#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(vertices.data());
	rs.shader->setNormals(normals.data());
	glDrawArrays(GL_TRIANGLES, 0, vertices.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() {
	normals.clear();
	vertices.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) {
				vertices.push_back(p1.x);	vertices.push_back(p1.y);	vertices.push_back(p1.z);
				vertices.push_back(p3.x);	vertices.push_back(p3.y);	vertices.push_back(p3.z);
				vertices.push_back(p2.x);	vertices.push_back(p2.y);	vertices.push_back(p2.z);
			} else {
				vertices.push_back(p1.x);	vertices.push_back(p1.y);	vertices.push_back(p1.z);
				vertices.push_back(p2.x);	vertices.push_back(p2.y);	vertices.push_back(p2.z);
				vertices.push_back(p3.x);	vertices.push_back(p3.y);	vertices.push_back(p3.z);
			}

			normals.push_back(0);		normals.push_back(0);		normals.push_back(1);
			normals.push_back(0);		normals.push_back(0);		normals.push_back(1);
			normals.push_back(0);		normals.push_back(0);		normals.push_back(1);

		}
	}

}