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//
// Copyright (c) 2013-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// shadervars.h:
// Types to represent GL variables (varyings, uniforms, etc)
//
#ifndef COMMON_SHADERVARIABLE_H_
#define COMMON_SHADERVARIABLE_H_
#include <string>
#include <vector>
#include <algorithm>
#include "GLSLANG/ShaderLang.h"
namespace sh
{
// Varying interpolation qualifier, see section 4.3.9 of the ESSL 3.00.4 spec
enum InterpolationType
{
INTERPOLATION_SMOOTH,
INTERPOLATION_CENTROID,
INTERPOLATION_FLAT
};
// Uniform block layout qualifier, see section 4.3.8.3 of the ESSL 3.00.4 spec
enum BlockLayoutType
{
BLOCKLAYOUT_STANDARD,
BLOCKLAYOUT_PACKED,
BLOCKLAYOUT_SHARED
};
// Base class for all variables defined in shaders, including Varyings, Uniforms, etc
struct ShaderVariable
{
ShaderVariable()
: type(0),
precision(0),
arraySize(0),
staticUse(false)
{}
ShaderVariable(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn)
: type(typeIn),
precision(precisionIn),
name(nameIn),
arraySize(arraySizeIn),
staticUse(false)
{}
bool isArray() const { return arraySize > 0; }
unsigned int elementCount() const { return std::max(1u, arraySize); }
GLenum type;
GLenum precision;
std::string name;
std::string mappedName;
unsigned int arraySize;
bool staticUse;
};
struct Uniform : public ShaderVariable
{
Uniform()
{}
Uniform(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn)
: ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn)
{}
bool isStruct() const { return !fields.empty(); }
std::vector<Uniform> fields;
};
struct Attribute : public ShaderVariable
{
Attribute()
: location(-1)
{}
Attribute(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, int locationIn)
: ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn),
location(locationIn)
{}
int location;
};
struct InterfaceBlockField : public ShaderVariable
{
InterfaceBlockField()
: isRowMajorMatrix(false)
{}
InterfaceBlockField(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, bool isRowMajorMatrix)
: ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn),
isRowMajorMatrix(isRowMajorMatrix)
{}
bool isStruct() const { return !fields.empty(); }
bool isRowMajorMatrix;
std::vector<InterfaceBlockField> fields;
};
struct Varying : public ShaderVariable
{
Varying()
: interpolation(INTERPOLATION_SMOOTH)
{}
Varying(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, InterpolationType interpolationIn)
: ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn),
interpolation(interpolationIn)
{}
bool isStruct() const { return !fields.empty(); }
InterpolationType interpolation;
std::vector<Varying> fields;
std::string structName;
};
struct InterfaceBlock
{
InterfaceBlock()
: arraySize(0),
layout(BLOCKLAYOUT_PACKED),
isRowMajorLayout(false),
staticUse(false)
{}
InterfaceBlock(const char *name, unsigned int arraySize)
: name(name),
arraySize(arraySize),
layout(BLOCKLAYOUT_SHARED),
isRowMajorLayout(false),
staticUse(false)
{}
std::string name;
std::string mappedName;
unsigned int arraySize;
BlockLayoutType layout;
bool isRowMajorLayout;
bool staticUse;
std::vector<InterfaceBlockField> fields;
};
}
#endif // COMMON_SHADERVARIABLE_H_
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