActiveTexture == texUnit)
338 return;
339
340 FLUSH_VERTICES(ctx, _NEW_ARRAY);
341 ctx->Array.ActiveTexture = texUnit;
342 }
343
344
345
346 /**********************************************************************/
347 /***** State management *****/
348 /**********************************************************************/
349
350
351 /**
352 * \note This routine refers to derived texture attribute values to
353 * compute the ENABLE_TEXMAT flags, but is only called on
354 * _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
355 * flags are updated by _mesa_update_textures(), below.
356 *
357 * \param ctx GL context.
358 */
359 static void
360 update_texture_matrices( struct gl_context *ctx )
361 {
362 GLuint u;
363
364 ctx->Texture._TexMatEnabled = 0x0;
365
366 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
367 assert(u < ARRAY_SIZE(ctx->TextureMatrixStack));
368 if (_math_matrix_is_dirty(ctx->TextureMatrixStack[u].Top)) {
369 _math_matrix_analyse( ctx->TextureMatrixStack[u].Top );
370
371 if (ctx->Texture.Unit[u]._Current &&
372 ctx->TextureMatrixStack[u].Top->type != MATRIX_IDENTITY)
373 ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(u);
374 }
375 }
376 }
377
378
379 /**
380 * Examine texture unit's combine/env state to update derived state.
381 */
382 static void
383 update_tex_combine(struct gl_context *ctx, struct gl_texture_unit *texUnit)
384 {
385 struct gl_tex_env_combine_state *combine;
386
387 /* No combiners will apply to this. */
388 if (texUnit->_Current->Target == GL_TEXTURE_BUFFER)
389 return;
390
391 /* Set the texUnit->_CurrentCombine field to point to the user's combiner
392 * state, or the combiner state which is derived from traditional texenv
393 * mode.
394 */
395 if (texUnit->EnvMode == GL_COMBINE ||
396 texUnit->EnvMode == GL_COMBINE4_NV) {
397 texUnit->_CurrentCombine = & texUnit->Combine;
398 }
399 else {
400 const struct gl_texture_object *texObj = texUnit->_Current;
401 GLenum format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat;
402
403 if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
404 format = texObj->DepthMode;
405 }
406 calculate_derived_texenv(&texUnit->_EnvMode, texUnit->EnvMode, format);
407 texUnit->_CurrentCombine = & texUnit->_EnvMode;
408 }
409
410 combine = texUnit->_CurrentCombine;
411
412 /* Determine number of source RGB terms in the combiner function */
413 switch (combine->ModeRGB) {
414 case GL_REPLACE:
415 combine->_NumArgsRGB = 1;
416 break;
417 case GL_ADD:
418 case GL_ADD_SIGNED:
419 if (texUnit->EnvMode == GL_COMBINE4_NV)
420 combine->_NumArgsRGB = 4;
421 else
422 combine->_NumArgsRGB = 2;
423 break;
424 case GL_MODULATE:
425 case GL_SUBTRACT:
426 case GL_DOT3_RGB:
427 case GL_DOT3_RGBA:
428 case GL_DOT3_RGB_EXT:
429 case GL_DOT3_RGBA_EXT:
430 combine->_NumArgsRGB = 2;
431 break;
432 case GL_INTERPOLATE:
433 case GL_MODULATE_ADD_ATI:
434 case GL_MODULATE_SIGNED_ADD_ATI:
435 case GL_MODULATE_SUBTRACT_ATI:
436 combine->_NumArgsRGB = 3;
437 break;
438 default:
439 combine->_NumArgsRGB = 0;
440 _mesa_problem(ctx, "invalid RGB combine mode in update_texture_state");
441 return;
442 }
443
444 /* Determine number of source Alpha terms in the combiner function */
445 switch (combine->ModeA) {
446 case GL_REPLACE:
447 combine->_NumArgsA = 1;
448 break;
449 case GL_ADD:
450 case GL_ADD_SIGNED:
451 if (texUnit->EnvMode == GL_COMBINE4_NV)
452 combine->_NumArgsA = 4;
453 else
454 combine->_NumArgsA = 2;
455 break;
456 case GL_MODULATE:
457 case GL_SUBTRACT:
458 combine->_NumArgsA = 2;
459 break;
460 case GL_INTERPOLATE:
461 case GL_MODULATE_ADD_ATI:
462 case GL_MODULATE_SIGNED_ADD_ATI:
463 case GL_MODULATE_SUBTRACT_ATI:
464 combine->_NumArgsA = 3;
465 break;
466 default:
467 combine->_NumArgsA = 0;
468 _mesa_problem(ctx, "invalid Alpha combine mode in update_texture_state");
469 break;
470 }
471 }
472
473 static void
474 update_texgen(struct gl_context *ctx)
475 {
476 GLuint unit;
477
478 /* Setup texgen for those texture coordinate sets that are in use */
479 for (unit = 0; unit < ctx->Const.MaxTextureCoordUnits; unit++) {
480 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
481
482 texUnit->_GenFlags = 0x0;
483
484 if (!(ctx->Texture._EnabledCoordUnits & (1 << unit)))
485 continue;
486
487 if (texUnit->TexGenEnabled) {
488 if (texUnit->TexGenEnabled & S_BIT) {
489 texUnit->_GenFlags |= texUnit->GenS._ModeBit;
490 }
491 if (texUnit->TexGenEnabled & T_BIT) {
492 texUnit->_GenFlags |= texUnit->GenT._ModeBit;
493 }
494 if (texUnit->TexGenEnabled & R_BIT) {
495 texUnit->_GenFlags |= texUnit->GenR._ModeBit;
496 }
497 if (texUnit->TexGenEnabled & Q_BIT) {
498 texUnit->_GenFlags |= texUnit->GenQ._ModeBit;
499 }
500
501 ctx->Texture._TexGenEnabled |= ENABLE_TEXGEN(unit);
502 ctx->Texture._GenFlags |= texUnit->_GenFlags;
503 }
504
505 assert(unit < ARRAY_SIZE(ctx->TextureMatrixStack));
506 if (ctx->TextureMatrixStack[unit].Top->type != MATRIX_IDENTITY)
507 ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(unit);
508 }
509 }
510
511 static struct gl_texture_object *
512 update_single_program_texture(struct gl_context *ctx, struct gl_program *prog,
513 int s)
514 {
515 gl_texture_index target_index;
516 struct gl_texture_unit *texUnit;
517 struct gl_texture_object *texObj;
518 struct gl_sampler_object *sampler;
519 int unit;
520
521 if (!(prog->SamplersUsed & (1 << s)))
522 return NULL;
523
524 unit = prog->SamplerUnits[s];
525 texUnit = &ctx->Texture.Unit[unit];
526
527 /* Note: If more than one bit was set in TexturesUsed[unit], then we should
528 * have had the draw call rejected already. From the GL 4.4 specification,
529 * section 7.10 ("Samplers"):
530 *
531 * "It is not allowed to have variables of different sampler types
532 * pointing to the same texture image unit within a program
533 * object. This situation can only be detected at the next rendering
534 * command issued which triggers shader invocations, and an
535 * INVALID_OPERATION error will then be generated."
536 */
537 target_index = ffs(prog->TexturesUsed[unit]) - 1;
538 texObj = texUnit->CurrentTex[target_index];
539
540 sampler = texUnit->Sampler ?
541 texUnit->Sampler : &texObj->Sampler;
542
543 if (likely(texObj)) {
544 if (_mesa_is_texture_complete(texObj, sampler))
545 return texObj;
546
547 _mesa_test_texobj_completeness(ctx, texObj);
548 if (_mesa_is_texture_complete(texObj, sampler))
549 return texObj;
550 }
551
552 /* If we've reached this point, we didn't find a complete texture of the
553 * shader's target. From the GL 4.4 core specification, section 11.1.3.5
554 * ("Texture Access"):
555 *
556 * "If a sampler is used in a shader and the sampler’s associated
557 * texture is not complete, as defined in section 8.17, (0, 0, 0, 1)
558 * will be returned for a non-shadow sampler and 0 for a shadow
559 * sampler."
560 *
561 * Mesa implements this by creating a hidden texture object with a pixel of
562 * that value.
563 */
564 texObj = _mesa_get_fallback_texture(ctx, target_index);
565 assert(texObj);
566
567 return texObj;
568 }
569
570 static void
571 update_program_texture_state(struct gl_context *ctx, struct gl_program **prog,
572 BITSET_WORD *enabled_texture_units)
573 {
574 int i;
575
576 for (i = 0; i < MESA_SHADER_STAGES; i++) {
577 int s;
578
579 if (!prog[i])
580 continue;
581
582 /* We can't only do the shifting trick as the loop condition because if
583 * sampler 31 is active, the next iteration tries to shift by 32, which is
584 * undefined.
585 */
586 for (s = 0; s < MAX_SAMPLERS && (1 << s) <= prog[i]->SamplersUsed; s++) {
587 struct gl_texture_object *texObj;
588
589 texObj = update_single_program_texture(ctx, prog[i], s);
590 if (texObj) {
591 int unit = prog[i]->SamplerUnits[s];
592 _mesa_reference_texobj(&ctx->Texture.Unit[unit]._Current, texObj);
593 BITSET_SET(enabled_texture_units, unit);
594 ctx->Texture._MaxEnabledTexImageUnit =
595 MAX2(ctx->Texture._MaxEnabledTexImageUnit, (int)unit);
596 }
597 }
598 }
599
600 if (prog[MESA_SHADER_FRAGMENT]) {
601 const GLuint coordMask = (1 << MAX_TEXTURE_COORD_UNITS) - 1;
602 ctx->Texture._EnabledCoordUnits |=
603 (prog[MESA_SHADER_FRAGMENT]->InputsRead >> VARYING_SLOT_TEX0) &
604 coordMask;
605 }
606 }
607
608 static void
609 update_ff_texture_state(struct gl_context *ctx,
610 BITSET_WORD *enabled_texture_units)
611 {
612 int unit;
613
614 for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
615 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
616 GLuint texIndex;
617
618 if (texUnit->Enabled == 0x0)
619 continue;
620
621 /* If a shader already dictated what texture target was used for this
622 * unit, just go along with it.
623 */
624 if (BITSET_TEST(enabled_texture_units, unit))
625 continue;
626
627 /* From the GL 4.4 compat specification, section 16.2 ("Texture Application"):
628 *
629 * "Texturing is enabled or disabled using the generic Enable and
630 * Disable commands, respectively, with the symbolic constants
631 * TEXTURE_1D, TEXTURE_2D, TEXTURE_RECTANGLE, TEXTURE_3D, or
632 * TEXTURE_CUBE_MAP to enable the one-, two-, rectangular,
633 * three-dimensional, or cube map texture, respectively. If more
634 * than one of these textures is enabled, the first one enabled
635 * from the following list is used:
636 *
637 * • cube map texture
638 * • three-dimensional texture
639 * • rectangular texture
640 * • two-dimensional texture
641 * • one-dimensional texture"
642 *
643 * Note that the TEXTURE_x_INDEX values are in high to low priority.
644 * Also:
645 *
646 * "If a texture unit is disabled or has an invalid or incomplete
647 * texture (as defined in section 8.17) bound to it, then blending
648 * is disabled for that texture unit. If the texture environment
649 * for a given enabled texture unit references a disabled texture
650 * unit, or an invalid or incomplete texture that is bound to
651 * another unit, then the results of texture blending are
652 * undefined."
653 */
654 for (texIndex = 0; texIndex < NUM_TEXTURE_TARGETS; texIndex++) {
655 if (texUnit->Enabled & (1 << texIndex)) {
656 struct gl_texture_object *texObj = texUnit->CurrentTex[texIndex];
657 struct gl_sampler_object *sampler = texUnit->Sampler ?
658 texUnit->Sampler : &texObj->Sampler;
659
660 if (!_mesa_is_texture_complete(texObj, sampler)) {
661 _mesa_test_texobj_completeness(ctx, texObj);
662 }
663 if (_mesa_is_texture_complete(texObj, sampler)) {
664 _mesa_reference_texobj(&texUnit->_Current, texObj);
665 break;
666 }
667 }
668 }
669
670 if (texIndex == NUM_TEXTURE_TARGETS)
671 continue;
672
673 /* if we get here, we know this texture unit is enabled */
674 BITSET_SET(enabled_texture_units, unit);
675 ctx->Texture._MaxEnabledTexImageUnit =
676 MAX2(ctx->Texture._MaxEnabledTexImageUnit, (int)unit);
677
678 ctx->Texture._EnabledCoordUnits |= 1 << unit;
679
680 update_tex_combine(ctx, texUnit);
681 }
682 }
683
684 /**
685 * \note This routine refers to derived texture matrix values to
686 * compute the ENABLE_TEXMAT flags, but is only called on
687 * _NEW_TEXTURE. On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
688 * flags are updated by _mesa_update_texture_matrices, above.
689 *
690 * \param ctx GL context.
691 */
692 static void
693 update_texture_state( struct gl_context *ctx )
694 {
695 struct gl_program *prog[MESA_SHADER_STAGES];
696 int i;
697 int old_max_unit = ctx->Texture._MaxEnabledTexImageUnit;
698 BITSET_DECLARE(enabled_texture_units, MAX_COMBINED_TEXTURE_IMAGE_UNITS);
699
700 for (i = 0; i < MESA_SHADER_STAGES; i++) {
701 if (ctx->_Shader->CurrentProgram[i] &&
702 ctx->_Shader->CurrentProgram[i]->LinkStatus) {
703 prog[i] = ctx->_Shader->CurrentProgram[i]->_LinkedShaders[i]->Program;
704 } else {
705 if (i == MESA_SHADER_FRAGMENT && ctx->FragmentProgram._Enabled)
706 prog[i] = &ctx->FragmentProgram.Current->Base;
707 else
708 prog[i] = NULL;
709 }
710 }
711
712 /* TODO: only set this if there are actual changes */
713 ctx->NewState |= _NEW_TEXTURE;
714
715 ctx->Texture._GenFlags = 0x0;
716 ctx->Texture._TexMatEnabled = 0x0;
717 ctx->Texture._TexGenEnabled = 0x0;
718 ctx->Texture._MaxEnabledTexImageUnit = -1;
719 ctx->Texture._EnabledCoordUnits = 0x0;
720
721 memset(&enabled_texture_units, 0, sizeof(enabled_texture_units));
722
723 /* First, walk over our programs pulling in all the textures for them.
724 * Programs dictate specific texture targets to be enabled, and for a draw
725 * call to be valid they can't conflict about which texture targets are
726 * used.
727 */
728 update_program_texture_state(ctx, prog, enabled_texture_units);
729
730 /* Also pull in any textures necessary for fixed function fragment shading.
731 */
732 if (!prog[MESA_SHADER_FRAGMENT])
733 update_ff_texture_state(ctx, enabled_texture_units);
734
735 /* Now, clear out the _Current of any disabled texture units. */
736 for (i = 0; i <= ctx->Texture._MaxEnabledTexImageUnit; i++) {
737 if (!BITSET_TEST(enabled_texture_units, i))
738 _mesa_reference_texobj(&ctx->Texture.Unit[i]._Current, NULL);
739 }
740 for (i = ctx->Texture._MaxEnabledTexImageUnit + 1; i <= old_max_unit; i++) {
741 _mesa_reference_texobj(&ctx->Texture.Unit[i]._Current, NULL);
742 }
743
744 if (!prog[MESA_SHADER_FRAGMENT] || !prog[MESA_SHADER_VERTEX])
745 update_texgen(ctx);
746
747 _mesa_validate_image_units(ctx);
748 }
749
750
751 /**
752 * Update texture-related derived state.
753 */
754 void
755 _mesa_update_texture( struct gl_context *ctx, GLuint new_state )
756 {
757 if (new_state & _NEW_TEXTURE_MATRIX)
758 update_texture_matrices( ctx );
759
760 if (new_state & (_NEW_TEXTURE | _NEW_PROGRAM))
761 update_texture_state( ctx );
762 }
763
764
765 /**********************************************************************/
766 /***** Initialization *****/
767 /**********************************************************************/
768
769 /**
770 * Allocate the proxy textures for the given context.
771 *
772 * \param ctx the context to allocate proxies for.
773 *
774 * \return GL_TRUE on success, or GL_FALSE on failure
775 *
776 * If run out of memory part way through the allocations, clean up and return
777 * GL_FALSE.
778 */
779 static GLboolean
780 alloc_proxy_textures( struct gl_context *ctx )
781 {
782 /* NOTE: these values must be in the same order as the TEXTURE_x_INDEX
783 * values!
784 */
785 static const GLenum targets[] = {
786 GL_TEXTURE_2D_MULTISAMPLE,
787 GL_TEXTURE_2D_MULTISAMPLE_ARRAY,
788 GL_TEXTURE_CUBE_MAP_ARRAY,
789 GL_TEXTURE_BUFFER,
790 GL_TEXTURE_2D_ARRAY_EXT,
791 GL_TEXTURE_1D_ARRAY_EXT,
792 GL_TEXTURE_EXTERNAL_OES,
793 GL_TEXTURE_CUBE_MAP_ARB,
794 GL_TEXTURE_3D,
795 GL_TEXTURE_RECTANGLE_NV,
796 GL_TEXTURE_2D,
797 GL_TEXTURE_1D,
798 };
799 GLint tgt;
800
801 STATIC_ASSERT(ARRAY_SIZE(targets) == NUM_TEXTURE_TARGETS);
802 assert(targets[TEXTURE_2D_INDEX] == GL_TEXTURE_2D);
803 assert(targets[TEXTURE_CUBE_INDEX] == GL_TEXTURE_CUBE_MAP);
804
805 for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
806 if (!(ctx->Texture.ProxyTex[tgt]
807 = ctx->Driver.NewTextureObject(ctx, 0, targets[tgt]))) {
808 /* out of memory, free what we did allocate */
809 while (--tgt >= 0) {
810 ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
811 }
812 return GL_FALSE;
813 }
814 }
815
816 assert(ctx->Texture.ProxyTex[0]->RefCount == 1); /* sanity check */
817 return GL_TRUE;
818 }
819
820
821 /**
822 * Initialize a texture unit.
823 *
824 * \param ctx GL context.
825 * \param unit texture unit number to be initialized.
826 */
827 static void
828 init_texture_unit( struct gl_context *ctx, GLuint unit )
829 {
830 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
831 GLuint tex;
832
833 texUnit->EnvMode = GL_MODULATE;
834 ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 );
835
836 texUnit->Combine = default_combine_state;
837 texUnit->_EnvMode = default_combine_state;
838 texUnit->_CurrentCombine = & texUnit->_EnvMode;
839
840 texUnit->TexGenEnabled = 0x0;
841 texUnit->GenS.Mode = GL_EYE_LINEAR;
842 texUnit->GenT.Mode = GL_EYE_LINEAR;
843 texUnit->GenR.Mode = GL_EYE_LINEAR;
844 texUnit->GenQ.Mode = GL_EYE_LINEAR;
845 texUnit->GenS._ModeBit = TEXGEN_EYE_LINEAR;
846 texUnit->GenT._ModeBit = TEXGEN_EYE_LINEAR;
847 texUnit->GenR._ModeBit = TEXGEN_EYE_LINEAR;
848 texUnit->GenQ._ModeBit = TEXGEN_EYE_LINEAR;
849
850 /* Yes, these plane coefficients are correct! */
851 ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 );
852 ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 );
853 ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
854 ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
855 ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 );
856 ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 );
857 ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 );
858 ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 );
859
860 /* initialize current texture object ptrs to the shared default objects */
861 for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
862 _mesa_reference_texobj(&texUnit->CurrentTex[tex],
863 ctx->Shared->DefaultTex[tex]);
864 }
865
866 texUnit->_BoundTextures = 0;
867 }
868
869
870 /**
871 * Initialize texture state for the given context.
872 */
873 GLboolean
874 _mesa_init_texture(struct gl_context *ctx)
875 {
876 GLuint u;
877
878 /* Texture group */
879 ctx->Texture.CurrentUnit = 0; /* multitexture */
880
881 /* Appendix F.2 of the OpenGL ES 3.0 spec says:
882 *
883 * "OpenGL ES 3.0 requires that all cube map filtering be
884 * seamless. OpenGL ES 2.0 specified that a single cube map face be
885 * selected and used for filtering."
886 *
887 * Unfortunatley, a call to _mesa_is_gles3 below will only work if
888 * the driver has already computed and set ctx->Version, however drivers
889 * seem to call _mesa_initialize_context (which calls this) early
890 * in the CreateContext hook and _mesa_compute_version much later (since
891 * it needs information about available extensions). So, we will
892 * enable seamless cubemaps by default since GLES2. This should work
893 * for most implementations and drivers that don't support seamless
894 * cubemaps for GLES2 can still disable it.
895 */
896 ctx->Texture.CubeMapSeamless = ctx->API == API_OPENGLES2;
897
898 for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++)
899 init_texture_unit(ctx, u);
900
901 /* After we're done initializing the context's texture state the default
902 * texture objects' refcounts should be at least
903 * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
904 */
905 assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount
906 >= MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1);
907
908 /* Allocate proxy textures */
909 if (!alloc_proxy_textures( ctx ))
910 return GL_FALSE;
911
912 /* GL_ARB_texture_buffer_object */
913 _mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject,
914 ctx->Shared->NullBufferObj);
915
916 ctx->Texture.NumCurrentTexUsed = 0;
917
918 return GL_TRUE;
919 }
920
921
922 /**
923 * Free dynamically-allocted texture data attached to the given context.
924 */
925 void
926 _mesa_free_texture_data(struct gl_context *ctx)
927 {
928 GLuint u, tgt;
929
930 /* unreference current textures */
931 for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) {
932 /* The _Current texture could account for another reference */
933 _mesa_reference_texobj(&ctx->Texture.Unit[u]._Current, NULL);
934
935 for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
936 _mesa_reference_texobj(&ctx->Texture.Unit[u].CurrentTex[tgt], NULL);
937 }
938 }
939
940 /* Free proxy texture objects */
941 for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++)
942 ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
943
944 /* GL_ARB_texture_buffer_object */
945 _mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject, NULL);
946
947 for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) {
948 _mesa_reference_sampler_object(ctx, &ctx->Texture.Unit[u].Sampler, NULL);
949 }
950 }
951
952
953 /**
954 * Update the default texture objects in the given context to reference those
955 * specified in the shared state and release those referencing the old
956 * shared state.
957 */
958 void
959 _mesa_update_default_objects_texture(struct gl_context *ctx)
960 {
961 GLuint u, tex;
962
963 for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) {
964 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
965 for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
966 _mesa_reference_texobj(&texUnit->CurrentTex[tex],
967 ctx->Shared->DefaultTex[tex]);
968 }
969 }
970 }