forked from KolibriOS/kolibrios
1192 lines
39 KiB
C++
1192 lines
39 KiB
C++
/*
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* Copyright © 2012 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file link_varyings.cpp
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*
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* Linker functions related specifically to linking varyings between shader
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* stages.
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*/
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#include "main/mtypes.h"
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#include "glsl_symbol_table.h"
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#include "glsl_parser_extras.h"
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#include "ir_optimization.h"
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#include "linker.h"
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#include "link_varyings.h"
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#include "main/macros.h"
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#include "program/hash_table.h"
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#include "program.h"
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/**
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* Validate that outputs from one stage match inputs of another
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*/
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bool
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cross_validate_outputs_to_inputs(struct gl_shader_program *prog,
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gl_shader *producer, gl_shader *consumer)
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{
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glsl_symbol_table parameters;
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const char *const producer_stage =
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_mesa_glsl_shader_target_name(producer->Type);
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const char *const consumer_stage =
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_mesa_glsl_shader_target_name(consumer->Type);
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/* Find all shader outputs in the "producer" stage.
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*/
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foreach_list(node, producer->ir) {
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ir_variable *const var = ((ir_instruction *) node)->as_variable();
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if ((var == NULL) || (var->mode != ir_var_shader_out))
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continue;
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parameters.add_variable(var);
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}
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/* Find all shader inputs in the "consumer" stage. Any variables that have
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* matching outputs already in the symbol table must have the same type and
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* qualifiers.
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*/
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foreach_list(node, consumer->ir) {
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ir_variable *const input = ((ir_instruction *) node)->as_variable();
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if ((input == NULL) || (input->mode != ir_var_shader_in))
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continue;
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ir_variable *const output = parameters.get_variable(input->name);
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if (output != NULL) {
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/* Check that the types match between stages.
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*/
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if (input->type != output->type) {
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/* There is a bit of a special case for gl_TexCoord. This
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* built-in is unsized by default. Applications that variable
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* access it must redeclare it with a size. There is some
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* language in the GLSL spec that implies the fragment shader
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* and vertex shader do not have to agree on this size. Other
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* driver behave this way, and one or two applications seem to
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* rely on it.
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*
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* Neither declaration needs to be modified here because the array
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* sizes are fixed later when update_array_sizes is called.
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*
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* From page 48 (page 54 of the PDF) of the GLSL 1.10 spec:
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*
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* "Unlike user-defined varying variables, the built-in
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* varying variables don't have a strict one-to-one
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* correspondence between the vertex language and the
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* fragment language."
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*/
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if (!output->type->is_array()
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|| (strncmp("gl_", output->name, 3) != 0)) {
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linker_error(prog,
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"%s shader output `%s' declared as type `%s', "
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"but %s shader input declared as type `%s'\n",
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producer_stage, output->name,
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output->type->name,
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consumer_stage, input->type->name);
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return false;
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}
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}
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/* Check that all of the qualifiers match between stages.
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*/
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if (input->centroid != output->centroid) {
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linker_error(prog,
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"%s shader output `%s' %s centroid qualifier, "
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"but %s shader input %s centroid qualifier\n",
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producer_stage,
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output->name,
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(output->centroid) ? "has" : "lacks",
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consumer_stage,
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(input->centroid) ? "has" : "lacks");
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return false;
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}
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if (input->invariant != output->invariant) {
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linker_error(prog,
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"%s shader output `%s' %s invariant qualifier, "
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"but %s shader input %s invariant qualifier\n",
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producer_stage,
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output->name,
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(output->invariant) ? "has" : "lacks",
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consumer_stage,
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(input->invariant) ? "has" : "lacks");
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return false;
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}
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if (input->interpolation != output->interpolation) {
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linker_error(prog,
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"%s shader output `%s' specifies %s "
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"interpolation qualifier, "
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"but %s shader input specifies %s "
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"interpolation qualifier\n",
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producer_stage,
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output->name,
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output->interpolation_string(),
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consumer_stage,
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input->interpolation_string());
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return false;
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}
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}
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}
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return true;
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}
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/**
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* Initialize this object based on a string that was passed to
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* glTransformFeedbackVaryings.
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*
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* If the input is mal-formed, this call still succeeds, but it sets
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* this->var_name to a mal-formed input, so tfeedback_decl::find_output_var()
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* will fail to find any matching variable.
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*/
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void
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tfeedback_decl::init(struct gl_context *ctx, struct gl_shader_program *prog,
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const void *mem_ctx, const char *input)
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{
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/* We don't have to be pedantic about what is a valid GLSL variable name,
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* because any variable with an invalid name can't exist in the IR anyway.
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*/
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this->location = -1;
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this->orig_name = input;
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this->is_clip_distance_mesa = false;
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this->skip_components = 0;
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this->next_buffer_separator = false;
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this->matched_candidate = NULL;
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if (ctx->Extensions.ARB_transform_feedback3) {
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/* Parse gl_NextBuffer. */
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if (strcmp(input, "gl_NextBuffer") == 0) {
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this->next_buffer_separator = true;
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return;
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}
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/* Parse gl_SkipComponents. */
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if (strcmp(input, "gl_SkipComponents1") == 0)
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this->skip_components = 1;
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else if (strcmp(input, "gl_SkipComponents2") == 0)
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this->skip_components = 2;
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else if (strcmp(input, "gl_SkipComponents3") == 0)
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this->skip_components = 3;
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else if (strcmp(input, "gl_SkipComponents4") == 0)
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this->skip_components = 4;
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if (this->skip_components)
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return;
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}
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/* Parse a declaration. */
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const char *base_name_end;
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long subscript = parse_program_resource_name(input, &base_name_end);
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this->var_name = ralloc_strndup(mem_ctx, input, base_name_end - input);
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if (subscript >= 0) {
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this->array_subscript = subscript;
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this->is_subscripted = true;
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} else {
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this->is_subscripted = false;
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}
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/* For drivers that lower gl_ClipDistance to gl_ClipDistanceMESA, this
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* class must behave specially to account for the fact that gl_ClipDistance
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* is converted from a float[8] to a vec4[2].
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*/
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if (ctx->ShaderCompilerOptions[MESA_SHADER_VERTEX].LowerClipDistance &&
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strcmp(this->var_name, "gl_ClipDistance") == 0) {
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this->is_clip_distance_mesa = true;
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}
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}
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/**
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* Determine whether two tfeedback_decl objects refer to the same variable and
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* array index (if applicable).
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*/
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bool
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tfeedback_decl::is_same(const tfeedback_decl &x, const tfeedback_decl &y)
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{
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assert(x.is_varying() && y.is_varying());
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if (strcmp(x.var_name, y.var_name) != 0)
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return false;
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if (x.is_subscripted != y.is_subscripted)
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return false;
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if (x.is_subscripted && x.array_subscript != y.array_subscript)
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return false;
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return true;
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}
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/**
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* Assign a location for this tfeedback_decl object based on the transform
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* feedback candidate found by find_candidate.
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*
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* If an error occurs, the error is reported through linker_error() and false
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* is returned.
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*/
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bool
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tfeedback_decl::assign_location(struct gl_context *ctx,
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struct gl_shader_program *prog)
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{
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assert(this->is_varying());
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unsigned fine_location
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= this->matched_candidate->toplevel_var->location * 4
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+ this->matched_candidate->toplevel_var->location_frac
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+ this->matched_candidate->offset;
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if (this->matched_candidate->type->is_array()) {
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/* Array variable */
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const unsigned matrix_cols =
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this->matched_candidate->type->fields.array->matrix_columns;
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const unsigned vector_elements =
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this->matched_candidate->type->fields.array->vector_elements;
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unsigned actual_array_size = this->is_clip_distance_mesa ?
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prog->Vert.ClipDistanceArraySize :
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this->matched_candidate->type->array_size();
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if (this->is_subscripted) {
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/* Check array bounds. */
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if (this->array_subscript >= actual_array_size) {
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linker_error(prog, "Transform feedback varying %s has index "
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"%i, but the array size is %u.",
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this->orig_name, this->array_subscript,
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actual_array_size);
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return false;
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}
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unsigned array_elem_size = this->is_clip_distance_mesa ?
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1 : vector_elements * matrix_cols;
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fine_location += array_elem_size * this->array_subscript;
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this->size = 1;
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} else {
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this->size = actual_array_size;
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}
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this->vector_elements = vector_elements;
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this->matrix_columns = matrix_cols;
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if (this->is_clip_distance_mesa)
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this->type = GL_FLOAT;
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else
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this->type = this->matched_candidate->type->fields.array->gl_type;
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} else {
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/* Regular variable (scalar, vector, or matrix) */
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if (this->is_subscripted) {
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linker_error(prog, "Transform feedback varying %s requested, "
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"but %s is not an array.",
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this->orig_name, this->var_name);
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return false;
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}
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this->size = 1;
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this->vector_elements = this->matched_candidate->type->vector_elements;
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this->matrix_columns = this->matched_candidate->type->matrix_columns;
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this->type = this->matched_candidate->type->gl_type;
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}
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this->location = fine_location / 4;
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this->location_frac = fine_location % 4;
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/* From GL_EXT_transform_feedback:
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* A program will fail to link if:
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*
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* * the total number of components to capture in any varying
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* variable in <varyings> is greater than the constant
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* MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT and the
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* buffer mode is SEPARATE_ATTRIBS_EXT;
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*/
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if (prog->TransformFeedback.BufferMode == GL_SEPARATE_ATTRIBS &&
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this->num_components() >
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ctx->Const.MaxTransformFeedbackSeparateComponents) {
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linker_error(prog, "Transform feedback varying %s exceeds "
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"MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS.",
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this->orig_name);
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return false;
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}
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return true;
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}
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unsigned
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tfeedback_decl::get_num_outputs() const
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{
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if (!this->is_varying()) {
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return 0;
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}
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return (this->num_components() + this->location_frac + 3)/4;
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}
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/**
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* Update gl_transform_feedback_info to reflect this tfeedback_decl.
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*
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* If an error occurs, the error is reported through linker_error() and false
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* is returned.
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*/
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bool
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tfeedback_decl::store(struct gl_context *ctx, struct gl_shader_program *prog,
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struct gl_transform_feedback_info *info,
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unsigned buffer, const unsigned max_outputs) const
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{
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assert(!this->next_buffer_separator);
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/* Handle gl_SkipComponents. */
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if (this->skip_components) {
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info->BufferStride[buffer] += this->skip_components;
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return true;
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}
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/* From GL_EXT_transform_feedback:
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* A program will fail to link if:
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*
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* * the total number of components to capture is greater than
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* the constant MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT
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* and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
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*/
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if (prog->TransformFeedback.BufferMode == GL_INTERLEAVED_ATTRIBS &&
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info->BufferStride[buffer] + this->num_components() >
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ctx->Const.MaxTransformFeedbackInterleavedComponents) {
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linker_error(prog, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
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"limit has been exceeded.");
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return false;
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}
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unsigned location = this->location;
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unsigned location_frac = this->location_frac;
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unsigned num_components = this->num_components();
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while (num_components > 0) {
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unsigned output_size = MIN2(num_components, 4 - location_frac);
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assert(info->NumOutputs < max_outputs);
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info->Outputs[info->NumOutputs].ComponentOffset = location_frac;
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info->Outputs[info->NumOutputs].OutputRegister = location;
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info->Outputs[info->NumOutputs].NumComponents = output_size;
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info->Outputs[info->NumOutputs].OutputBuffer = buffer;
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info->Outputs[info->NumOutputs].DstOffset = info->BufferStride[buffer];
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++info->NumOutputs;
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info->BufferStride[buffer] += output_size;
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num_components -= output_size;
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location++;
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location_frac = 0;
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}
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info->Varyings[info->NumVarying].Name = ralloc_strdup(prog, this->orig_name);
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info->Varyings[info->NumVarying].Type = this->type;
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info->Varyings[info->NumVarying].Size = this->size;
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info->NumVarying++;
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return true;
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}
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const tfeedback_candidate *
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tfeedback_decl::find_candidate(gl_shader_program *prog,
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hash_table *tfeedback_candidates)
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{
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const char *name = this->is_clip_distance_mesa
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? "gl_ClipDistanceMESA" : this->var_name;
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this->matched_candidate = (const tfeedback_candidate *)
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hash_table_find(tfeedback_candidates, name);
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if (!this->matched_candidate) {
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/* From GL_EXT_transform_feedback:
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* A program will fail to link if:
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*
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* * any variable name specified in the <varyings> array is not
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* declared as an output in the geometry shader (if present) or
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* the vertex shader (if no geometry shader is present);
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*/
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linker_error(prog, "Transform feedback varying %s undeclared.",
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this->orig_name);
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}
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return this->matched_candidate;
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}
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/**
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* Parse all the transform feedback declarations that were passed to
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* glTransformFeedbackVaryings() and store them in tfeedback_decl objects.
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*
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* If an error occurs, the error is reported through linker_error() and false
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* is returned.
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*/
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bool
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parse_tfeedback_decls(struct gl_context *ctx, struct gl_shader_program *prog,
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const void *mem_ctx, unsigned num_names,
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char **varying_names, tfeedback_decl *decls)
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{
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for (unsigned i = 0; i < num_names; ++i) {
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decls[i].init(ctx, prog, mem_ctx, varying_names[i]);
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if (!decls[i].is_varying())
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continue;
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/* From GL_EXT_transform_feedback:
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* A program will fail to link if:
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*
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* * any two entries in the <varyings> array specify the same varying
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* variable;
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*
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* We interpret this to mean "any two entries in the <varyings> array
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* specify the same varying variable and array index", since transform
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* feedback of arrays would be useless otherwise.
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*/
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for (unsigned j = 0; j < i; ++j) {
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if (!decls[j].is_varying())
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continue;
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if (tfeedback_decl::is_same(decls[i], decls[j])) {
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linker_error(prog, "Transform feedback varying %s specified "
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"more than once.", varying_names[i]);
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return false;
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}
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}
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}
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return true;
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}
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|
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/**
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* Store transform feedback location assignments into
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* prog->LinkedTransformFeedback based on the data stored in tfeedback_decls.
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*
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* If an error occurs, the error is reported through linker_error() and false
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* is returned.
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*/
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bool
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store_tfeedback_info(struct gl_context *ctx, struct gl_shader_program *prog,
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unsigned num_tfeedback_decls,
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tfeedback_decl *tfeedback_decls)
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{
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bool separate_attribs_mode =
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prog->TransformFeedback.BufferMode == GL_SEPARATE_ATTRIBS;
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ralloc_free(prog->LinkedTransformFeedback.Varyings);
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ralloc_free(prog->LinkedTransformFeedback.Outputs);
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memset(&prog->LinkedTransformFeedback, 0,
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sizeof(prog->LinkedTransformFeedback));
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prog->LinkedTransformFeedback.Varyings =
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rzalloc_array(prog,
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struct gl_transform_feedback_varying_info,
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num_tfeedback_decls);
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unsigned num_outputs = 0;
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for (unsigned i = 0; i < num_tfeedback_decls; ++i)
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num_outputs += tfeedback_decls[i].get_num_outputs();
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prog->LinkedTransformFeedback.Outputs =
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rzalloc_array(prog,
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struct gl_transform_feedback_output,
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num_outputs);
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|
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unsigned num_buffers = 0;
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|
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if (separate_attribs_mode) {
|
|
/* GL_SEPARATE_ATTRIBS */
|
|
for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
|
|
if (!tfeedback_decls[i].store(ctx, prog, &prog->LinkedTransformFeedback,
|
|
num_buffers, num_outputs))
|
|
return false;
|
|
|
|
num_buffers++;
|
|
}
|
|
}
|
|
else {
|
|
/* GL_INVERLEAVED_ATTRIBS */
|
|
for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
|
|
if (tfeedback_decls[i].is_next_buffer_separator()) {
|
|
num_buffers++;
|
|
continue;
|
|
}
|
|
|
|
if (!tfeedback_decls[i].store(ctx, prog,
|
|
&prog->LinkedTransformFeedback,
|
|
num_buffers, num_outputs))
|
|
return false;
|
|
}
|
|
num_buffers++;
|
|
}
|
|
|
|
assert(prog->LinkedTransformFeedback.NumOutputs == num_outputs);
|
|
|
|
prog->LinkedTransformFeedback.NumBuffers = num_buffers;
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Data structure recording the relationship between outputs of one shader
|
|
* stage (the "producer") and inputs of another (the "consumer").
|
|
*/
|
|
class varying_matches
|
|
{
|
|
public:
|
|
varying_matches(bool disable_varying_packing, bool consumer_is_fs);
|
|
~varying_matches();
|
|
void record(ir_variable *producer_var, ir_variable *consumer_var);
|
|
unsigned assign_locations();
|
|
void store_locations(unsigned producer_base, unsigned consumer_base) const;
|
|
|
|
private:
|
|
/**
|
|
* If true, this driver disables varying packing, so all varyings need to
|
|
* be aligned on slot boundaries, and take up a number of slots equal to
|
|
* their number of matrix columns times their array size.
|
|
*/
|
|
const bool disable_varying_packing;
|
|
|
|
/**
|
|
* Enum representing the order in which varyings are packed within a
|
|
* packing class.
|
|
*
|
|
* Currently we pack vec4's first, then vec2's, then scalar values, then
|
|
* vec3's. This order ensures that the only vectors that are at risk of
|
|
* having to be "double parked" (split between two adjacent varying slots)
|
|
* are the vec3's.
|
|
*/
|
|
enum packing_order_enum {
|
|
PACKING_ORDER_VEC4,
|
|
PACKING_ORDER_VEC2,
|
|
PACKING_ORDER_SCALAR,
|
|
PACKING_ORDER_VEC3,
|
|
};
|
|
|
|
static unsigned compute_packing_class(ir_variable *var);
|
|
static packing_order_enum compute_packing_order(ir_variable *var);
|
|
static int match_comparator(const void *x_generic, const void *y_generic);
|
|
|
|
/**
|
|
* Structure recording the relationship between a single producer output
|
|
* and a single consumer input.
|
|
*/
|
|
struct match {
|
|
/**
|
|
* Packing class for this varying, computed by compute_packing_class().
|
|
*/
|
|
unsigned packing_class;
|
|
|
|
/**
|
|
* Packing order for this varying, computed by compute_packing_order().
|
|
*/
|
|
packing_order_enum packing_order;
|
|
unsigned num_components;
|
|
|
|
/**
|
|
* The output variable in the producer stage.
|
|
*/
|
|
ir_variable *producer_var;
|
|
|
|
/**
|
|
* The input variable in the consumer stage.
|
|
*/
|
|
ir_variable *consumer_var;
|
|
|
|
/**
|
|
* The location which has been assigned for this varying. This is
|
|
* expressed in multiples of a float, with the first generic varying
|
|
* (i.e. the one referred to by VARYING_SLOT_VAR0) represented by the
|
|
* value 0.
|
|
*/
|
|
unsigned generic_location;
|
|
} *matches;
|
|
|
|
/**
|
|
* The number of elements in the \c matches array that are currently in
|
|
* use.
|
|
*/
|
|
unsigned num_matches;
|
|
|
|
/**
|
|
* The number of elements that were set aside for the \c matches array when
|
|
* it was allocated.
|
|
*/
|
|
unsigned matches_capacity;
|
|
|
|
const bool consumer_is_fs;
|
|
};
|
|
|
|
|
|
varying_matches::varying_matches(bool disable_varying_packing,
|
|
bool consumer_is_fs)
|
|
: disable_varying_packing(disable_varying_packing),
|
|
consumer_is_fs(consumer_is_fs)
|
|
{
|
|
/* Note: this initial capacity is rather arbitrarily chosen to be large
|
|
* enough for many cases without wasting an unreasonable amount of space.
|
|
* varying_matches::record() will resize the array if there are more than
|
|
* this number of varyings.
|
|
*/
|
|
this->matches_capacity = 8;
|
|
this->matches = (match *)
|
|
malloc(sizeof(*this->matches) * this->matches_capacity);
|
|
this->num_matches = 0;
|
|
}
|
|
|
|
|
|
varying_matches::~varying_matches()
|
|
{
|
|
free(this->matches);
|
|
}
|
|
|
|
|
|
/**
|
|
* Record the given producer/consumer variable pair in the list of variables
|
|
* that should later be assigned locations.
|
|
*
|
|
* It is permissible for \c consumer_var to be NULL (this happens if a
|
|
* variable is output by the producer and consumed by transform feedback, but
|
|
* not consumed by the consumer).
|
|
*
|
|
* If \c producer_var has already been paired up with a consumer_var, or
|
|
* producer_var is part of fixed pipeline functionality (and hence already has
|
|
* a location assigned), this function has no effect.
|
|
*
|
|
* Note: as a side effect this function may change the interpolation type of
|
|
* \c producer_var, but only when the change couldn't possibly affect
|
|
* rendering.
|
|
*/
|
|
void
|
|
varying_matches::record(ir_variable *producer_var, ir_variable *consumer_var)
|
|
{
|
|
if (!producer_var->is_unmatched_generic_inout) {
|
|
/* Either a location already exists for this variable (since it is part
|
|
* of fixed functionality), or it has already been recorded as part of a
|
|
* previous match.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if ((consumer_var == NULL && producer_var->type->contains_integer()) ||
|
|
!consumer_is_fs) {
|
|
/* Since this varying is not being consumed by the fragment shader, its
|
|
* interpolation type varying cannot possibly affect rendering. Also,
|
|
* this variable is non-flat and is (or contains) an integer.
|
|
*
|
|
* lower_packed_varyings requires all integer varyings to flat,
|
|
* regardless of where they appear. We can trivially satisfy that
|
|
* requirement by changing the interpolation type to flat here.
|
|
*/
|
|
producer_var->centroid = false;
|
|
producer_var->interpolation = INTERP_QUALIFIER_FLAT;
|
|
|
|
if (consumer_var) {
|
|
consumer_var->centroid = false;
|
|
consumer_var->interpolation = INTERP_QUALIFIER_FLAT;
|
|
}
|
|
}
|
|
|
|
if (this->num_matches == this->matches_capacity) {
|
|
this->matches_capacity *= 2;
|
|
this->matches = (match *)
|
|
realloc(this->matches,
|
|
sizeof(*this->matches) * this->matches_capacity);
|
|
}
|
|
this->matches[this->num_matches].packing_class
|
|
= this->compute_packing_class(producer_var);
|
|
this->matches[this->num_matches].packing_order
|
|
= this->compute_packing_order(producer_var);
|
|
if (this->disable_varying_packing) {
|
|
unsigned slots = producer_var->type->is_array()
|
|
? (producer_var->type->length
|
|
* producer_var->type->fields.array->matrix_columns)
|
|
: producer_var->type->matrix_columns;
|
|
this->matches[this->num_matches].num_components = 4 * slots;
|
|
} else {
|
|
this->matches[this->num_matches].num_components
|
|
= producer_var->type->component_slots();
|
|
}
|
|
this->matches[this->num_matches].producer_var = producer_var;
|
|
this->matches[this->num_matches].consumer_var = consumer_var;
|
|
this->num_matches++;
|
|
producer_var->is_unmatched_generic_inout = 0;
|
|
if (consumer_var)
|
|
consumer_var->is_unmatched_generic_inout = 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Choose locations for all of the variable matches that were previously
|
|
* passed to varying_matches::record().
|
|
*/
|
|
unsigned
|
|
varying_matches::assign_locations()
|
|
{
|
|
/* Sort varying matches into an order that makes them easy to pack. */
|
|
qsort(this->matches, this->num_matches, sizeof(*this->matches),
|
|
&varying_matches::match_comparator);
|
|
|
|
unsigned generic_location = 0;
|
|
|
|
for (unsigned i = 0; i < this->num_matches; i++) {
|
|
/* Advance to the next slot if this varying has a different packing
|
|
* class than the previous one, and we're not already on a slot
|
|
* boundary.
|
|
*/
|
|
if (i > 0 &&
|
|
this->matches[i - 1].packing_class
|
|
!= this->matches[i].packing_class) {
|
|
generic_location = ALIGN(generic_location, 4);
|
|
}
|
|
|
|
this->matches[i].generic_location = generic_location;
|
|
|
|
generic_location += this->matches[i].num_components;
|
|
}
|
|
|
|
return (generic_location + 3) / 4;
|
|
}
|
|
|
|
|
|
/**
|
|
* Update the producer and consumer shaders to reflect the locations
|
|
* assignments that were made by varying_matches::assign_locations().
|
|
*/
|
|
void
|
|
varying_matches::store_locations(unsigned producer_base,
|
|
unsigned consumer_base) const
|
|
{
|
|
for (unsigned i = 0; i < this->num_matches; i++) {
|
|
ir_variable *producer_var = this->matches[i].producer_var;
|
|
ir_variable *consumer_var = this->matches[i].consumer_var;
|
|
unsigned generic_location = this->matches[i].generic_location;
|
|
unsigned slot = generic_location / 4;
|
|
unsigned offset = generic_location % 4;
|
|
|
|
producer_var->location = producer_base + slot;
|
|
producer_var->location_frac = offset;
|
|
if (consumer_var) {
|
|
assert(consumer_var->location == -1);
|
|
consumer_var->location = consumer_base + slot;
|
|
consumer_var->location_frac = offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Compute the "packing class" of the given varying. This is an unsigned
|
|
* integer with the property that two variables in the same packing class can
|
|
* be safely backed into the same vec4.
|
|
*/
|
|
unsigned
|
|
varying_matches::compute_packing_class(ir_variable *var)
|
|
{
|
|
/* Without help from the back-end, there is no way to pack together
|
|
* variables with different interpolation types, because
|
|
* lower_packed_varyings must choose exactly one interpolation type for
|
|
* each packed varying it creates.
|
|
*
|
|
* However, we can safely pack together floats, ints, and uints, because:
|
|
*
|
|
* - varyings of base type "int" and "uint" must use the "flat"
|
|
* interpolation type, which can only occur in GLSL 1.30 and above.
|
|
*
|
|
* - On platforms that support GLSL 1.30 and above, lower_packed_varyings
|
|
* can store flat floats as ints without losing any information (using
|
|
* the ir_unop_bitcast_* opcodes).
|
|
*
|
|
* Therefore, the packing class depends only on the interpolation type.
|
|
*/
|
|
unsigned packing_class = var->centroid ? 1 : 0;
|
|
packing_class *= 4;
|
|
packing_class += var->interpolation;
|
|
return packing_class;
|
|
}
|
|
|
|
|
|
/**
|
|
* Compute the "packing order" of the given varying. This is a sort key we
|
|
* use to determine when to attempt to pack the given varying relative to
|
|
* other varyings in the same packing class.
|
|
*/
|
|
varying_matches::packing_order_enum
|
|
varying_matches::compute_packing_order(ir_variable *var)
|
|
{
|
|
const glsl_type *element_type = var->type;
|
|
|
|
while (element_type->base_type == GLSL_TYPE_ARRAY) {
|
|
element_type = element_type->fields.array;
|
|
}
|
|
|
|
switch (element_type->component_slots() % 4) {
|
|
case 1: return PACKING_ORDER_SCALAR;
|
|
case 2: return PACKING_ORDER_VEC2;
|
|
case 3: return PACKING_ORDER_VEC3;
|
|
case 0: return PACKING_ORDER_VEC4;
|
|
default:
|
|
assert(!"Unexpected value of vector_elements");
|
|
return PACKING_ORDER_VEC4;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Comparison function passed to qsort() to sort varyings by packing_class and
|
|
* then by packing_order.
|
|
*/
|
|
int
|
|
varying_matches::match_comparator(const void *x_generic, const void *y_generic)
|
|
{
|
|
const match *x = (const match *) x_generic;
|
|
const match *y = (const match *) y_generic;
|
|
|
|
if (x->packing_class != y->packing_class)
|
|
return x->packing_class - y->packing_class;
|
|
return x->packing_order - y->packing_order;
|
|
}
|
|
|
|
|
|
/**
|
|
* Is the given variable a varying variable to be counted against the
|
|
* limit in ctx->Const.MaxVarying?
|
|
* This includes variables such as texcoords, colors and generic
|
|
* varyings, but excludes variables such as gl_FrontFacing and gl_FragCoord.
|
|
*/
|
|
static bool
|
|
is_varying_var(GLenum shaderType, const ir_variable *var)
|
|
{
|
|
/* Only fragment shaders will take a varying variable as an input */
|
|
if (shaderType == GL_FRAGMENT_SHADER &&
|
|
var->mode == ir_var_shader_in) {
|
|
switch (var->location) {
|
|
case VARYING_SLOT_POS:
|
|
case VARYING_SLOT_FACE:
|
|
case VARYING_SLOT_PNTC:
|
|
return false;
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* Visitor class that generates tfeedback_candidate structs describing all
|
|
* possible targets of transform feedback.
|
|
*
|
|
* tfeedback_candidate structs are stored in the hash table
|
|
* tfeedback_candidates, which is passed to the constructor. This hash table
|
|
* maps varying names to instances of the tfeedback_candidate struct.
|
|
*/
|
|
class tfeedback_candidate_generator : public program_resource_visitor
|
|
{
|
|
public:
|
|
tfeedback_candidate_generator(void *mem_ctx,
|
|
hash_table *tfeedback_candidates)
|
|
: mem_ctx(mem_ctx),
|
|
tfeedback_candidates(tfeedback_candidates),
|
|
toplevel_var(NULL),
|
|
varying_floats(0)
|
|
{
|
|
}
|
|
|
|
void process(ir_variable *var)
|
|
{
|
|
this->toplevel_var = var;
|
|
this->varying_floats = 0;
|
|
if (var->is_interface_instance())
|
|
program_resource_visitor::process(var->interface_type,
|
|
var->interface_type->name);
|
|
else
|
|
program_resource_visitor::process(var);
|
|
}
|
|
|
|
private:
|
|
virtual void visit_field(const glsl_type *type, const char *name,
|
|
bool row_major)
|
|
{
|
|
assert(!type->is_record());
|
|
assert(!(type->is_array() && type->fields.array->is_record()));
|
|
assert(!type->is_interface());
|
|
assert(!(type->is_array() && type->fields.array->is_interface()));
|
|
|
|
(void) row_major;
|
|
|
|
tfeedback_candidate *candidate
|
|
= rzalloc(this->mem_ctx, tfeedback_candidate);
|
|
candidate->toplevel_var = this->toplevel_var;
|
|
candidate->type = type;
|
|
candidate->offset = this->varying_floats;
|
|
hash_table_insert(this->tfeedback_candidates, candidate,
|
|
ralloc_strdup(this->mem_ctx, name));
|
|
this->varying_floats += type->component_slots();
|
|
}
|
|
|
|
/**
|
|
* Memory context used to allocate hash table keys and values.
|
|
*/
|
|
void * const mem_ctx;
|
|
|
|
/**
|
|
* Hash table in which tfeedback_candidate objects should be stored.
|
|
*/
|
|
hash_table * const tfeedback_candidates;
|
|
|
|
/**
|
|
* Pointer to the toplevel variable that is being traversed.
|
|
*/
|
|
ir_variable *toplevel_var;
|
|
|
|
/**
|
|
* Total number of varying floats that have been visited so far. This is
|
|
* used to determine the offset to each varying within the toplevel
|
|
* variable.
|
|
*/
|
|
unsigned varying_floats;
|
|
};
|
|
|
|
|
|
/**
|
|
* Assign locations for all variables that are produced in one pipeline stage
|
|
* (the "producer") and consumed in the next stage (the "consumer").
|
|
*
|
|
* Variables produced by the producer may also be consumed by transform
|
|
* feedback.
|
|
*
|
|
* \param num_tfeedback_decls is the number of declarations indicating
|
|
* variables that may be consumed by transform feedback.
|
|
*
|
|
* \param tfeedback_decls is a pointer to an array of tfeedback_decl objects
|
|
* representing the result of parsing the strings passed to
|
|
* glTransformFeedbackVaryings(). assign_location() will be called for
|
|
* each of these objects that matches one of the outputs of the
|
|
* producer.
|
|
*
|
|
* When num_tfeedback_decls is nonzero, it is permissible for the consumer to
|
|
* be NULL. In this case, varying locations are assigned solely based on the
|
|
* requirements of transform feedback.
|
|
*/
|
|
bool
|
|
assign_varying_locations(struct gl_context *ctx,
|
|
void *mem_ctx,
|
|
struct gl_shader_program *prog,
|
|
gl_shader *producer, gl_shader *consumer,
|
|
unsigned num_tfeedback_decls,
|
|
tfeedback_decl *tfeedback_decls)
|
|
{
|
|
const unsigned producer_base = VARYING_SLOT_VAR0;
|
|
const unsigned consumer_base = VARYING_SLOT_VAR0;
|
|
varying_matches matches(ctx->Const.DisableVaryingPacking,
|
|
consumer && consumer->Type == GL_FRAGMENT_SHADER);
|
|
hash_table *tfeedback_candidates
|
|
= hash_table_ctor(0, hash_table_string_hash, hash_table_string_compare);
|
|
hash_table *consumer_inputs
|
|
= hash_table_ctor(0, hash_table_string_hash, hash_table_string_compare);
|
|
hash_table *consumer_interface_inputs
|
|
= hash_table_ctor(0, hash_table_string_hash, hash_table_string_compare);
|
|
|
|
/* Operate in a total of three passes.
|
|
*
|
|
* 1. Assign locations for any matching inputs and outputs.
|
|
*
|
|
* 2. Mark output variables in the producer that do not have locations as
|
|
* not being outputs. This lets the optimizer eliminate them.
|
|
*
|
|
* 3. Mark input variables in the consumer that do not have locations as
|
|
* not being inputs. This lets the optimizer eliminate them.
|
|
*/
|
|
|
|
if (consumer) {
|
|
foreach_list(node, consumer->ir) {
|
|
ir_variable *const input_var =
|
|
((ir_instruction *) node)->as_variable();
|
|
|
|
if ((input_var != NULL) && (input_var->mode == ir_var_shader_in)) {
|
|
if (input_var->interface_type != NULL) {
|
|
char *const iface_field_name =
|
|
ralloc_asprintf(mem_ctx, "%s.%s",
|
|
input_var->interface_type->name,
|
|
input_var->name);
|
|
hash_table_insert(consumer_interface_inputs, input_var,
|
|
iface_field_name);
|
|
} else {
|
|
hash_table_insert(consumer_inputs, input_var,
|
|
ralloc_strdup(mem_ctx, input_var->name));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
foreach_list(node, producer->ir) {
|
|
ir_variable *const output_var = ((ir_instruction *) node)->as_variable();
|
|
|
|
if ((output_var == NULL) || (output_var->mode != ir_var_shader_out))
|
|
continue;
|
|
|
|
tfeedback_candidate_generator g(mem_ctx, tfeedback_candidates);
|
|
g.process(output_var);
|
|
|
|
ir_variable *input_var;
|
|
if (output_var->interface_type != NULL) {
|
|
char *const iface_field_name =
|
|
ralloc_asprintf(mem_ctx, "%s.%s",
|
|
output_var->interface_type->name,
|
|
output_var->name);
|
|
input_var =
|
|
(ir_variable *) hash_table_find(consumer_interface_inputs,
|
|
iface_field_name);
|
|
} else {
|
|
input_var =
|
|
(ir_variable *) hash_table_find(consumer_inputs, output_var->name);
|
|
}
|
|
|
|
if (input_var && input_var->mode != ir_var_shader_in)
|
|
input_var = NULL;
|
|
|
|
if (input_var) {
|
|
matches.record(output_var, input_var);
|
|
}
|
|
}
|
|
|
|
for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
|
|
if (!tfeedback_decls[i].is_varying())
|
|
continue;
|
|
|
|
const tfeedback_candidate *matched_candidate
|
|
= tfeedback_decls[i].find_candidate(prog, tfeedback_candidates);
|
|
|
|
if (matched_candidate == NULL) {
|
|
hash_table_dtor(tfeedback_candidates);
|
|
hash_table_dtor(consumer_inputs);
|
|
hash_table_dtor(consumer_interface_inputs);
|
|
return false;
|
|
}
|
|
|
|
if (matched_candidate->toplevel_var->is_unmatched_generic_inout)
|
|
matches.record(matched_candidate->toplevel_var, NULL);
|
|
}
|
|
|
|
const unsigned slots_used = matches.assign_locations();
|
|
matches.store_locations(producer_base, consumer_base);
|
|
|
|
for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
|
|
if (!tfeedback_decls[i].is_varying())
|
|
continue;
|
|
|
|
if (!tfeedback_decls[i].assign_location(ctx, prog)) {
|
|
hash_table_dtor(tfeedback_candidates);
|
|
hash_table_dtor(consumer_inputs);
|
|
hash_table_dtor(consumer_interface_inputs);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
hash_table_dtor(tfeedback_candidates);
|
|
hash_table_dtor(consumer_inputs);
|
|
hash_table_dtor(consumer_interface_inputs);
|
|
|
|
if (ctx->Const.DisableVaryingPacking) {
|
|
/* Transform feedback code assumes varyings are packed, so if the driver
|
|
* has disabled varying packing, make sure it does not support transform
|
|
* feedback.
|
|
*/
|
|
assert(!ctx->Extensions.EXT_transform_feedback);
|
|
} else {
|
|
lower_packed_varyings(mem_ctx, producer_base, slots_used,
|
|
ir_var_shader_out, producer);
|
|
if (consumer) {
|
|
lower_packed_varyings(mem_ctx, consumer_base, slots_used,
|
|
ir_var_shader_in, consumer);
|
|
}
|
|
}
|
|
|
|
if (consumer) {
|
|
foreach_list(node, consumer->ir) {
|
|
ir_variable *const var = ((ir_instruction *) node)->as_variable();
|
|
|
|
if (var && var->mode == ir_var_shader_in &&
|
|
var->is_unmatched_generic_inout) {
|
|
if (prog->Version <= 120) {
|
|
/* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
|
|
*
|
|
* Only those varying variables used (i.e. read) in
|
|
* the fragment shader executable must be written to
|
|
* by the vertex shader executable; declaring
|
|
* superfluous varying variables in a vertex shader is
|
|
* permissible.
|
|
*
|
|
* We interpret this text as meaning that the VS must
|
|
* write the variable for the FS to read it. See
|
|
* "glsl1-varying read but not written" in piglit.
|
|
*/
|
|
|
|
linker_error(prog, "%s shader varying %s not written "
|
|
"by %s shader\n.",
|
|
_mesa_glsl_shader_target_name(consumer->Type),
|
|
var->name,
|
|
_mesa_glsl_shader_target_name(producer->Type));
|
|
}
|
|
|
|
/* An 'in' variable is only really a shader input if its
|
|
* value is written by the previous stage.
|
|
*/
|
|
var->mode = ir_var_auto;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
check_against_varying_limit(struct gl_context *ctx,
|
|
struct gl_shader_program *prog,
|
|
gl_shader *consumer)
|
|
{
|
|
unsigned varying_vectors = 0;
|
|
|
|
foreach_list(node, consumer->ir) {
|
|
ir_variable *const var = ((ir_instruction *) node)->as_variable();
|
|
|
|
if (var && var->mode == ir_var_shader_in &&
|
|
is_varying_var(consumer->Type, var)) {
|
|
/* The packing rules used for vertex shader inputs are also
|
|
* used for fragment shader inputs.
|
|
*/
|
|
varying_vectors += count_attribute_slots(var->type);
|
|
}
|
|
}
|
|
|
|
if (ctx->API == API_OPENGLES2 || prog->IsES) {
|
|
if (varying_vectors > ctx->Const.MaxVarying) {
|
|
linker_error(prog, "shader uses too many varying vectors "
|
|
"(%u > %u)\n",
|
|
varying_vectors, ctx->Const.MaxVarying);
|
|
return false;
|
|
}
|
|
} else {
|
|
const unsigned float_components = varying_vectors * 4;
|
|
if (float_components > ctx->Const.MaxVarying * 4) {
|
|
linker_error(prog, "shader uses too many varying components "
|
|
"(%u > %u)\n",
|
|
float_components, ctx->Const.MaxVarying * 4);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|