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25 * \file link_interface_blocks.cpp
26 * Linker support for GLSL's interface blocks.
30 #include "glsl_symbol_table.h"
32 #include "main/macros.h"
33 #include "util/hash_table.h"
39 * Check if two interfaces match, according to intrastage interface matching
40 * rules. If they do, and the first interface uses an unsized array, it will
41 * be updated to reflect the array size declared in the second interface.
44 intrastage_match(ir_variable
*a
,
46 struct gl_shader_program
*prog
)
48 /* Types must match. */
49 if (a
->get_interface_type() != b
->get_interface_type()) {
50 /* Exception: if both the interface blocks are implicitly declared,
51 * don't force their types to match. They might mismatch due to the two
52 * shaders using different GLSL versions, and that's ok.
54 if (a
->data
.how_declared
!= ir_var_declared_implicitly
||
55 b
->data
.how_declared
!= ir_var_declared_implicitly
)
59 /* Presence/absence of interface names must match. */
60 if (a
->is_interface_instance() != b
->is_interface_instance())
63 /* For uniforms, instance names need not match. For shader ins/outs,
64 * it's not clear from the spec whether they need to match, but
65 * Mesa's implementation relies on them matching.
67 if (a
->is_interface_instance() && b
->data
.mode
!= ir_var_uniform
&&
68 b
->data
.mode
!= ir_var_shader_storage
&&
69 strcmp(a
->name
, b
->name
) != 0) {
73 /* If a block is an array then it must match across the shader.
74 * Unsized arrays are also processed and matched agaist sized arrays.
76 if (b
->type
!= a
->type
&&
77 (b
->is_interface_instance() || a
->is_interface_instance()) &&
78 !validate_intrastage_arrays(prog
, b
, a
))
85 * Return true if interface members mismatch and its not allowed by GLSL.
88 interstage_member_mismatch(struct gl_shader_program
*prog
,
89 const glsl_type
*c
, const glsl_type
*p
) {
91 if (c
->length
!= p
->length
)
94 for (unsigned i
= 0; i
< c
->length
; i
++) {
95 if (c
->fields
.structure
[i
].type
!= p
->fields
.structure
[i
].type
)
97 if (strcmp(c
->fields
.structure
[i
].name
,
98 p
->fields
.structure
[i
].name
) != 0)
100 if (c
->fields
.structure
[i
].location
!=
101 p
->fields
.structure
[i
].location
)
103 if (c
->fields
.structure
[i
].patch
!=
104 p
->fields
.structure
[i
].patch
)
107 /* From Section 4.5 (Interpolation Qualifiers) of the GLSL 4.40 spec:
109 * "It is a link-time error if, within the same stage, the
110 * interpolation qualifiers of variables of the same name do not
113 if (prog
->IsES
|| prog
->Version
< 440)
114 if (c
->fields
.structure
[i
].interpolation
!=
115 p
->fields
.structure
[i
].interpolation
)
118 /* From Section 4.3.4 (Input Variables) of the GLSL ES 3.0 spec:
120 * "The output of the vertex shader and the input of the fragment
121 * shader form an interface. For this interface, vertex shader
122 * output variables and fragment shader input variables of the same
123 * name must match in type and qualification (other than precision
124 * and out matching to in).
126 * The table in Section 9.2.1 Linked Shaders of the GLSL ES 3.1 spec
127 * says that centroid no longer needs to match for varyings.
129 * The table in Section 9.2.1 Linked Shaders of the GLSL ES 3.2 spec
130 * says that sample need not match for varyings.
132 if (!prog
->IsES
|| prog
->Version
< 310)
133 if (c
->fields
.structure
[i
].centroid
!=
134 p
->fields
.structure
[i
].centroid
)
137 if (c
->fields
.structure
[i
].sample
!=
138 p
->fields
.structure
[i
].sample
)
146 * Check if two interfaces match, according to interstage (in/out) interface
149 * If \c extra_array_level is true, the consumer interface is required to be
150 * an array and the producer interface is required to be a non-array.
151 * This is used for tessellation control and geometry shader consumers.
154 interstage_match(struct gl_shader_program
*prog
, ir_variable
*producer
,
155 ir_variable
*consumer
, bool extra_array_level
)
157 /* Types must match. */
158 if (consumer
->get_interface_type() != producer
->get_interface_type()) {
159 /* Exception: if both the interface blocks are implicitly declared,
160 * don't force their types to match. They might mismatch due to the two
161 * shaders using different GLSL versions, and that's ok.
163 * Also we store some member information such as interpolation in
164 * glsl_type that doesn't always have to match across shader stages.
165 * Therefore we make a pass over the members glsl_struct_field to make
166 * sure we don't reject shaders where fields don't need to match.
168 if ((consumer
->data
.how_declared
!= ir_var_declared_implicitly
||
169 producer
->data
.how_declared
!= ir_var_declared_implicitly
) &&
170 interstage_member_mismatch(prog
, consumer
->get_interface_type(),
171 producer
->get_interface_type()))
175 /* Ignore outermost array if geom shader */
176 const glsl_type
*consumer_instance_type
;
177 if (extra_array_level
) {
178 consumer_instance_type
= consumer
->type
->fields
.array
;
180 consumer_instance_type
= consumer
->type
;
183 /* If a block is an array then it must match across shaders.
184 * Since unsized arrays have been ruled out, we can check this by just
185 * making sure the types are equal.
187 if ((consumer
->is_interface_instance() &&
188 consumer_instance_type
->is_array()) ||
189 (producer
->is_interface_instance() &&
190 producer
->type
->is_array())) {
191 if (consumer_instance_type
!= producer
->type
)
200 * This class keeps track of a mapping from an interface block name to the
201 * necessary information about that interface block to determine whether to
202 * generate a link error.
204 * Note: this class is expected to be short lived, so it doesn't make copies
205 * of the strings it references; it simply borrows the pointers from the
208 class interface_block_definitions
211 interface_block_definitions()
212 : mem_ctx(ralloc_context(NULL
)),
213 ht(_mesa_hash_table_create(NULL
, _mesa_key_hash_string
,
214 _mesa_key_string_equal
))
218 ~interface_block_definitions()
220 ralloc_free(mem_ctx
);
221 _mesa_hash_table_destroy(ht
, NULL
);
225 * Lookup the interface definition. Return NULL if none is found.
227 ir_variable
*lookup(ir_variable
*var
)
229 if (var
->data
.explicit_location
&&
230 var
->data
.location
>= VARYING_SLOT_VAR0
) {
231 char location_str
[11];
232 snprintf(location_str
, 11, "%d", var
->data
.location
);
234 const struct hash_entry
*entry
=
235 _mesa_hash_table_search(ht
, location_str
);
236 return entry
? (ir_variable
*) entry
->data
: NULL
;
238 const struct hash_entry
*entry
=
239 _mesa_hash_table_search(ht
,
240 var
->get_interface_type()->without_array()->name
);
241 return entry
? (ir_variable
*) entry
->data
: NULL
;
246 * Add a new interface definition.
248 void store(ir_variable
*var
)
250 if (var
->data
.explicit_location
&&
251 var
->data
.location
>= VARYING_SLOT_VAR0
) {
252 /* If explicit location is given then lookup the variable by location.
253 * We turn the location into a string and use this as the hash key
254 * rather than the name. Note: We allocate enough space for a 32-bit
255 * unsigned location value which is overkill but future proof.
257 char location_str
[11];
258 snprintf(location_str
, 11, "%d", var
->data
.location
);
259 _mesa_hash_table_insert(ht
, ralloc_strdup(mem_ctx
, location_str
), var
);
261 _mesa_hash_table_insert(ht
,
262 var
->get_interface_type()->without_array()->name
, var
);
268 * Ralloc context for data structures allocated by this class.
273 * Hash table mapping interface block name to an \c
280 }; /* anonymous namespace */
284 validate_intrastage_interface_blocks(struct gl_shader_program
*prog
,
285 const gl_shader
**shader_list
,
286 unsigned num_shaders
)
288 interface_block_definitions in_interfaces
;
289 interface_block_definitions out_interfaces
;
290 interface_block_definitions uniform_interfaces
;
291 interface_block_definitions buffer_interfaces
;
293 for (unsigned int i
= 0; i
< num_shaders
; i
++) {
294 if (shader_list
[i
] == NULL
)
297 foreach_in_list(ir_instruction
, node
, shader_list
[i
]->ir
) {
298 ir_variable
*var
= node
->as_variable();
302 const glsl_type
*iface_type
= var
->get_interface_type();
304 if (iface_type
== NULL
)
307 interface_block_definitions
*definitions
;
308 switch (var
->data
.mode
) {
309 case ir_var_shader_in
:
310 definitions
= &in_interfaces
;
312 case ir_var_shader_out
:
313 definitions
= &out_interfaces
;
316 definitions
= &uniform_interfaces
;
318 case ir_var_shader_storage
:
319 definitions
= &buffer_interfaces
;
322 /* Only in, out, and uniform interfaces are legal, so we should
325 assert(!"illegal interface type");
329 ir_variable
*prev_def
= definitions
->lookup(var
);
330 if (prev_def
== NULL
) {
331 /* This is the first time we've seen the interface, so save
332 * it into the appropriate data structure.
334 definitions
->store(var
);
335 } else if (!intrastage_match(prev_def
, var
, prog
)) {
336 linker_error(prog
, "definitions of interface block `%s' do not"
337 " match\n", iface_type
->name
);
345 validate_interstage_inout_blocks(struct gl_shader_program
*prog
,
346 const gl_linked_shader
*producer
,
347 const gl_linked_shader
*consumer
)
349 interface_block_definitions definitions
;
350 /* VS -> GS, VS -> TCS, VS -> TES, TES -> GS */
351 const bool extra_array_level
= (producer
->Stage
== MESA_SHADER_VERTEX
&&
352 consumer
->Stage
!= MESA_SHADER_FRAGMENT
) ||
353 consumer
->Stage
== MESA_SHADER_GEOMETRY
;
355 /* Add input interfaces from the consumer to the symbol table. */
356 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
357 ir_variable
*var
= node
->as_variable();
358 if (!var
|| !var
->get_interface_type() || var
->data
.mode
!= ir_var_shader_in
)
361 definitions
.store(var
);
364 /* Verify that the producer's output interfaces match. */
365 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
366 ir_variable
*var
= node
->as_variable();
367 if (!var
|| !var
->get_interface_type() || var
->data
.mode
!= ir_var_shader_out
)
370 ir_variable
*consumer_def
= definitions
.lookup(var
);
372 /* The consumer doesn't use this output block. Ignore it. */
373 if (consumer_def
== NULL
)
376 if (!interstage_match(prog
, var
, consumer_def
, extra_array_level
)) {
377 linker_error(prog
, "definitions of interface block `%s' do not "
378 "match\n", var
->get_interface_type()->name
);
386 validate_interstage_uniform_blocks(struct gl_shader_program
*prog
,
387 gl_linked_shader
**stages
)
389 interface_block_definitions definitions
;
391 for (int i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
392 if (stages
[i
] == NULL
)
395 const gl_linked_shader
*stage
= stages
[i
];
396 foreach_in_list(ir_instruction
, node
, stage
->ir
) {
397 ir_variable
*var
= node
->as_variable();
398 if (!var
|| !var
->get_interface_type() ||
399 (var
->data
.mode
!= ir_var_uniform
&&
400 var
->data
.mode
!= ir_var_shader_storage
))
403 ir_variable
*old_def
= definitions
.lookup(var
);
404 if (old_def
== NULL
) {
405 definitions
.store(var
);
407 /* Interstage uniform matching rules are the same as intrastage
408 * uniform matchin rules (for uniforms, it is as though all
409 * shaders are in the same shader stage).
411 if (!intrastage_match(old_def
, var
, prog
)) {
412 linker_error(prog
, "definitions of uniform block `%s' do not "
413 "match\n", var
->get_interface_type()->name
);