We lower gl_LocalInvocationIndex based on the extension spec formula:
gl_LocalInvocationIndex =
gl_LocalInvocationID.z * gl_WorkGroupSize.x * gl_WorkGroupSize.y +
gl_LocalInvocationID.y * gl_WorkGroupSize.x +
gl_LocalInvocationID.x;
https://www.opengl.org/registry/specs/ARB/compute_shader.txt
We need to set this variable in main(), even if gl_LocalInvocationIndex
is not referenced by the shader. (It may be used by a linked shader.)
Therefore, we can't eliminate it as a dead variable.
Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
---
git://people.freedesktop.org/~jljusten/mesa cs-local-index-v1
http://patchwork.freedesktop.org/bundle/jljusten/cs-local-index-v1
src/glsl/opt_dead_builtin_variables.cpp | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/glsl/opt_dead_builtin_variables.cpp
b/src/glsl/opt_dead_builtin_variables.cpp
index 90b753e..03e5789 100644
--- a/src/glsl/opt_dead_builtin_variables.cpp
+++ b/src/glsl/opt_dead_builtin_variables.cpp
@@ -72,6 +72,13 @@ optimize_dead_builtin_variables(exec_list *instructions,
* gl_GlobalInvocationID =
* gl_WorkGroupID * gl_WorkGroupSize + gl_LocalInvocationID
*
+ * Similarly, we initialize gl_LocalInvocationIndex in the main function:
+ *
+ * gl_LocalInvocationIndex =
+ * gl_LocalInvocationID.z * gl_WorkGroupSize.x *
gl_WorkGroupSize.y +
+ * gl_LocalInvocationID.y * gl_WorkGroupSize.x +
+ * gl_LocalInvocationID.x;
+ *
* Matrix uniforms with "Transpose" are not eliminated because there's
* an optimization pass that can turn references to the regular matrix
* into references to the transpose matrix. Eliminating the transpose
@@ -87,6 +94,7 @@ optimize_dead_builtin_variables(exec_list *instructions,
|| strcmp(var->name, "gl_WorkGroupSize") == 0
|| strcmp(var->name, "gl_LocalInvocationID") == 0
|| strcmp(var->name, "gl_GlobalInvocationID") == 0
+ || strcmp(var->name, "gl_LocalInvocationIndex") == 0
|| strstr(var->name, "Transpose") != NULL)
continue;
--
2.1.4
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