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radeonsi: handle ignored LAYER and VIEWPORT_INDEX writes

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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
This commit is contained in:
Nicolai Hähnle 2017-04-13 22:14:20 +02:00
parent 4127f38bae
commit d5e53f348e
1 changed files with 20 additions and 0 deletions
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20
src/gallium/drivers/radeonsi/si_shader.c
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@ -2686,6 +2686,26 @@ static void si_llvm_emit_ls_epilogue(struct lp_build_tgsi_context *bld_base)
LLVMValueRef *out_ptr = ctx->outputs[i];
unsigned name = info->output_semantic_name[i];
unsigned index = info->output_semantic_index[i];
/* The ARB_shader_viewport_layer_array spec contains the
* following issue:
*
* 2) What happens if gl_ViewportIndex or gl_Layer is
* written in the vertex shader and a geometry shader is
* present?
*
* RESOLVED: The value written by the last vertex processing
* stage is used. If the last vertex processing stage
* (vertex, tessellation evaluation or geometry) does not
* statically assign to gl_ViewportIndex or gl_Layer, index
* or layer zero is assumed.
*
* So writes to those outputs in VS-as-LS are simply ignored.
*/
if (name == TGSI_SEMANTIC_LAYER ||
name == TGSI_SEMANTIC_VIEWPORT_INDEX)
continue;
int param = si_shader_io_get_unique_index(name, index);
LLVMValueRef dw_addr = LLVMBuildAdd(gallivm->builder, base_dw_addr,
LLVMConstInt(ctx->i32, param * 4, 0), "");