diff options
Diffstat (limited to 'src/glsl/builtin_variables.cpp')
| -rw-r--r-- | src/glsl/builtin_variables.cpp | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp index 3e7a84521e9..cc423383df8 100644 --- a/src/glsl/builtin_variables.cpp +++ b/src/glsl/builtin_variables.cpp @@ -690,6 +690,26 @@ builtin_variable_generator::generate_constants() state->Const.MaxComputeWorkGroupSize[0], state->Const.MaxComputeWorkGroupSize[1], state->Const.MaxComputeWorkGroupSize[2]); + + /* From the GLSL 4.40 spec, section 7.1 (Built-In Language Variables): + * + * The built-in constant gl_WorkGroupSize is a compute-shader + * constant containing the local work-group size of the shader. The + * size of the work group in the X, Y, and Z dimensions is stored in + * the x, y, and z components. The constants values in + * gl_WorkGroupSize will match those specified in the required + * local_size_x, local_size_y, and local_size_z layout qualifiers + * for the current shader. This is a constant so that it can be + * used to size arrays of memory that can be shared within the local + * work group. It is a compile-time error to use gl_WorkGroupSize + * in a shader that does not declare a fixed local group size, or + * before that shader has declared a fixed local group size, using + * local_size_x, local_size_y, and local_size_z. + * + * To prevent the shader from trying to refer to gl_WorkGroupSize before + * the layout declaration, we don't define it here. Intead we define it + * in ast_cs_input_layout::hir(). + */ } } |