diff options
Diffstat (limited to 'src/gallium/drivers/radeonsi/si_shader.c')
| -rw-r--r-- | src/gallium/drivers/radeonsi/si_shader.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c index 0bda187cfd2..00264b57963 100644 --- a/src/gallium/drivers/radeonsi/si_shader.c +++ b/src/gallium/drivers/radeonsi/si_shader.c @@ -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), ""); |