aboutsummaryrefslogtreecommitdiffstats
path: root/src/glsl/linker.cpp
diff options
context:
space:
mode:
authorKenneth Graunke <[email protected]>2015-07-28 18:16:37 -0700
committerKenneth Graunke <[email protected]>2015-10-26 16:37:07 -0700
commit8034e7d6f1be3c9c1a9626b64830617ccf000ecc (patch)
tree0eed5c2ba83b9b0a66d25511c15c18534e85f7e7 /src/glsl/linker.cpp
parent8f84a8e257291168ec4b394b1eaa6acef1538cea (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.cpp16
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);
+ }
+ }
+ }
}
/**