#include "stdafx.h"

/*ejercicio: cubo, piso, foco + controles mediante teclas*/

GLfloat colors[][3] = { { 0.0,0.0,0.0 },{ 1.0,0.0,0.0 },
{ 1.0,1.0,0.0 },{ 0.0,1.0,0.0 },{ 0.0,0.0,1.0 },
{ 1.0,0.0,1.0 },{ 1.0,1.0,1.0 },{ 0.0,1.0,1.0 } };

GLfloat ex = 15.0f;
GLfloat ey = 30.0f;
GLfloat ez = -10.0f;
GLfloat delta = 0.01f;
GLfloat deltaR = 0.01f;

GLenum shademode = GL_FLAT;
GLboolean bCull = glIsEnabled(GL_CULL_FACE);
GLboolean bDepth = glIsEnabled(GL_DEPTH_TEST);
GLboolean bOutline = (GLboolean)true;


void cuadrado() {
	glBegin(GL_POLYGON);
	glVertex2f(1., 1.);
	glVertex2f(1., -1.);
	glVertex2f(-1., -1.);
	glVertex2f(-1., 1.);
	glEnd();
}

void colorcube1(void)
{
	glPushMatrix();
	glScalef(0.3, 0.3, 0.3);
	/* cara1 */
	glPushMatrix();
	glColor3fv(colors[1]);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();
	/* cara2 */
	glPushMatrix();
	glColor3fv(colors[2]);
	glRotatef(90., 1., 0., 0.);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();

	/* cara3 */
	glPushMatrix();
	glColor3fv(colors[3]);
	glRotatef(180., 1., 0., 0.);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();

	/* cara4 */
	glPushMatrix();
	glColor3fv(colors[4]);
	glRotatef(270., 1., 0., 0.);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();

	/* cara5 */
	glPushMatrix();
	glColor3fv(colors[5]);
	glRotatef(90., 0., 0., 1.);
	glRotatef(270., 1., 0., 0.);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();

	/* cara6 */
	glPushMatrix();
	glColor3fv(colors[7]);
	glRotatef(-90., 0., 0., 1.);
	glRotatef(270., 1., 0., 0.);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();

	glPopMatrix();
}
void SpecialKeys(int key, int x, int y)
{
	GLfloat dx, dz;


	if (key == GLUT_KEY_UP)
	{//increase distance from camera to origin
		ex *= (1.0f + deltaR);  ey *= (1.0f + deltaR);	ez *= (1.0f + deltaR);
	}

	if (key == GLUT_KEY_DOWN)
	{//reduce distance from camera to origin (close up)
		ex *= (1.0f - deltaR); ey *= (1.0f - deltaR);	ez *= (1.0f - deltaR);
	}

	if (key == GLUT_KEY_LEFT)
		//Rotate camera around origin in Oxz plane
	{
		dx = -ez;     dz = ex;
		GLfloat s = sqrtf(ex*ex + ey*ey + ez*ez);
		ex += delta*dx;       ez += delta*dz;
		GLfloat s1 = sqrtf(ex*ex + ey*ey + ez*ez) / s;
		ex /= s1;	ey /= s1;	ey /= s1;
	}

	if (key == GLUT_KEY_RIGHT)
		//Rotate camera around origin in Oxz plane
	{
		dx = -ez;     dz = ex;
		GLfloat s = sqrtf(ex*ex + ey*ey + ez*ez);
		ex -= delta*dx;      	ez -= delta*dz;
		GLfloat s1 = sqrtf(ex*ex + ey*ey + ez*ez) / s;
		ex /= s1;	ey /= s1;	ey /= s1;
	}


	if (key == GLUT_KEY_F1) bCull = !bCull;
	if (key == GLUT_KEY_F2)bDepth = !bDepth;
	if (key == GLUT_KEY_F3)bOutline = !bOutline;
	if (key == GLUT_KEY_F4)
	{
		if (shademode == GL_FLAT) { shademode = GL_SMOOTH; }
		else { if (shademode == GL_SMOOTH) { shademode = GL_FLAT; } };
		glShadeModel(shademode);
	}

	// Refresh the Window
	glutPostRedisplay();
}

void piso() {
	glColor3f(0.5, 0.5, 0.5);
	glPushMatrix();
	glScalef(1.5, 1.5, 1.5);
	glRotatef(90., 1, 0, 0);
	glTranslatef(0., 0., 1.);
	cuadrado();
	glPopMatrix();
}

void foco() {
	glColor3fv(colors[2]);
	glPushMatrix();
	glTranslatef(0.3, 2., -0.2);
	glScalef(.05, .05, .05);
	glutSolidSphere(1., 20, 20);
	glPopMatrix();
}

void display(void)
{
	/* display callback, clear frame buffer and z buffer,
	rotate cube and draw, swap buffers */

	// Turn culling on if flag is set
	if (bCull)   glEnable(GL_CULL_FACE);
	else        glDisable(GL_CULL_FACE);

	// Enable depth testing if flag is set
	if (bDepth)  glEnable(GL_DEPTH_TEST);
	else        glDisable(GL_DEPTH_TEST);

	// Draw the back side as a wireframe only, if flag is set
	if (bOutline)glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
	else        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	gluLookAt(ex, ey, ez, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

	piso();
	colorcube1();
	foco();

	glFlush();
	glutSwapBuffers();
}

void myReshape(int w, int h)
{
	glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	/*if (w <= h)
	glOrtho(-2.0, 2.0, -2.0 * (GLfloat)h / (GLfloat)w,
	2.0 * (GLfloat)h / (GLfloat)w, -100.0, 100.0);
	else
	glOrtho(-2.0 * (GLfloat)w / (GLfloat)h,
	2.0 * (GLfloat)w / (GLfloat)h, -2.0, 2.0, -100.0, 100.0);*/
	gluPerspective(60.0, 1.0, 1.5, 500.0);
	glMatrixMode(GL_MODELVIEW);
}

void
main(int argc, char **argv)
{
	glutInit(&argc, argv);

	/* need both double buffering and z buffer */

	glutInitDisplayMode(/*GLUT_DOUBLE*/GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
	glutInitWindowSize(500, 500);
	glutCreateWindow("colorcube");
	glutReshapeFunc(myReshape);
	glutDisplayFunc(display);
	glutSpecialFunc(SpecialKeys);
	//glutIdleFunc(spinCube);
	//glutMouseFunc(mouse);
	glEnable(GL_DEPTH_TEST); /* Enable hidden--surface--removal */
	glShadeModel(GL_FLAT);
	glutMainLoop();
}