Move shader precision out of GrShaderVar

include/gpu/GrTypesPriv.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTypesPriv_DEFINED
 #define GrTypesPriv_DEFINED
 
@@ skipping 21 matching lines @@
 enum GrShaderType {
     kVertex_GrShaderType,
     kGeometry_GrShaderType,
     kFragment_GrShaderType,
 
     kLastkFragment_GrShaderType = kFragment_GrShaderType
 };
 static const int kGrShaderTypeCount = kLastkFragment_GrShaderType + 1;
 
 /**
+ * Precisions of shader language variables. Not all shading languages support precisions or actually
+ * vary the internal precision based on the qualifiers.
+ */
+enum GrSLPrecision {
+    kLow_GrSLPrecision,
+    kMedium_GrSLPrecision,
+    kHigh_GrSLPrecision,
+
+    // Default precision is medium. This is because on OpenGL ES 2 highp support is not
+    // guaranteed. On (non-ES) OpenGL the specifiers have no effect on precision.
+    kDefault_GrSLPrecision = kMedium_GrSLPrecision,
+
+    kLast_GrSLPrecision = kHigh_GrSLPrecision
+};
+
+static const int kGrSLPrecisionCount = kLast_GrSLPrecision + 1;
+
+/**
  * Gets the vector size of the SLType. Returns -1 for void, matrices, and samplers.
  */
 static inline int GrSLTypeVectorCount(GrSLType type) {
     SkASSERT(type >= 0 && type < static_cast<GrSLType>(kGrSLTypeCount));
     static const int kCounts[] = { -1, 1, 2, 3, 4, -1, -1, -1 };
     return kCounts[type];
 
     GR_STATIC_ASSERT(0 == kVoid_GrSLType);
     GR_STATIC_ASSERT(1 == kFloat_GrSLType);
     GR_STATIC_ASSERT(2 == kVec2f_GrSLType);
@@ skipping 148 matching lines @@
 /**
  * Indicates the type of pending IO operations that can be recorded for gpu resources.
  */
 enum GrIOType {
     kRead_GrIOType,
     kWrite_GrIOType,
     kRW_GrIOType
 };
 
 #endif