/*
	QGL Framebuffer
	Ivan Pelipenko peri4ko@yandex.ru

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 3 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 Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef GLFRAMEBUFFER_H
#define GLFRAMEBUFFER_H

#include "glbuffer.h"


class Framebuffer
{
	friend class FramebufferMipmap;
public:
	Framebuffer(QOpenGLExtraFunctions * f_, int colorAttachments = 1, bool withDepth = true, GLenum colorFormat = GL_RGBA8, GLenum _target = GL_TEXTURE_2D);
	Framebuffer(QOpenGLExtraFunctions * f_, QVector<GLenum> colors_, bool withDepth = true, GLenum _target = GL_TEXTURE_2D);
	virtual ~Framebuffer();

	GLuint id() const {return fbo;}
	GLuint colorTexture(int index = 0) const {return colors[index];}
	//GLenum colorFormat() const {return color_format;}
	GLuint depthTexture() const {return tex_d;}
	GLenum target() const {return target_;}
	bool isInit() const {return fbo != 0;}
	int width() const {return wid;}
	int height() const {return hei;}
	QSize size() const {return QSize(wid, hei);}
	QRect rect() const {return QRect(0, 0, wid, hei);}
	QImage grab() const;
	QVector<float> grabF(int index) const;
	void queryPoint(int index, QPoint p);
	void queryPoints(int index, QRect rect, GLenum pixel_format = GL_UNSIGNED_BYTE);
	void queryImage(int index);
	uint getPoint() const;
	QVector<uint> getPointsByte() const;
	QVector<QVector4D> getPointsFloat() const;
	QImage getImage() const;
	int queriedPoints() const {return pbo_queried;}
	void blit(int index_from, GLuint fb_to, int index_to, QRect from, QRect to, GLbitfield mask = GL_COLOR_BUFFER_BIT, GLenum filter = GL_NEAREST) const;

	void resize(int width, int height, bool force = false);
	void bind();
	void release();
	void setReadBuffer(int index) {glReadBuffer(GL_COLOR_ATTACHMENT0 + index);}
	void setWriteBuffer(int index);
	void setWriteBuffers(const int * indeces, int count);
	void setWriteBuffers(const QVector<int> & indeces) {setWriteBuffers(indeces.constData(), indeces.size());}
	void setWriteBuffers();
	void unsetWriteBuffers();
	//void setColorFormat(GLenum format) {color_format = format; is_changed = true;}
	void enablePixelBuffer();
	void setColorTextureFiltering(int index, GLenum filter);

	void copyDepthFrom(GLuint tex) {;}
	void bindColorTexture(int index, int channel = 0);
	void bindColorTextures();
	void bindDepthTexture(int channel);

private:
	void deleteGLRenderbuffer(GLuint & drbo);
	void deleteGLFramebuffer(GLuint & fbo);

	bool is_depth, is_changed;
	int pbo_queried;
	QOpenGLExtraFunctions * f;
	mutable Buffer pbo;
	QVector<GLuint> colors;
	QVector<GLenum> color_formats;
	GLenum target_;
	GLuint fbo, drbo, tex_d;
	GLint prev_view[4], wid, hei;

};

#endif // GLFRAMEBUFFER_H