this is required for Drivers which don't allow reading from outputs.
Reviewed-by: Timothy Arceri <tarc...@itsqueeze.com>
Signed-off-by: Karol Herbst <kher...@redhat.com>
---
src/mesa/state_tracker/st_glsl_to_nir.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/mesa/state_tracker/st_glsl_to_nir.cpp
b/src/mesa/state_tracker/st_glsl_to_nir.cpp
index bcf6a7ceb6a..6502aec370f 100644
--- a/src/mesa/state_tracker/st_glsl_to_nir.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_nir.cpp
@@ -44,6 +44,7 @@
#include "compiler/glsl_types.h"
#include "compiler/glsl/glsl_to_nir.h"
#include "compiler/glsl/ir.h"
+#include "compiler/glsl/ir_optimization.h"
#include "compiler/glsl/string_to_uint_map.h"
@@ -553,6 +554,7 @@ st_nir_get_mesa_program(struct gl_context *ctx,
struct gl_linked_shader *shader)
{
struct st_context *st = st_context(ctx);
+ struct pipe_screen *pscreen = ctx->st->pipe->screen;
struct gl_program *prog;
validate_ir_tree(shader->ir);
@@ -565,6 +567,10 @@ st_nir_get_mesa_program(struct gl_context *ctx,
_mesa_generate_parameters_list_for_uniforms(ctx, shader_program, shader,
prog->Parameters);
+ /* Remove reads from output registers. */
+ if (!pscreen->get_param(pscreen, PIPE_CAP_TGSI_CAN_READ_OUTPUTS))
+ lower_output_reads(shader->Stage, shader->ir);
+
if (ctx->_Shader->Flags & GLSL_DUMP) {
_mesa_log("\n");
_mesa_log("GLSL IR for linked %s program %d:\n",
--
2.14.3
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