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/*
* Main.c
*
* This file is part of the openGL-logo demo.
* (c) Henk Kok (kok@wins.uva.nl)
*
* Copying, redistributing, etc is permitted as long as this copyright
* notice and the Dutch variable names :) stay in tact.
*/
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
GLfloat lightpos[4] = { 1.0, 1.0, 1.0, 0.0 };
GLfloat lightamb[4] = { 0.3, 0.3, 0.3, 1.0 };
GLfloat lightdif[4] = { 0.8, 0.8, 0.8, 1.0 };
float speed=0, progress = 1;
void SetCamera(void);
extern void randomize(void);
extern void def_logo(void);
extern void draw_logo(void);
void do_display (void)
{
SetCamera();
draw_logo();
glFlush();
glutSwapBuffers();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
do_display();
}
void myinit (void)
{
glShadeModel (GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
glLightfv(GL_LIGHT0, GL_AMBIENT, lightamb);
glLightfv(GL_LIGHT0, GL_DIFFUSE, lightdif);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glColor3f(1.0, 1.0, 1.0);
glClearColor(0.0, 0.0, 0.0, 1.0);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glEnable(GL_NORMALIZE);
def_logo();
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
}
/* ARGSUSED1 */
void parsekey(unsigned char key, int x, int y)
{
switch (key)
{
case 27: exit(0); break;
case 13: break;
case ' ': progress = 1; randomize(); break;
}
}
/* ARGSUSED1 */
void parsekey_special(int key, int x, int y)
{
switch (key)
{
case GLUT_KEY_UP: break;
case GLUT_KEY_DOWN: break;
case GLUT_KEY_RIGHT: break;
case GLUT_KEY_LEFT: break;
}
}
void Animate(void)
{
speed = -0.95*speed + progress*0.05;
if (progress > 0.0 && speed < 0.0003)
speed = 0.0003;
if (speed > 0.01)
speed = 0.01;
progress = progress - speed;
if (progress < 0.0)
{
progress = 0.0;
speed = 0;
}
glutPostRedisplay();
}
void myReshape(int w, int h)
{
glMatrixMode (GL_MODELVIEW);
glViewport (0, 0, w, h);
glLoadIdentity();
SetCamera();
}
void SetCamera(void)
{
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
glFrustum (-0.1333, 0.1333, -0.1, 0.1, 0.2, 150.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0,1.5,2, 0,1.5,0, 0,1,0);
glTranslatef(0.0, -8.0, -45.0);
glRotatef(-progress*720, 0.0, 1.0, 0.0);
}
int main(int argc, char *argv[])
{
glutInitDisplayMode(GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE | GLUT_MULTISAMPLE);
glutInitWindowPosition(200, 0);
glutInitWindowSize(640, 480);
glutCreateWindow("Rotating OpenGL Logo");
glutDisplayFunc(display);
glutKeyboardFunc(parsekey);
glutSpecialFunc(parsekey_special);
glutReshapeFunc(myReshape);
glutIdleFunc(Animate);
randomize();
myinit();
glutSwapBuffers();
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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