axmol/cocos/2d/CCGLProgramState.h

/****************************************************************************
Copyright 2014 Chukong Technologies Inc.
 
http://www.cocos2d-x.org
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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****************************************************************************/

#ifndef __CCGLPROGRAMSTATE_H__
#define __CCGLPROGRAMSTATE_H__

#include "base/ccTypes.h"
#include "base/CCVector.h"
#include "2d/CCTexture2D.h"
#include "math/Vector2.h"
#include "math/Vector3.h"
#include "math/Vector4.h"

#include <unordered_map>

NS_CC_BEGIN

class GLProgram;
class Uniform;
class VertexAttrib;

//
//
// UniformValue
//
//
class UniformValue
{
    friend class GLProgram;

public:
    UniformValue();
    UniformValue(Uniform *uniform, GLProgram* glprogram);
    ~UniformValue();

	void setValue(float value);
	void setValue(int value);
	void setValue(const Vector2& value);
	void setValue(const Vector3& value);
	void setValue(const Vector4& value);
	void setValue(const Matrix& value);
    void setValue(const std::function<void(Uniform*)> callback);

    void apply();

protected:
	Uniform* _uniform;  // weak ref
    GLProgram* _glprogram; // weak ref
    bool _useCallback;

    union U{
        float floatValue;
        int intValue;
        Vector2 v2Value;
        Vector3 v3Value;
        Vector4 v4Value;
        Matrix matrixValue;
        std::function<void(Uniform*)> callback;

        U() { memset( this, 0, sizeof(*this) ); }
        ~U(){}
        U& operator=( const U& other ) {
            memcpy(this, &other, sizeof(*this));
            return *this;
        }
    } _value;
};

//
//
// VertexAttribValue
//
//
class VertexAttribValue
{
    friend class GLProgram;

public:
    VertexAttribValue(VertexAttrib *vertexAttrib);
    VertexAttribValue();
    ~VertexAttribValue();

	void setValue(GLint size, GLenum type, GLboolean normalized, GLsizei stride, GLvoid *pointer);
    void setValue(const std::function<void(VertexAttrib*)> callback);
    void apply();

protected:
	VertexAttrib* _vertexAttrib;  // weak ref
    bool _useCallback;

    union U{
        struct {
            GLint size;
            GLenum type;
            GLboolean normalized;
            GLsizei stride;
            GLvoid *pointer;
        } pointer;
        std::function<void(VertexAttrib*)> callback;

        U() { memset( this, 0, sizeof(*this) ); }
        ~U(){}
        U& operator=( const U& other ) {
            memcpy(this, &other, sizeof(*this));
            return *this;
        }
    } _value;
};


//
//
// GLProgramState
//
//
class GLProgramState : public Ref
{
public:
    GLProgramState* create(GLProgram* glprogram);

    void apply();
    void setTexture(Texture2D *texture) { _textures.insert(0, texture); }
    Texture2D* getTexture() const { return _textures.at(0); }

    void setBlendFunc(const BlendFunc& blendFunc) { _blendFunc = blendFunc; }
    const BlendFunc& getBlendFunc() const { return _blendFunc; }

    UniformValue* getUniformValue(const std::string &uniformName);
    VertexAttribValue* getVertexAttribValue(const std::string &attributeName);

protected:
    GLProgramState();
    ~GLProgramState();
    bool init(GLProgram* program);

    std::unordered_map<std::string, UniformValue> _uniforms;
    std::unordered_map<std::string, VertexAttribValue> _attributes;
    
    GLProgram *_glprogram;
    Vector<Texture2D*> _textures;
    BlendFunc _blendFunc;
};

NS_CC_END

#endif /* __CCGLPROGRAMSTATE_H__ */