2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 * Texture state handling.
32 #include "bufferobj.h"
46 * Default texture combine environment state. This is used to initialize
47 * a context's texture units and as the basis for converting "classic"
48 * texture environmnets to ARB_texture_env_combine style values.
50 static const struct gl_tex_env_combine_state default_combine_state = {
51 GL_MODULATE, GL_MODULATE,
52 { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
53 { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
54 { GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_ALPHA, GL_SRC_ALPHA },
55 { GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA },
63 * Used by glXCopyContext to copy texture state from one context to another.
66 _mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst )
73 dst->Texture.CurrentUnit = src->Texture.CurrentUnit;
74 dst->Texture._GenFlags = src->Texture._GenFlags;
75 dst->Texture._TexGenEnabled = src->Texture._TexGenEnabled;
76 dst->Texture._TexMatEnabled = src->Texture._TexMatEnabled;
79 for (u = 0; u < src->Const.MaxCombinedTextureImageUnits; u++) {
80 dst->Texture.Unit[u].Enabled = src->Texture.Unit[u].Enabled;
81 dst->Texture.Unit[u].EnvMode = src->Texture.Unit[u].EnvMode;
82 COPY_4V(dst->Texture.Unit[u].EnvColor, src->Texture.Unit[u].EnvColor);
83 dst->Texture.Unit[u].TexGenEnabled = src->Texture.Unit[u].TexGenEnabled;
84 dst->Texture.Unit[u].GenS = src->Texture.Unit[u].GenS;
85 dst->Texture.Unit[u].GenT = src->Texture.Unit[u].GenT;
86 dst->Texture.Unit[u].GenR = src->Texture.Unit[u].GenR;
87 dst->Texture.Unit[u].GenQ = src->Texture.Unit[u].GenQ;
88 dst->Texture.Unit[u].LodBias = src->Texture.Unit[u].LodBias;
90 /* GL_EXT_texture_env_combine */
91 dst->Texture.Unit[u].Combine = src->Texture.Unit[u].Combine;
93 /* GL_ATI_envmap_bumpmap - need this? */
94 dst->Texture.Unit[u].BumpTarget = src->Texture.Unit[u].BumpTarget;
95 COPY_4V(dst->Texture.Unit[u].RotMatrix, src->Texture.Unit[u].RotMatrix);
98 * XXX strictly speaking, we should compare texture names/ids and
99 * bind textures in the dest context according to id. For now, only
100 * copy bindings if the contexts share the same pool of textures to
101 * avoid refcounting bugs.
103 if (dst->Shared == src->Shared) {
104 /* copy texture object bindings, not contents of texture objects */
105 _mesa_lock_context_textures(dst);
107 for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
108 _mesa_reference_texobj(&dst->Texture.Unit[u].CurrentTex[tex],
109 src->Texture.Unit[u].CurrentTex[tex]);
111 _mesa_unlock_context_textures(dst);
121 _mesa_print_texunit_state( struct gl_context *ctx, GLuint unit )
123 const struct gl_texture_unit *texUnit = ctx->Texture.Unit + unit;
124 printf("Texture Unit %d\n", unit);
125 printf(" GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit->EnvMode));
126 printf(" GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeRGB));
127 printf(" GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeA));
128 printf(" GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[0]));
129 printf(" GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[1]));
130 printf(" GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[2]));
131 printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[0]));
132 printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[1]));
133 printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[2]));
134 printf(" GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[0]));
135 printf(" GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[1]));
136 printf(" GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[2]));
137 printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[0]));
138 printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[1]));
139 printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[2]));
140 printf(" GL_RGB_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftRGB);
141 printf(" GL_ALPHA_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftA);
142 printf(" GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit->EnvColor[0], texUnit->EnvColor[1], texUnit->EnvColor[2], texUnit->EnvColor[3]);
147 /**********************************************************************/
148 /* Texture Environment */
149 /**********************************************************************/
152 * Convert "classic" texture environment to ARB_texture_env_combine style
155 * \param state texture_env_combine state vector to be filled-in.
156 * \param mode Classic texture environment mode (i.e., \c GL_REPLACE,
157 * \c GL_BLEND, \c GL_DECAL, etc.).
158 * \param texBaseFormat Base format of the texture associated with the
162 calculate_derived_texenv( struct gl_tex_env_combine_state *state,
163 GLenum mode, GLenum texBaseFormat )
168 *state = default_combine_state;
170 switch (texBaseFormat) {
172 state->SourceRGB[0] = GL_PREVIOUS;
175 case GL_LUMINANCE_ALPHA:
186 state->SourceA[0] = GL_PREVIOUS;
191 "Invalid texBaseFormat 0x%x in calculate_derived_texenv",
196 if (mode == GL_REPLACE_EXT)
202 mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : mode;
207 mode_rgb = GL_INTERPOLATE;
210 state->SourceA[0] = GL_PREVIOUS;
212 /* Having alpha / luminance / intensity textures replace using the
213 * incoming fragment color matches the definition in NV_texture_shader.
214 * The 1.5 spec simply marks these as "undefined".
216 switch (texBaseFormat) {
219 case GL_LUMINANCE_ALPHA:
221 state->SourceRGB[0] = GL_PREVIOUS;
228 mode_rgb = GL_REPLACE;
231 state->SourceRGB[2] = GL_TEXTURE;
237 mode_rgb = GL_INTERPOLATE;
238 mode_a = GL_MODULATE;
240 switch (texBaseFormat) {
242 mode_rgb = GL_REPLACE;
245 mode_a = GL_INTERPOLATE;
246 state->SourceA[0] = GL_CONSTANT;
247 state->OperandA[2] = GL_SRC_ALPHA;
253 case GL_LUMINANCE_ALPHA:
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;
266 mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : GL_ADD;
267 mode_a = (texBaseFormat == GL_INTENSITY) ? GL_ADD : GL_MODULATE;
272 "Invalid texture env mode 0x%x in calculate_derived_texenv",
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;
286 /* GL_ARB_multitexture */
288 _mesa_ActiveTexture(GLenum texture)
290 const GLuint texUnit = texture - GL_TEXTURE0;
292 GET_CURRENT_CONTEXT(ctx);
294 /* See OpenGL spec for glActiveTexture: */
295 k = MAX2(ctx->Const.MaxCombinedTextureImageUnits,
296 ctx->Const.MaxTextureCoordUnits);
298 ASSERT(k <= Elements(ctx->Texture.Unit));
300 if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
301 _mesa_debug(ctx, "glActiveTexture %s\n",
302 _mesa_lookup_enum_by_nr(texture));
305 _mesa_error(ctx, GL_INVALID_ENUM, "glActiveTexture(texture=%s)",
306 _mesa_lookup_enum_by_nr(texture));
310 if (ctx->Texture.CurrentUnit == texUnit)
313 FLUSH_VERTICES(ctx, _NEW_TEXTURE);
315 ctx->Texture.CurrentUnit = texUnit;
316 if (ctx->Transform.MatrixMode == GL_TEXTURE) {
317 /* update current stack pointer */
318 ctx->CurrentStack = &ctx->TextureMatrixStack[texUnit];
323 /* GL_ARB_multitexture */
325 _mesa_ClientActiveTexture(GLenum texture)
327 GET_CURRENT_CONTEXT(ctx);
328 GLuint texUnit = texture - GL_TEXTURE0;
330 if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
331 _mesa_debug(ctx, "glClientActiveTexture %s\n",
332 _mesa_lookup_enum_by_nr(texture));
334 if (texUnit >= ctx->Const.MaxTextureCoordUnits) {
335 _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)");
339 if (ctx->Array.ActiveTexture == texUnit)
342 FLUSH_VERTICES(ctx, _NEW_ARRAY);
343 ctx->Array.ActiveTexture = texUnit;
348 /**********************************************************************/
349 /***** State management *****/
350 /**********************************************************************/
354 * \note This routine refers to derived texture attribute values to
355 * compute the ENABLE_TEXMAT flags, but is only called on
356 * _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
357 * flags are updated by _mesa_update_textures(), below.
359 * \param ctx GL context.
362 update_texture_matrices( struct gl_context *ctx )
366 ctx->Texture._TexMatEnabled = 0x0;
368 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
369 ASSERT(u < Elements(ctx->TextureMatrixStack));
370 if (_math_matrix_is_dirty(ctx->TextureMatrixStack[u].Top)) {
371 _math_matrix_analyse( ctx->TextureMatrixStack[u].Top );
373 if (ctx->Texture.Unit[u]._ReallyEnabled &&
374 ctx->TextureMatrixStack[u].Top->type != MATRIX_IDENTITY)
375 ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(u);
382 * Examine texture unit's combine/env state to update derived state.
385 update_tex_combine(struct gl_context *ctx, struct gl_texture_unit *texUnit)
387 struct gl_tex_env_combine_state *combine;
389 /* No combiners will apply to this. */
390 if (texUnit->_Current->Target == GL_TEXTURE_BUFFER)
393 /* Set the texUnit->_CurrentCombine field to point to the user's combiner
394 * state, or the combiner state which is derived from traditional texenv
397 if (texUnit->EnvMode == GL_COMBINE ||
398 texUnit->EnvMode == GL_COMBINE4_NV) {
399 texUnit->_CurrentCombine = & texUnit->Combine;
402 const struct gl_texture_object *texObj = texUnit->_Current;
403 GLenum format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat;
405 if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
406 format = texObj->DepthMode;
408 calculate_derived_texenv(&texUnit->_EnvMode, texUnit->EnvMode, format);
409 texUnit->_CurrentCombine = & texUnit->_EnvMode;
412 combine = texUnit->_CurrentCombine;
414 /* Determine number of source RGB terms in the combiner function */
415 switch (combine->ModeRGB) {
417 combine->_NumArgsRGB = 1;
421 if (texUnit->EnvMode == GL_COMBINE4_NV)
422 combine->_NumArgsRGB = 4;
424 combine->_NumArgsRGB = 2;
430 case GL_DOT3_RGB_EXT:
431 case GL_DOT3_RGBA_EXT:
432 combine->_NumArgsRGB = 2;
435 case GL_MODULATE_ADD_ATI:
436 case GL_MODULATE_SIGNED_ADD_ATI:
437 case GL_MODULATE_SUBTRACT_ATI:
438 combine->_NumArgsRGB = 3;
440 case GL_BUMP_ENVMAP_ATI:
441 /* no real arguments for this case */
442 combine->_NumArgsRGB = 0;
445 combine->_NumArgsRGB = 0;
446 _mesa_problem(ctx, "invalid RGB combine mode in update_texture_state");
450 /* Determine number of source Alpha terms in the combiner function */
451 switch (combine->ModeA) {
453 combine->_NumArgsA = 1;
457 if (texUnit->EnvMode == GL_COMBINE4_NV)
458 combine->_NumArgsA = 4;
460 combine->_NumArgsA = 2;
464 combine->_NumArgsA = 2;
467 case GL_MODULATE_ADD_ATI:
468 case GL_MODULATE_SIGNED_ADD_ATI:
469 case GL_MODULATE_SUBTRACT_ATI:
470 combine->_NumArgsA = 3;
473 combine->_NumArgsA = 0;
474 _mesa_problem(ctx, "invalid Alpha combine mode in update_texture_state");
480 update_texgen(struct gl_context *ctx)
484 /* Setup texgen for those texture coordinate sets that are in use */
485 for (unit = 0; unit < ctx->Const.MaxTextureCoordUnits; unit++) {
486 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
488 texUnit->_GenFlags = 0x0;
490 if (!(ctx->Texture._EnabledCoordUnits & (1 << unit)))
493 if (texUnit->TexGenEnabled) {
494 if (texUnit->TexGenEnabled & S_BIT) {
495 texUnit->_GenFlags |= texUnit->GenS._ModeBit;
497 if (texUnit->TexGenEnabled & T_BIT) {
498 texUnit->_GenFlags |= texUnit->GenT._ModeBit;
500 if (texUnit->TexGenEnabled & R_BIT) {
501 texUnit->_GenFlags |= texUnit->GenR._ModeBit;
503 if (texUnit->TexGenEnabled & Q_BIT) {
504 texUnit->_GenFlags |= texUnit->GenQ._ModeBit;
507 ctx->Texture._TexGenEnabled |= ENABLE_TEXGEN(unit);
508 ctx->Texture._GenFlags |= texUnit->_GenFlags;
511 ASSERT(unit < Elements(ctx->TextureMatrixStack));
512 if (ctx->TextureMatrixStack[unit].Top->type != MATRIX_IDENTITY)
513 ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(unit);
518 * \note This routine refers to derived texture matrix values to
519 * compute the ENABLE_TEXMAT flags, but is only called on
520 * _NEW_TEXTURE. On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
521 * flags are updated by _mesa_update_texture_matrices, above.
523 * \param ctx GL context.
526 update_texture_state( struct gl_context *ctx )
529 struct gl_program *fprog = NULL;
530 struct gl_program *vprog = NULL;
531 GLbitfield enabledFragUnits = 0x0;
533 if (ctx->Shader.CurrentVertexProgram &&
534 ctx->Shader.CurrentVertexProgram->LinkStatus) {
535 vprog = ctx->Shader.CurrentVertexProgram->_LinkedShaders[MESA_SHADER_VERTEX]->Program;
538 if (ctx->Shader.CurrentFragmentProgram &&
539 ctx->Shader.CurrentFragmentProgram->LinkStatus) {
540 fprog = ctx->Shader.CurrentFragmentProgram->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program;
542 else if (ctx->FragmentProgram._Enabled) {
543 fprog = &ctx->FragmentProgram.Current->Base;
546 /* FINISHME: Geometry shader texture accesses should also be considered
550 /* TODO: only set this if there are actual changes */
551 ctx->NewState |= _NEW_TEXTURE;
553 ctx->Texture._EnabledUnits = 0x0;
554 ctx->Texture._GenFlags = 0x0;
555 ctx->Texture._TexMatEnabled = 0x0;
556 ctx->Texture._TexGenEnabled = 0x0;
559 * Update texture unit state.
561 for (unit = 0; unit < ctx->Const.MaxCombinedTextureImageUnits; unit++) {
562 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
563 GLbitfield enabledVertTargets = 0x0;
564 GLbitfield enabledFragTargets = 0x0;
565 GLbitfield enabledTargets = 0x0;
568 /* Get the bitmask of texture target enables.
569 * enableBits will be a mask of the TEXTURE_*_BIT flags indicating
570 * which texture targets are enabled (fixed function) or referenced
571 * by a fragment program/program. When multiple flags are set, we'll
572 * settle on the one with highest priority (see below).
575 enabledVertTargets |= vprog->TexturesUsed[unit];
579 enabledFragTargets |= fprog->TexturesUsed[unit];
582 /* fixed-function fragment program */
583 enabledFragTargets |= texUnit->Enabled;
586 enabledTargets = enabledVertTargets | enabledFragTargets;
588 texUnit->_ReallyEnabled = 0x0;
590 if (enabledTargets == 0x0) {
591 /* neither vertex nor fragment processing uses this unit */
595 /* Look for the highest priority texture target that's enabled (or used
596 * by the vert/frag shaders) and "complete". That's the one we'll use
597 * for texturing. If we're using vert/frag program we're guaranteed
598 * that bitcount(enabledBits) <= 1.
599 * Note that the TEXTURE_x_INDEX values are in high to low priority.
601 for (texIndex = 0; texIndex < NUM_TEXTURE_TARGETS; texIndex++) {
602 if (enabledTargets & (1 << texIndex)) {
603 struct gl_texture_object *texObj = texUnit->CurrentTex[texIndex];
604 struct gl_sampler_object *sampler = texUnit->Sampler ?
605 texUnit->Sampler : &texObj->Sampler;
607 if (!_mesa_is_texture_complete(texObj, sampler)) {
608 _mesa_test_texobj_completeness(ctx, texObj);
610 if (_mesa_is_texture_complete(texObj, sampler)) {
611 texUnit->_ReallyEnabled = 1 << texIndex;
612 _mesa_reference_texobj(&texUnit->_Current, texObj);
618 if (!texUnit->_ReallyEnabled) {
620 /* If we get here it means the shader is expecting a texture
621 * object, but there isn't one (or it's incomplete). Use the
624 struct gl_texture_object *texObj;
625 gl_texture_index texTarget;
627 assert(_mesa_bitcount(enabledTargets) == 1);
629 texTarget = (gl_texture_index) (ffs(enabledTargets) - 1);
630 texObj = _mesa_get_fallback_texture(ctx, texTarget);
634 /* invalid fallback texture: don't enable the texture unit */
638 _mesa_reference_texobj(&texUnit->_Current, texObj);
639 texUnit->_ReallyEnabled = 1 << texTarget;
642 /* fixed-function: texture unit is really disabled */
647 /* if we get here, we know this texture unit is enabled */
649 ctx->Texture._EnabledUnits |= (1 << unit);
651 if (enabledFragTargets)
652 enabledFragUnits |= (1 << unit);
655 update_tex_combine(ctx, texUnit);
659 /* Determine which texture coordinate sets are actually needed */
661 const GLuint coordMask = (1 << MAX_TEXTURE_COORD_UNITS) - 1;
662 ctx->Texture._EnabledCoordUnits
663 = (fprog->InputsRead >> VARYING_SLOT_TEX0) & coordMask;
666 ctx->Texture._EnabledCoordUnits = enabledFragUnits;
669 if (!fprog || !vprog)
675 * Update texture-related derived state.
678 _mesa_update_texture( struct gl_context *ctx, GLuint new_state )
680 if (new_state & _NEW_TEXTURE_MATRIX)
681 update_texture_matrices( ctx );
683 if (new_state & (_NEW_TEXTURE | _NEW_PROGRAM))
684 update_texture_state( ctx );
688 /**********************************************************************/
689 /***** Initialization *****/
690 /**********************************************************************/
693 * Allocate the proxy textures for the given context.
695 * \param ctx the context to allocate proxies for.
697 * \return GL_TRUE on success, or GL_FALSE on failure
699 * If run out of memory part way through the allocations, clean up and return
703 alloc_proxy_textures( struct gl_context *ctx )
705 /* NOTE: these values must be in the same order as the TEXTURE_x_INDEX
708 static const GLenum targets[] = {
709 GL_TEXTURE_2D_MULTISAMPLE,
710 GL_TEXTURE_2D_MULTISAMPLE_ARRAY,
711 GL_TEXTURE_CUBE_MAP_ARRAY,
713 GL_TEXTURE_2D_ARRAY_EXT,
714 GL_TEXTURE_1D_ARRAY_EXT,
715 GL_TEXTURE_EXTERNAL_OES,
716 GL_TEXTURE_CUBE_MAP_ARB,
718 GL_TEXTURE_RECTANGLE_NV,
724 STATIC_ASSERT(Elements(targets) == NUM_TEXTURE_TARGETS);
725 assert(targets[TEXTURE_2D_INDEX] == GL_TEXTURE_2D);
726 assert(targets[TEXTURE_CUBE_INDEX] == GL_TEXTURE_CUBE_MAP);
728 for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
729 if (!(ctx->Texture.ProxyTex[tgt]
730 = ctx->Driver.NewTextureObject(ctx, 0, targets[tgt]))) {
731 /* out of memory, free what we did allocate */
733 ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
739 assert(ctx->Texture.ProxyTex[0]->RefCount == 1); /* sanity check */
745 * Initialize a texture unit.
747 * \param ctx GL context.
748 * \param unit texture unit number to be initialized.
751 init_texture_unit( struct gl_context *ctx, GLuint unit )
753 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
756 texUnit->EnvMode = GL_MODULATE;
757 ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 );
759 texUnit->Combine = default_combine_state;
760 texUnit->_EnvMode = default_combine_state;
761 texUnit->_CurrentCombine = & texUnit->_EnvMode;
762 texUnit->BumpTarget = GL_TEXTURE0;
764 texUnit->TexGenEnabled = 0x0;
765 texUnit->GenS.Mode = GL_EYE_LINEAR;
766 texUnit->GenT.Mode = GL_EYE_LINEAR;
767 texUnit->GenR.Mode = GL_EYE_LINEAR;
768 texUnit->GenQ.Mode = GL_EYE_LINEAR;
769 texUnit->GenS._ModeBit = TEXGEN_EYE_LINEAR;
770 texUnit->GenT._ModeBit = TEXGEN_EYE_LINEAR;
771 texUnit->GenR._ModeBit = TEXGEN_EYE_LINEAR;
772 texUnit->GenQ._ModeBit = TEXGEN_EYE_LINEAR;
774 /* Yes, these plane coefficients are correct! */
775 ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 );
776 ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 );
777 ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
778 ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
779 ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 );
780 ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 );
781 ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 );
782 ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 );
784 /* no mention of this in spec, but maybe id matrix expected? */
785 ASSIGN_4V( texUnit->RotMatrix, 1.0, 0.0, 0.0, 1.0 );
787 /* initialize current texture object ptrs to the shared default objects */
788 for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
789 _mesa_reference_texobj(&texUnit->CurrentTex[tex],
790 ctx->Shared->DefaultTex[tex]);
796 * Initialize texture state for the given context.
799 _mesa_init_texture(struct gl_context *ctx)
804 ctx->Texture.CurrentUnit = 0; /* multitexture */
805 ctx->Texture._EnabledUnits = 0x0;
807 for (u = 0; u < Elements(ctx->Texture.Unit); u++)
808 init_texture_unit(ctx, u);
810 /* After we're done initializing the context's texture state the default
811 * texture objects' refcounts should be at least
812 * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
814 assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount
815 >= MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1);
817 /* Allocate proxy textures */
818 if (!alloc_proxy_textures( ctx ))
821 /* GL_ARB_texture_buffer_object */
822 _mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject,
823 ctx->Shared->NullBufferObj);
830 * Free dynamically-allocted texture data attached to the given context.
833 _mesa_free_texture_data(struct gl_context *ctx)
837 /* unreference current textures */
838 for (u = 0; u < Elements(ctx->Texture.Unit); u++) {
839 /* The _Current texture could account for another reference */
840 _mesa_reference_texobj(&ctx->Texture.Unit[u]._Current, NULL);
842 for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
843 _mesa_reference_texobj(&ctx->Texture.Unit[u].CurrentTex[tgt], NULL);
847 /* Free proxy texture objects */
848 for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++)
849 ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
851 /* GL_ARB_texture_buffer_object */
852 _mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject, NULL);
854 for (u = 0; u < Elements(ctx->Texture.Unit); u++) {
855 _mesa_reference_sampler_object(ctx, &ctx->Texture.Unit[u].Sampler, NULL);
861 * Update the default texture objects in the given context to reference those
862 * specified in the shared state and release those referencing the old
866 _mesa_update_default_objects_texture(struct gl_context *ctx)
870 for (u = 0; u < Elements(ctx->Texture.Unit); u++) {
871 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
872 for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
873 _mesa_reference_texobj(&texUnit->CurrentTex[tex],
874 ctx->Shared->DefaultTex[tex]);