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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 "GrGLContextInfo.h"
#include "GrGLSL.h"
#include "GrStringBuilder.h"
#define USE_UNIFORM_FLOAT_ARRAYS true
/**
* Represents a variable in a shader
*/
class GrGLShaderVar {
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.
*/
enum TypeModifier {
kNone_TypeModifier,
kOut_TypeModifier,
kIn_TypeModifier,
kUniform_TypeModifier,
kAttribute_TypeModifier
};
/**
* Defaults to a float with no precision specifier
*/
GrGLShaderVar() {
fType = kFloat_GrSLType;
fTypeModifier = kNone_TypeModifier;
fCount = kNonArray;
fEmitPrecision = false;
fUseUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS;
}
GrGLShaderVar(const GrGLShaderVar& var)
: fType(var.fType)
, fTypeModifier(var.fTypeModifier)
, fName(var.fName)
, fCount(var.fCount)
, fEmitPrecision(var.fEmitPrecision)
, fUseUniformFloatArrays(var.fUseUniformFloatArrays) {}
/**
* 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 GrStringBuilder& name,
bool emitPrecision = false,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = kNonArray;
fEmitPrecision = emitPrecision;
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Sets as a non-array.
*/
void set(GrSLType type,
TypeModifier typeModifier,
const char* name,
bool specifyPrecision = false,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = kNonArray;
fEmitPrecision = specifyPrecision;
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Set all var options
*/
void set(GrSLType type,
TypeModifier typeModifier,
const GrStringBuilder& name,
int count,
bool specifyPrecision = false,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = count;
fEmitPrecision = specifyPrecision;
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Set all var options
*/
void set(GrSLType type,
TypeModifier typeModifier,
const char* name,
int count,
bool specifyPrecision = false,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
fType = type;
fTypeModifier = typeModifier;
fName = name;
fCount = count;
fEmitPrecision = specifyPrecision;
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* 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
*/
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; }
/**
* 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 GrGLContextInfo& gl, GrStringBuilder* out) const {
if (this->getTypeModifier() != kNone_TypeModifier) {
out->append(TypeModifierString(this->getTypeModifier(),
gl.glslGeneration()));
out->append(" ");
}
if (this->emitsPrecision()) {
out->append(GrGetGLSLVarPrecisionDeclType(gl.binding()));
out->append(" ");
}
GrSLType effectiveType = this->getType();
if (this->isArray()) {
if (this->isUnsizedArray()) {
out->appendf("%s %s[]",
TypeString(effectiveType),
this->getName().c_str());
} else {
GrAssert(this->getArrayCount() > 0);
out->appendf("%s %s[%d]",
TypeString(effectiveType),
this->getName().c_str(),
this->getArrayCount());
}
} else {
out->appendf("%s %s",
TypeString(effectiveType),
this->getName().c_str());
}
out->append(";\n");
}
static const char* TypeString(GrSLType t) {
switch (t) {
case kFloat_GrSLType:
return "float";
case kVec2f_GrSLType:
return "vec2";
case kVec3f_GrSLType:
return "vec3";
case kVec4f_GrSLType:
return "vec4";
case kMat33f_GrSLType:
return "mat3";
case kMat44f_GrSLType:
return "mat4";
case kSampler2D_GrSLType:
return "sampler2D";
default:
GrCrash("Unknown shader var type.");
return ""; // suppress warning
}
}
void appendArrayAccess(int index, GrStringBuilder* out) const {
out->appendf("%s[%d]%s",
this->getName().c_str(),
index,
fUseUniformFloatArrays ? "" : ".x");
}
void appendArrayAccess(const char* indexName, GrStringBuilder* out) const {
out->appendf("%s[%s]%s",
this->getName().c_str(),
indexName,
fUseUniformFloatArrays ? "" : ".x");
}
private:
static const char* TypeModifierString(TypeModifier t,
GrGLSLGeneration gen) {
switch (t) {
case kNone_TypeModifier:
return "";
case kOut_TypeModifier:
return k110_GrGLSLGeneration == gen ? "varying" : "out";
case kIn_TypeModifier:
return k110_GrGLSLGeneration == gen ? "varying" : "in";
case kUniform_TypeModifier:
return "uniform";
case kAttribute_TypeModifier:
return k110_GrGLSLGeneration == gen ? "attribute" : "in";
default:
GrCrash("Unknown shader variable type modifier.");
return ""; // suppress warning
}
}
GrSLType fType;
TypeModifier fTypeModifier;
GrStringBuilder fName;
int fCount;
bool fEmitPrecision;
/// Work around driver bugs on some hardware that don't correctly
/// support uniform float []
bool fUseUniformFloatArrays;
};
#endif
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