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 "mfeatures.h"
33 #include "bufferobj.h"
47 * Default texture combine environment state. This is used to initialize
48 * a context's texture units and as the basis for converting "classic"
49 * texture environmnets to ARB_texture_env_combine style values.
51 static const struct gl_tex_env_combine_state default_combine_state
= {
52 GL_MODULATE
, GL_MODULATE
,
53 { GL_TEXTURE
, GL_PREVIOUS
, GL_CONSTANT
, GL_CONSTANT
},
54 { GL_TEXTURE
, GL_PREVIOUS
, GL_CONSTANT
, GL_CONSTANT
},
55 { GL_SRC_COLOR
, GL_SRC_COLOR
, GL_SRC_ALPHA
, GL_SRC_ALPHA
},
56 { GL_SRC_ALPHA
, GL_SRC_ALPHA
, GL_SRC_ALPHA
, GL_SRC_ALPHA
},
64 * Used by glXCopyContext to copy texture state from one context to another.
67 _mesa_copy_texture_state( const struct gl_context
*src
, struct gl_context
*dst
)
74 dst
->Texture
.CurrentUnit
= src
->Texture
.CurrentUnit
;
75 dst
->Texture
._GenFlags
= src
->Texture
._GenFlags
;
76 dst
->Texture
._TexGenEnabled
= src
->Texture
._TexGenEnabled
;
77 dst
->Texture
._TexMatEnabled
= src
->Texture
._TexMatEnabled
;
80 for (u
= 0; u
< src
->Const
.MaxCombinedTextureImageUnits
; u
++) {
81 dst
->Texture
.Unit
[u
].Enabled
= src
->Texture
.Unit
[u
].Enabled
;
82 dst
->Texture
.Unit
[u
].EnvMode
= src
->Texture
.Unit
[u
].EnvMode
;
83 COPY_4V(dst
->Texture
.Unit
[u
].EnvColor
, src
->Texture
.Unit
[u
].EnvColor
);
84 dst
->Texture
.Unit
[u
].TexGenEnabled
= src
->Texture
.Unit
[u
].TexGenEnabled
;
85 dst
->Texture
.Unit
[u
].GenS
= src
->Texture
.Unit
[u
].GenS
;
86 dst
->Texture
.Unit
[u
].GenT
= src
->Texture
.Unit
[u
].GenT
;
87 dst
->Texture
.Unit
[u
].GenR
= src
->Texture
.Unit
[u
].GenR
;
88 dst
->Texture
.Unit
[u
].GenQ
= src
->Texture
.Unit
[u
].GenQ
;
89 dst
->Texture
.Unit
[u
].LodBias
= src
->Texture
.Unit
[u
].LodBias
;
91 /* GL_EXT_texture_env_combine */
92 dst
->Texture
.Unit
[u
].Combine
= src
->Texture
.Unit
[u
].Combine
;
94 /* GL_ATI_envmap_bumpmap - need this? */
95 dst
->Texture
.Unit
[u
].BumpTarget
= src
->Texture
.Unit
[u
].BumpTarget
;
96 COPY_4V(dst
->Texture
.Unit
[u
].RotMatrix
, src
->Texture
.Unit
[u
].RotMatrix
);
99 * XXX strictly speaking, we should compare texture names/ids and
100 * bind textures in the dest context according to id. For now, only
101 * copy bindings if the contexts share the same pool of textures to
102 * avoid refcounting bugs.
104 if (dst
->Shared
== src
->Shared
) {
105 /* copy texture object bindings, not contents of texture objects */
106 _mesa_lock_context_textures(dst
);
108 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
109 _mesa_reference_texobj(&dst
->Texture
.Unit
[u
].CurrentTex
[tex
],
110 src
->Texture
.Unit
[u
].CurrentTex
[tex
]);
112 _mesa_unlock_context_textures(dst
);
122 _mesa_print_texunit_state( struct gl_context
*ctx
, GLuint unit
)
124 const struct gl_texture_unit
*texUnit
= ctx
->Texture
.Unit
+ unit
;
125 printf("Texture Unit %d\n", unit
);
126 printf(" GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit
->EnvMode
));
127 printf(" GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.ModeRGB
));
128 printf(" GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.ModeA
));
129 printf(" GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceRGB
[0]));
130 printf(" GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceRGB
[1]));
131 printf(" GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceRGB
[2]));
132 printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceA
[0]));
133 printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceA
[1]));
134 printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceA
[2]));
135 printf(" GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandRGB
[0]));
136 printf(" GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandRGB
[1]));
137 printf(" GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandRGB
[2]));
138 printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandA
[0]));
139 printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandA
[1]));
140 printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandA
[2]));
141 printf(" GL_RGB_SCALE = %d\n", 1 << texUnit
->Combine
.ScaleShiftRGB
);
142 printf(" GL_ALPHA_SCALE = %d\n", 1 << texUnit
->Combine
.ScaleShiftA
);
143 printf(" GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit
->EnvColor
[0], texUnit
->EnvColor
[1], texUnit
->EnvColor
[2], texUnit
->EnvColor
[3]);
148 /**********************************************************************/
149 /* Texture Environment */
150 /**********************************************************************/
153 * Convert "classic" texture environment to ARB_texture_env_combine style
156 * \param state texture_env_combine state vector to be filled-in.
157 * \param mode Classic texture environment mode (i.e., \c GL_REPLACE,
158 * \c GL_BLEND, \c GL_DECAL, etc.).
159 * \param texBaseFormat Base format of the texture associated with the
163 calculate_derived_texenv( struct gl_tex_env_combine_state
*state
,
164 GLenum mode
, GLenum texBaseFormat
)
169 *state
= default_combine_state
;
171 switch (texBaseFormat
) {
173 state
->SourceRGB
[0] = GL_PREVIOUS
;
176 case GL_LUMINANCE_ALPHA
:
187 state
->SourceA
[0] = GL_PREVIOUS
;
192 "Invalid texBaseFormat 0x%x in calculate_derived_texenv",
197 if (mode
== GL_REPLACE_EXT
)
203 mode_rgb
= (texBaseFormat
== GL_ALPHA
) ? GL_REPLACE
: mode
;
208 mode_rgb
= GL_INTERPOLATE
;
211 state
->SourceA
[0] = GL_PREVIOUS
;
213 /* Having alpha / luminance / intensity textures replace using the
214 * incoming fragment color matches the definition in NV_texture_shader.
215 * The 1.5 spec simply marks these as "undefined".
217 switch (texBaseFormat
) {
220 case GL_LUMINANCE_ALPHA
:
222 state
->SourceRGB
[0] = GL_PREVIOUS
;
229 mode_rgb
= GL_REPLACE
;
232 state
->SourceRGB
[2] = GL_TEXTURE
;
238 mode_rgb
= GL_INTERPOLATE
;
239 mode_a
= GL_MODULATE
;
241 switch (texBaseFormat
) {
243 mode_rgb
= GL_REPLACE
;
246 mode_a
= GL_INTERPOLATE
;
247 state
->SourceA
[0] = GL_CONSTANT
;
248 state
->OperandA
[2] = GL_SRC_ALPHA
;
254 case GL_LUMINANCE_ALPHA
:
258 state
->SourceRGB
[2] = GL_TEXTURE
;
259 state
->SourceA
[2] = GL_TEXTURE
;
260 state
->SourceRGB
[0] = GL_CONSTANT
;
261 state
->OperandRGB
[2] = GL_SRC_COLOR
;
267 mode_rgb
= (texBaseFormat
== GL_ALPHA
) ? GL_REPLACE
: GL_ADD
;
268 mode_a
= (texBaseFormat
== GL_INTENSITY
) ? GL_ADD
: GL_MODULATE
;
273 "Invalid texture env mode 0x%x in calculate_derived_texenv",
278 state
->ModeRGB
= (state
->SourceRGB
[0] != GL_PREVIOUS
)
279 ? mode_rgb
: GL_REPLACE
;
280 state
->ModeA
= (state
->SourceA
[0] != GL_PREVIOUS
)
281 ? mode_a
: GL_REPLACE
;
287 /* GL_ARB_multitexture */
289 _mesa_ActiveTextureARB(GLenum texture
)
291 const GLuint texUnit
= texture
- GL_TEXTURE0
;
293 GET_CURRENT_CONTEXT(ctx
);
295 /* See OpenGL spec for glActiveTexture: */
296 k
= MAX2(ctx
->Const
.MaxCombinedTextureImageUnits
,
297 ctx
->Const
.MaxTextureCoordUnits
);
299 ASSERT(k
<= Elements(ctx
->Texture
.Unit
));
301 ASSERT_OUTSIDE_BEGIN_END(ctx
);
303 if (MESA_VERBOSE
& (VERBOSE_API
|VERBOSE_TEXTURE
))
304 _mesa_debug(ctx
, "glActiveTexture %s\n",
305 _mesa_lookup_enum_by_nr(texture
));
308 _mesa_error(ctx
, GL_INVALID_ENUM
, "glActiveTexture(texture=%s)",
309 _mesa_lookup_enum_by_nr(texture
));
313 if (ctx
->Texture
.CurrentUnit
== texUnit
)
316 FLUSH_VERTICES(ctx
, _NEW_TEXTURE
);
318 ctx
->Texture
.CurrentUnit
= texUnit
;
319 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
320 /* update current stack pointer */
321 ctx
->CurrentStack
= &ctx
->TextureMatrixStack
[texUnit
];
326 /* GL_ARB_multitexture */
328 _mesa_ClientActiveTextureARB(GLenum texture
)
330 GET_CURRENT_CONTEXT(ctx
);
331 GLuint texUnit
= texture
- GL_TEXTURE0
;
332 ASSERT_OUTSIDE_BEGIN_END(ctx
);
334 if (MESA_VERBOSE
& (VERBOSE_API
| VERBOSE_TEXTURE
))
335 _mesa_debug(ctx
, "glClientActiveTexture %s\n",
336 _mesa_lookup_enum_by_nr(texture
));
338 if (texUnit
>= ctx
->Const
.MaxTextureCoordUnits
) {
339 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClientActiveTexture(texture)");
343 if (ctx
->Array
.ActiveTexture
== texUnit
)
346 FLUSH_VERTICES(ctx
, _NEW_ARRAY
);
347 ctx
->Array
.ActiveTexture
= texUnit
;
352 /**********************************************************************/
353 /***** State management *****/
354 /**********************************************************************/
358 * \note This routine refers to derived texture attribute values to
359 * compute the ENABLE_TEXMAT flags, but is only called on
360 * _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
361 * flags are updated by _mesa_update_textures(), below.
363 * \param ctx GL context.
366 update_texture_matrices( struct gl_context
*ctx
)
370 ctx
->Texture
._TexMatEnabled
= 0x0;
372 for (u
= 0; u
< ctx
->Const
.MaxTextureCoordUnits
; u
++) {
373 ASSERT(u
< Elements(ctx
->TextureMatrixStack
));
374 if (_math_matrix_is_dirty(ctx
->TextureMatrixStack
[u
].Top
)) {
375 _math_matrix_analyse( ctx
->TextureMatrixStack
[u
].Top
);
377 if (ctx
->Texture
.Unit
[u
]._ReallyEnabled
&&
378 ctx
->TextureMatrixStack
[u
].Top
->type
!= MATRIX_IDENTITY
)
379 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(u
);
386 * Examine texture unit's combine/env state to update derived state.
389 update_tex_combine(struct gl_context
*ctx
, struct gl_texture_unit
*texUnit
)
391 struct gl_tex_env_combine_state
*combine
;
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
->Sampler
.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");
481 * \note This routine refers to derived texture matrix values to
482 * compute the ENABLE_TEXMAT flags, but is only called on
483 * _NEW_TEXTURE. On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
484 * flags are updated by _mesa_update_texture_matrices, above.
486 * \param ctx GL context.
489 update_texture_state( struct gl_context
*ctx
)
492 struct gl_fragment_program
*fprog
= NULL
;
493 struct gl_program
*vprog
= NULL
;
494 GLbitfield enabledFragUnits
= 0x0;
496 if (ctx
->Shader
.CurrentVertexProgram
&&
497 ctx
->Shader
.CurrentVertexProgram
->LinkStatus
) {
498 vprog
= ctx
->Shader
.CurrentVertexProgram
->_LinkedShaders
[MESA_SHADER_VERTEX
]->Program
;
499 } else if (ctx
->VertexProgram
._Enabled
) {
500 /* XXX enable this if/when non-shader vertex programs get
502 vprog = &ctx->VertexProgram.Current->Base;
506 if (ctx
->Shader
.CurrentFragmentProgram
&&
507 ctx
->Shader
.CurrentFragmentProgram
->LinkStatus
) {
508 fprog
= ctx
->Shader
.CurrentFragmentProgram
->FragmentProgram
;
510 else if (ctx
->FragmentProgram
._Enabled
) {
511 fprog
= ctx
->FragmentProgram
.Current
;
514 /* FINISHME: Geometry shader texture accesses should also be considered
518 /* TODO: only set this if there are actual changes */
519 ctx
->NewState
|= _NEW_TEXTURE
;
521 ctx
->Texture
._EnabledUnits
= 0x0;
522 ctx
->Texture
._GenFlags
= 0x0;
523 ctx
->Texture
._TexMatEnabled
= 0x0;
524 ctx
->Texture
._TexGenEnabled
= 0x0;
527 * Update texture unit state.
529 for (unit
= 0; unit
< ctx
->Const
.MaxCombinedTextureImageUnits
; unit
++) {
530 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
531 GLbitfield enabledVertTargets
= 0x0;
532 GLbitfield enabledFragTargets
= 0x0;
533 GLbitfield enabledTargets
= 0x0;
536 /* Get the bitmask of texture target enables.
537 * enableBits will be a mask of the TEXTURE_*_BIT flags indicating
538 * which texture targets are enabled (fixed function) or referenced
539 * by a fragment program/program. When multiple flags are set, we'll
540 * settle on the one with highest priority (see below).
543 enabledVertTargets
|= vprog
->TexturesUsed
[unit
];
547 enabledFragTargets
|= fprog
->Base
.TexturesUsed
[unit
];
550 /* fixed-function fragment program */
551 enabledFragTargets
|= texUnit
->Enabled
;
554 enabledTargets
= enabledVertTargets
| enabledFragTargets
;
556 texUnit
->_ReallyEnabled
= 0x0;
558 if (enabledTargets
== 0x0) {
559 /* neither vertex nor fragment processing uses this unit */
563 /* Look for the highest priority texture target that's enabled (or used
564 * by the vert/frag shaders) and "complete". That's the one we'll use
565 * for texturing. If we're using vert/frag program we're guaranteed
566 * that bitcount(enabledBits) <= 1.
567 * Note that the TEXTURE_x_INDEX values are in high to low priority.
569 for (texIndex
= 0; texIndex
< NUM_TEXTURE_TARGETS
; texIndex
++) {
570 if (enabledTargets
& (1 << texIndex
)) {
571 struct gl_texture_object
*texObj
= texUnit
->CurrentTex
[texIndex
];
572 if (!texObj
->_Complete
) {
573 _mesa_test_texobj_completeness(ctx
, texObj
);
575 if (texObj
->_Complete
) {
576 texUnit
->_ReallyEnabled
= 1 << texIndex
;
577 _mesa_reference_texobj(&texUnit
->_Current
, texObj
);
583 if (!texUnit
->_ReallyEnabled
) {
585 /* If we get here it means the shader is expecting a texture
586 * object, but there isn't one (or it's incomplete). Use the
589 struct gl_texture_object
*texObj
= _mesa_get_fallback_texture(ctx
);
590 texUnit
->_ReallyEnabled
= 1 << TEXTURE_2D_INDEX
;
591 _mesa_reference_texobj(&texUnit
->_Current
, texObj
);
594 /* fixed-function: texture unit is really disabled */
599 /* if we get here, we know this texture unit is enabled */
601 ctx
->Texture
._EnabledUnits
|= (1 << unit
);
603 if (enabledFragTargets
)
604 enabledFragUnits
|= (1 << unit
);
606 update_tex_combine(ctx
, texUnit
);
610 /* Determine which texture coordinate sets are actually needed */
612 const GLuint coordMask
= (1 << MAX_TEXTURE_COORD_UNITS
) - 1;
613 ctx
->Texture
._EnabledCoordUnits
614 = (fprog
->Base
.InputsRead
>> FRAG_ATTRIB_TEX0
) & coordMask
;
617 ctx
->Texture
._EnabledCoordUnits
= enabledFragUnits
;
620 /* Setup texgen for those texture coordinate sets that are in use */
621 for (unit
= 0; unit
< ctx
->Const
.MaxTextureCoordUnits
; unit
++) {
622 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
624 texUnit
->_GenFlags
= 0x0;
626 if (!(ctx
->Texture
._EnabledCoordUnits
& (1 << unit
)))
629 if (texUnit
->TexGenEnabled
) {
630 if (texUnit
->TexGenEnabled
& S_BIT
) {
631 texUnit
->_GenFlags
|= texUnit
->GenS
._ModeBit
;
633 if (texUnit
->TexGenEnabled
& T_BIT
) {
634 texUnit
->_GenFlags
|= texUnit
->GenT
._ModeBit
;
636 if (texUnit
->TexGenEnabled
& R_BIT
) {
637 texUnit
->_GenFlags
|= texUnit
->GenR
._ModeBit
;
639 if (texUnit
->TexGenEnabled
& Q_BIT
) {
640 texUnit
->_GenFlags
|= texUnit
->GenQ
._ModeBit
;
643 ctx
->Texture
._TexGenEnabled
|= ENABLE_TEXGEN(unit
);
644 ctx
->Texture
._GenFlags
|= texUnit
->_GenFlags
;
647 ASSERT(unit
< Elements(ctx
->TextureMatrixStack
));
648 if (ctx
->TextureMatrixStack
[unit
].Top
->type
!= MATRIX_IDENTITY
)
649 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(unit
);
655 * Update texture-related derived state.
658 _mesa_update_texture( struct gl_context
*ctx
, GLuint new_state
)
660 if (new_state
& _NEW_TEXTURE_MATRIX
)
661 update_texture_matrices( ctx
);
663 if (new_state
& (_NEW_TEXTURE
| _NEW_PROGRAM
))
664 update_texture_state( ctx
);
668 /**********************************************************************/
669 /***** Initialization *****/
670 /**********************************************************************/
673 * Allocate the proxy textures for the given context.
675 * \param ctx the context to allocate proxies for.
677 * \return GL_TRUE on success, or GL_FALSE on failure
679 * If run out of memory part way through the allocations, clean up and return
683 alloc_proxy_textures( struct gl_context
*ctx
)
685 static const GLenum targets
[] = {
689 GL_TEXTURE_CUBE_MAP_ARB
,
690 GL_TEXTURE_RECTANGLE_NV
,
691 GL_TEXTURE_1D_ARRAY_EXT
,
692 GL_TEXTURE_2D_ARRAY_EXT
,
697 ASSERT(Elements(targets
) == NUM_TEXTURE_TARGETS
);
699 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
700 if (!(ctx
->Texture
.ProxyTex
[tgt
]
701 = ctx
->Driver
.NewTextureObject(ctx
, 0, targets
[tgt
]))) {
702 /* out of memory, free what we did allocate */
704 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
710 assert(ctx
->Texture
.ProxyTex
[0]->RefCount
== 1); /* sanity check */
716 * Initialize a texture unit.
718 * \param ctx GL context.
719 * \param unit texture unit number to be initialized.
722 init_texture_unit( struct gl_context
*ctx
, GLuint unit
)
724 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
727 texUnit
->EnvMode
= GL_MODULATE
;
728 ASSIGN_4V( texUnit
->EnvColor
, 0.0, 0.0, 0.0, 0.0 );
730 texUnit
->Combine
= default_combine_state
;
731 texUnit
->_EnvMode
= default_combine_state
;
732 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
733 texUnit
->BumpTarget
= GL_TEXTURE0
;
735 texUnit
->TexGenEnabled
= 0x0;
736 texUnit
->GenS
.Mode
= GL_EYE_LINEAR
;
737 texUnit
->GenT
.Mode
= GL_EYE_LINEAR
;
738 texUnit
->GenR
.Mode
= GL_EYE_LINEAR
;
739 texUnit
->GenQ
.Mode
= GL_EYE_LINEAR
;
740 texUnit
->GenS
._ModeBit
= TEXGEN_EYE_LINEAR
;
741 texUnit
->GenT
._ModeBit
= TEXGEN_EYE_LINEAR
;
742 texUnit
->GenR
._ModeBit
= TEXGEN_EYE_LINEAR
;
743 texUnit
->GenQ
._ModeBit
= TEXGEN_EYE_LINEAR
;
745 /* Yes, these plane coefficients are correct! */
746 ASSIGN_4V( texUnit
->GenS
.ObjectPlane
, 1.0, 0.0, 0.0, 0.0 );
747 ASSIGN_4V( texUnit
->GenT
.ObjectPlane
, 0.0, 1.0, 0.0, 0.0 );
748 ASSIGN_4V( texUnit
->GenR
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
749 ASSIGN_4V( texUnit
->GenQ
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
750 ASSIGN_4V( texUnit
->GenS
.EyePlane
, 1.0, 0.0, 0.0, 0.0 );
751 ASSIGN_4V( texUnit
->GenT
.EyePlane
, 0.0, 1.0, 0.0, 0.0 );
752 ASSIGN_4V( texUnit
->GenR
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
753 ASSIGN_4V( texUnit
->GenQ
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
755 /* no mention of this in spec, but maybe id matrix expected? */
756 ASSIGN_4V( texUnit
->RotMatrix
, 1.0, 0.0, 0.0, 1.0 );
758 /* initialize current texture object ptrs to the shared default objects */
759 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
760 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
761 ctx
->Shared
->DefaultTex
[tex
]);
767 * Initialize texture state for the given context.
770 _mesa_init_texture(struct gl_context
*ctx
)
775 ctx
->Texture
.CurrentUnit
= 0; /* multitexture */
776 ctx
->Texture
._EnabledUnits
= 0x0;
778 for (u
= 0; u
< Elements(ctx
->Texture
.Unit
); u
++)
779 init_texture_unit(ctx
, u
);
781 /* After we're done initializing the context's texture state the default
782 * texture objects' refcounts should be at least
783 * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
785 assert(ctx
->Shared
->DefaultTex
[TEXTURE_1D_INDEX
]->RefCount
786 >= MAX_COMBINED_TEXTURE_IMAGE_UNITS
+ 1);
788 /* Allocate proxy textures */
789 if (!alloc_proxy_textures( ctx
))
792 /* GL_ARB_texture_buffer_object */
793 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
,
794 ctx
->Shared
->NullBufferObj
);
801 * Free dynamically-allocted texture data attached to the given context.
804 _mesa_free_texture_data(struct gl_context
*ctx
)
808 /* unreference current textures */
809 for (u
= 0; u
< Elements(ctx
->Texture
.Unit
); u
++) {
810 /* The _Current texture could account for another reference */
811 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
]._Current
, NULL
);
813 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
814 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
].CurrentTex
[tgt
], NULL
);
818 /* Free proxy texture objects */
819 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++)
820 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
822 /* GL_ARB_texture_buffer_object */
823 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
, NULL
);
825 #if FEATURE_sampler_objects
826 for (u
= 0; u
< Elements(ctx
->Texture
.Unit
); u
++) {
827 _mesa_reference_sampler_object(ctx
, &ctx
->Texture
.Unit
[u
].Sampler
, NULL
);
834 * Update the default texture objects in the given context to reference those
835 * specified in the shared state and release those referencing the old
839 _mesa_update_default_objects_texture(struct gl_context
*ctx
)
843 for (u
= 0; u
< Elements(ctx
->Texture
.Unit
); u
++) {
844 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[u
];
845 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
846 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
847 ctx
->Shared
->DefaultTex
[tex
]);