/*
 * © 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 "Window.h"
#include "Shader.h"

#include <Indoor/geo/Point3.h>
#include <Indoor/math/Math.h>

static float window_vertices[] = {

	+1, 0, +1,
	-1, 0, +1,
	-1, 0, -1,

	-1, 0, -1,
	+1, 0, -1,
	+1, 0, +1,

	-1, 0, +1,
	+1, 0, +1,
	-1, 0, -1,

	+1, 0, -1,
	-1, 0, -1,
	+1, 0, +1,

};

static float window_normals[] = {

	0,-1,0,
	0,-1,0,
	0,-1,0,

	0,-1,0,
	0,-1,0,
	0,-1,0,

	0,+1,0,
	0,+1,0,
	0,+1,0,

	0,+1,0,
	0,+1,0,
	0,+1,0,

};

Window::Window(const Point2 from, const Point2 to, float atHeight, float height) :
	from(from), to(to), atHeight(atHeight), height(height) {

	const Point2 cen = (from+to)/2;

	const float sx = from.getDistance(to) / 2.0f;
	const float sz = height / 2.0f;

	const float rad = -std::atan2(to.y - from.y, to.x - from.x);
	const float deg = rad * 180 / M_PI;

	mat.translate(cen.x, cen.y, atHeight + height/2);
	mat.rotate(deg, 0, 0, 1);
	mat.scale(sx, 1, sz);

}

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

	rs.shader->bind();

	rs.shader->setColor(0.75, 0.85, 1.0, 0.35);

    rs.funcs->glEnable(GL_BLEND);
    rs.funcs->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	//glDisable(GL_CULL_FACE);

	rs.shader->setModelMatrix(mat);

	rs.shader->setVertices(window_vertices);
	rs.shader->setNormals(window_normals);
    rs.funcs->glDrawArrays(GL_TRIANGLES, 0, 12);
	rs.shader->unsetVertices();
	rs.shader->unsetNormals();

	//glEnable(GL_CULL_FACE);
    rs.funcs->glDisable(GL_BLEND);

	rs.shader->release();

}