added support for PLS path rendering

src/gpu/glsl/GrGLSLShaderVar.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLSLShaderVar_DEFINED
 #define GrGLSLShaderVar_DEFINED
 
@@ skipping 55 matching lines @@
     /**
      * Sets as a non-array.
      */
     void set(GrSLType type,
              TypeModifier typeModifier,
              const SkString& name,
              GrSLPrecision precision = kDefault_GrSLPrecision,
              const char* layoutQualifier = nullptr,
              bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
         SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
+        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         INHERITED::set(type, name, typeModifier, precision);
         fLayoutQualifier = layoutQualifier;
         fUseUniformFloatArrays = useUniformFloatArrays;
     }
 
     /**
      * Sets as a non-array.
      */
     void set(GrSLType type,
              TypeModifier typeModifier,
              const char* name,
              GrSLPrecision precision = kDefault_GrSLPrecision,
              const char* layoutQualifier = nullptr,
              bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
         SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
+        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         INHERITED::set(type, name, typeModifier, precision);
         fLayoutQualifier = layoutQualifier;
         fUseUniformFloatArrays = useUniformFloatArrays;
     }
 
     /**
      * Set all var options
      */
     void set(GrSLType type,
              TypeModifier typeModifier,
              const SkString& name,
              int count,
              GrSLPrecision precision = kDefault_GrSLPrecision,
              const char* layoutQualifier = nullptr,
              bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
         SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
+        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         INHERITED::set(type, name, typeModifier, precision, count);
         fLayoutQualifier = layoutQualifier;
         fUseUniformFloatArrays = useUniformFloatArrays;
     }
 
     /**
      * Set all var options
      */
     void set(GrSLType type,
              TypeModifier typeModifier,
              const char* name,
              int count,
              GrSLPrecision precision = kDefault_GrSLPrecision,
              const char* layoutQualifier = nullptr,
              bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
         SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
+        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsNumeric(type));
         INHERITED::set(type, name, typeModifier, precision, count);
         fLayoutQualifier = layoutQualifier;
         fUseUniformFloatArrays = useUniformFloatArrays;
     }
 
     /**
      * Set the layout qualifier
      */
     void setLayoutQualifier(const char* layoutQualifier) {
         fLayoutQualifier = layoutQualifier;
     }
 
     /**
      * Write a declaration of this variable to out.
      */
     void appendDecl(const GrGLSLCaps* glslCaps, SkString* out) const {
-        SkASSERT(kDefault_GrSLPrecision == fPrecision || GrSLTypeIsFloatType(fType));
+        SkASSERT(kDefault_GrSLPrecision == fPrecision || GrSLTypeIsNumeric(fType));
         if (!fLayoutQualifier.isEmpty()) {
             out->appendf("layout(%s) ", fLayoutQualifier.c_str());
         }
         if (this->getTypeModifier() != kNone_TypeModifier) {
-           out->append(TypeModifierString(glslCaps, this->getTypeModifier()));
-           out->append(" ");
+            if (GrSLTypeIsIntType(fType) && (this->getTypeModifier() == kVaryingIn_TypeModifier ||
+                                             this->getTypeModifier() == kVaryingOut_TypeModifier)) {
+                out->append("flat ");
+            }
+            out->append(TypeModifierString(glslCaps, this->getTypeModifier()));
+            out->append(" ");
         }
-        out->append(PrecisionString(glslCaps, fPrecision));
         GrSLType effectiveType = this->getType();
+        if (effectiveType != kBool_GrSLType) {
+            out->append(PrecisionString(glslCaps, fPrecision));
+        }
         if (this->isArray()) {
             if (this->isUnsizedArray()) {
                 out->appendf("%s %s[]",
                              GrGLSLTypeString(effectiveType),
                              this->getName().c_str());
             } else {
                 SkASSERT(this->getArrayCount() > 0);
                 out->appendf("%s %s[%d]",
                              GrGLSLTypeString(effectiveType),
                              this->getName().c_str(),
@@ skipping 66 matching lines @@
     /// Work around driver bugs on some hardware that don't correctly
     /// support uniform float []
     bool            fUseUniformFloatArrays;
 
     SkString        fLayoutQualifier;
 
     typedef GrShaderVar INHERITED;
 };
 
 #endif