/*
 * © Copyright 2014 – Urheberrechtshinweis
 * Alle Rechte vorbehalten / All Rights Reserved
 *
 * Programmcode ist urheberrechtlich geschuetzt.
 * Das Urheberrecht liegt, soweit nicht ausdruecklich anders gekennzeichnet, bei Frank Ebner.
 * Keine Verwendung ohne explizite Genehmigung.
 * (vgl. § 106 ff UrhG / § 97 UrhG)
 */

#include "../../../fixC11.h"

#include "Outline.h"

#include <QMatrix4x4>
#include <Indoor/geo/Point3.h>
#include <QOpenGLWidget>
#include "Shader.h"

Outline::Outline() {

}

void Outline::render(const RenderSettings& rs) {

	rs.shader->bind();

	// identity
	QMatrix4x4 mat;
	rs.shader->setModelMatrix(mat);

	// show both sides
	//glDisable(GL_CULL_FACE);
	//glEnable(GL_CULL_FACE);

	rs.shader->setColor(color.x, color.y, color.z);
	rs.shader->setVertices(triangles.getVertices().data());
	rs.shader->setNormals(triangles.getNormals().data());
    rs.funcs->glDrawArrays(GL_TRIANGLES, 0, triangles.getVertices().size() / 3);
	rs.shader->unsetVertices();
	rs.shader->unsetNormals();

	rs.shader->release();

}

void Outline::setColor(float r, float g, float b) {
	color = Point3(r,g,b);
}

void Outline::clear() {
	triangles.clear();
}

void Outline::add(std::vector<std::vector<Point3>>& triangles) {

	for (const std::vector<Point3>& tria : triangles) {
		for (size_t i = 2; i < tria.size(); ++i) {

			const Point3 p1 = tria[i-2];
			const Point3 p2 = tria[i-1];
			const Point3 p3 = tria[i-0];

			const Point3 n = cross(p2-p1, p3-p1);
			if (n.z < 0) {

				// upper side (floor)
                this->triangles.addTriangle(p1, p3, p2, Point3(0,0,+1));

				// facing downwards (ceiling)
                this->triangles.addTriangle(p1, p2, p3, Point3(0,0,-1));

			} else {

				// upper side (floor)
                this->triangles.addTriangle(p1, p2, p3, Point3(0,0,+1));

				// facing downwards (ceiling)
                this->triangles.addTriangle(p1, p3, p2, Point3(0,0,-1));

			}

		}
	}

}