2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
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.
28 * Texture state handling.
33 #include "bufferobj.h"
41 #include "util/bitset.h"
45 * Default texture combine environment state. This is used to initialize
46 * a context's texture units and as the basis for converting "classic"
47 * texture environmnets to ARB_texture_env_combine style values.
49 static const struct gl_tex_env_combine_state default_combine_state
= {
50 GL_MODULATE
, GL_MODULATE
,
51 { GL_TEXTURE
, GL_PREVIOUS
, GL_CONSTANT
, GL_CONSTANT
},
52 { GL_TEXTURE
, GL_PREVIOUS
, GL_CONSTANT
, GL_CONSTANT
},
53 { GL_SRC_COLOR
, GL_SRC_COLOR
, GL_SRC_ALPHA
, GL_SRC_ALPHA
},
54 { GL_SRC_ALPHA
, GL_SRC_ALPHA
, GL_SRC_ALPHA
, GL_SRC_ALPHA
},
62 * Used by glXCopyContext to copy texture state from one context to another.
65 _mesa_copy_texture_state( const struct gl_context
*src
, struct gl_context
*dst
)
72 dst
->Texture
.CurrentUnit
= src
->Texture
.CurrentUnit
;
73 dst
->Texture
._GenFlags
= src
->Texture
._GenFlags
;
74 dst
->Texture
._TexGenEnabled
= src
->Texture
._TexGenEnabled
;
75 dst
->Texture
._TexMatEnabled
= src
->Texture
._TexMatEnabled
;
78 for (u
= 0; u
< src
->Const
.MaxCombinedTextureImageUnits
; u
++) {
79 dst
->Texture
.Unit
[u
].Enabled
= src
->Texture
.Unit
[u
].Enabled
;
80 dst
->Texture
.Unit
[u
].EnvMode
= src
->Texture
.Unit
[u
].EnvMode
;
81 COPY_4V(dst
->Texture
.Unit
[u
].EnvColor
, src
->Texture
.Unit
[u
].EnvColor
);
82 dst
->Texture
.Unit
[u
].TexGenEnabled
= src
->Texture
.Unit
[u
].TexGenEnabled
;
83 dst
->Texture
.Unit
[u
].GenS
= src
->Texture
.Unit
[u
].GenS
;
84 dst
->Texture
.Unit
[u
].GenT
= src
->Texture
.Unit
[u
].GenT
;
85 dst
->Texture
.Unit
[u
].GenR
= src
->Texture
.Unit
[u
].GenR
;
86 dst
->Texture
.Unit
[u
].GenQ
= src
->Texture
.Unit
[u
].GenQ
;
87 dst
->Texture
.Unit
[u
].LodBias
= src
->Texture
.Unit
[u
].LodBias
;
89 /* GL_EXT_texture_env_combine */
90 dst
->Texture
.Unit
[u
].Combine
= src
->Texture
.Unit
[u
].Combine
;
93 * XXX strictly speaking, we should compare texture names/ids and
94 * bind textures in the dest context according to id. For now, only
95 * copy bindings if the contexts share the same pool of textures to
96 * avoid refcounting bugs.
98 if (dst
->Shared
== src
->Shared
) {
99 /* copy texture object bindings, not contents of texture objects */
100 _mesa_lock_context_textures(dst
);
102 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
103 _mesa_reference_texobj(&dst
->Texture
.Unit
[u
].CurrentTex
[tex
],
104 src
->Texture
.Unit
[u
].CurrentTex
[tex
]);
105 if (src
->Texture
.Unit
[u
].CurrentTex
[tex
]) {
106 dst
->Texture
.NumCurrentTexUsed
=
107 MAX2(dst
->Texture
.NumCurrentTexUsed
, u
+ 1);
110 dst
->Texture
.Unit
[u
]._BoundTextures
= src
->Texture
.Unit
[u
]._BoundTextures
;
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_enum_to_string(texUnit
->EnvMode
));
126 printf(" GL_COMBINE_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.ModeRGB
));
127 printf(" GL_COMBINE_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.ModeA
));
128 printf(" GL_SOURCE0_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceRGB
[0]));
129 printf(" GL_SOURCE1_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceRGB
[1]));
130 printf(" GL_SOURCE2_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceRGB
[2]));
131 printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceA
[0]));
132 printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceA
[1]));
133 printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceA
[2]));
134 printf(" GL_OPERAND0_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandRGB
[0]));
135 printf(" GL_OPERAND1_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandRGB
[1]));
136 printf(" GL_OPERAND2_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandRGB
[2]));
137 printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandA
[0]));
138 printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandA
[1]));
139 printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_enum_to_string(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
:
185 state
->SourceA
[0] = GL_PREVIOUS
;
190 "Invalid texBaseFormat 0x%x in calculate_derived_texenv",
195 if (mode
== GL_REPLACE_EXT
)
201 mode_rgb
= (texBaseFormat
== GL_ALPHA
) ? GL_REPLACE
: mode
;
206 mode_rgb
= GL_INTERPOLATE
;
209 state
->SourceA
[0] = GL_PREVIOUS
;
211 /* Having alpha / luminance / intensity textures replace using the
212 * incoming fragment color matches the definition in NV_texture_shader.
213 * The 1.5 spec simply marks these as "undefined".
215 switch (texBaseFormat
) {
218 case GL_LUMINANCE_ALPHA
:
220 state
->SourceRGB
[0] = GL_PREVIOUS
;
226 mode_rgb
= GL_REPLACE
;
229 state
->SourceRGB
[2] = GL_TEXTURE
;
235 mode_rgb
= GL_INTERPOLATE
;
236 mode_a
= GL_MODULATE
;
238 switch (texBaseFormat
) {
240 mode_rgb
= GL_REPLACE
;
243 mode_a
= GL_INTERPOLATE
;
244 state
->SourceA
[0] = GL_CONSTANT
;
245 state
->OperandA
[2] = GL_SRC_ALPHA
;
251 case GL_LUMINANCE_ALPHA
:
254 state
->SourceRGB
[2] = GL_TEXTURE
;
255 state
->SourceA
[2] = GL_TEXTURE
;
256 state
->SourceRGB
[0] = GL_CONSTANT
;
257 state
->OperandRGB
[2] = GL_SRC_COLOR
;
263 mode_rgb
= (texBaseFormat
== GL_ALPHA
) ? GL_REPLACE
: GL_ADD
;
264 mode_a
= (texBaseFormat
== GL_INTENSITY
) ? GL_ADD
: GL_MODULATE
;
269 "Invalid texture env mode 0x%x in calculate_derived_texenv",
274 state
->ModeRGB
= (state
->SourceRGB
[0] != GL_PREVIOUS
)
275 ? mode_rgb
: GL_REPLACE
;
276 state
->ModeA
= (state
->SourceA
[0] != GL_PREVIOUS
)
277 ? mode_a
: GL_REPLACE
;
283 /* GL_ARB_multitexture */
285 _mesa_ActiveTexture(GLenum texture
)
287 const GLuint texUnit
= texture
- GL_TEXTURE0
;
289 GET_CURRENT_CONTEXT(ctx
);
291 if (MESA_VERBOSE
& (VERBOSE_API
|VERBOSE_TEXTURE
))
292 _mesa_debug(ctx
, "glActiveTexture %s\n",
293 _mesa_enum_to_string(texture
));
295 if (ctx
->Texture
.CurrentUnit
== texUnit
)
298 k
= _mesa_max_tex_unit(ctx
);
300 assert(k
<= ARRAY_SIZE(ctx
->Texture
.Unit
));
303 _mesa_error(ctx
, GL_INVALID_ENUM
, "glActiveTexture(texture=%s)",
304 _mesa_enum_to_string(texture
));
308 FLUSH_VERTICES(ctx
, _NEW_TEXTURE
);
310 ctx
->Texture
.CurrentUnit
= texUnit
;
311 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
312 /* update current stack pointer */
313 ctx
->CurrentStack
= &ctx
->TextureMatrixStack
[texUnit
];
318 /* GL_ARB_multitexture */
320 _mesa_ClientActiveTexture(GLenum texture
)
322 GET_CURRENT_CONTEXT(ctx
);
323 GLuint texUnit
= texture
- GL_TEXTURE0
;
325 if (MESA_VERBOSE
& (VERBOSE_API
| VERBOSE_TEXTURE
))
326 _mesa_debug(ctx
, "glClientActiveTexture %s\n",
327 _mesa_enum_to_string(texture
));
329 if (ctx
->Array
.ActiveTexture
== texUnit
)
332 if (texUnit
>= ctx
->Const
.MaxTextureCoordUnits
) {
333 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClientActiveTexture(texture=%s)",
334 _mesa_enum_to_string(texture
));
338 FLUSH_VERTICES(ctx
, _NEW_ARRAY
);
339 ctx
->Array
.ActiveTexture
= texUnit
;
344 /**********************************************************************/
345 /***** State management *****/
346 /**********************************************************************/
350 * \note This routine refers to derived texture attribute values to
351 * compute the ENABLE_TEXMAT flags, but is only called on
352 * _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
353 * flags are updated by _mesa_update_textures(), below.
355 * \param ctx GL context.
358 update_texture_matrices( struct gl_context
*ctx
)
362 ctx
->Texture
._TexMatEnabled
= 0x0;
364 for (u
= 0; u
< ctx
->Const
.MaxTextureCoordUnits
; u
++) {
365 assert(u
< ARRAY_SIZE(ctx
->TextureMatrixStack
));
366 if (_math_matrix_is_dirty(ctx
->TextureMatrixStack
[u
].Top
)) {
367 _math_matrix_analyse( ctx
->TextureMatrixStack
[u
].Top
);
369 if (ctx
->Texture
.Unit
[u
]._Current
&&
370 ctx
->TextureMatrixStack
[u
].Top
->type
!= MATRIX_IDENTITY
)
371 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(u
);
378 * Examine texture unit's combine/env state to update derived state.
381 update_tex_combine(struct gl_context
*ctx
, struct gl_texture_unit
*texUnit
)
383 struct gl_tex_env_combine_state
*combine
;
385 /* No combiners will apply to this. */
386 if (texUnit
->_Current
->Target
== GL_TEXTURE_BUFFER
)
389 /* Set the texUnit->_CurrentCombine field to point to the user's combiner
390 * state, or the combiner state which is derived from traditional texenv
393 if (texUnit
->EnvMode
== GL_COMBINE
||
394 texUnit
->EnvMode
== GL_COMBINE4_NV
) {
395 texUnit
->_CurrentCombine
= & texUnit
->Combine
;
398 const struct gl_texture_object
*texObj
= texUnit
->_Current
;
399 GLenum format
= texObj
->Image
[0][texObj
->BaseLevel
]->_BaseFormat
;
401 if (format
== GL_DEPTH_COMPONENT
|| format
== GL_DEPTH_STENCIL_EXT
) {
402 format
= texObj
->DepthMode
;
404 calculate_derived_texenv(&texUnit
->_EnvMode
, texUnit
->EnvMode
, format
);
405 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
408 combine
= texUnit
->_CurrentCombine
;
410 /* Determine number of source RGB terms in the combiner function */
411 switch (combine
->ModeRGB
) {
413 combine
->_NumArgsRGB
= 1;
417 if (texUnit
->EnvMode
== GL_COMBINE4_NV
)
418 combine
->_NumArgsRGB
= 4;
420 combine
->_NumArgsRGB
= 2;
426 case GL_DOT3_RGB_EXT
:
427 case GL_DOT3_RGBA_EXT
:
428 combine
->_NumArgsRGB
= 2;
431 case GL_MODULATE_ADD_ATI
:
432 case GL_MODULATE_SIGNED_ADD_ATI
:
433 case GL_MODULATE_SUBTRACT_ATI
:
434 combine
->_NumArgsRGB
= 3;
437 combine
->_NumArgsRGB
= 0;
438 _mesa_problem(ctx
, "invalid RGB combine mode in update_texture_state");
442 /* Determine number of source Alpha terms in the combiner function */
443 switch (combine
->ModeA
) {
445 combine
->_NumArgsA
= 1;
449 if (texUnit
->EnvMode
== GL_COMBINE4_NV
)
450 combine
->_NumArgsA
= 4;
452 combine
->_NumArgsA
= 2;
456 combine
->_NumArgsA
= 2;
459 case GL_MODULATE_ADD_ATI
:
460 case GL_MODULATE_SIGNED_ADD_ATI
:
461 case GL_MODULATE_SUBTRACT_ATI
:
462 combine
->_NumArgsA
= 3;
465 combine
->_NumArgsA
= 0;
466 _mesa_problem(ctx
, "invalid Alpha combine mode in update_texture_state");
472 update_texgen(struct gl_context
*ctx
)
476 /* Setup texgen for those texture coordinate sets that are in use */
477 for (unit
= 0; unit
< ctx
->Const
.MaxTextureCoordUnits
; unit
++) {
478 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
480 texUnit
->_GenFlags
= 0x0;
482 if (!(ctx
->Texture
._EnabledCoordUnits
& (1 << unit
)))
485 if (texUnit
->TexGenEnabled
) {
486 if (texUnit
->TexGenEnabled
& S_BIT
) {
487 texUnit
->_GenFlags
|= texUnit
->GenS
._ModeBit
;
489 if (texUnit
->TexGenEnabled
& T_BIT
) {
490 texUnit
->_GenFlags
|= texUnit
->GenT
._ModeBit
;
492 if (texUnit
->TexGenEnabled
& R_BIT
) {
493 texUnit
->_GenFlags
|= texUnit
->GenR
._ModeBit
;
495 if (texUnit
->TexGenEnabled
& Q_BIT
) {
496 texUnit
->_GenFlags
|= texUnit
->GenQ
._ModeBit
;
499 ctx
->Texture
._TexGenEnabled
|= ENABLE_TEXGEN(unit
);
500 ctx
->Texture
._GenFlags
|= texUnit
->_GenFlags
;
503 assert(unit
< ARRAY_SIZE(ctx
->TextureMatrixStack
));
504 if (ctx
->TextureMatrixStack
[unit
].Top
->type
!= MATRIX_IDENTITY
)
505 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(unit
);
509 static struct gl_texture_object
*
510 update_single_program_texture(struct gl_context
*ctx
, struct gl_program
*prog
,
513 gl_texture_index target_index
;
514 struct gl_texture_unit
*texUnit
;
515 struct gl_texture_object
*texObj
;
516 struct gl_sampler_object
*sampler
;
519 if (!(prog
->SamplersUsed
& (1 << s
)))
522 unit
= prog
->SamplerUnits
[s
];
523 texUnit
= &ctx
->Texture
.Unit
[unit
];
525 /* Note: If more than one bit was set in TexturesUsed[unit], then we should
526 * have had the draw call rejected already. From the GL 4.4 specification,
527 * section 7.10 ("Samplers"):
529 * "It is not allowed to have variables of different sampler types
530 * pointing to the same texture image unit within a program
531 * object. This situation can only be detected at the next rendering
532 * command issued which triggers shader invocations, and an
533 * INVALID_OPERATION error will then be generated."
535 target_index
= ffs(prog
->TexturesUsed
[unit
]) - 1;
536 texObj
= texUnit
->CurrentTex
[target_index
];
538 sampler
= texUnit
->Sampler
?
539 texUnit
->Sampler
: &texObj
->Sampler
;
541 if (likely(texObj
)) {
542 if (_mesa_is_texture_complete(texObj
, sampler
))
545 _mesa_test_texobj_completeness(ctx
, texObj
);
546 if (_mesa_is_texture_complete(texObj
, sampler
))
550 /* If we've reached this point, we didn't find a complete texture of the
551 * shader's target. From the GL 4.4 core specification, section 11.1.3.5
552 * ("Texture Access"):
554 * "If a sampler is used in a shader and the sampler’s associated
555 * texture is not complete, as defined in section 8.17, (0, 0, 0, 1)
556 * will be returned for a non-shadow sampler and 0 for a shadow
559 * Mesa implements this by creating a hidden texture object with a pixel of
562 texObj
= _mesa_get_fallback_texture(ctx
, target_index
);
569 update_program_texture_state(struct gl_context
*ctx
, struct gl_program
**prog
,
570 BITSET_WORD
*enabled_texture_units
)
574 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
580 /* We can't only do the shifting trick as the loop condition because if
581 * sampler 31 is active, the next iteration tries to shift by 32, which is
584 for (s
= 0; s
< MAX_SAMPLERS
&& (1 << s
) <= prog
[i
]->SamplersUsed
; s
++) {
585 struct gl_texture_object
*texObj
;
587 texObj
= update_single_program_texture(ctx
, prog
[i
], s
);
589 int unit
= prog
[i
]->SamplerUnits
[s
];
590 _mesa_reference_texobj(&ctx
->Texture
.Unit
[unit
]._Current
, texObj
);
591 BITSET_SET(enabled_texture_units
, unit
);
592 ctx
->Texture
._MaxEnabledTexImageUnit
=
593 MAX2(ctx
->Texture
._MaxEnabledTexImageUnit
, (int)unit
);
598 if (prog
[MESA_SHADER_FRAGMENT
]) {
599 const GLuint coordMask
= (1 << MAX_TEXTURE_COORD_UNITS
) - 1;
600 ctx
->Texture
._EnabledCoordUnits
|=
601 (prog
[MESA_SHADER_FRAGMENT
]->InputsRead
>> VARYING_SLOT_TEX0
) &
607 update_ff_texture_state(struct gl_context
*ctx
,
608 BITSET_WORD
*enabled_texture_units
)
612 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
613 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
616 if (texUnit
->Enabled
== 0x0)
619 /* If a shader already dictated what texture target was used for this
620 * unit, just go along with it.
622 if (BITSET_TEST(enabled_texture_units
, unit
))
625 /* From the GL 4.4 compat specification, section 16.2 ("Texture Application"):
627 * "Texturing is enabled or disabled using the generic Enable and
628 * Disable commands, respectively, with the symbolic constants
629 * TEXTURE_1D, TEXTURE_2D, TEXTURE_RECTANGLE, TEXTURE_3D, or
630 * TEXTURE_CUBE_MAP to enable the one-, two-, rectangular,
631 * three-dimensional, or cube map texture, respectively. If more
632 * than one of these textures is enabled, the first one enabled
633 * from the following list is used:
635 * • cube map texture
636 * • three-dimensional texture
637 * • rectangular texture
638 * • two-dimensional texture
639 * • one-dimensional texture"
641 * Note that the TEXTURE_x_INDEX values are in high to low priority.
644 * "If a texture unit is disabled or has an invalid or incomplete
645 * texture (as defined in section 8.17) bound to it, then blending
646 * is disabled for that texture unit. If the texture environment
647 * for a given enabled texture unit references a disabled texture
648 * unit, or an invalid or incomplete texture that is bound to
649 * another unit, then the results of texture blending are
652 for (texIndex
= 0; texIndex
< NUM_TEXTURE_TARGETS
; texIndex
++) {
653 if (texUnit
->Enabled
& (1 << texIndex
)) {
654 struct gl_texture_object
*texObj
= texUnit
->CurrentTex
[texIndex
];
655 struct gl_sampler_object
*sampler
= texUnit
->Sampler
?
656 texUnit
->Sampler
: &texObj
->Sampler
;
658 if (!_mesa_is_texture_complete(texObj
, sampler
)) {
659 _mesa_test_texobj_completeness(ctx
, texObj
);
661 if (_mesa_is_texture_complete(texObj
, sampler
)) {
662 _mesa_reference_texobj(&texUnit
->_Current
, texObj
);
668 if (texIndex
== NUM_TEXTURE_TARGETS
)
671 /* if we get here, we know this texture unit is enabled */
672 BITSET_SET(enabled_texture_units
, unit
);
673 ctx
->Texture
._MaxEnabledTexImageUnit
=
674 MAX2(ctx
->Texture
._MaxEnabledTexImageUnit
, (int)unit
);
676 ctx
->Texture
._EnabledCoordUnits
|= 1 << unit
;
678 update_tex_combine(ctx
, texUnit
);
683 * \note This routine refers to derived texture matrix values to
684 * compute the ENABLE_TEXMAT flags, but is only called on
685 * _NEW_TEXTURE. On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
686 * flags are updated by _mesa_update_texture_matrices, above.
688 * \param ctx GL context.
691 update_texture_state( struct gl_context
*ctx
)
693 struct gl_program
*prog
[MESA_SHADER_STAGES
];
695 int old_max_unit
= ctx
->Texture
._MaxEnabledTexImageUnit
;
696 BITSET_DECLARE(enabled_texture_units
, MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
698 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
699 if (ctx
->_Shader
->CurrentProgram
[i
] &&
700 ctx
->_Shader
->CurrentProgram
[i
]->LinkStatus
) {
701 prog
[i
] = ctx
->_Shader
->CurrentProgram
[i
]->_LinkedShaders
[i
]->Program
;
703 if (i
== MESA_SHADER_FRAGMENT
&& ctx
->FragmentProgram
._Enabled
)
704 prog
[i
] = &ctx
->FragmentProgram
.Current
->Base
;
710 /* TODO: only set this if there are actual changes */
711 ctx
->NewState
|= _NEW_TEXTURE
;
713 ctx
->Texture
._GenFlags
= 0x0;
714 ctx
->Texture
._TexMatEnabled
= 0x0;
715 ctx
->Texture
._TexGenEnabled
= 0x0;
716 ctx
->Texture
._MaxEnabledTexImageUnit
= -1;
717 ctx
->Texture
._EnabledCoordUnits
= 0x0;
719 memset(&enabled_texture_units
, 0, sizeof(enabled_texture_units
));
721 /* First, walk over our programs pulling in all the textures for them.
722 * Programs dictate specific texture targets to be enabled, and for a draw
723 * call to be valid they can't conflict about which texture targets are
726 update_program_texture_state(ctx
, prog
, enabled_texture_units
);
728 /* Also pull in any textures necessary for fixed function fragment shading.
730 if (!prog
[MESA_SHADER_FRAGMENT
])
731 update_ff_texture_state(ctx
, enabled_texture_units
);
733 /* Now, clear out the _Current of any disabled texture units. */
734 for (i
= 0; i
<= ctx
->Texture
._MaxEnabledTexImageUnit
; i
++) {
735 if (!BITSET_TEST(enabled_texture_units
, i
))
736 _mesa_reference_texobj(&ctx
->Texture
.Unit
[i
]._Current
, NULL
);
738 for (i
= ctx
->Texture
._MaxEnabledTexImageUnit
+ 1; i
<= old_max_unit
; i
++) {
739 _mesa_reference_texobj(&ctx
->Texture
.Unit
[i
]._Current
, NULL
);
742 if (!prog
[MESA_SHADER_FRAGMENT
] || !prog
[MESA_SHADER_VERTEX
])
748 * Update texture-related derived state.
751 _mesa_update_texture( struct gl_context
*ctx
, GLuint new_state
)
753 if (new_state
& _NEW_TEXTURE_MATRIX
)
754 update_texture_matrices( ctx
);
756 if (new_state
& (_NEW_TEXTURE
| _NEW_PROGRAM
))
757 update_texture_state( ctx
);
761 /**********************************************************************/
762 /***** Initialization *****/
763 /**********************************************************************/
766 * Allocate the proxy textures for the given context.
768 * \param ctx the context to allocate proxies for.
770 * \return GL_TRUE on success, or GL_FALSE on failure
772 * If run out of memory part way through the allocations, clean up and return
776 alloc_proxy_textures( struct gl_context
*ctx
)
778 /* NOTE: these values must be in the same order as the TEXTURE_x_INDEX
781 static const GLenum targets
[] = {
782 GL_TEXTURE_2D_MULTISAMPLE
,
783 GL_TEXTURE_2D_MULTISAMPLE_ARRAY
,
784 GL_TEXTURE_CUBE_MAP_ARRAY
,
786 GL_TEXTURE_2D_ARRAY_EXT
,
787 GL_TEXTURE_1D_ARRAY_EXT
,
788 GL_TEXTURE_EXTERNAL_OES
,
791 GL_TEXTURE_RECTANGLE_NV
,
797 STATIC_ASSERT(ARRAY_SIZE(targets
) == NUM_TEXTURE_TARGETS
);
798 assert(targets
[TEXTURE_2D_INDEX
] == GL_TEXTURE_2D
);
799 assert(targets
[TEXTURE_CUBE_INDEX
] == GL_TEXTURE_CUBE_MAP
);
801 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
802 if (!(ctx
->Texture
.ProxyTex
[tgt
]
803 = ctx
->Driver
.NewTextureObject(ctx
, 0, targets
[tgt
]))) {
804 /* out of memory, free what we did allocate */
806 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
812 assert(ctx
->Texture
.ProxyTex
[0]->RefCount
== 1); /* sanity check */
818 * Initialize a texture unit.
820 * \param ctx GL context.
821 * \param unit texture unit number to be initialized.
824 init_texture_unit( struct gl_context
*ctx
, GLuint unit
)
826 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
829 texUnit
->EnvMode
= GL_MODULATE
;
830 ASSIGN_4V( texUnit
->EnvColor
, 0.0, 0.0, 0.0, 0.0 );
832 texUnit
->Combine
= default_combine_state
;
833 texUnit
->_EnvMode
= default_combine_state
;
834 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
836 texUnit
->TexGenEnabled
= 0x0;
837 texUnit
->GenS
.Mode
= GL_EYE_LINEAR
;
838 texUnit
->GenT
.Mode
= GL_EYE_LINEAR
;
839 texUnit
->GenR
.Mode
= GL_EYE_LINEAR
;
840 texUnit
->GenQ
.Mode
= GL_EYE_LINEAR
;
841 texUnit
->GenS
._ModeBit
= TEXGEN_EYE_LINEAR
;
842 texUnit
->GenT
._ModeBit
= TEXGEN_EYE_LINEAR
;
843 texUnit
->GenR
._ModeBit
= TEXGEN_EYE_LINEAR
;
844 texUnit
->GenQ
._ModeBit
= TEXGEN_EYE_LINEAR
;
846 /* Yes, these plane coefficients are correct! */
847 ASSIGN_4V( texUnit
->GenS
.ObjectPlane
, 1.0, 0.0, 0.0, 0.0 );
848 ASSIGN_4V( texUnit
->GenT
.ObjectPlane
, 0.0, 1.0, 0.0, 0.0 );
849 ASSIGN_4V( texUnit
->GenR
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
850 ASSIGN_4V( texUnit
->GenQ
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
851 ASSIGN_4V( texUnit
->GenS
.EyePlane
, 1.0, 0.0, 0.0, 0.0 );
852 ASSIGN_4V( texUnit
->GenT
.EyePlane
, 0.0, 1.0, 0.0, 0.0 );
853 ASSIGN_4V( texUnit
->GenR
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
854 ASSIGN_4V( texUnit
->GenQ
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
856 /* initialize current texture object ptrs to the shared default objects */
857 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
858 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
859 ctx
->Shared
->DefaultTex
[tex
]);
862 texUnit
->_BoundTextures
= 0;
867 * Initialize texture state for the given context.
870 _mesa_init_texture(struct gl_context
*ctx
)
875 ctx
->Texture
.CurrentUnit
= 0; /* multitexture */
877 /* Appendix F.2 of the OpenGL ES 3.0 spec says:
879 * "OpenGL ES 3.0 requires that all cube map filtering be
880 * seamless. OpenGL ES 2.0 specified that a single cube map face be
881 * selected and used for filtering."
883 * Unfortunatley, a call to _mesa_is_gles3 below will only work if
884 * the driver has already computed and set ctx->Version, however drivers
885 * seem to call _mesa_initialize_context (which calls this) early
886 * in the CreateContext hook and _mesa_compute_version much later (since
887 * it needs information about available extensions). So, we will
888 * enable seamless cubemaps by default since GLES2. This should work
889 * for most implementations and drivers that don't support seamless
890 * cubemaps for GLES2 can still disable it.
892 ctx
->Texture
.CubeMapSeamless
= ctx
->API
== API_OPENGLES2
;
894 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++)
895 init_texture_unit(ctx
, u
);
897 /* After we're done initializing the context's texture state the default
898 * texture objects' refcounts should be at least
899 * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
901 assert(ctx
->Shared
->DefaultTex
[TEXTURE_1D_INDEX
]->RefCount
902 >= MAX_COMBINED_TEXTURE_IMAGE_UNITS
+ 1);
904 /* Allocate proxy textures */
905 if (!alloc_proxy_textures( ctx
))
908 /* GL_ARB_texture_buffer_object */
909 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
,
910 ctx
->Shared
->NullBufferObj
);
912 ctx
->Texture
.NumCurrentTexUsed
= 0;
919 * Free dynamically-allocted texture data attached to the given context.
922 _mesa_free_texture_data(struct gl_context
*ctx
)
926 /* unreference current textures */
927 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
928 /* The _Current texture could account for another reference */
929 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
]._Current
, NULL
);
931 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
932 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
].CurrentTex
[tgt
], NULL
);
936 /* Free proxy texture objects */
937 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++)
938 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
940 /* GL_ARB_texture_buffer_object */
941 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
, NULL
);
943 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
944 _mesa_reference_sampler_object(ctx
, &ctx
->Texture
.Unit
[u
].Sampler
, NULL
);
950 * Update the default texture objects in the given context to reference those
951 * specified in the shared state and release those referencing the old
955 _mesa_update_default_objects_texture(struct gl_context
*ctx
)
959 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
960 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[u
];
961 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
962 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
963 ctx
->Shared
->DefaultTex
[tex
]);