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////////////////////////////////////////////////////////////////////////////////////////////////////

#ifndef __SHADER__

#define __SHADER__

#include "compute_types.h"

#include <OpenGL/gl.h>

#include <map>

class Shader

{

public:

    struct Uniform

    {

        union 

        {

            int i[16];

            float f[16];

        } value;

        int location;

        int length;

        bool integer;

        bool changed;

        Uniform() :

            location(0), length(0), integer(false), changed(false) 

        { 

            memset(value.i, 0, 16 * sizeof(int)); 

        }

        Uniform(const Uniform& rkOther) :

            location(rkOther.location), 

            length(rkOther.length), 

            integer(rkOther.integer), 

            changed(rkOther.changed) 

        { 

            memcpy(value.i, rkOther.value.i, 16 * sizeof(int));

        }

    };

public:

    Shader();

    ~Shader();

    void enable();

    void disable();

    void destroy();

    bool setUniform1f(const char* acName, float fV);

    bool setUniform2f(const char* acName, const float2 &rkV);

    bool setUniform3f(const char* acName, const float3 &rkV);

    bool setUniform4f(const char* acName, const float4 &rkV);

    bool setUniform16f(const char* acName, const float16 &rkVV);

    bool setUniform1i(const char* acName, int iV);

    GLuint getVertexAttribLocation(const char *name);   

    bool compile(const char* acVertexSource, const char* acFragmentSource);

    bool loadAndCompile(const char* acVertexFilename, const char* acFragmentFilename);

protected:

    void checkStatus(const char* acMessage);

    typedef std::map<const char*, Uniform, ltstr>::iterator UniformMapIter;

    std::map<const char*, Uniform, ltstr> m_akUniforms;

    uint m_uiProgram;

};

#endif