/****************************************************************************
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#ifndef QGLPIXMAPFILTER_P_H
#define QGLPIXMAPFILTER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <private/qpixmapfilter_p.h>

#include <QtOpenGL/qgl.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QGLPixelBuffer;

QT_MODULE(OpenGL)

class QGLPixmapFilterBase
{
public:
    virtual ~QGLPixmapFilterBase() {}
protected:
    void bindTexture(const QPixmap &src) const;
    void drawImpl(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect = QRectF()) const;

    virtual bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const = 0;
};

template <typename Filter>
class QGLPixmapFilter : public Filter, public QGLPixmapFilterBase
{
public:
    void draw(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect = QRectF())  const {
        const QRectF source = srcRect.isNull() ? QRectF(src.rect()) : srcRect;
        if (painter)
           drawImpl(painter, pos, src, source);
    }
};

class Q_OPENGL_EXPORT QGLSLProgram
{
public:
    QGLSLProgram(const QString &src);
    ~QGLSLProgram();

    bool success() const;

    void enable();
    void disable();

    int getUniformLocation(const QString &name);

    void setUniform(int uniform, int value);
    void setUniform(int uniform, qreal value);
    void setUniform(int uniform, qreal v1, qreal v2);
    void setUniform(int uniform, qreal v1, qreal v2, qreal v3);
    void setUniform(int uniform, qreal v1, qreal v2, qreal v3, qreal v4);
    void setUniform(int uniform, int count, float *v);

private:
    GLuint m_shader;
    GLuint m_program;

    GLint m_valid;

    const QGLContext *ctx;
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QGLPIXMAPFILTER_P_H