#include "MapView.h"

#include <QGLShaderProgram>
#include "Geometry.h"

// http://doc.qt.io/qt-5/qtopengl-cube-example.html

MapView::MapView(QWidget* parent) : QOpenGLWidget(parent) {


};

void MapView::timerEvent(QTimerEvent *) {
	update();
}

void MapView::initializeGL() {

	//qglClearColor(Qt::black);

	//glEnable(GL_DEPTH_TEST);
	//glEnable(GL_CULL_FACE);
	//glShadeModel(GL_SMOOTH);
	//glEnable(GL_LIGHTING);
	//glEnable(GL_LIGHT0);

	//static GLfloat lightPosition[4] = { 0, 0, 10, 1.0 };
	//glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);

	initializeOpenGLFunctions();

	geo = new Geometry();

	if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/res/gl/vertex1.glsl")) {throw "1";}
	if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/res/gl/fragment1.glsl")) {throw "2";}
	if (!program.link()) {throw "3";}
	if (!program.bind()) {throw "4";}

	timer.start(60, this);

}

void MapView::paintGL() {
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	//glLoadIdentity();
	//glTranslatef(0.0, 0.0, -10.0);
	//glRotatef(20 / 16.0, 1.0, 0.0, 0.0);
	//glRotatef(30 / 16.0, 0.0, 1.0, 0.0);
	//glRotatef(60 / 16.0, 0.0, 0.0, 1.0);
	draw();
}

void MapView::resizeGL(int w, int h) {

	// Calculate aspect ratio
	qreal aspect = qreal(w) / qreal(h ? h : 1);

	// Set near plane to 3.0, far plane to 7.0, field of view 45 degrees
	const qreal zNear = 3.0, zFar = 7.0, fov = 45.0;

	// Reset projection
	projection.setToIdentity();

	// Set perspective projection
	projection.perspective(fov, aspect, zNear, zFar);

}

void MapView::draw() {


	static float angularSpeed = 0;
	angularSpeed += 0.5;

	// Clear color and depth buffer
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		//texture->bind();
		QVector3D rotationAxis(1,1,1);
		QQuaternion rotation = QQuaternion::fromAxisAndAngle(rotationAxis, angularSpeed);

		// Calculate model view transformation
		QMatrix4x4 matrix;
		matrix.translate(0.0, 0.0, -5.0);
		matrix.rotate(rotation);

		// Set modelview-projection matrix
		program.setUniformValue("mvp_matrix", projection * matrix);

		// Use texture unit 0 which contains cube.png
		program.setUniformValue("texture", 0);

		// Draw cube geometry
		geo->drawCubeGeometry(&program);

	//qglColor(Qt::red);
	/*glBegin(GL_QUADS);
			glNormal3f(0,0,-1);
			glVertex3f(-1,-1,0);
			glVertex3f(-1,1,0);
			glVertex3f(1,1,0);
			glVertex3f(1,-1,0);

		glEnd();
		glBegin(GL_TRIANGLES);
			glNormal3f(0,-1,0.707);
			glVertex3f(-1,-1,0);
			glVertex3f(1,-1,0);
			glVertex3f(0,0,1.2);
		glEnd();
		glBegin(GL_TRIANGLES);
			glNormal3f(1,0, 0.707);
			glVertex3f(1,-1,0);
			glVertex3f(1,1,0);
			glVertex3f(0,0,1.2);
		glEnd();
		glBegin(GL_TRIANGLES);
			glNormal3f(0,1,0.707);
			glVertex3f(1,1,0);
			glVertex3f(-1,1,0);
			glVertex3f(0,0,1.2);
		glEnd();
		glBegin(GL_TRIANGLES);
			glNormal3f(-1,0,0.707);
			glVertex3f(-1,1,0);
			glVertex3f(-1,-1,0);
			glVertex3f(0,0,1.2);
		glEnd();*/
}