diff options
author | Kenneth Graunke <[email protected]> | 2015-07-28 18:16:37 -0700 |
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committer | Kenneth Graunke <[email protected]> | 2015-10-26 16:37:07 -0700 |
commit | 8034e7d6f1be3c9c1a9626b64830617ccf000ecc (patch) | |
tree | 0eed5c2ba83b9b0a66d25511c15c18534e85f7e7 /src/glsl/linker.cpp | |
parent | 8f84a8e257291168ec4b394b1eaa6acef1538cea (diff) |
glsl: Convert TES gl_PatchVerticesIn into a constant when using a TCS.
When a TCS is present, the TES input gl_PatchVerticesIn is actually a
constant - it's simply the # of output vertices specified by the TCS
layout qualifiers. So, we can replace the system value with a constant,
which may allow further optimization, and will likely be more efficient.
If the TCS is absent, we can't do this optimization.
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Diffstat (limited to 'src/glsl/linker.cpp')
-rw-r--r-- | src/glsl/linker.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp index 424b92a1783..cfd8f81c867 100644 --- a/src/glsl/linker.cpp +++ b/src/glsl/linker.cpp @@ -2282,6 +2282,22 @@ resize_tes_inputs(struct gl_context *ctx, foreach_in_list(ir_instruction, ir, tes->ir) { ir->accept(&input_resize_visitor); } + + if (tcs) { + /* Convert the gl_PatchVerticesIn system value into a constant, since + * the value is known at this point. + */ + foreach_in_list(ir_instruction, ir, tes->ir) { + ir_variable *var = ir->as_variable(); + if (var && var->data.mode == ir_var_system_value && + var->data.location == SYSTEM_VALUE_VERTICES_IN) { + void *mem_ctx = ralloc_parent(var); + var->data.mode = ir_var_auto; + var->data.location = 0; + var->constant_value = new(mem_ctx) ir_constant(num_vertices); + } + } + } } /** |