fixed constant vector swizzling

Bug: skia:
Change-Id: I2d205bf7242d2223c4939c3e7897db9aba02c705
Reviewed-on: https://skia-review.googlesource.com/35640
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/sksl/ir/SkSLConstructor.h b/src/sksl/ir/SkSLConstructor.h
index 8f963e68eb..51af1c1132 100644
--- a/src/sksl/ir/SkSLConstructor.h
+++ b/src/sksl/ir/SkSLConstructor.h
@@ -50,6 +50,17 @@ struct Constructor : public Expression {
                                                                   &fType));
             }
         }
+        if (fArguments.size() == 1 && fArguments[0]->fKind == Expression::kFloatLiteral_Kind) {
+            if (fType == *irGenerator.fContext.fFloat_Type ||
+                fType == *irGenerator.fContext.fHalf_Type) {
+                // convert float(1.0) to 1.0
+                double floatValue = ((FloatLiteral&) *fArguments[0]).fValue;
+                return std::unique_ptr<Expression>(new FloatLiteral(irGenerator.fContext,
+                                                                    fPosition,
+                                                                    floatValue,
+                                                                    &fType));
+            }
+        }
         return nullptr;
     }