Anonymous

#include <stdio.h>
#include <vector>
#include "SDL.h"
#include "SDL_opengl.h"

#include "icosahedron.hpp"

using namespace std;
#define RES_X 800
#define RES_Y 600

int
main ( int argc, char *argv[])
{
	/* Initialize the SDL library */	
	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
		fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
		exit(1);
	}
	atexit(SDL_Quit);

	SDL_GL_SetAttribute ( SDL_GL_DOUBLEBUFFER, 1 );
	SDL_Surface *screen;
	//screen = SDL_SetVideoMode(RES_X, RES_Y, 24, SDL_OPENGL|SDL_FULLSCREEN);
	screen = SDL_SetVideoMode(RES_X, RES_Y, 24, SDL_OPENGL);
	if ( screen == NULL ) {
		fprintf(stderr, "Unable to set video mode: %s\n", SDL_GetError());
		exit(1);	
	}

	srand(time(NULL));

	glClearColor( 0, 0, 0, 0);
	glViewport( 0, 0, RES_X, RES_Y );
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0, 800, 600, 0, -20.0, 20.0);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glClear ( GL_COLOR_BUFFER_BIT );

	icosahedron *ball;
	float origin[3] = { 400.0, 300.0, 0};
	ball = new icosahedron(origin);
	ball->draw();

	SDL_GL_SwapBuffers();
	SDL_Delay(1000);
	delete ball;

	return (0);
}


/* icosahedron.cpp */
#include "SDL_opengl.h"
#include "icosahedron.hpp"
#include <iostream>
using namespace std;

#define X 	.525731112119133606
#define Z	.850650808352039932

static GLfloat vdata[12][13] = {
	{-X, 0.0, Z}, {X, 0.0, Z}, {-X, 0.0, -Z}, {X, 0.0, -Z},
	{0.0, Z, X}, {0.0, Z, -X}, {0.0, -Z, X}, {0.0, -Z, -X},
	{Z, X, 0.0}, {-Z, X, 0.0}, {Z, -X, 0.0}, {-Z, -X, 0.0}
};

static GLuint tindices[20][3] = {
	{1, 4, 0}, {4, 9, 0}, {4, 5, 9}, {8, 5, 4}, {1, 8, 4},
	{1, 10, 8}, {10, 3, 8}, {8, 3, 5}, {3, 2, 5}, {3, 7, 2},
	{3, 10, 7}, {10, 6, 7}, {6, 11, 7}, {6, 0, 11}, {6, 1, 0},
	{10, 1, 6}, {11, 0, 9}, {2, 11, 9}, {5, 2, 9}, {11, 2, 7},
};

icosahedron::icosahedron ( float origin[3] )
{
	x = origin[0];
	y = origin[1];
	z = origin[2];
}

void icosahedron::draw( )
{
	glPushMatrix();
		glLoadIdentity();
		glTranslatef(x, y, z);	
		glBegin(GL_TRIANGLES);
			for (int i=0; i < 20; i++)
			{
				glColor3f( 1.0 / (i + 1), 1.0 / (i + 1), 1.0 / (i + 1));
				glVertex3fv(&vdata[tindices[i][0]][0]);
				glVertex3fv(&vdata[tindices[i][1]][0]);
				glVertex3fv(&vdata[tindices[i][2]][0]);
			}
		glEnd();

	glPopMatrix();
}