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/bitscan.h"
42 #include "util/bitset.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
;
94 * XXX strictly speaking, we should compare texture names/ids and
95 * bind textures in the dest context according to id. For now, only
96 * copy bindings if the contexts share the same pool of textures to
97 * avoid refcounting bugs.
99 if (dst
->Shared
== src
->Shared
) {
100 /* copy texture object bindings, not contents of texture objects */
101 _mesa_lock_context_textures(dst
);
103 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
104 _mesa_reference_texobj(&dst
->Texture
.Unit
[u
].CurrentTex
[tex
],
105 src
->Texture
.Unit
[u
].CurrentTex
[tex
]);
106 if (src
->Texture
.Unit
[u
].CurrentTex
[tex
]) {
107 dst
->Texture
.NumCurrentTexUsed
=
108 MAX2(dst
->Texture
.NumCurrentTexUsed
, u
+ 1);
111 dst
->Texture
.Unit
[u
]._BoundTextures
= src
->Texture
.Unit
[u
]._BoundTextures
;
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_enum_to_string(texUnit
->EnvMode
));
127 printf(" GL_COMBINE_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.ModeRGB
));
128 printf(" GL_COMBINE_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.ModeA
));
129 printf(" GL_SOURCE0_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceRGB
[0]));
130 printf(" GL_SOURCE1_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceRGB
[1]));
131 printf(" GL_SOURCE2_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceRGB
[2]));
132 printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceA
[0]));
133 printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceA
[1]));
134 printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.SourceA
[2]));
135 printf(" GL_OPERAND0_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandRGB
[0]));
136 printf(" GL_OPERAND1_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandRGB
[1]));
137 printf(" GL_OPERAND2_RGB = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandRGB
[2]));
138 printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandA
[0]));
139 printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_enum_to_string(texUnit
->Combine
.OperandA
[1]));
140 printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_enum_to_string(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
:
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
;
227 mode_rgb
= GL_REPLACE
;
230 state
->SourceRGB
[2] = GL_TEXTURE
;
236 mode_rgb
= GL_INTERPOLATE
;
237 mode_a
= GL_MODULATE
;
239 switch (texBaseFormat
) {
241 mode_rgb
= GL_REPLACE
;
244 mode_a
= GL_INTERPOLATE
;
245 state
->SourceA
[0] = GL_CONSTANT
;
246 state
->OperandA
[2] = GL_SRC_ALPHA
;
252 case GL_LUMINANCE_ALPHA
:
255 state
->SourceRGB
[2] = GL_TEXTURE
;
256 state
->SourceA
[2] = GL_TEXTURE
;
257 state
->SourceRGB
[0] = GL_CONSTANT
;
258 state
->OperandRGB
[2] = GL_SRC_COLOR
;
264 mode_rgb
= (texBaseFormat
== GL_ALPHA
) ? GL_REPLACE
: GL_ADD
;
265 mode_a
= (texBaseFormat
== GL_INTENSITY
) ? GL_ADD
: GL_MODULATE
;
270 "Invalid texture env mode 0x%x in calculate_derived_texenv",
275 state
->ModeRGB
= (state
->SourceRGB
[0] != GL_PREVIOUS
)
276 ? mode_rgb
: GL_REPLACE
;
277 state
->ModeA
= (state
->SourceA
[0] != GL_PREVIOUS
)
278 ? mode_a
: GL_REPLACE
;
282 /* GL_ARB_multitexture */
283 static ALWAYS_INLINE
void
284 active_texture(GLenum texture
, bool no_error
)
286 const GLuint texUnit
= texture
- GL_TEXTURE0
;
288 GET_CURRENT_CONTEXT(ctx
);
290 if (MESA_VERBOSE
& (VERBOSE_API
|VERBOSE_TEXTURE
))
291 _mesa_debug(ctx
, "glActiveTexture %s\n",
292 _mesa_enum_to_string(texture
));
294 if (ctx
->Texture
.CurrentUnit
== texUnit
)
298 GLuint 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
));
309 FLUSH_VERTICES(ctx
, _NEW_TEXTURE_STATE
);
311 ctx
->Texture
.CurrentUnit
= texUnit
;
312 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
313 /* update current stack pointer */
314 ctx
->CurrentStack
= &ctx
->TextureMatrixStack
[texUnit
];
320 _mesa_ActiveTexture_no_error(GLenum texture
)
322 active_texture(texture
, true);
327 _mesa_ActiveTexture(GLenum texture
)
329 active_texture(texture
, false);
333 /* GL_ARB_multitexture */
335 _mesa_ClientActiveTexture(GLenum texture
)
337 GET_CURRENT_CONTEXT(ctx
);
338 GLuint texUnit
= texture
- GL_TEXTURE0
;
340 if (MESA_VERBOSE
& (VERBOSE_API
| VERBOSE_TEXTURE
))
341 _mesa_debug(ctx
, "glClientActiveTexture %s\n",
342 _mesa_enum_to_string(texture
));
344 if (ctx
->Array
.ActiveTexture
== texUnit
)
347 if (texUnit
>= ctx
->Const
.MaxTextureCoordUnits
) {
348 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClientActiveTexture(texture=%s)",
349 _mesa_enum_to_string(texture
));
353 FLUSH_VERTICES(ctx
, _NEW_ARRAY
);
354 ctx
->Array
.ActiveTexture
= texUnit
;
359 /**********************************************************************/
360 /***** State management *****/
361 /**********************************************************************/
365 * \note This routine refers to derived texture attribute values to
366 * compute the ENABLE_TEXMAT flags, but is only called on
367 * _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE_OBJECT/STATE,
368 * the ENABLE_TEXMAT flags are updated by _mesa_update_textures(), below.
370 * \param ctx GL context.
373 _mesa_update_texture_matrices(struct gl_context
*ctx
)
377 ctx
->Texture
._TexMatEnabled
= 0x0;
379 for (u
= 0; u
< ctx
->Const
.MaxTextureCoordUnits
; u
++) {
380 assert(u
< ARRAY_SIZE(ctx
->TextureMatrixStack
));
381 if (_math_matrix_is_dirty(ctx
->TextureMatrixStack
[u
].Top
)) {
382 _math_matrix_analyse( ctx
->TextureMatrixStack
[u
].Top
);
384 if (ctx
->Texture
.Unit
[u
]._Current
&&
385 ctx
->TextureMatrixStack
[u
].Top
->type
!= MATRIX_IDENTITY
)
386 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(u
);
393 * Translate GL combiner state into a MODE_x value
396 tex_combine_translate_mode(GLenum envMode
, GLenum mode
)
399 case GL_REPLACE
: return TEXENV_MODE_REPLACE
;
400 case GL_MODULATE
: return TEXENV_MODE_MODULATE
;
402 if (envMode
== GL_COMBINE4_NV
)
403 return TEXENV_MODE_ADD_PRODUCTS_NV
;
405 return TEXENV_MODE_ADD
;
407 if (envMode
== GL_COMBINE4_NV
)
408 return TEXENV_MODE_ADD_PRODUCTS_SIGNED_NV
;
410 return TEXENV_MODE_ADD_SIGNED
;
411 case GL_INTERPOLATE
: return TEXENV_MODE_INTERPOLATE
;
412 case GL_SUBTRACT
: return TEXENV_MODE_SUBTRACT
;
413 case GL_DOT3_RGB
: return TEXENV_MODE_DOT3_RGB
;
414 case GL_DOT3_RGB_EXT
: return TEXENV_MODE_DOT3_RGB_EXT
;
415 case GL_DOT3_RGBA
: return TEXENV_MODE_DOT3_RGBA
;
416 case GL_DOT3_RGBA_EXT
: return TEXENV_MODE_DOT3_RGBA_EXT
;
417 case GL_MODULATE_ADD_ATI
: return TEXENV_MODE_MODULATE_ADD_ATI
;
418 case GL_MODULATE_SIGNED_ADD_ATI
: return TEXENV_MODE_MODULATE_SIGNED_ADD_ATI
;
419 case GL_MODULATE_SUBTRACT_ATI
: return TEXENV_MODE_MODULATE_SUBTRACT_ATI
;
421 unreachable("Invalid TexEnv Combine mode");
427 tex_combine_translate_source(GLenum src
)
437 case GL_TEXTURE7
: return TEXENV_SRC_TEXTURE0
+ (src
- GL_TEXTURE0
);
438 case GL_TEXTURE
: return TEXENV_SRC_TEXTURE
;
439 case GL_PREVIOUS
: return TEXENV_SRC_PREVIOUS
;
440 case GL_PRIMARY_COLOR
: return TEXENV_SRC_PRIMARY_COLOR
;
441 case GL_CONSTANT
: return TEXENV_SRC_CONSTANT
;
442 case GL_ZERO
: return TEXENV_SRC_ZERO
;
443 case GL_ONE
: return TEXENV_SRC_ONE
;
445 unreachable("Invalid TexEnv Combine argument source");
451 tex_combine_translate_operand(GLenum operand
)
454 case GL_SRC_COLOR
: return TEXENV_OPR_COLOR
;
455 case GL_ONE_MINUS_SRC_COLOR
: return TEXENV_OPR_ONE_MINUS_COLOR
;
456 case GL_SRC_ALPHA
: return TEXENV_OPR_ALPHA
;
457 case GL_ONE_MINUS_SRC_ALPHA
: return TEXENV_OPR_ONE_MINUS_ALPHA
;
459 unreachable("Invalid TexEnv Combine argument source");
465 pack_tex_combine(struct gl_texture_unit
*texUnit
)
467 struct gl_tex_env_combine_state
*state
= texUnit
->_CurrentCombine
;
468 struct gl_tex_env_combine_packed
*packed
= &texUnit
->_CurrentCombinePacked
;
470 memset(packed
, 0, sizeof *packed
);
472 packed
->ModeRGB
= tex_combine_translate_mode(texUnit
->EnvMode
, state
->ModeRGB
);
473 packed
->ModeA
= tex_combine_translate_mode(texUnit
->EnvMode
, state
->ModeA
);
474 packed
->ScaleShiftRGB
= state
->ScaleShiftRGB
;
475 packed
->ScaleShiftA
= state
->ScaleShiftA
;
476 packed
->NumArgsRGB
= state
->_NumArgsRGB
;
477 packed
->NumArgsA
= state
->_NumArgsA
;
479 for (int i
= 0; i
< state
->_NumArgsRGB
; ++i
)
481 packed
->ArgsRGB
[i
].Source
= tex_combine_translate_source(state
->SourceRGB
[i
]);
482 packed
->ArgsRGB
[i
].Operand
= tex_combine_translate_operand(state
->OperandRGB
[i
]);
485 for (int i
= 0; i
< state
->_NumArgsA
; ++i
)
487 packed
->ArgsA
[i
].Source
= tex_combine_translate_source(state
->SourceA
[i
]);
488 packed
->ArgsA
[i
].Operand
= tex_combine_translate_operand(state
->OperandA
[i
]);
494 * Examine texture unit's combine/env state to update derived state.
497 update_tex_combine(struct gl_context
*ctx
, struct gl_texture_unit
*texUnit
)
499 struct gl_tex_env_combine_state
*combine
;
501 /* No combiners will apply to this. */
502 if (texUnit
->_Current
->Target
== GL_TEXTURE_BUFFER
)
505 /* Set the texUnit->_CurrentCombine field to point to the user's combiner
506 * state, or the combiner state which is derived from traditional texenv
509 if (texUnit
->EnvMode
== GL_COMBINE
||
510 texUnit
->EnvMode
== GL_COMBINE4_NV
) {
511 texUnit
->_CurrentCombine
= & texUnit
->Combine
;
514 const struct gl_texture_object
*texObj
= texUnit
->_Current
;
515 GLenum format
= texObj
->Image
[0][texObj
->BaseLevel
]->_BaseFormat
;
517 if (format
== GL_DEPTH_COMPONENT
|| format
== GL_DEPTH_STENCIL_EXT
) {
518 format
= texObj
->DepthMode
;
520 calculate_derived_texenv(&texUnit
->_EnvMode
, texUnit
->EnvMode
, format
);
521 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
524 combine
= texUnit
->_CurrentCombine
;
526 /* Determine number of source RGB terms in the combiner function */
527 switch (combine
->ModeRGB
) {
529 combine
->_NumArgsRGB
= 1;
533 if (texUnit
->EnvMode
== GL_COMBINE4_NV
)
534 combine
->_NumArgsRGB
= 4;
536 combine
->_NumArgsRGB
= 2;
542 case GL_DOT3_RGB_EXT
:
543 case GL_DOT3_RGBA_EXT
:
544 combine
->_NumArgsRGB
= 2;
547 case GL_MODULATE_ADD_ATI
:
548 case GL_MODULATE_SIGNED_ADD_ATI
:
549 case GL_MODULATE_SUBTRACT_ATI
:
550 combine
->_NumArgsRGB
= 3;
553 combine
->_NumArgsRGB
= 0;
554 _mesa_problem(ctx
, "invalid RGB combine mode in update_texture_state");
558 /* Determine number of source Alpha terms in the combiner function */
559 switch (combine
->ModeA
) {
561 combine
->_NumArgsA
= 1;
565 if (texUnit
->EnvMode
== GL_COMBINE4_NV
)
566 combine
->_NumArgsA
= 4;
568 combine
->_NumArgsA
= 2;
572 combine
->_NumArgsA
= 2;
575 case GL_MODULATE_ADD_ATI
:
576 case GL_MODULATE_SIGNED_ADD_ATI
:
577 case GL_MODULATE_SUBTRACT_ATI
:
578 combine
->_NumArgsA
= 3;
581 combine
->_NumArgsA
= 0;
582 _mesa_problem(ctx
, "invalid Alpha combine mode in update_texture_state");
586 pack_tex_combine(texUnit
);
590 update_texgen(struct gl_context
*ctx
)
594 /* Setup texgen for those texture coordinate sets that are in use */
595 for (unit
= 0; unit
< ctx
->Const
.MaxTextureCoordUnits
; unit
++) {
596 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
598 texUnit
->_GenFlags
= 0x0;
600 if (!(ctx
->Texture
._EnabledCoordUnits
& (1 << unit
)))
603 if (texUnit
->TexGenEnabled
) {
604 if (texUnit
->TexGenEnabled
& S_BIT
) {
605 texUnit
->_GenFlags
|= texUnit
->GenS
._ModeBit
;
607 if (texUnit
->TexGenEnabled
& T_BIT
) {
608 texUnit
->_GenFlags
|= texUnit
->GenT
._ModeBit
;
610 if (texUnit
->TexGenEnabled
& R_BIT
) {
611 texUnit
->_GenFlags
|= texUnit
->GenR
._ModeBit
;
613 if (texUnit
->TexGenEnabled
& Q_BIT
) {
614 texUnit
->_GenFlags
|= texUnit
->GenQ
._ModeBit
;
617 ctx
->Texture
._TexGenEnabled
|= ENABLE_TEXGEN(unit
);
618 ctx
->Texture
._GenFlags
|= texUnit
->_GenFlags
;
621 assert(unit
< ARRAY_SIZE(ctx
->TextureMatrixStack
));
622 if (ctx
->TextureMatrixStack
[unit
].Top
->type
!= MATRIX_IDENTITY
)
623 ctx
->Texture
._TexMatEnabled
|= ENABLE_TEXMAT(unit
);
627 static struct gl_texture_object
*
628 update_single_program_texture(struct gl_context
*ctx
, struct gl_program
*prog
,
631 gl_texture_index target_index
;
632 struct gl_texture_unit
*texUnit
;
633 struct gl_texture_object
*texObj
;
634 struct gl_sampler_object
*sampler
;
637 unit
= prog
->SamplerUnits
[s
];
638 texUnit
= &ctx
->Texture
.Unit
[unit
];
640 /* Note: If more than one bit was set in TexturesUsed[unit], then we should
641 * have had the draw call rejected already. From the GL 4.4 specification,
642 * section 7.10 ("Samplers"):
644 * "It is not allowed to have variables of different sampler types
645 * pointing to the same texture image unit within a program
646 * object. This situation can only be detected at the next rendering
647 * command issued which triggers shader invocations, and an
648 * INVALID_OPERATION error will then be generated."
650 target_index
= ffs(prog
->TexturesUsed
[unit
]) - 1;
651 texObj
= texUnit
->CurrentTex
[target_index
];
653 sampler
= texUnit
->Sampler
?
654 texUnit
->Sampler
: &texObj
->Sampler
;
656 if (likely(texObj
)) {
657 if (_mesa_is_texture_complete(texObj
, sampler
))
660 _mesa_test_texobj_completeness(ctx
, texObj
);
661 if (_mesa_is_texture_complete(texObj
, sampler
))
665 /* If we've reached this point, we didn't find a complete texture of the
666 * shader's target. From the GL 4.4 core specification, section 11.1.3.5
667 * ("Texture Access"):
669 * "If a sampler is used in a shader and the sampler’s associated
670 * texture is not complete, as defined in section 8.17, (0, 0, 0, 1)
671 * will be returned for a non-shadow sampler and 0 for a shadow
674 * Mesa implements this by creating a hidden texture object with a pixel of
677 texObj
= _mesa_get_fallback_texture(ctx
, target_index
);
684 update_program_texture_state(struct gl_context
*ctx
, struct gl_program
**prog
,
685 BITSET_WORD
*enabled_texture_units
)
689 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
695 mask
= prog
[i
]->SamplersUsed
;
698 const int s
= u_bit_scan(&mask
);
699 struct gl_texture_object
*texObj
;
701 texObj
= update_single_program_texture(ctx
, prog
[i
], s
);
703 int unit
= prog
[i
]->SamplerUnits
[s
];
704 _mesa_reference_texobj(&ctx
->Texture
.Unit
[unit
]._Current
, texObj
);
705 BITSET_SET(enabled_texture_units
, unit
);
706 ctx
->Texture
._MaxEnabledTexImageUnit
=
707 MAX2(ctx
->Texture
._MaxEnabledTexImageUnit
, (int)unit
);
712 if (prog
[MESA_SHADER_FRAGMENT
]) {
713 const GLuint coordMask
= (1 << MAX_TEXTURE_COORD_UNITS
) - 1;
714 ctx
->Texture
._EnabledCoordUnits
|=
715 (prog
[MESA_SHADER_FRAGMENT
]->info
.inputs_read
>> VARYING_SLOT_TEX0
) &
721 update_ff_texture_state(struct gl_context
*ctx
,
722 BITSET_WORD
*enabled_texture_units
)
726 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
727 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
731 if (texUnit
->Enabled
== 0x0)
734 /* If a shader already dictated what texture target was used for this
735 * unit, just go along with it.
737 if (BITSET_TEST(enabled_texture_units
, unit
))
740 /* From the GL 4.4 compat specification, section 16.2 ("Texture Application"):
742 * "Texturing is enabled or disabled using the generic Enable and
743 * Disable commands, respectively, with the symbolic constants
744 * TEXTURE_1D, TEXTURE_2D, TEXTURE_RECTANGLE, TEXTURE_3D, or
745 * TEXTURE_CUBE_MAP to enable the one-, two-, rectangular,
746 * three-dimensional, or cube map texture, respectively. If more
747 * than one of these textures is enabled, the first one enabled
748 * from the following list is used:
750 * • cube map texture
751 * • three-dimensional texture
752 * • rectangular texture
753 * • two-dimensional texture
754 * • one-dimensional texture"
756 * Note that the TEXTURE_x_INDEX values are in high to low priority.
759 * "If a texture unit is disabled or has an invalid or incomplete
760 * texture (as defined in section 8.17) bound to it, then blending
761 * is disabled for that texture unit. If the texture environment
762 * for a given enabled texture unit references a disabled texture
763 * unit, or an invalid or incomplete texture that is bound to
764 * another unit, then the results of texture blending are
768 mask
= texUnit
->Enabled
;
770 const int texIndex
= u_bit_scan(&mask
);
771 struct gl_texture_object
*texObj
= texUnit
->CurrentTex
[texIndex
];
772 struct gl_sampler_object
*sampler
= texUnit
->Sampler
?
773 texUnit
->Sampler
: &texObj
->Sampler
;
775 if (!_mesa_is_texture_complete(texObj
, sampler
)) {
776 _mesa_test_texobj_completeness(ctx
, texObj
);
778 if (_mesa_is_texture_complete(texObj
, sampler
)) {
779 _mesa_reference_texobj(&texUnit
->_Current
, texObj
);
788 /* if we get here, we know this texture unit is enabled */
789 BITSET_SET(enabled_texture_units
, unit
);
790 ctx
->Texture
._MaxEnabledTexImageUnit
=
791 MAX2(ctx
->Texture
._MaxEnabledTexImageUnit
, (int)unit
);
793 ctx
->Texture
._EnabledCoordUnits
|= 1 << unit
;
795 update_tex_combine(ctx
, texUnit
);
800 * \note This routine refers to derived texture matrix values to
801 * compute the ENABLE_TEXMAT flags, but is only called on
802 * _NEW_TEXTURE_OBJECT/STATE. On changes to _NEW_TEXTURE_MATRIX,
803 * the ENABLE_TEXMAT flags are updated by _mesa_update_texture_matrices,
806 * \param ctx GL context.
809 _mesa_update_texture_state(struct gl_context
*ctx
)
811 struct gl_program
*prog
[MESA_SHADER_STAGES
];
813 int old_max_unit
= ctx
->Texture
._MaxEnabledTexImageUnit
;
814 BITSET_DECLARE(enabled_texture_units
, MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
816 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
817 if (ctx
->_Shader
->CurrentProgram
[i
]) {
818 prog
[i
] = ctx
->_Shader
->CurrentProgram
[i
];
824 if (prog
[MESA_SHADER_FRAGMENT
] == NULL
&& ctx
->FragmentProgram
._Enabled
) {
825 prog
[MESA_SHADER_FRAGMENT
] = ctx
->FragmentProgram
.Current
;
828 /* TODO: only set this if there are actual changes */
829 ctx
->NewState
|= _NEW_TEXTURE_OBJECT
| _NEW_TEXTURE_STATE
;
831 ctx
->Texture
._GenFlags
= 0x0;
832 ctx
->Texture
._TexMatEnabled
= 0x0;
833 ctx
->Texture
._TexGenEnabled
= 0x0;
834 ctx
->Texture
._MaxEnabledTexImageUnit
= -1;
835 ctx
->Texture
._EnabledCoordUnits
= 0x0;
837 memset(&enabled_texture_units
, 0, sizeof(enabled_texture_units
));
839 /* First, walk over our programs pulling in all the textures for them.
840 * Programs dictate specific texture targets to be enabled, and for a draw
841 * call to be valid they can't conflict about which texture targets are
844 update_program_texture_state(ctx
, prog
, enabled_texture_units
);
846 /* Also pull in any textures necessary for fixed function fragment shading.
848 if (!prog
[MESA_SHADER_FRAGMENT
])
849 update_ff_texture_state(ctx
, enabled_texture_units
);
851 /* Now, clear out the _Current of any disabled texture units. */
852 for (i
= 0; i
<= ctx
->Texture
._MaxEnabledTexImageUnit
; i
++) {
853 if (!BITSET_TEST(enabled_texture_units
, i
))
854 _mesa_reference_texobj(&ctx
->Texture
.Unit
[i
]._Current
, NULL
);
856 for (i
= ctx
->Texture
._MaxEnabledTexImageUnit
+ 1; i
<= old_max_unit
; i
++) {
857 _mesa_reference_texobj(&ctx
->Texture
.Unit
[i
]._Current
, NULL
);
860 if (!prog
[MESA_SHADER_FRAGMENT
] || !prog
[MESA_SHADER_VERTEX
])
865 /**********************************************************************/
866 /***** Initialization *****/
867 /**********************************************************************/
870 * Allocate the proxy textures for the given context.
872 * \param ctx the context to allocate proxies for.
874 * \return GL_TRUE on success, or GL_FALSE on failure
876 * If run out of memory part way through the allocations, clean up and return
880 alloc_proxy_textures( struct gl_context
*ctx
)
882 /* NOTE: these values must be in the same order as the TEXTURE_x_INDEX
885 static const GLenum targets
[] = {
886 GL_TEXTURE_2D_MULTISAMPLE
,
887 GL_TEXTURE_2D_MULTISAMPLE_ARRAY
,
888 GL_TEXTURE_CUBE_MAP_ARRAY
,
890 GL_TEXTURE_2D_ARRAY_EXT
,
891 GL_TEXTURE_1D_ARRAY_EXT
,
892 GL_TEXTURE_EXTERNAL_OES
,
895 GL_TEXTURE_RECTANGLE_NV
,
901 STATIC_ASSERT(ARRAY_SIZE(targets
) == NUM_TEXTURE_TARGETS
);
902 assert(targets
[TEXTURE_2D_INDEX
] == GL_TEXTURE_2D
);
903 assert(targets
[TEXTURE_CUBE_INDEX
] == GL_TEXTURE_CUBE_MAP
);
905 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
906 if (!(ctx
->Texture
.ProxyTex
[tgt
]
907 = ctx
->Driver
.NewTextureObject(ctx
, 0, targets
[tgt
]))) {
908 /* out of memory, free what we did allocate */
910 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
916 assert(ctx
->Texture
.ProxyTex
[0]->RefCount
== 1); /* sanity check */
922 * Initialize a texture unit.
924 * \param ctx GL context.
925 * \param unit texture unit number to be initialized.
928 init_texture_unit( struct gl_context
*ctx
, GLuint unit
)
930 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
933 texUnit
->EnvMode
= GL_MODULATE
;
934 ASSIGN_4V( texUnit
->EnvColor
, 0.0, 0.0, 0.0, 0.0 );
936 texUnit
->Combine
= default_combine_state
;
937 texUnit
->_EnvMode
= default_combine_state
;
938 texUnit
->_CurrentCombine
= & texUnit
->_EnvMode
;
940 texUnit
->TexGenEnabled
= 0x0;
941 texUnit
->GenS
.Mode
= GL_EYE_LINEAR
;
942 texUnit
->GenT
.Mode
= GL_EYE_LINEAR
;
943 texUnit
->GenR
.Mode
= GL_EYE_LINEAR
;
944 texUnit
->GenQ
.Mode
= GL_EYE_LINEAR
;
945 texUnit
->GenS
._ModeBit
= TEXGEN_EYE_LINEAR
;
946 texUnit
->GenT
._ModeBit
= TEXGEN_EYE_LINEAR
;
947 texUnit
->GenR
._ModeBit
= TEXGEN_EYE_LINEAR
;
948 texUnit
->GenQ
._ModeBit
= TEXGEN_EYE_LINEAR
;
950 /* Yes, these plane coefficients are correct! */
951 ASSIGN_4V( texUnit
->GenS
.ObjectPlane
, 1.0, 0.0, 0.0, 0.0 );
952 ASSIGN_4V( texUnit
->GenT
.ObjectPlane
, 0.0, 1.0, 0.0, 0.0 );
953 ASSIGN_4V( texUnit
->GenR
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
954 ASSIGN_4V( texUnit
->GenQ
.ObjectPlane
, 0.0, 0.0, 0.0, 0.0 );
955 ASSIGN_4V( texUnit
->GenS
.EyePlane
, 1.0, 0.0, 0.0, 0.0 );
956 ASSIGN_4V( texUnit
->GenT
.EyePlane
, 0.0, 1.0, 0.0, 0.0 );
957 ASSIGN_4V( texUnit
->GenR
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
958 ASSIGN_4V( texUnit
->GenQ
.EyePlane
, 0.0, 0.0, 0.0, 0.0 );
960 /* initialize current texture object ptrs to the shared default objects */
961 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
962 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
963 ctx
->Shared
->DefaultTex
[tex
]);
966 texUnit
->_BoundTextures
= 0;
971 * Initialize texture state for the given context.
974 _mesa_init_texture(struct gl_context
*ctx
)
979 ctx
->Texture
.CurrentUnit
= 0; /* multitexture */
981 /* Appendix F.2 of the OpenGL ES 3.0 spec says:
983 * "OpenGL ES 3.0 requires that all cube map filtering be
984 * seamless. OpenGL ES 2.0 specified that a single cube map face be
985 * selected and used for filtering."
987 * Unfortunatley, a call to _mesa_is_gles3 below will only work if
988 * the driver has already computed and set ctx->Version, however drivers
989 * seem to call _mesa_initialize_context (which calls this) early
990 * in the CreateContext hook and _mesa_compute_version much later (since
991 * it needs information about available extensions). So, we will
992 * enable seamless cubemaps by default since GLES2. This should work
993 * for most implementations and drivers that don't support seamless
994 * cubemaps for GLES2 can still disable it.
996 ctx
->Texture
.CubeMapSeamless
= ctx
->API
== API_OPENGLES2
;
998 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++)
999 init_texture_unit(ctx
, u
);
1001 /* After we're done initializing the context's texture state the default
1002 * texture objects' refcounts should be at least
1003 * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
1005 assert(ctx
->Shared
->DefaultTex
[TEXTURE_1D_INDEX
]->RefCount
1006 >= MAX_COMBINED_TEXTURE_IMAGE_UNITS
+ 1);
1008 /* Allocate proxy textures */
1009 if (!alloc_proxy_textures( ctx
))
1012 /* GL_ARB_texture_buffer_object */
1013 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
,
1014 ctx
->Shared
->NullBufferObj
);
1016 ctx
->Texture
.NumCurrentTexUsed
= 0;
1023 * Free dynamically-allocted texture data attached to the given context.
1026 _mesa_free_texture_data(struct gl_context
*ctx
)
1030 /* unreference current textures */
1031 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
1032 /* The _Current texture could account for another reference */
1033 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
]._Current
, NULL
);
1035 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++) {
1036 _mesa_reference_texobj(&ctx
->Texture
.Unit
[u
].CurrentTex
[tgt
], NULL
);
1040 /* Free proxy texture objects */
1041 for (tgt
= 0; tgt
< NUM_TEXTURE_TARGETS
; tgt
++)
1042 ctx
->Driver
.DeleteTexture(ctx
, ctx
->Texture
.ProxyTex
[tgt
]);
1044 /* GL_ARB_texture_buffer_object */
1045 _mesa_reference_buffer_object(ctx
, &ctx
->Texture
.BufferObject
, NULL
);
1047 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
1048 _mesa_reference_sampler_object(ctx
, &ctx
->Texture
.Unit
[u
].Sampler
, NULL
);
1054 * Update the default texture objects in the given context to reference those
1055 * specified in the shared state and release those referencing the old
1059 _mesa_update_default_objects_texture(struct gl_context
*ctx
)
1063 for (u
= 0; u
< ARRAY_SIZE(ctx
->Texture
.Unit
); u
++) {
1064 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[u
];
1065 for (tex
= 0; tex
< NUM_TEXTURE_TARGETS
; tex
++) {
1066 _mesa_reference_texobj(&texUnit
->CurrentTex
[tex
],
1067 ctx
->Shared
->DefaultTex
[tex
]);