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.
32 #include "bufferobj.h"
38 #include "shaderimage.h"
43 #include "util/bitset.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
;
95 * XXX strictly speaking, we should compare texture names/ids and
96 * bind textures in the dest context according to id. For now, only
97 * copy bindings if the contexts share the same pool of textures to
98 * avoid refcounting bugs.
100 if (dst
->Shared
== src
->Shared
) {
101 /* copy texture object bindings, not contents of texture objects */
102 _mesa_lock_context_textures(dst
);
104 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
105 _mesa_reference_texobj(&dst
->Texture
.Unit
[u
].CurrentTex
[tex
],
106 src
->Texture
.Unit
[u
].CurrentTex
[tex
]);
107 if (src
->Texture
.Unit
[u
].CurrentTex
[tex
]) {
108 dst
->Texture
.NumCurrentTexUsed
=
109 MAX2(dst
->Texture
.NumCurrentTexUsed
, u
+ 1);
112 dst
->Texture
.Unit
[u
]._BoundTextures
= src
->Texture
.Unit
[u
]._BoundTextures
;
113 _mesa_unlock_context_textures(dst
);
123 _mesa_print_texunit_state( struct gl_context
*ctx
, GLuint unit
)
125 const struct gl_texture_unit
*texUnit
= ctx
->Texture
.Unit
+ unit
;
126 printf("Texture Unit %d\n", unit
);
127 printf(" GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit
->EnvMode
));
128 printf(" GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.ModeRGB
));
129 printf(" GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.ModeA
));
130 printf(" GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceRGB
[0]));
131 printf(" GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceRGB
[1]));
132 printf(" GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceRGB
[2]));
133 printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceA
[0]));
134 printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceA
[1]));
135 printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.SourceA
[2]));
136 printf(" GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandRGB
[0]));
137 printf(" GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandRGB
[1]));
138 printf(" GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandRGB
[2]));
139 printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandA
[0]));
140 printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandA
[1]));
141 printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit
->Combine
.OperandA
[2]));
142 printf(" GL_RGB_SCALE = %d\n", 1 << texUnit
->Combine
.ScaleShiftRGB
);
143 printf(" GL_ALPHA_SCALE = %d\n", 1 << texUnit
->Combine
.ScaleShiftA
);
144 printf(" GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit
->EnvColor
[0], texUnit
->EnvColor
[1], texUnit
->EnvColor
[2], texUnit
->EnvColor
[3]);
149 /**********************************************************************/
150 /* Texture Environment */
151 /**********************************************************************/
154 * Convert "classic" texture environment to ARB_texture_env_combine style
157 * \param state texture_env_combine state vector to be filled-in.
158 * \param mode Classic texture environment mode (i.e., \c GL_REPLACE,
159 * \c GL_BLEND, \c GL_DECAL, etc.).
160 * \param texBaseFormat Base format of the texture associated with the
164 calculate_derived_texenv( struct gl_tex_env_combine_state
*state
,
165 GLenum mode
, GLenum texBaseFormat
)
170 *state
= default_combine_state
;
172 switch (texBaseFormat
) {
174 state
->SourceRGB
[0] = GL_PREVIOUS
;
177 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
;
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
:
256 state
->SourceRGB
[2] = GL_TEXTURE
;
257 state
->SourceA
[2] = GL_TEXTURE
;
258 state
->SourceRGB
[0] = GL_CONSTANT
;
259 state
->OperandRGB
[2] = GL_SRC_COLOR
;
265 mode_rgb
= (texBaseFormat
== GL_ALPHA
) ? GL_REPLACE
: GL_ADD
;
266 mode_a
= (texBaseFormat
== GL_INTENSITY
) ? GL_ADD
: GL_MODULATE
;
271 "Invalid texture env mode 0x%x in calculate_derived_texenv",
276 state
->ModeRGB
= (state
->SourceRGB
[0] != GL_PREVIOUS
)
277 ? mode_rgb
: GL_REPLACE
;
278 state
->ModeA
= (state
->SourceA
[0] != GL_PREVIOUS
)
279 ? mode_a
: GL_REPLACE
;
285 /* GL_ARB_multitexture */
287 _mesa_ActiveTexture(GLenum texture
)
289 const GLuint texUnit
= texture
- GL_TEXTURE0
;
291 GET_CURRENT_CONTEXT(ctx
);
293 k
= _mesa_max_tex_unit(ctx
);
295 assert(k
<= ARRAY_SIZE(ctx
->Texture
.Unit
));
297 if (MESA_VERBOSE
& (VERBOSE_API
|VERBOSE_TEXTURE
))
298 _mesa_debug(ctx
, "glActiveTexture %s\n",
299 _mesa_lookup_enum_by_nr(texture
));
302 _mesa_error(ctx
, GL_INVALID_ENUM
, "glActiveTexture(texture=%s)",
303 _mesa_lookup_enum_by_nr(texture
));
307 if (ctx
->Texture
.CurrentUnit
== texUnit
)
310 FLUSH_VERTICES(ctx
, _NEW_TEXTURE
);
312 ctx
->Texture
.CurrentUnit
= texUnit
;
313 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
314 /* update current stack pointer */
315 ctx
->CurrentStack
= &ctx
->TextureMatrixStack
[texUnit
];
320 /* GL_ARB_multitexture */
322 _mesa_ClientActiveTexture(GLenum texture
)
324 GET_CURRENT_CONTEXT(ctx
);
325 GLuint texUnit
= texture
- GL_TEXTURE0
;
327 if (MESA_VERBOSE
& (VERBOSE_API
| VERBOSE_TEXTURE
))
328 _mesa_debug(ctx
, "glClientActiveTexture %s\n",
329 _mesa_lookup_enum_by_nr(texture
));
331 if (texUnit
>= ctx
->Const
.MaxTextureCoordUnits
) {
332 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClientActiveTexture(texture)");
336 if (ctx
->Array
.ActiveTexture
== texUnit
)
339 FLUSH_VERTICES(ctx
, _NEW_ARRAY
);
340 ctx
->Array
.ActiveTexture
= texUnit
;
345 /**********************************************************************/
346 /***** State management *****/
347 /**********************************************************************/
351 * \note This routine refers to derived texture attribute values to
352 * compute the ENABLE_TEXMAT flags, but is only called on
353 * _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
354 * flags are updated by _mesa_update_textures(), below.
356 * \param ctx GL context.
359 update_texture_matrices( struct gl_context
*ctx
)
363 ctx
->Texture
._TexMatEnabled
= 0x0;
365 for (u
= 0; u
< ctx
->Const
.MaxTextureCoordUnits
; u
++) {
366 assert(u
< ARRAY_SIZE(ctx
->TextureMatrixStack
));
367 if (_math_matrix_is_dirty(ctx
->TextureMatrixStack
[u
].Top
)) {
368 _math_matrix_analyse( ctx
->TextureMatrixStack
[u
].Top
);
370 if (ctx
->Texture
.Unit
[u
]._Current
&&
371 ctx
->TextureMatrixStack
[u
].Top
->type
!= MATRIX_IDENTITY
)
372 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(u
);
379 * Examine texture unit's combine/env state to update derived state.
382 update_tex_combine(struct gl_context
*ctx
, struct gl_texture_unit
*texUnit
)
384 struct gl_tex_env_combine_state
*combine
;
386 /* No combiners will apply to this. */
387 if (texUnit
->_Current
->Target
== GL_TEXTURE_BUFFER
)
390 /* Set the texUnit->_CurrentCombine field to point to the user's combiner
391 * state, or the combiner state which is derived from traditional texenv
394 if (texUnit
->EnvMode
== GL_COMBINE
||
395 texUnit
->EnvMode
== GL_COMBINE4_NV
) {
396 texUnit
->_CurrentCombine
= & texUnit
->Combine
;
399 const struct gl_texture_object
*texObj
= texUnit
->_Current
;
400 GLenum format
= texObj
->Image
[0][texObj
->BaseLevel
]->_BaseFormat
;
402 if (format
== GL_DEPTH_COMPONENT
|| format
== GL_DEPTH_STENCIL_EXT
) {
403 format
= texObj
->DepthMode
;
405 calculate_derived_texenv(&texUnit
->_EnvMode
, texUnit
->EnvMode
, format
);
406 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
409 combine
= texUnit
->_CurrentCombine
;
411 /* Determine number of source RGB terms in the combiner function */
412 switch (combine
->ModeRGB
) {
414 combine
->_NumArgsRGB
= 1;
418 if (texUnit
->EnvMode
== GL_COMBINE4_NV
)
419 combine
->_NumArgsRGB
= 4;
421 combine
->_NumArgsRGB
= 2;
427 case GL_DOT3_RGB_EXT
:
428 case GL_DOT3_RGBA_EXT
:
429 combine
->_NumArgsRGB
= 2;
432 case GL_MODULATE_ADD_ATI
:
433 case GL_MODULATE_SIGNED_ADD_ATI
:
434 case GL_MODULATE_SUBTRACT_ATI
:
435 combine
->_NumArgsRGB
= 3;
438 combine
->_NumArgsRGB
= 0;
439 _mesa_problem(ctx
, "invalid RGB combine mode in update_texture_state");
443 /* Determine number of source Alpha terms in the combiner function */
444 switch (combine
->ModeA
) {
446 combine
->_NumArgsA
= 1;
450 if (texUnit
->EnvMode
== GL_COMBINE4_NV
)
451 combine
->_NumArgsA
= 4;
453 combine
->_NumArgsA
= 2;
457 combine
->_NumArgsA
= 2;
460 case GL_MODULATE_ADD_ATI
:
461 case GL_MODULATE_SIGNED_ADD_ATI
:
462 case GL_MODULATE_SUBTRACT_ATI
:
463 combine
->_NumArgsA
= 3;
466 combine
->_NumArgsA
= 0;
467 _mesa_problem(ctx
, "invalid Alpha combine mode in update_texture_state");
473 update_texgen(struct gl_context
*ctx
)
477 /* Setup texgen for those texture coordinate sets that are in use */
478 for (unit
= 0; unit
< ctx
->Const
.MaxTextureCoordUnits
; unit
++) {
479 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
481 texUnit
->_GenFlags
= 0x0;
483 if (!(ctx
->Texture
._EnabledCoordUnits
& (1 << unit
)))
486 if (texUnit
->TexGenEnabled
) {
487 if (texUnit
->TexGenEnabled
& S_BIT
) {
488 texUnit
->_GenFlags
|= texUnit
->GenS
._ModeBit
;
490 if (texUnit
->TexGenEnabled
& T_BIT
) {
491 texUnit
->_GenFlags
|= texUnit
->GenT
._ModeBit
;
493 if (texUnit
->TexGenEnabled
& R_BIT
) {
494 texUnit
->_GenFlags
|= texUnit
->GenR
._ModeBit
;
496 if (texUnit
->TexGenEnabled
& Q_BIT
) {
497 texUnit
->_GenFlags
|= texUnit
->GenQ
._ModeBit
;
500 ctx
->Texture
._TexGenEnabled
|= ENABLE_TEXGEN(unit
);
501 ctx
->Texture
._GenFlags
|= texUnit
->_GenFlags
;
504 assert(unit
< ARRAY_SIZE(ctx
->TextureMatrixStack
));
505 if (ctx
->TextureMatrixStack
[unit
].Top
->type
!= MATRIX_IDENTITY
)
506 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(unit
);
510 static struct gl_texture_object
*
511 update_single_program_texture(struct gl_context
*ctx
, struct gl_program
*prog
,
514 gl_texture_index target_index
;
515 struct gl_texture_unit
*texUnit
;
516 struct gl_texture_object
*texObj
;
517 struct gl_sampler_object
*sampler
;
520 if (!(prog
->SamplersUsed
& (1 << s
)))
523 unit
= prog
->SamplerUnits
[s
];
524 texUnit
= &ctx
->Texture
.Unit
[unit
];
526 /* Note: If more than one bit was set in TexturesUsed[unit], then we should
527 * have had the draw call rejected already. From the GL 4.4 specification,
528 * section 7.10 ("Samplers"):
530 * "It is not allowed to have variables of different sampler types
531 * pointing to the same texture image unit within a program
532 * object. This situation can only be detected at the next rendering
533 * command issued which triggers shader invocations, and an
534 * INVALID_OPERATION error will then be generated."
536 target_index
= ffs(prog
->TexturesUsed
[unit
]) - 1;
537 texObj
= texUnit
->CurrentTex
[target_index
];
539 sampler
= texUnit
->Sampler
?
540 texUnit
->Sampler
: &texObj
->Sampler
;
542 if (likely(texObj
)) {
543 if (_mesa_is_texture_complete(texObj
, sampler
))
546 _mesa_test_texobj_completeness(ctx
, texObj
);
547 if (_mesa_is_texture_complete(texObj
, sampler
))
551 /* If we've reached this point, we didn't find a complete texture of the
552 * shader's target. From the GL 4.4 core specification, section 11.1.3.5
553 * ("Texture Access"):
555 * "If a sampler is used in a shader and the sampler’s associated
556 * texture is not complete, as defined in section 8.17, (0, 0, 0, 1)
557 * will be returned for a non-shadow sampler and 0 for a shadow
560 * Mesa implements this by creating a hidden texture object with a pixel of
563 texObj
= _mesa_get_fallback_texture(ctx
, target_index
);
570 update_program_texture_state(struct gl_context
*ctx
, struct gl_program
**prog
,
571 BITSET_WORD
*enabled_texture_units
)
575 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
581 /* We can't only do the shifting trick as the loop condition because if
582 * sampler 31 is active, the next iteration tries to shift by 32, which is
585 for (s
= 0; s
< MAX_SAMPLERS
&& (1 << s
) <= prog
[i
]->SamplersUsed
; s
++) {
586 struct gl_texture_object
*texObj
;
588 texObj
= update_single_program_texture(ctx
, prog
[i
], s
);
590 int unit
= prog
[i
]->SamplerUnits
[s
];
591 _mesa_reference_texobj(&ctx
->Texture
.Unit
[unit
]._Current
, texObj
);
592 BITSET_SET(enabled_texture_units
, unit
);
593 ctx
->Texture
._MaxEnabledTexImageUnit
=
594 MAX2(ctx
->Texture
._MaxEnabledTexImageUnit
, (int)unit
);
599 if (prog
[MESA_SHADER_FRAGMENT
]) {
600 const GLuint coordMask
= (1 << MAX_TEXTURE_COORD_UNITS
) - 1;
601 ctx
->Texture
._EnabledCoordUnits
|=
602 (prog
[MESA_SHADER_FRAGMENT
]->InputsRead
>> VARYING_SLOT_TEX0
) &
608 update_ff_texture_state(struct gl_context
*ctx
,
609 BITSET_WORD
*enabled_texture_units
)
613 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
614 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
617 if (texUnit
->Enabled
== 0x0)
620 /* If a shader already dictated what texture target was used for this
621 * unit, just go along with it.
623 if (BITSET_TEST(enabled_texture_units
, unit
))
626 /* From the GL 4.4 compat specification, section 16.2 ("Texture Application"):
628 * "Texturing is enabled or disabled using the generic Enable and
629 * Disable commands, respectively, with the symbolic constants
630 * TEXTURE_1D, TEXTURE_2D, TEXTURE_RECTANGLE, TEXTURE_3D, or
631 * TEXTURE_CUBE_MAP to enable the one-, two-, rectangular,
632 * three-dimensional, or cube map texture, respectively. If more
633 * than one of these textures is enabled, the first one enabled
634 * from the following list is used:
636 * • cube map texture
637 * • three-dimensional texture
638 * • rectangular texture
639 * • two-dimensional texture
640 * • one-dimensional texture"
642 * Note that the TEXTURE_x_INDEX values are in high to low priority.
645 * "If a texture unit is disabled or has an invalid or incomplete
646 * texture (as defined in section 8.17) bound to it, then blending
647 * is disabled for that texture unit. If the texture environment
648 * for a given enabled texture unit references a disabled texture
649 * unit, or an invalid or incomplete texture that is bound to
650 * another unit, then the results of texture blending are
653 for (texIndex
= 0; texIndex
< NUM_TEXTURE_TARGETS
; texIndex
++) {
654 if (texUnit
->Enabled
& (1 << texIndex
)) {
655 struct gl_texture_object
*texObj
= texUnit
->CurrentTex
[texIndex
];
656 struct gl_sampler_object
*sampler
= texUnit
->Sampler
?
657 texUnit
->Sampler
: &texObj
->Sampler
;
659 if (!_mesa_is_texture_complete(texObj
, sampler
)) {
660 _mesa_test_texobj_completeness(ctx
, texObj
);
662 if (_mesa_is_texture_complete(texObj
, sampler
)) {
663 _mesa_reference_texobj(&texUnit
->_Current
, texObj
);
669 if (texIndex
== NUM_TEXTURE_TARGETS
)
672 /* if we get here, we know this texture unit is enabled */
673 BITSET_SET(enabled_texture_units
, unit
);
674 ctx
->Texture
._MaxEnabledTexImageUnit
=
675 MAX2(ctx
->Texture
._MaxEnabledTexImageUnit
, (int)unit
);
677 ctx
->Texture
._EnabledCoordUnits
|= 1 << unit
;
679 update_tex_combine(ctx
, texUnit
);
684 * \note This routine refers to derived texture matrix values to
685 * compute the ENABLE_TEXMAT flags, but is only called on
686 * _NEW_TEXTURE. On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
687 * flags are updated by _mesa_update_texture_matrices, above.
689 * \param ctx GL context.
692 update_texture_state( struct gl_context
*ctx
)
694 struct gl_program
*prog
[MESA_SHADER_STAGES
];
696 int old_max_unit
= ctx
->Texture
._MaxEnabledTexImageUnit
;
697 BITSET_DECLARE(enabled_texture_units
, MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
699 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
700 if (ctx
->_Shader
->CurrentProgram
[i
] &&
701 ctx
->_Shader
->CurrentProgram
[i
]->LinkStatus
) {
702 prog
[i
] = ctx
->_Shader
->CurrentProgram
[i
]->_LinkedShaders
[i
]->Program
;
704 if (i
== MESA_SHADER_FRAGMENT
&& ctx
->FragmentProgram
._Enabled
)
705 prog
[i
] = &ctx
->FragmentProgram
.Current
->Base
;
711 /* TODO: only set this if there are actual changes */
712 ctx
->NewState
|= _NEW_TEXTURE
;
714 ctx
->Texture
._GenFlags
= 0x0;
715 ctx
->Texture
._TexMatEnabled
= 0x0;
716 ctx
->Texture
._TexGenEnabled
= 0x0;
717 ctx
->Texture
._MaxEnabledTexImageUnit
= -1;
718 ctx
->Texture
._EnabledCoordUnits
= 0x0;
720 memset(&enabled_texture_units
, 0, sizeof(enabled_texture_units
));
722 /* First, walk over our programs pulling in all the textures for them.
723 * Programs dictate specific texture targets to be enabled, and for a draw
724 * call to be valid they can't conflict about which texture targets are
727 update_program_texture_state(ctx
, prog
, enabled_texture_units
);
729 /* Also pull in any textures necessary for fixed function fragment shading.
731 if (!prog
[MESA_SHADER_FRAGMENT
])
732 update_ff_texture_state(ctx
, enabled_texture_units
);
734 /* Now, clear out the _Current of any disabled texture units. */
735 for (i
= 0; i
<= ctx
->Texture
._MaxEnabledTexImageUnit
; i
++) {
736 if (!BITSET_TEST(enabled_texture_units
, i
))
737 _mesa_reference_texobj(&ctx
->Texture
.Unit
[i
]._Current
, NULL
);
739 for (i
= ctx
->Texture
._MaxEnabledTexImageUnit
+ 1; i
<= old_max_unit
; i
++) {
740 _mesa_reference_texobj(&ctx
->Texture
.Unit
[i
]._Current
, NULL
);
743 if (!prog
[MESA_SHADER_FRAGMENT
] || !prog
[MESA_SHADER_VERTEX
])
746 _mesa_validate_image_units(ctx
);
751 * Update texture-related derived state.
754 _mesa_update_texture( struct gl_context
*ctx
, GLuint new_state
)
756 if (new_state
& _NEW_TEXTURE_MATRIX
)
757 update_texture_matrices( ctx
);
759 if (new_state
& (_NEW_TEXTURE
| _NEW_PROGRAM
))
760 update_texture_state( ctx
);
764 /**********************************************************************/
765 /***** Initialization *****/
766 /**********************************************************************/
769 * Allocate the proxy textures for the given context.
771 * \param ctx the context to allocate proxies for.
773 * \return GL_TRUE on success, or GL_FALSE on failure
775 * If run out of memory part way through the allocations, clean up and return
779 alloc_proxy_textures( struct gl_context
*ctx
)
781 /* NOTE: these values must be in the same order as the TEXTURE_x_INDEX
784 static const GLenum targets
[] = {
785 GL_TEXTURE_2D_MULTISAMPLE
,
786 GL_TEXTURE_2D_MULTISAMPLE_ARRAY
,
787 GL_TEXTURE_CUBE_MAP_ARRAY
,
789 GL_TEXTURE_2D_ARRAY_EXT
,
790 GL_TEXTURE_1D_ARRAY_EXT
,
791 GL_TEXTURE_EXTERNAL_OES
,
792 GL_TEXTURE_CUBE_MAP_ARB
,
794 GL_TEXTURE_RECTANGLE_NV
,
800 STATIC_ASSERT(ARRAY_SIZE(targets
) == NUM_TEXTURE_TARGETS
);
801 assert(targets
[TEXTURE_2D_INDEX
] == GL_TEXTURE_2D
);
802 assert(targets
[TEXTURE_CUBE_INDEX
] == GL_TEXTURE_CUBE_MAP
);
804 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
805 if (!(ctx
->Texture
.ProxyTex
[tgt
]
806 = ctx
->Driver
.NewTextureObject(ctx
, 0, targets
[tgt
]))) {
807 /* out of memory, free what we did allocate */
809 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
815 assert(ctx
->Texture
.ProxyTex
[0]->RefCount
== 1); /* sanity check */
821 * Initialize a texture unit.
823 * \param ctx GL context.
824 * \param unit texture unit number to be initialized.
827 init_texture_unit( struct gl_context
*ctx
, GLuint unit
)
829 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
832 texUnit
->EnvMode
= GL_MODULATE
;
833 ASSIGN_4V( texUnit
->EnvColor
, 0.0, 0.0, 0.0, 0.0 );
835 texUnit
->Combine
= default_combine_state
;
836 texUnit
->_EnvMode
= default_combine_state
;
837 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
839 texUnit
->TexGenEnabled
= 0x0;
840 texUnit
->GenS
.Mode
= GL_EYE_LINEAR
;
841 texUnit
->GenT
.Mode
= GL_EYE_LINEAR
;
842 texUnit
->GenR
.Mode
= GL_EYE_LINEAR
;
843 texUnit
->GenQ
.Mode
= GL_EYE_LINEAR
;
844 texUnit
->GenS
._ModeBit
= TEXGEN_EYE_LINEAR
;
845 texUnit
->GenT
._ModeBit
= TEXGEN_EYE_LINEAR
;
846 texUnit
->GenR
._ModeBit
= TEXGEN_EYE_LINEAR
;
847 texUnit
->GenQ
._ModeBit
= TEXGEN_EYE_LINEAR
;
849 /* Yes, these plane coefficients are correct! */
850 ASSIGN_4V( texUnit
->GenS
.ObjectPlane
, 1.0, 0.0, 0.0, 0.0 );
851 ASSIGN_4V( texUnit
->GenT
.ObjectPlane
, 0.0, 1.0, 0.0, 0.0 );
852 ASSIGN_4V( texUnit
->GenR
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
853 ASSIGN_4V( texUnit
->GenQ
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
854 ASSIGN_4V( texUnit
->GenS
.EyePlane
, 1.0, 0.0, 0.0, 0.0 );
855 ASSIGN_4V( texUnit
->GenT
.EyePlane
, 0.0, 1.0, 0.0, 0.0 );
856 ASSIGN_4V( texUnit
->GenR
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
857 ASSIGN_4V( texUnit
->GenQ
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
859 /* initialize current texture object ptrs to the shared default objects */
860 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
861 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
862 ctx
->Shared
->DefaultTex
[tex
]);
865 texUnit
->_BoundTextures
= 0;
870 * Initialize texture state for the given context.
873 _mesa_init_texture(struct gl_context
*ctx
)
878 ctx
->Texture
.CurrentUnit
= 0; /* multitexture */
880 /* Appendix F.2 of the OpenGL ES 3.0 spec says:
882 * "OpenGL ES 3.0 requires that all cube map filtering be
883 * seamless. OpenGL ES 2.0 specified that a single cube map face be
884 * selected and used for filtering."
886 * Unfortunatley, a call to _mesa_is_gles3 below will only work if
887 * the driver has already computed and set ctx->Version, however drivers
888 * seem to call _mesa_initialize_context (which calls this) early
889 * in the CreateContext hook and _mesa_compute_version much later (since
890 * it needs information about available extensions). So, we will
891 * enable seamless cubemaps by default since GLES2. This should work
892 * for most implementations and drivers that don't support seamless
893 * cubemaps for GLES2 can still disable it.
895 ctx
->Texture
.CubeMapSeamless
= ctx
->API
== API_OPENGLES2
;
897 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++)
898 init_texture_unit(ctx
, u
);
900 /* After we're done initializing the context's texture state the default
901 * texture objects' refcounts should be at least
902 * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
904 assert(ctx
->Shared
->DefaultTex
[TEXTURE_1D_INDEX
]->RefCount
905 >= MAX_COMBINED_TEXTURE_IMAGE_UNITS
+ 1);
907 /* Allocate proxy textures */
908 if (!alloc_proxy_textures( ctx
))
911 /* GL_ARB_texture_buffer_object */
912 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
,
913 ctx
->Shared
->NullBufferObj
);
915 ctx
->Texture
.NumCurrentTexUsed
= 0;
922 * Free dynamically-allocted texture data attached to the given context.
925 _mesa_free_texture_data(struct gl_context
*ctx
)
929 /* unreference current textures */
930 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
931 /* The _Current texture could account for another reference */
932 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
]._Current
, NULL
);
934 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
935 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
].CurrentTex
[tgt
], NULL
);
939 /* Free proxy texture objects */
940 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++)
941 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
943 /* GL_ARB_texture_buffer_object */
944 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
, NULL
);
946 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
947 _mesa_reference_sampler_object(ctx
, &ctx
->Texture
.Unit
[u
].Sampler
, NULL
);
953 * Update the default texture objects in the given context to reference those
954 * specified in the shared state and release those referencing the old
958 _mesa_update_default_objects_texture(struct gl_context
*ctx
)
962 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
963 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[u
];
964 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
965 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
966 ctx
->Shared
->DefaultTex
[tex
]);