2 * Copyright © 2009 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 #include "main/core.h" /* for Elements */
27 #include "glsl_symbol_table.h"
28 #include "glsl_parser_extras.h"
29 #include "glsl_types.h"
31 #include "program/hash_table.h"
34 hash_table
*glsl_type::array_types
= NULL
;
35 hash_table
*glsl_type::record_types
= NULL
;
36 hash_table
*glsl_type::interface_types
= NULL
;
37 void *glsl_type::mem_ctx
= NULL
;
40 glsl_type::init_ralloc_type_ctx(void)
42 if (glsl_type::mem_ctx
== NULL
) {
43 glsl_type::mem_ctx
= ralloc_autofree_context();
44 assert(glsl_type::mem_ctx
!= NULL
);
48 glsl_type::glsl_type(GLenum gl_type
,
49 glsl_base_type base_type
, unsigned vector_elements
,
50 unsigned matrix_columns
, const char *name
) :
53 sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
54 sampler_type(0), interface_packing(0),
55 vector_elements(vector_elements
), matrix_columns(matrix_columns
),
58 init_ralloc_type_ctx();
60 this->name
= ralloc_strdup(this->mem_ctx
, name
);
61 /* Neither dimension is zero or both dimensions are zero.
63 assert((vector_elements
== 0) == (matrix_columns
== 0));
64 memset(& fields
, 0, sizeof(fields
));
67 glsl_type::glsl_type(GLenum gl_type
,
68 enum glsl_sampler_dim dim
, bool shadow
, bool array
,
69 unsigned type
, const char *name
) :
71 base_type(GLSL_TYPE_SAMPLER
),
72 sampler_dimensionality(dim
), sampler_shadow(shadow
),
73 sampler_array(array
), sampler_type(type
), interface_packing(0),
74 vector_elements(0), matrix_columns(0),
77 init_ralloc_type_ctx();
79 this->name
= ralloc_strdup(this->mem_ctx
, name
);
80 memset(& fields
, 0, sizeof(fields
));
83 glsl_type::glsl_type(const glsl_struct_field
*fields
, unsigned num_fields
,
86 base_type(GLSL_TYPE_STRUCT
),
87 sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
88 sampler_type(0), interface_packing(0),
89 vector_elements(0), matrix_columns(0),
94 init_ralloc_type_ctx();
96 this->name
= ralloc_strdup(this->mem_ctx
, name
);
97 this->fields
.structure
= ralloc_array(this->mem_ctx
,
98 glsl_struct_field
, length
);
99 for (i
= 0; i
< length
; i
++) {
100 this->fields
.structure
[i
].type
= fields
[i
].type
;
101 this->fields
.structure
[i
].name
= ralloc_strdup(this->fields
.structure
,
103 this->fields
.structure
[i
].row_major
= fields
[i
].row_major
;
107 glsl_type::glsl_type(const glsl_struct_field
*fields
, unsigned num_fields
,
108 enum glsl_interface_packing packing
, const char *name
) :
110 base_type(GLSL_TYPE_INTERFACE
),
111 sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
112 sampler_type(0), interface_packing((unsigned) packing
),
113 vector_elements(0), matrix_columns(0),
118 init_ralloc_type_ctx();
119 assert(name
!= NULL
);
120 this->name
= ralloc_strdup(this->mem_ctx
, name
);
121 this->fields
.structure
= ralloc_array(this->mem_ctx
,
122 glsl_struct_field
, length
);
123 for (i
= 0; i
< length
; i
++) {
124 this->fields
.structure
[i
].type
= fields
[i
].type
;
125 this->fields
.structure
[i
].name
= ralloc_strdup(this->fields
.structure
,
127 this->fields
.structure
[i
].row_major
= fields
[i
].row_major
;
133 glsl_type::contains_sampler() const
135 if (this->is_array()) {
136 return this->fields
.array
->contains_sampler();
137 } else if (this->is_record()) {
138 for (unsigned int i
= 0; i
< this->length
; i
++) {
139 if (this->fields
.structure
[i
].type
->contains_sampler())
144 return this->is_sampler();
150 glsl_type::contains_integer() const
152 if (this->is_array()) {
153 return this->fields
.array
->contains_integer();
154 } else if (this->is_record()) {
155 for (unsigned int i
= 0; i
< this->length
; i
++) {
156 if (this->fields
.structure
[i
].type
->contains_integer())
161 return this->is_integer();
167 glsl_type::sampler_index() const
169 const glsl_type
*const t
= (this->is_array()) ? this->fields
.array
: this;
171 assert(t
->is_sampler());
173 switch (t
->sampler_dimensionality
) {
174 case GLSL_SAMPLER_DIM_1D
:
175 return (t
->sampler_array
) ? TEXTURE_1D_ARRAY_INDEX
: TEXTURE_1D_INDEX
;
176 case GLSL_SAMPLER_DIM_2D
:
177 return (t
->sampler_array
) ? TEXTURE_2D_ARRAY_INDEX
: TEXTURE_2D_INDEX
;
178 case GLSL_SAMPLER_DIM_3D
:
179 return TEXTURE_3D_INDEX
;
180 case GLSL_SAMPLER_DIM_CUBE
:
181 return (t
->sampler_array
) ? TEXTURE_CUBE_ARRAY_INDEX
: TEXTURE_CUBE_INDEX
;
182 case GLSL_SAMPLER_DIM_RECT
:
183 return TEXTURE_RECT_INDEX
;
184 case GLSL_SAMPLER_DIM_BUF
:
185 return TEXTURE_BUFFER_INDEX
;
186 case GLSL_SAMPLER_DIM_EXTERNAL
:
187 return TEXTURE_EXTERNAL_INDEX
;
188 case GLSL_SAMPLER_DIM_MS
:
189 return (t
->sampler_array
) ? TEXTURE_2D_MULTISAMPLE_ARRAY_INDEX
: TEXTURE_2D_MULTISAMPLE_INDEX
;
191 assert(!"Should not get here.");
192 return TEXTURE_BUFFER_INDEX
;
197 const glsl_type
*glsl_type::get_base_type() const
204 case GLSL_TYPE_FLOAT
:
214 const glsl_type
*glsl_type::get_scalar_type() const
216 const glsl_type
*type
= this;
219 while (type
->base_type
== GLSL_TYPE_ARRAY
)
220 type
= type
->fields
.array
;
222 /* Handle vectors and matrices */
223 switch (type
->base_type
) {
228 case GLSL_TYPE_FLOAT
:
233 /* Handle everything else */
240 _mesa_glsl_release_types(void)
242 if (glsl_type::array_types
!= NULL
) {
243 hash_table_dtor(glsl_type::array_types
);
244 glsl_type::array_types
= NULL
;
247 if (glsl_type::record_types
!= NULL
) {
248 hash_table_dtor(glsl_type::record_types
);
249 glsl_type::record_types
= NULL
;
254 glsl_type::glsl_type(const glsl_type
*array
, unsigned length
) :
255 base_type(GLSL_TYPE_ARRAY
),
256 sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
257 sampler_type(0), interface_packing(0),
258 vector_elements(0), matrix_columns(0),
259 name(NULL
), length(length
)
261 this->fields
.array
= array
;
262 /* Inherit the gl type of the base. The GL type is used for
263 * uniform/statevar handling in Mesa and the arrayness of the type
264 * is represented by the size rather than the type.
266 this->gl_type
= array
->gl_type
;
268 /* Allow a maximum of 10 characters for the array size. This is enough
269 * for 32-bits of ~0. The extra 3 are for the '[', ']', and terminating
272 const unsigned name_length
= strlen(array
->name
) + 10 + 3;
273 char *const n
= (char *) ralloc_size(this->mem_ctx
, name_length
);
276 snprintf(n
, name_length
, "%s[]", array
->name
);
278 snprintf(n
, name_length
, "%s[%u]", array
->name
, length
);
285 glsl_type::vec(unsigned components
)
287 if (components
== 0 || components
> 4)
290 static const glsl_type
*const ts
[] = {
291 float_type
, vec2_type
, vec3_type
, vec4_type
293 return ts
[components
- 1];
298 glsl_type::ivec(unsigned components
)
300 if (components
== 0 || components
> 4)
303 static const glsl_type
*const ts
[] = {
304 int_type
, ivec2_type
, ivec3_type
, ivec4_type
306 return ts
[components
- 1];
311 glsl_type::uvec(unsigned components
)
313 if (components
== 0 || components
> 4)
316 static const glsl_type
*const ts
[] = {
317 uint_type
, uvec2_type
, uvec3_type
, uvec4_type
319 return ts
[components
- 1];
324 glsl_type::bvec(unsigned components
)
326 if (components
== 0 || components
> 4)
329 static const glsl_type
*const ts
[] = {
330 bool_type
, bvec2_type
, bvec3_type
, bvec4_type
332 return ts
[components
- 1];
337 glsl_type::get_instance(unsigned base_type
, unsigned rows
, unsigned columns
)
339 if (base_type
== GLSL_TYPE_VOID
)
342 if ((rows
< 1) || (rows
> 4) || (columns
< 1) || (columns
> 4))
345 /* Treat GLSL vectors as Nx1 matrices.
353 case GLSL_TYPE_FLOAT
:
361 if ((base_type
!= GLSL_TYPE_FLOAT
) || (rows
== 1))
364 /* GLSL matrix types are named mat{COLUMNS}x{ROWS}. Only the following
365 * combinations are valid:
373 #define IDX(c,r) (((c-1)*3) + (r-1))
375 switch (IDX(columns
, rows
)) {
376 case IDX(2,2): return mat2_type
;
377 case IDX(2,3): return mat2x3_type
;
378 case IDX(2,4): return mat2x4_type
;
379 case IDX(3,2): return mat3x2_type
;
380 case IDX(3,3): return mat3_type
;
381 case IDX(3,4): return mat3x4_type
;
382 case IDX(4,2): return mat4x2_type
;
383 case IDX(4,3): return mat4x3_type
;
384 case IDX(4,4): return mat4_type
;
385 default: return error_type
;
389 assert(!"Should not get here.");
395 glsl_type::get_array_instance(const glsl_type
*base
, unsigned array_size
)
398 if (array_types
== NULL
) {
399 array_types
= hash_table_ctor(64, hash_table_string_hash
,
400 hash_table_string_compare
);
403 /* Generate a name using the base type pointer in the key. This is
404 * done because the name of the base type may not be unique across
405 * shaders. For example, two shaders may have different record types
409 snprintf(key
, sizeof(key
), "%p[%u]", (void *) base
, array_size
);
411 const glsl_type
*t
= (glsl_type
*) hash_table_find(array_types
, key
);
413 t
= new glsl_type(base
, array_size
);
415 hash_table_insert(array_types
, (void *) t
, ralloc_strdup(mem_ctx
, key
));
418 assert(t
->base_type
== GLSL_TYPE_ARRAY
);
419 assert(t
->length
== array_size
);
420 assert(t
->fields
.array
== base
);
427 glsl_type::record_key_compare(const void *a
, const void *b
)
429 const glsl_type
*const key1
= (glsl_type
*) a
;
430 const glsl_type
*const key2
= (glsl_type
*) b
;
432 /* Return zero is the types match (there is zero difference) or non-zero
435 if (strcmp(key1
->name
, key2
->name
) != 0)
438 if (key1
->length
!= key2
->length
)
441 if (key1
->interface_packing
!= key2
->interface_packing
)
444 for (unsigned i
= 0; i
< key1
->length
; i
++) {
445 if (key1
->fields
.structure
[i
].type
!= key2
->fields
.structure
[i
].type
)
447 if (strcmp(key1
->fields
.structure
[i
].name
,
448 key2
->fields
.structure
[i
].name
) != 0)
450 if (key1
->fields
.structure
[i
].row_major
451 != key2
->fields
.structure
[i
].row_major
)
460 glsl_type::record_key_hash(const void *a
)
462 const glsl_type
*const key
= (glsl_type
*) a
;
466 size
= snprintf(hash_key
, sizeof(hash_key
), "%08x", key
->length
);
468 for (unsigned i
= 0; i
< key
->length
; i
++) {
469 if (size
>= sizeof(hash_key
))
472 size
+= snprintf(& hash_key
[size
], sizeof(hash_key
) - size
,
473 "%p", (void *) key
->fields
.structure
[i
].type
);
476 return hash_table_string_hash(& hash_key
);
481 glsl_type::get_record_instance(const glsl_struct_field
*fields
,
485 const glsl_type
key(fields
, num_fields
, name
);
487 if (record_types
== NULL
) {
488 record_types
= hash_table_ctor(64, record_key_hash
, record_key_compare
);
491 const glsl_type
*t
= (glsl_type
*) hash_table_find(record_types
, & key
);
493 t
= new glsl_type(fields
, num_fields
, name
);
495 hash_table_insert(record_types
, (void *) t
, t
);
498 assert(t
->base_type
== GLSL_TYPE_STRUCT
);
499 assert(t
->length
== num_fields
);
500 assert(strcmp(t
->name
, name
) == 0);
507 glsl_type::get_interface_instance(const glsl_struct_field
*fields
,
509 enum glsl_interface_packing packing
,
512 const glsl_type
key(fields
, num_fields
, packing
, name
);
514 if (interface_types
== NULL
) {
515 interface_types
= hash_table_ctor(64, record_key_hash
, record_key_compare
);
518 const glsl_type
*t
= (glsl_type
*) hash_table_find(interface_types
, & key
);
520 t
= new glsl_type(fields
, num_fields
, packing
, name
);
522 hash_table_insert(interface_types
, (void *) t
, t
);
525 assert(t
->base_type
== GLSL_TYPE_INTERFACE
);
526 assert(t
->length
== num_fields
);
527 assert(strcmp(t
->name
, name
) == 0);
534 glsl_type::field_type(const char *name
) const
536 if (this->base_type
!= GLSL_TYPE_STRUCT
537 && this->base_type
!= GLSL_TYPE_INTERFACE
)
540 for (unsigned i
= 0; i
< this->length
; i
++) {
541 if (strcmp(name
, this->fields
.structure
[i
].name
) == 0)
542 return this->fields
.structure
[i
].type
;
550 glsl_type::field_index(const char *name
) const
552 if (this->base_type
!= GLSL_TYPE_STRUCT
553 && this->base_type
!= GLSL_TYPE_INTERFACE
)
556 for (unsigned i
= 0; i
< this->length
; i
++) {
557 if (strcmp(name
, this->fields
.structure
[i
].name
) == 0)
566 glsl_type::component_slots() const
568 switch (this->base_type
) {
571 case GLSL_TYPE_FLOAT
:
573 return this->components();
575 case GLSL_TYPE_STRUCT
:
576 case GLSL_TYPE_INTERFACE
: {
579 for (unsigned i
= 0; i
< this->length
; i
++)
580 size
+= this->fields
.structure
[i
].type
->component_slots();
585 case GLSL_TYPE_ARRAY
:
586 return this->length
* this->fields
.array
->component_slots();
588 case GLSL_TYPE_SAMPLER
:
590 case GLSL_TYPE_ERROR
:
598 glsl_type::can_implicitly_convert_to(const glsl_type
*desired
) const
603 /* There is no conversion among matrix types. */
604 if (this->matrix_columns
> 1 || desired
->matrix_columns
> 1)
607 /* int and uint can be converted to float. */
608 return desired
->is_float()
609 && this->is_integer()
610 && this->vector_elements
== desired
->vector_elements
;
614 glsl_type::std140_base_alignment(bool row_major
) const
616 /* (1) If the member is a scalar consuming <N> basic machine units, the
617 * base alignment is <N>.
619 * (2) If the member is a two- or four-component vector with components
620 * consuming <N> basic machine units, the base alignment is 2<N> or
621 * 4<N>, respectively.
623 * (3) If the member is a three-component vector with components consuming
624 * <N> basic machine units, the base alignment is 4<N>.
626 if (this->is_scalar() || this->is_vector()) {
627 switch (this->vector_elements
) {
638 /* (4) If the member is an array of scalars or vectors, the base alignment
639 * and array stride are set to match the base alignment of a single
640 * array element, according to rules (1), (2), and (3), and rounded up
641 * to the base alignment of a vec4. The array may have padding at the
642 * end; the base offset of the member following the array is rounded up
643 * to the next multiple of the base alignment.
645 * (6) If the member is an array of <S> column-major matrices with <C>
646 * columns and <R> rows, the matrix is stored identically to a row of
647 * <S>*<C> column vectors with <R> components each, according to rule
650 * (8) If the member is an array of <S> row-major matrices with <C> columns
651 * and <R> rows, the matrix is stored identically to a row of <S>*<R>
652 * row vectors with <C> components each, according to rule (4).
654 * (10) If the member is an array of <S> structures, the <S> elements of
655 * the array are laid out in order, according to rule (9).
657 if (this->is_array()) {
658 if (this->fields
.array
->is_scalar() ||
659 this->fields
.array
->is_vector() ||
660 this->fields
.array
->is_matrix()) {
661 return MAX2(this->fields
.array
->std140_base_alignment(row_major
), 16);
663 assert(this->fields
.array
->is_record());
664 return this->fields
.array
->std140_base_alignment(row_major
);
668 /* (5) If the member is a column-major matrix with <C> columns and
669 * <R> rows, the matrix is stored identically to an array of
670 * <C> column vectors with <R> components each, according to
673 * (7) If the member is a row-major matrix with <C> columns and <R>
674 * rows, the matrix is stored identically to an array of <R>
675 * row vectors with <C> components each, according to rule (4).
677 if (this->is_matrix()) {
678 const struct glsl_type
*vec_type
, *array_type
;
679 int c
= this->matrix_columns
;
680 int r
= this->vector_elements
;
683 vec_type
= get_instance(GLSL_TYPE_FLOAT
, c
, 1);
684 array_type
= glsl_type::get_array_instance(vec_type
, r
);
686 vec_type
= get_instance(GLSL_TYPE_FLOAT
, r
, 1);
687 array_type
= glsl_type::get_array_instance(vec_type
, c
);
690 return array_type
->std140_base_alignment(false);
693 /* (9) If the member is a structure, the base alignment of the
694 * structure is <N>, where <N> is the largest base alignment
695 * value of any of its members, and rounded up to the base
696 * alignment of a vec4. The individual members of this
697 * sub-structure are then assigned offsets by applying this set
698 * of rules recursively, where the base offset of the first
699 * member of the sub-structure is equal to the aligned offset
700 * of the structure. The structure may have padding at the end;
701 * the base offset of the member following the sub-structure is
702 * rounded up to the next multiple of the base alignment of the
705 if (this->is_record()) {
706 unsigned base_alignment
= 16;
707 for (unsigned i
= 0; i
< this->length
; i
++) {
708 const struct glsl_type
*field_type
= this->fields
.structure
[i
].type
;
709 base_alignment
= MAX2(base_alignment
,
710 field_type
->std140_base_alignment(row_major
));
712 return base_alignment
;
715 assert(!"not reached");
720 glsl_type::std140_size(bool row_major
) const
722 /* (1) If the member is a scalar consuming <N> basic machine units, the
723 * base alignment is <N>.
725 * (2) If the member is a two- or four-component vector with components
726 * consuming <N> basic machine units, the base alignment is 2<N> or
727 * 4<N>, respectively.
729 * (3) If the member is a three-component vector with components consuming
730 * <N> basic machine units, the base alignment is 4<N>.
732 if (this->is_scalar() || this->is_vector()) {
733 return this->vector_elements
* 4;
736 /* (5) If the member is a column-major matrix with <C> columns and
737 * <R> rows, the matrix is stored identically to an array of
738 * <C> column vectors with <R> components each, according to
741 * (6) If the member is an array of <S> column-major matrices with <C>
742 * columns and <R> rows, the matrix is stored identically to a row of
743 * <S>*<C> column vectors with <R> components each, according to rule
746 * (7) If the member is a row-major matrix with <C> columns and <R>
747 * rows, the matrix is stored identically to an array of <R>
748 * row vectors with <C> components each, according to rule (4).
750 * (8) If the member is an array of <S> row-major matrices with <C> columns
751 * and <R> rows, the matrix is stored identically to a row of <S>*<R>
752 * row vectors with <C> components each, according to rule (4).
754 if (this->is_matrix() || (this->is_array() &&
755 this->fields
.array
->is_matrix())) {
756 const struct glsl_type
*element_type
;
757 const struct glsl_type
*vec_type
;
758 unsigned int array_len
;
760 if (this->is_array()) {
761 element_type
= this->fields
.array
;
762 array_len
= this->length
;
769 vec_type
= get_instance(GLSL_TYPE_FLOAT
,
770 element_type
->matrix_columns
, 1);
771 array_len
*= element_type
->vector_elements
;
773 vec_type
= get_instance(GLSL_TYPE_FLOAT
,
774 element_type
->vector_elements
, 1);
775 array_len
*= element_type
->matrix_columns
;
777 const glsl_type
*array_type
= glsl_type::get_array_instance(vec_type
,
780 return array_type
->std140_size(false);
783 /* (4) If the member is an array of scalars or vectors, the base alignment
784 * and array stride are set to match the base alignment of a single
785 * array element, according to rules (1), (2), and (3), and rounded up
786 * to the base alignment of a vec4. The array may have padding at the
787 * end; the base offset of the member following the array is rounded up
788 * to the next multiple of the base alignment.
790 * (10) If the member is an array of <S> structures, the <S> elements of
791 * the array are laid out in order, according to rule (9).
793 if (this->is_array()) {
794 if (this->fields
.array
->is_record()) {
795 return this->length
* this->fields
.array
->std140_size(row_major
);
797 unsigned element_base_align
=
798 this->fields
.array
->std140_base_alignment(row_major
);
799 return this->length
* MAX2(element_base_align
, 16);
803 /* (9) If the member is a structure, the base alignment of the
804 * structure is <N>, where <N> is the largest base alignment
805 * value of any of its members, and rounded up to the base
806 * alignment of a vec4. The individual members of this
807 * sub-structure are then assigned offsets by applying this set
808 * of rules recursively, where the base offset of the first
809 * member of the sub-structure is equal to the aligned offset
810 * of the structure. The structure may have padding at the end;
811 * the base offset of the member following the sub-structure is
812 * rounded up to the next multiple of the base alignment of the
815 if (this->is_record()) {
817 for (unsigned i
= 0; i
< this->length
; i
++) {
818 const struct glsl_type
*field_type
= this->fields
.structure
[i
].type
;
819 unsigned align
= field_type
->std140_base_alignment(row_major
);
820 size
= glsl_align(size
, align
);
821 size
+= field_type
->std140_size(row_major
);
823 size
= glsl_align(size
,
824 this->fields
.structure
[0].type
->std140_base_alignment(row_major
));
828 assert(!"not reached");
834 glsl_type::count_attribute_slots() const
836 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
838 * "A scalar input counts the same amount against this limit as a vec4,
839 * so applications may want to consider packing groups of four
840 * unrelated float inputs together into a vector to better utilize the
841 * capabilities of the underlying hardware. A matrix input will use up
842 * multiple locations. The number of locations used will equal the
843 * number of columns in the matrix."
845 * The spec does not explicitly say how arrays are counted. However, it
846 * should be safe to assume the total number of slots consumed by an array
847 * is the number of entries in the array multiplied by the number of slots
848 * consumed by a single element of the array.
850 * The spec says nothing about how structs are counted, because vertex
851 * attributes are not allowed to be (or contain) structs. However, Mesa
852 * allows varying structs, the number of varying slots taken up by a
853 * varying struct is simply equal to the sum of the number of slots taken
854 * up by each element.
856 switch (this->base_type
) {
859 case GLSL_TYPE_FLOAT
:
861 return this->matrix_columns
;
863 case GLSL_TYPE_STRUCT
:
864 case GLSL_TYPE_INTERFACE
: {
867 for (unsigned i
= 0; i
< this->length
; i
++)
868 size
+= this->fields
.structure
[i
].type
->count_attribute_slots();
873 case GLSL_TYPE_ARRAY
:
874 return this->length
* this->fields
.array
->count_attribute_slots();
876 case GLSL_TYPE_SAMPLER
:
878 case GLSL_TYPE_ERROR
:
882 assert(!"Unexpected type in count_attribute_slots()");