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glsl: simplify disable_varying_optimizations_for_sso

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We always have stage == first and stage == last when first == last, so
drop the special case. Also rephrase the comment to make the logic
clearer.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Nicolai Hähnle
2017-06-11 12:48:52 +02:00
parent 141d0831ff
commit da506cce8a
1 changed files with 11 additions and 18 deletions
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29
src/compiler/glsl/linker.cpp
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@@ -4517,24 +4517,17 @@ disable_varying_optimizations_for_sso(struct gl_shader_program *prog)
if (!sh)
continue;
if (first == last) {
/* For a single shader program only allow inputs to the vertex shader
* and outputs from the fragment shader to be removed.
*/
if (stage != MESA_SHADER_VERTEX)
set_always_active_io(sh->ir, ir_var_shader_in);
if (stage != MESA_SHADER_FRAGMENT)
set_always_active_io(sh->ir, ir_var_shader_out);
} else {
/* For multi-stage separate shader programs only allow inputs and
* outputs between the shader stages to be removed as well as inputs
* to the vertex shader and outputs from the fragment shader.
*/
if (stage == first && stage != MESA_SHADER_VERTEX)
set_always_active_io(sh->ir, ir_var_shader_in);
else if (stage == last && stage != MESA_SHADER_FRAGMENT)
set_always_active_io(sh->ir, ir_var_shader_out);
}
/* Prevent the removal of inputs to the first and outputs from the last
* stage, unless they are the initial pipeline inputs or final pipeline
* outputs, respectively.
*
* The removal of IO between shaders in the same program is always
* allowed.
*/
if (stage == first && stage != MESA_SHADER_VERTEX)
set_always_active_io(sh->ir, ir_var_shader_in);
if (stage == last && stage != MESA_SHADER_FRAGMENT)
set_always_active_io(sh->ir, ir_var_shader_out);
}
}