commit 84aa2dcf8a2de29f374177120f3b61bd6223c828
author Martin Radev <mradev@nvidia.com> Mon Sep 11 15:51:02 2017 +0300
committer Commit Bot <commit-bot@chromium.org> Tue Sep 19 23:18:38 2017 +0000
tree 58dbcffb26fd100dd99f292444359775a193636b
parent 72f58fa30559ff9f8444e1d6c3fd32e1112c6648

Add textureGather and textureGatherOffset

The patch adds new built-ins and extends the semantic parser to add
support for textureGather and textureGatherOffset.

BUG=angleproject:1442
TEST=angle_unittests
TEST=angle_deqp_gles31_tests.exe
     --deqp-case=dEQP-GLES31.functional.texture.gather*
     --deqp-egl-display-type=angle-gl

Change-Id: Iaf98c3420fbd61193072fdec8f5a61ac4c574101
Reviewed-on: https://chromium-review.googlesource.com/660124
Commit-Queue: Martin Radev <mradev@nvidia.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

src/compiler/translator/ShaderLang.cpp

diff --git a/src/compiler/translator/ShaderLang.cpp b/src/compiler/translator/ShaderLang.cpp
index 75e5490..003c40f 100644
--- a/src/compiler/translator/ShaderLang.cpp
+++ b/src/compiler/translator/ShaderLang.cpp
@@ -202,6 +202,14 @@
     resources->MaxFunctionParameters   = 1024;
 
     // ES 3.1 Revision 4, 7.2 Built-in Constants
+
+    // ES 3.1, Revision 4, 8.13 Texture minification
+    // "The value of MIN_PROGRAM_TEXTURE_GATHER_OFFSET must be less than or equal to the value of
+    // MIN_PROGRAM_TEXEL_OFFSET. The value of MAX_PROGRAM_TEXTURE_GATHER_OFFSET must be greater than
+    // or equal to the value of MAX_PROGRAM_TEXEL_OFFSET"
+    resources->MinProgramTextureGatherOffset = -8;
+    resources->MaxProgramTextureGatherOffset = 7;
+
     resources->MaxImageUnits            = 4;
     resources->MaxVertexImageUniforms   = 0;
     resources->MaxFragmentImageUniforms = 0;