Add sampler precision to GrTextureAccess

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 186 matching lines @@
 
 static inline bool GrSLTypeIsSamplerType(GrSLType type) {
     SkASSERT(type >= 0 && type < static_cast<GrSLType>(kGrSLTypeCount));
     return type >= kSampler2D_GrSLType && type <= kSampler2DRect_GrSLType;
 
     GR_STATIC_ASSERT(8 == kSampler2D_GrSLType);
     GR_STATIC_ASSERT(9 == kSamplerExternal_GrSLType);
     GR_STATIC_ASSERT(10 == kSampler2DRect_GrSLType);
 }
 
+static inline bool GrSLTypeAcceptsPrecision(GrSLType type) {
+    return GrSLTypeIsNumeric(type) || GrSLTypeIsSamplerType(type);
+}
+
 //////////////////////////////////////////////////////////////////////////////
 
 /**
  * Types used to describe format of vertices in arrays.
   */
 enum GrVertexAttribType {
     kFloat_GrVertexAttribType = 0,
     kVec2f_GrVertexAttribType,
     kVec3f_GrVertexAttribType,
     kVec4f_GrVertexAttribType,
@@ skipping 194 matching lines @@
 // Takes a pointer to a GrCaps, and will suppress prints if required
 #define GrCapsDebugf(caps, ...)         \
     if (!caps->suppressPrints()) {      \
         SkDebugf(__VA_ARGS__);          \
     }
 #else
 #define GrCapsDebugf(caps, ...)
 #endif
 
 #endif