StelGLSLShader.hpp

/*
 * Stellarium
 * Copyright (C) 2012 Ferdinand Majerech
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335, USA.
 */

#ifndef _STELGLSLSHADER_HPP_
#define _STELGLSLSHADER_HPP_

#include "VecMath.hpp"

class StelGLSLShader
{
public:
    virtual ~StelGLSLShader(){};

    virtual bool addVertexShader(const QString& source) = 0;
    
    virtual bool addFragmentShader(const QString& source) = 0;

    virtual bool addVertexShader(const QString& name, const QString& source) = 0;

    virtual bool hasVertexShader(const QString& name) const = 0;

    virtual void enableVertexShader(const QString& name) = 0;

    virtual void disableVertexShader(const QString& name) = 0;

    virtual bool build() = 0;

    virtual void unlock() = 0;

    virtual QString log() const = 0;

    virtual void bind() = 0;

    virtual void release() = 0;

    template<class T>
    void setUniformValue(const char* const name, T value)
    {
        // Calls a virtual function for every type (since we can't have virtual templates).
        // Unsupported types are asserted out at runtime 
        // (with C++11, static assert should be used instead)
        setUniformValue_(name, value);
    }

    virtual void useUnprojectedPositionAttribute() = 0;

protected:
    template<class T>
    void setUniformValue_(const char* const name, T value)
    {
        Q_UNUSED(name);
        Q_UNUSED(value);
        //TODO C++11: use static assert here (for a compile-time error)
        Q_ASSERT_X(false, Q_FUNC_INFO,
                   "Unsupported uniform data type. "
                   "Supported types: bool, int, float, Vec2f, Vec3f, Vec4f, Mat4f");
    }

    virtual void setUniformValue_(const char* const name, const bool value) = 0;

    virtual void setUniformValue_(const char* const name, const int value) = 0;

    virtual void setUniformValue_(const char* const name, const float value) = 0;

    virtual void setUniformValue_(const char* const name, const Vec2f value) = 0;

    virtual void setUniformValue_(const char* const name, const Vec3f& value) = 0;

    virtual void setUniformValue_(const char* const name, const Vec4f& value) = 0;

    virtual void setUniformValue_(const char* const name, const Mat4f& value) = 0;
};

#endif // _STELGLSLSHADER_HPP_