Mesa (master): st/mesa: skip lower_output_reads when possible

[Nicolai Hähnle]

Module: Mesa
Branch: master
Commit: f60374aa689539c8dbdb851488be515e5e7df7cb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f60374aa689539c8dbdb851488be515e5e7df7cb

Author: Nicolai Hähnle <nicolai.haehnle at amd.com>
Date:   Fri Nov 18 20:51:56 2016 +0100

st/mesa: skip lower_output_reads when possible

Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 8a247ea..7720edf 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -6445,7 +6445,8 @@ get_mesa_program_tgsi(struct gl_context *ctx,
                                                prog->Parameters);
 
    /* Remove reads from output registers. */
-   lower_output_reads(shader->Stage, shader->ir);
+   if (!pscreen->get_param(pscreen, PIPE_CAP_TGSI_CAN_READ_OUTPUTS))
+      lower_output_reads(shader->Stage, shader->ir);
 
    /* Emit intermediate IR for main(). */
    visit_exec_list(shader->ir, v);