include/cinder/gl/GlslProg.h

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/*
 Copyright (c) 2010, The Barbarian Group
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that
 the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and
    the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
    the following disclaimer in the documentation and/or other materials provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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*/

#pragma once

#include <string>
#include <sstream>
#include <iostream>
#include <fstream>
#include <exception>
#include <map>

#include "cinder/gl/gl.h"
#include "cinder/Vector.h"
#include "cinder/Color.h"
#include "cinder/Matrix.h"
#include "cinder/DataSource.h"

namespace cinder { namespace gl {

class GlslProg;
typedef std::shared_ptr<GlslProg>   GlslProgRef;

class GlslProg {
  public: 
    GlslProg() {}
    GlslProg( DataSourceRef vertexShader, DataSourceRef fragmentShader = DataSourceRef(), DataSourceRef geometryShader = DataSourceRef(), 
        GLint geometryInputType = GL_POINTS, GLint geometryOutputType = GL_TRIANGLES, GLint geometryOutputVertices = 0 );
    
    GlslProg( const char *vertexShader, const char *fragmentShader = 0, const char *geometryShader = 0, GLint geometryInputType = GL_POINTS, GLint geometryOutputType = GL_TRIANGLES, GLint geometryOutputVertices = 0 );

    static GlslProgRef create( DataSourceRef vertexShader, DataSourceRef fragmentShader = DataSourceRef(), DataSourceRef geometryShader = DataSourceRef(), 
        GLint geometryInputType = GL_POINTS, GLint geometryOutputType = GL_TRIANGLES, GLint geometryOutputVertices = 0 )
        { return std::shared_ptr<GlslProg>( new GlslProg( vertexShader, fragmentShader, geometryShader, geometryInputType, geometryOutputType, geometryOutputVertices ) ); }
    static GlslProgRef create( const char *vertexShader, const char *fragmentShader = 0, const char *geometryShader = 0,
        GLint geometryInputType = GL_POINTS, GLint geometryOutputType = GL_TRIANGLES, GLint geometryOutputVertices = 0 )
        { return std::shared_ptr<GlslProg>( new GlslProg( vertexShader, fragmentShader, geometryShader, geometryInputType, geometryOutputType, geometryOutputVertices ) ); }


    void            bind() const;
    static void     unbind();

    GLuint          getHandle() const { return mObj->mHandle; }

    void    uniform( const std::string &name, int data );
    void    uniform( const std::string &name, const Vec2i &data );
    void    uniform( const std::string &name, const int *data, int count );     
    void    uniform( const std::string &name, const Vec2i *data, int count );   
    void    uniform( const std::string &name, float data );
    void    uniform( const std::string &name, const Vec2f &data );
    void    uniform( const std::string &name, const Vec3f &data );
    void    uniform( const std::string &name, const Vec4f &data );
    void    uniform( const std::string &name, const Color &data );
    void    uniform( const std::string &name, const ColorA &data );
    void    uniform( const std::string &name, const Matrix22f &data, bool transpose = false );
    void    uniform( const std::string &name, const Matrix33f &data, bool transpose = false );
    void    uniform( const std::string &name, const Matrix44f &data, bool transpose = false );
    void    uniform( const std::string &name, const float *data, int count );
    void    uniform( const std::string &name, const Vec2f *data, int count );
    void    uniform( const std::string &name, const Vec3f *data, int count );
    void    uniform( const std::string &name, const Vec4f *data, int count );
    void    uniform( const std::string &name, const Matrix22f *data, int count, bool transpose = false );
    void    uniform( const std::string &name, const Matrix33f *data, int count, bool transpose = false );
    void    uniform( const std::string &name, const Matrix44f *data, int count, bool transpose = false );

    GLint   getUniformLocation( const std::string &name );
    GLint   getAttribLocation( const std::string &name );

    std::string     getShaderLog( GLuint handle ) const;

  protected:
    void            loadShader( Buffer shaderSourceBuffer, GLint shaderType );
    void            loadShader( const char *shaderSource, GLint shaderType );
    void            attachShaders();
    void            link();

    struct Obj {
        Obj() : mHandle( 0 ) {}
        ~Obj();
        
        GLuint                      mHandle;
        std::map<std::string,int>   mUniformLocs;
    };
 
    std::shared_ptr<Obj>    mObj;

  public:

    typedef std::shared_ptr<Obj> GlslProg::*unspecified_bool_type;
    operator unspecified_bool_type() const { return ( mObj.get() == 0 ) ? 0 : &GlslProg::mObj; }
    void reset() { mObj.reset(); }
};

class GlslProgCompileExc : public std::exception {
 public:    
    GlslProgCompileExc( const std::string &log, GLint aShaderType ) throw();
    virtual const char* what() const throw()
    {
        return mMessage;
    }

 private:
    char    mMessage[16001];
    GLint   mShaderType;
};

class GlslNullProgramExc : public std::exception {
 public:    
    virtual const char* what() const throw()
    {
        return "Glsl: Attempt to use null shader";
    }

};

} } // namespace cinder::gl