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glsl: don't eliminate texcoords that can be set by GL_COORD_REPLACE

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Tested by examining generated TGSI shaders from piglit/glsl-routing.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Henri Verbeet <hverbeet@gmail.com>
Tested-by: Henri Verbeet <hverbeet@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Marek Olšák
2013-08-09 22:34:45 +02:00
parent a8346a2f52
commit d13003f544
3 changed files with 23 additions and 12 deletions
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27
src/glsl/opt_dead_builtin_varyings.cpp
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@@ -409,7 +409,7 @@ lower_texcoord_array(exec_list *ir, const varying_info_visitor *info)
void
do_dead_builtin_varyings(struct gl_context *ctx,
exec_list *producer, exec_list *consumer,
gl_shader *producer, gl_shader *consumer,
unsigned num_tfeedback_decls,
tfeedback_decl *tfeedback_decls)
{
@@ -431,44 +431,55 @@ do_dead_builtin_varyings(struct gl_context *ctx,
varying_info_visitor consumer_info(ir_var_shader_in);
if (producer) {
producer_info.get(producer, num_tfeedback_decls, tfeedback_decls);
producer_info.get(producer->ir, num_tfeedback_decls, tfeedback_decls);
if (!consumer) {
/* At least eliminate unused gl_TexCoord elements. */
if (producer_info.lower_texcoord_array) {
lower_texcoord_array(producer, &producer_info);
lower_texcoord_array(producer->ir, &producer_info);
}
return;
}
}
if (consumer) {
consumer_info.get(consumer, 0, NULL);
consumer_info.get(consumer->ir, 0, NULL);
if (!producer) {
/* At least eliminate unused gl_TexCoord elements. */
if (consumer_info.lower_texcoord_array) {
lower_texcoord_array(consumer, &consumer_info);
lower_texcoord_array(consumer->ir, &consumer_info);
}
return;
}
}
/* Eliminate the varyings unused by the other shader. */
/* Eliminate the outputs unused by the consumer. */
if (producer_info.lower_texcoord_array ||
producer_info.color_usage ||
producer_info.has_fog) {
replace_varyings_visitor(producer,
replace_varyings_visitor(producer->ir,
&producer_info,
consumer_info.texcoord_usage,
consumer_info.color_usage,
consumer_info.has_fog);
}
/* The gl_TexCoord fragment shader inputs can be initialized
* by GL_COORD_REPLACE, so we can't eliminate them.
*
* This doesn't prevent elimination of the gl_TexCoord elements which
* are not read by the fragment shader. We want to eliminate those anyway.
*/
if (consumer->Type == GL_FRAGMENT_SHADER) {
producer_info.texcoord_usage = (1 << MAX_TEXTURE_COORD_UNITS) - 1;
}
/* Eliminate the inputs uninitialized by the producer. */
if (consumer_info.lower_texcoord_array ||
consumer_info.color_usage ||
consumer_info.has_fog) {
replace_varyings_visitor(consumer,
replace_varyings_visitor(consumer->ir,
&consumer_info,
producer_info.texcoord_usage,
producer_info.color_usage,