From: Nicolai Hähnle <nicolai.haehnle@amd.com>
Date: Fri, 18 Nov 2016 19:51:56 +0000 (+0100)
Subject: st/mesa: skip lower_output_reads when possible
X-Git-Tag: upstream/17.1.0~4197
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f60374aa689539c8dbdb851488be515e5e7df7cb;p=platform%2Fupstream%2Fmesa.git

st/mesa: skip lower_output_reads when possible

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

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);