nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include "opengl.h"
nuclear@0: 
nuclear@0: static bool init();
nuclear@0: static void cleanup();
nuclear@0: static void disp();
nuclear@0: static void idle();
nuclear@0: static void reshape(int x, int y);
nuclear@0: static void keyb(unsigned char key, int x, int y);
nuclear@0: static void mouse(int bn, int state, int x, int y);
nuclear@0: static void motion(int x, int y);
nuclear@0: 
nuclear@0: static float cam_theta, cam_phi, cam_dist = 8.0;
nuclear@0: 
nuclear@0: static bool moving_cloth;
nuclear@0: 
nuclear@0: 
nuclear@0: int main(int argc, char **argv)
nuclear@0: {
nuclear@0: 	glutInit(&argc, argv);
nuclear@0: 	glutInitWindowSize(800, 600);
nuclear@0: 	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@0: 	glutCreateWindow("cloth");
nuclear@0: 
nuclear@0: 	glutDisplayFunc(disp);
nuclear@0: 	glutReshapeFunc(reshape);
nuclear@0: 	glutKeyboardFunc(keyb);
nuclear@0: 	glutMouseFunc(mouse);
nuclear@0: 	glutMotionFunc(motion);
nuclear@0: 	glutIdleFunc(idle);
nuclear@0: 
nuclear@0: 	if(!init()) {
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	atexit(cleanup);
nuclear@0: 
nuclear@0: 	glutMainLoop();
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: static bool init()
nuclear@0: {
nuclear@0: 	glewInit();
nuclear@0: 
nuclear@0: 	glClearColor(0.2, 0.2, 0.2, 1.0);
nuclear@0: 
nuclear@0: 	glEnable(GL_DEPTH_TEST);
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@0: 
nuclear@0: 	return true;
nuclear@0: }
nuclear@0: 
nuclear@0: static void cleanup()
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: static void disp()
nuclear@0: {
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	glTranslatef(0, 0, -cam_dist);
nuclear@0: 	glRotatef(cam_phi, 1.0, 0.0, 0.0);
nuclear@0: 	glRotatef(cam_theta, 0.0, 1.0, 0.0);
nuclear@0: 
nuclear@0: 	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
nuclear@0: 
nuclear@0: 	glutSolidTeapot(1.0);
nuclear@0: 
nuclear@0: 	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
nuclear@0: 
nuclear@0: 	glutSwapBuffers();
nuclear@0: }
nuclear@0: 
nuclear@0: static void idle()
nuclear@0: {
nuclear@0: 	glutPostRedisplay();
nuclear@0: }
nuclear@0: 
nuclear@0: static void reshape(int x, int y)
nuclear@0: {
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	gluPerspective(45.0, (float)x / (float)y, 0.5, 500.0);
nuclear@0: }
nuclear@0: 
nuclear@0: static void keyb(unsigned char key, int x, int y)
nuclear@0: {
nuclear@0: 	switch(key) {
nuclear@0: 	case 27:
nuclear@0: 		exit(0);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static bool bnstate[16];
nuclear@0: static int prev_x, prev_y;
nuclear@0: 
nuclear@0: static void mouse(int bn, int state, int x, int y)
nuclear@0: {
nuclear@0: 	int idx = bn - GLUT_LEFT_BUTTON;
nuclear@0: 	int st = state == GLUT_DOWN ? 1 : 0;
nuclear@0: 
nuclear@0: 	if(idx >= 0 && idx < 16) {
nuclear@0: 		bnstate[idx] = st;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: }
nuclear@0: 
nuclear@0: static void motion(int x, int y)
nuclear@0: {
nuclear@0: 	int dx = x - prev_x;
nuclear@0: 	int dy = y - prev_y;
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: 
nuclear@0: 	if(moving_cloth) {
nuclear@0: 	} else {
nuclear@0: 		if(bnstate[0]) {
nuclear@0: 			cam_theta += dx * 0.5;
nuclear@0: 			cam_phi += dy * 0.5;
nuclear@0: 
nuclear@0: 			if(cam_phi < -90.0) {
nuclear@0: 				cam_phi = -90.0;
nuclear@0: 			}
nuclear@0: 			if(cam_phi > 90.0) {
nuclear@0: 				cam_phi = 90.0;
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 		if(bnstate[2]) {
nuclear@0: 			cam_dist += dy * 0.1;
nuclear@0: 
nuclear@0: 			if(cam_dist < 0.0) {
nuclear@0: 				cam_dist = 0.0;
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }