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glsl/linker: handle errors when a variable local size is used

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Compute shaders can now include a fixed local size as defined by
ARB_compute_shader or a variable size as defined by
ARB_compute_variable_group_size.

v2: - update formatting spec quotations (Ian)
    - various cosmetic changes (Ian)

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Samuel Pitoiset
2016-09-06 22:46:42 +02:00
parent 008e785f74
commit dee627a16e
1 changed files with 23 additions and 2 deletions
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25
src/compiler/glsl/linker.cpp
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@@ -1988,6 +1988,8 @@ link_cs_input_layout_qualifiers(struct gl_shader_program *prog,
for (int i = 0; i < 3; i++)
linked_shader->info.Comp.LocalSize[i] = 0;
linked_shader->info.Comp.LocalSizeVariable = false;
/* This function is called for all shader stages, but it only has an effect
* for compute shaders.
*/
@@ -2022,6 +2024,20 @@ link_cs_input_layout_qualifiers(struct gl_shader_program *prog,
linked_shader->info.Comp.LocalSize[i] =
shader->info.Comp.LocalSize[i];
}
} else if (shader->info.Comp.LocalSizeVariable) {
if (linked_shader->info.Comp.LocalSize[0] != 0) {
/* The ARB_compute_variable_group_size spec says:
*
* If one compute shader attached to a program declares a
* variable local group size and a second compute shader
* attached to the same program declares a fixed local group
* size, a link-time error results.
*/
linker_error(prog, "compute shader defined with both fixed and "
"variable local group size\n");
return;
}
linked_shader->info.Comp.LocalSizeVariable = true;
}
}
@@ -2029,12 +2045,17 @@ link_cs_input_layout_qualifiers(struct gl_shader_program *prog,
* since we already know we're in the right type of shader program
* for doing it.
*/
if (linked_shader->info.Comp.LocalSize[0] == 0) {
linker_error(prog, "compute shader didn't declare local size\n");
if (linked_shader->info.Comp.LocalSize[0] == 0 &&
!linked_shader->info.Comp.LocalSizeVariable) {
linker_error(prog, "compute shader must contain a fixed or a variable "
"local group size\n");
return;
}
for (int i = 0; i < 3; i++)
prog->Comp.LocalSize[i] = linked_shader->info.Comp.LocalSize[i];
prog->Comp.LocalSizeVariable =
linked_shader->info.Comp.LocalSizeVariable;
}