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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrShaderVar_DEFINED
#define GrShaderVar_DEFINED
#include "GrTypesPriv.h"
#include "SkString.h"
class GrShaderVar {
public:
/**
* Early versions of GLSL have Varying and Attribute; those are later
* deprecated, but we still need to know whether a Varying variable
* should be treated as In or Out.
*
* TODO This really shouldn't live here, but until we have c++11, there is really no good way
* to write extensible enums. In reality, only none, out, in, inout, and uniform really
* make sense on this base class
*/
enum TypeModifier {
kNone_TypeModifier,
kOut_TypeModifier,
kIn_TypeModifier,
kInOut_TypeModifier,
kUniform_TypeModifier,
// GL Specific types below
kAttribute_TypeModifier,
kVaryingIn_TypeModifier,
kVaryingOut_TypeModifier
};
enum Precision {
kLow_Precision, // lowp
kMedium_Precision, // mediump
kHigh_Precision, // highp
kDefault_Precision, // Default for the current context. We make
// fragment shaders default to mediump on ES2
// because highp support is not guaranteed (and
// we haven't been motivated to test for it).
// Otherwise, highp.
};
/**
* Defaults to a float with no precision specifier
*/
GrShaderVar()
: fType(kFloat_GrSLType)
, fTypeModifier(kNone_TypeModifier)
, fCount(kNonArray)
, fPrecision(kDefault_Precision) {
}
GrShaderVar(const SkString& name, GrSLType type, int arrayCount = kNonArray,
Precision precision = kDefault_Precision)
: fType(type)
, fTypeModifier(kNone_TypeModifier)
, fName(name)
, fCount(arrayCount)
, fPrecision(precision) {
SkASSERT(kVoid_GrSLType != type);
}
GrShaderVar(const char* name, GrSLType type, int arrayCount = kNonArray,
Precision precision = kDefault_Precision)
: fType(type)
, fTypeModifier(kNone_TypeModifier)
, fName(name)
, fCount(arrayCount)
, fPrecision(precision) {
SkASSERT(kVoid_GrSLType != type);
}
GrShaderVar(const char* name, GrSLType type, TypeModifier typeModifier,
int arrayCount = kNonArray, Precision precision = kDefault_Precision)
: fType(type)
, fTypeModifier(typeModifier)
, fName(name)
, fCount(arrayCount)
, fPrecision(precision) {
SkASSERT(kVoid_GrSLType != type);
}
/**
* Values for array count that have special meaning. We allow 1-sized arrays.
*/
enum {
kNonArray = 0, // not an array
kUnsizedArray = -1, // an unsized array (declared with [])
};
/**
* Sets as a non-array.
*/
void set(GrSLType type,
TypeModifier typeModifier,
const SkString& name,
Precision precision = kDefault_Precision) {
SkASSERT(kVoid_GrSLType != type);
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = kNonArray;
fPrecision = precision;
}
/**
* Sets as a non-array.
*/
void set(GrSLType type,
TypeModifier typeModifier,
const char* name,
Precision precision = kDefault_Precision) {
SkASSERT(kVoid_GrSLType != type);
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = kNonArray;
fPrecision = precision;
}
/**
* Set all var options
*/
void set(GrSLType type,
TypeModifier typeModifier,
const SkString& name,
int count,
Precision precision = kDefault_Precision) {
SkASSERT(kVoid_GrSLType != type);
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = count;
fPrecision = precision;
}
/**
* Set all var options
*/
void set(GrSLType type,
TypeModifier typeModifier,
const char* name,
int count,
Precision precision = kDefault_Precision) {
SkASSERT(kVoid_GrSLType != type);
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = count;
fPrecision = precision;
}
/**
* Is the var an array.
*/
bool isArray() const { return kNonArray != fCount; }
/**
* Is this an unsized array, (i.e. declared with []).
*/
bool isUnsizedArray() const { return kUnsizedArray == fCount; }
/**
* Get the array length of the var.
*/
int getArrayCount() const { return fCount; }
/**
* Set the array length of the var
*/
void setArrayCount(int count) { fCount = count; }
/**
* Set to be a non-array.
*/
void setNonArray() { fCount = kNonArray; }
/**
* Set to be an unsized array.
*/
void setUnsizedArray() { fCount = kUnsizedArray; }
/**
* Access the var name as a writable string
*/
SkString* accessName() { return &fName; }
/**
* Set the var name
*/
void setName(const SkString& n) { fName = n; }
void setName(const char* n) { fName = n; }
/**
* Get the var name.
*/
const SkString& getName() const { return fName; }
/**
* Shortcut for this->getName().c_str();
*/
const char* c_str() const { return this->getName().c_str(); }
/**
* Get the type of the var
*/
GrSLType getType() const { return fType; }
/**
* Set the type of the var
*/
void setType(GrSLType type) { fType = type; }
TypeModifier getTypeModifier() const { return fTypeModifier; }
void setTypeModifier(TypeModifier type) { fTypeModifier = type; }
/**
* Get the precision of the var
*/
Precision getPrecision() const { return fPrecision; }
/**
* Set the precision of the var
*/
void setPrecision(Precision p) { fPrecision = p; }
protected:
GrSLType fType;
TypeModifier fTypeModifier;
SkString fName;
int fCount;
Precision fPrecision;
};
#endif
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