Mesa (master): intel/compiler: Add a uses_firstvertex flag

[Ian Romanick]

Module: Mesa
Branch: master
Commit: 0c8395e15d295d328f68574e71afaf04596e2a82
URL:    
http://cgit.freedesktop.org/mesa/mesa/commit/?id=0c8395e15d295d328f68574e71afaf04596e2a82

Author: Neil Roberts <nrobe...@igalia.com>
Date:   Thu Jan 25 19:15:39 2018 +0100

intel/compiler: Add a uses_firstvertex flag

Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>

---

 src/intel/compiler/brw_compiler.h | 1 +
 src/intel/compiler/brw_vec4.cpp   | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/src/intel/compiler/brw_compiler.h 
b/src/intel/compiler/brw_compiler.h
index 875b2936fd..24196248b8 100644
--- a/src/intel/compiler/brw_compiler.h
+++ b/src/intel/compiler/brw_compiler.h
@@ -978,6 +978,7 @@ struct brw_vs_prog_data {
    bool uses_vertexid;
    bool uses_instanceid;
    bool uses_basevertex;
+   bool uses_firstvertex;
    bool uses_baseinstance;
    bool uses_drawid;
 };
diff --git a/src/intel/compiler/brw_vec4.cpp b/src/intel/compiler/brw_vec4.cpp
index 218925ccb1..9459d61af6 100644
--- a/src/intel/compiler/brw_vec4.cpp
+++ b/src/intel/compiler/brw_vec4.cpp
@@ -2837,6 +2837,10 @@ brw_compile_vs(const struct brw_compiler *compiler, void 
*log_data,
       prog_data->uses_basevertex = true;
 
    if (shader->info.system_values_read &
+       BITFIELD64_BIT(SYSTEM_VALUE_FIRST_VERTEX))
+      prog_data->uses_firstvertex = true;
+
+   if (shader->info.system_values_read &
        BITFIELD64_BIT(SYSTEM_VALUE_BASE_INSTANCE))
       prog_data->uses_baseinstance = true;
 

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