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/*
* 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 GrGLShaderVar_DEFINED
#define GrGLShaderVar_DEFINED
#include "GrGLInterface.h"
#include "GrStringBuilder.h"
/**
* Represents a variable in a shader
*/
class GrGLShaderVar {
public:
enum Type {
kFloat_Type,
kVec2f_Type,
kVec3f_Type,
kVec4f_Type,
kMat33f_Type,
kSampler2D_Type,
};
/**
* Defaults to a float with no precision specifier
*/
GrGLShaderVar() {
fType = kFloat_Type;
fCount = kNonArray;
fEmitPrecision = false;
}
GrGLShaderVar(const GrGLShaderVar& var)
: fType(var.fType)
, fName(var.fName)
, fCount(var.fCount)
, fEmitPrecision(var.fEmitPrecision) {}
/**
* 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(Type type,
const GrStringBuilder& name,
bool emitPrecision = false) {
fType = type;
fName = name;
fCount = kNonArray;
fEmitPrecision = emitPrecision;
}
/**
* Sets as a non-array.
*/
void set(Type type,
const char* name,
bool specifyPrecision = false) {
fType = type;
fName = name;
fCount = kNonArray;
fEmitPrecision = specifyPrecision;
}
/**
* Set all var options
*/
void set(Type type,
const GrStringBuilder& name,
int count,
bool specifyPrecision = false) {
fType = type;
fName = name;
fCount = count;
fEmitPrecision = specifyPrecision;
}
/**
* Set all var options
*/
void set(Type type,
const char* name,
int count,
bool specifyPrecision = false) {
fType = type;
fName = name;
fCount = count;
fEmitPrecision = specifyPrecision;
}
/**
* 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
*/
GrStringBuilder* accessName() { return &fName; }
/**
* Set the var name
*/
void setName(const GrStringBuilder& n) { fName = n; }
void setName(const char* n) { fName = n; }
/**
* Get the var name.
*/
const GrStringBuilder& getName() const { return fName; }
/**
* Get the type of the var
*/
Type getType() const { return fType; }
/**
* Set the type of the var
*/
void setType(Type type) { fType = type; }
/**
* Must the variable declaration emit a precision specifier
*/
bool emitsPrecision() const { return fEmitPrecision; }
/**
* Specify whether the declaration should specify precision
*/
void setEmitPrecision(bool p) { fEmitPrecision = p; }
/**
* Write a declaration of this variable to out.
*/
void appendDecl(const GrGLInterface* gl, GrStringBuilder* out) const {
if (this->emitsPrecision()) {
out->append(PrecisionString(gl));
out->append(" ");
}
if (this->isArray()) {
if (this->isUnsizedArray()) {
out->appendf("%s %s[]",
TypeString(this->getType()),
this->getName().c_str());
} else {
GrAssert(this->getArrayCount() > 0);
out->appendf("%s %s[%d]",
TypeString(this->getType()),
this->getName().c_str(),
this->getArrayCount());
}
} else {
out->appendf("%s %s",
TypeString(this->getType()),
this->getName().c_str());
}
}
static const char* TypeString(Type t) {
switch (t) {
case kFloat_Type:
return "float";
case kVec2f_Type:
return "vec2";
case kVec3f_Type:
return "vec3";
case kVec4f_Type:
return "vec4";
case kMat33f_Type:
return "mat3";
case kSampler2D_Type:
return "sampler2D";
default:
GrCrash("Unknown shader var type.");
return ""; // suppress warning
}
}
private:
static const char* PrecisionString(const GrGLInterface* gl) {
return gl->supportsDesktop() ? "" : "mediump";
}
Type fType;
GrStringBuilder fName;
int fCount;
bool fEmitPrecision;
};
#endif
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