From fa5a66f192f8221c7e69768b17cfbc6075f91e83 Mon Sep 17 00:00:00 2001
From: dan sinclair <dsinclair@chromium.org>
Date: Mon, 20 Apr 2020 15:48:03 +0000
Subject: [PATCH] Add GLSL Trunc support.

This CL adds type determination for the Trunc method.

Bug: tint:5
Change-Id: I4f23dad7725f1f076fbbc7da8687de42a02cc482
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/19941
Reviewed-by: David Neto <dneto@google.com>
---
 src/type_determiner.cc      | 5 ++++-
 src/type_determiner_test.cc | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/type_determiner.cc b/src/type_determiner.cc
index ad6f9c40d8..3115e7cd94 100644
--- a/src/type_determiner.cc
+++ b/src/type_determiner.cc
@@ -576,7 +576,7 @@ ast::type::Type* TypeDeterminer::GetImportData(
     return nullptr;
   }
 
-  if (name == "round" || name == "roundeven") {
+  if (name == "round" || name == "roundeven" || name == "trunc") {
     if (params.size() != 1) {
       error_ = "incorrect number of parameters for " + name +
                ". Expected 1 got " + std::to_string(params.size());
@@ -592,7 +592,10 @@ ast::type::Type* TypeDeterminer::GetImportData(
       *id = GLSLstd450Round;
     } else if (name == "roundeven") {
       *id = GLSLstd450RoundEven;
+    } else if (name == "trunc") {
+      *id = GLSLstd450Trunc;
     }
+
     return params[0]->result_type();
   }
 
diff --git a/src/type_determiner_test.cc b/src/type_determiner_test.cc
index bebeae49a1..f3a2b893db 100644
--- a/src/type_determiner_test.cc
+++ b/src/type_determiner_test.cc
@@ -1589,7 +1589,8 @@ INSTANTIATE_TEST_SUITE_P(TypeDeterminerTest,
                          ImportData_FloatTest,
                          testing::Values(GLSLData{"round", GLSLstd450Round},
                                          GLSLData{"roundeven",
-                                                  GLSLstd450RoundEven}));
+                                                  GLSLstd450RoundEven},
+                                         GLSLData{"trunc", GLSLstd450Trunc}));
 
 }  // namespace
 }  // namespace tint