CG_Demo.cpp

/*
 * Sergio Ruiz.
 *
 * TC3022. Computer Graphics Course.
 * Basic template OpenGL project.
 */

#ifdef __APPLE__
	// See: http://lnx.cx/docs/opengl-in-xcode/
	#include <OpenGL/gl.h>
	#include <OpenGL/glu.h>
	#include <GLUT/glut.h>
#else
	#include "freeglut.h"
#endif
#include <stdio.h>
#include <math.h>

void init() // FOR GLUT LOOP
{
	glEnable(GL_DEPTH_TEST);			// Enable check for close and far objects.
	glClearColor(0.0, 0.0, 0.0, 0.0);	// Clear the color state.
	glMatrixMode(GL_MODELVIEW);			// Go to 3D mode.
	glLoadIdentity();					// Reset 3D view matrix.
}

void display()							// Called for each frame (about 60 times per second).
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);				// Clear color and depth buffers.

	glColor3f(1.0f, 1.0f, 0.0f);									// Yellow
	glutWireTeapot(1);

	glutSwapBuffers();												// Swap the hidden and visible buffers.
}

void idle()															// Called when drawing is finished.
{
	glutPostRedisplay();											// Display again.
}

void reshape(int x, int y)											// Called when the window geometry changes.
{
	glMatrixMode(GL_PROJECTION);									// Go to 2D mode.
	glLoadIdentity();												// Reset the 2D matrix.
	gluPerspective(40.0, (GLdouble)x / (GLdouble)y, 0.5, 50.0);		// Configure the camera lens aperture.
	glMatrixMode(GL_MODELVIEW);										// Go to 3D mode.
	glLoadIdentity();												// Reset the 3D matrix.
	glViewport(0, 0, x, y);											// Configure the camera frame dimensions.
	gluLookAt(0.0, 5.0, 5.0,										// Where the camera is.
		0.0, 0.0, 0.0,												// To where the camera points at.
		0.0, 1.0, 0.0);												// "UP" vector.
	display();
}

int main(int argc, char* argv[])
{
	glutInit(&argc, argv);											// Init GLUT with command line parameters.
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGB);		// Use 2 buffers (hidden and visible). Use the depth buffer. Use 3 color channels.
	glutInitWindowSize(800, 800);
	glutCreateWindow("CG DEMO");
	
	init();
	glutReshapeFunc(reshape);										// Reshape CALLBACK function.
	glutDisplayFunc(display);										// Display CALLBACK function.
	glutIdleFunc(idle);												// Idle CALLBACK function.
	glutMainLoop();													// Begin graphics program.
	return 0;														// ANSI C requires a return value.
}