/*
    QGLView
    Copyright (C) 2012  Ivan Pelipenko peri4ko@gmail.com

    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 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 General Public License for more details.

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

#ifndef RENDERER_DEFERRED_SHADING_H
#define RENDERER_DEFERRED_SHADING_H

#include "qglview.h"

class RendererDeferredShading: public GLRendererBase
{
public:
	RendererDeferredShading(QGLView * view);
	virtual ~RendererDeferredShading() {if (shader_fxaa != 0) delete shader_fxaa;}

	virtual void renderScene();

protected:
	void init(int width, int height) {fbo.resize(width, height);}
	void resize(int width, int height) {fbo.resize(width, height);}
	void reloadShaders();
	void setupShadersTextures(GLObjectBase & object, RenderingParameters & rp);
	void setupShadersLights(int lights_count) {cplc = lights_count;}
	void setupDSLights(int pass, int lights_per_pass, const QMatrix4x4 & view_matrix);
	void setupAmbientLight(const QColor & a, bool first_pass);

	void prepareUniform();
	void setUniform(QGLShaderProgram * prog);
	void drawFB(QGLShaderProgram * prog);

private:
	int cplc;
	GLFramebuffer fbo;
	QGLShaderProgram * shader_fxaa, * shader_ds_0, * shader_ds_1;

	QMatrix4x4 pm, mvm, mvpm, pim, mvim, mvpim;
	QMatrix3x3 nm;
	QVector4D corner_dirs[4];
	Light amb_light;

};

#endif // RENDERER_DEFERRED_SHADING_H