mesa/glsl: new compiler option EmitNoIndirectSampler
Patch provides new compiler option for backend to force unroll loops that have non-constant expression indexing on sampler arrays. This makes sure that we can never end up with a shader that uses loop induction variable as sampler array index but does not unroll because of having too much instructions. This would not work without dynamic indexing support. v2: change option name as EmitNoIndirectSampler Signed-off-by: Tapani Pälli <tapani.palli@intel.com> Reviewed-by: Francisco Jerez <currojerez@riseup.net> Cc: "10.5" and "10.6" <mesa-stable@lists.freedesktop.org>
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@ -100,6 +100,18 @@ public:
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virtual ir_visitor_status visit_enter(ir_dereference_array *ir)
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{
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/* Force unroll in case of dynamic indexing with sampler arrays
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* when EmitNoIndirectSampler is set.
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*/
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if (options->EmitNoIndirectSampler) {
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if ((ir->array->type->is_array() &&
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ir->array->type->contains_sampler()) &&
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!ir->array_index->constant_expression_value()) {
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unsupported_variable_indexing = true;
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return visit_continue;
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}
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}
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/* Check for arrays variably-indexed by a loop induction variable.
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* Unrolling the loop may convert that access into constant-indexing.
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*
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@ -2881,6 +2881,7 @@ struct gl_shader_compiler_options
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GLboolean EmitNoIndirectOutput; /**< No indirect addressing of outputs */
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GLboolean EmitNoIndirectTemp; /**< No indirect addressing of temps */
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GLboolean EmitNoIndirectUniform; /**< No indirect addressing of constants */
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GLboolean EmitNoIndirectSampler; /**< No indirect addressing of samplers */
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/*@}*/
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GLuint MaxIfDepth; /**< Maximum nested IF blocks */
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