//

// File:       shader.h

//

// Version:    <1.0>

//

// Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc. ("Apple")

//             in consideration of your agreement to the following terms, and your use,

//             installation, modification or redistribution of this Apple software

//             constitutes acceptance of these terms.  If you do not agree with these

//             terms, please do not use, install, modify or redistribute this Apple

//             software.

//

//             In consideration of your agreement to abide by the following terms, and

//             subject to these terms, Apple grants you a personal, non - exclusive

//             license, under Apple's copyrights in this original Apple software ( the

//             "Apple Software" ), to use, reproduce, modify and redistribute the Apple

//             Software, with or without modifications, in source and / or binary forms;

//             provided that if you redistribute the Apple Software in its entirety and

//             without modifications, you must retain this notice and the following text

//             and disclaimers in all such redistributions of the Apple Software. Neither

//             the name, trademarks, service marks or logos of Apple Inc. may be used to

//             endorse or promote products derived from the Apple Software without specific

//             prior written permission from Apple.  Except as expressly stated in this

//             notice, no other rights or licenses, express or implied, are granted by

//             Apple herein, including but not limited to any patent rights that may be

//             infringed by your derivative works or by other works in which the Apple

//             Software may be incorporated.

//

//             The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

//             WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

//             WARRANTIES OF NON - INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A

//             PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION

//             ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

//

//             IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

//             CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

//             SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

//             INTERRUPTION ) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION

//             AND / OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER

//             UNDER THEORY OF CONTRACT, TORT ( INCLUDING NEGLIGENCE ), STRICT LIABILITY OR

//             OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Copyright ( C ) 2008 Apple Inc. All Rights Reserved.

//

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

#ifndef __SHADER_H__

#define __SHADER_H__

#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>::iterator UniformMapIter;

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

    uint m_uiProgram;

};

#endif