nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <math.h>
nuclear@0: 
nuclear@0: #include <GL/glew.h>
nuclear@0: #ifndef __APPLE__
nuclear@0: #include <GL/glut.h>
nuclear@0: #else
nuclear@0: #include <GLUT/glut.h>
nuclear@0: #endif
nuclear@0: 
nuclear@0: #include "scene.h"
nuclear@0: 
nuclear@0: void disp(void);
nuclear@0: void render(unsigned int msec);
nuclear@0: void proj_matrix(float eye);
nuclear@0: void view_matrix(float eye);
nuclear@0: 
nuclear@0: void reshape(int x, int y);
nuclear@0: void keyb(unsigned char key, int x, int y);
nuclear@0: void keyb_up(unsigned char key, int x, int y);
nuclear@0: void mouse(int bn, int state, int x, int y);
nuclear@0: void motion(int x, int y);
nuclear@0: void sball_motion(int x, int y, int z);
nuclear@0: void sball_rotate(int x, int y, int z);
nuclear@0: void sball_button(int bn, int state);
nuclear@0: int parse_args(int argc, char **argv);
nuclear@0: 
nuclear@0: int win_width, win_height;
nuclear@0: int stereo;
nuclear@0: int flip_winding;
nuclear@3: int auto_rot;
nuclear@0: float cam_theta, cam_phi, cam_dist = 10;
nuclear@0: float near_clip = 0.5;
nuclear@0: float far_clip = 1000.0;
nuclear@0: float fov = M_PI / 4.0;
nuclear@0: float stereo_focus_dist = 1.0;
nuclear@0: float stereo_eye_sep = 1.0 / 30.0;
nuclear@0: 
nuclear@3: int verbose = 0;
nuclear@3: 
nuclear@0: struct scene scn;
nuclear@0: 
nuclear@0: int main(int argc, char **argv)
nuclear@0: {
nuclear@4: 	float amb[] = {0.01, 0.01, 0.01, 1};
nuclear@3: 	float ldir[] = {-1, 1, 1, 0};
nuclear@0: 	float dx, dy, dz, diag;
nuclear@0: 
nuclear@8: 
nuclear@0: 	glutInitWindowSize(800, 600);
nuclear@0: 	glutInit(&argc, argv);
nuclear@0: 	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | (stereo ? GLUT_STEREO : 0));
nuclear@4: 	glutCreateWindow("OpenGL 3D viewer");
nuclear@0: 
nuclear@0: 	glutDisplayFunc(disp);
nuclear@0: 	glutReshapeFunc(reshape);
nuclear@0: 	glutKeyboardFunc(keyb);
nuclear@0: 	glutKeyboardUpFunc(keyb_up);
nuclear@0: 	glutMouseFunc(mouse);
nuclear@0: 	glutMotionFunc(motion);
nuclear@0: 	glutSpaceballMotionFunc(sball_motion);
nuclear@0: 	glutSpaceballRotateFunc(sball_rotate);
nuclear@0: 	glutSpaceballButtonFunc(sball_button);
nuclear@3: 	if(auto_rot) {
nuclear@3: 		glutIdleFunc(glutPostRedisplay);
nuclear@3: 	}
nuclear@0: 
nuclear@0: 	glewInit();
nuclear@0: 
nuclear@4: 	glEnable(GL_NORMALIZE);
nuclear@0: 	glEnable(GL_DEPTH_TEST);
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@0: 	glEnable(GL_LIGHTING);
nuclear@0: 	glEnable(GL_LIGHT0);
nuclear@0: 	glLightfv(GL_LIGHT0, GL_POSITION, ldir);
nuclear@0: 
nuclear@4: 	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, amb);
nuclear@4: 
nuclear@8: 
nuclear@8: 	init_scene(&scn);
nuclear@8: 	if(parse_args(argc, argv) == -1) {
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@8: 	if(verbose) {
nuclear@8: 		printf("scene bounds: %.2f %.2f %.2f -> %.2f %.2f %.2f\n", scn.bbox.min[0], scn.bbox.min[1],
nuclear@8: 				scn.bbox.min[2], scn.bbox.max[0], scn.bbox.max[1], scn.bbox.max[2]);
nuclear@8: 	}
nuclear@8: 
nuclear@0: 	dx = scn.bbox.max[0] - scn.bbox.min[0];
nuclear@0: 	dy = scn.bbox.max[1] - scn.bbox.min[1];
nuclear@0: 	dz = scn.bbox.max[2] - scn.bbox.min[2];
nuclear@0: 	diag = sqrt(dx * dx + dy * dy + dz * dz);
nuclear@0: 	cam_dist = diag / fov;
nuclear@0: 	printf("camera distance: %f\n", cam_dist);
nuclear@0: 
nuclear@0: 	glutMainLoop();
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: void disp(void)
nuclear@0: {
nuclear@0: 	unsigned int tm = glutGet(GLUT_ELAPSED_TIME);
nuclear@0: 
nuclear@0: 	if(stereo) {
nuclear@0: 		glDrawBuffer(GL_BACK_LEFT);
nuclear@0: 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@0: 		glMatrixMode(GL_PROJECTION);
nuclear@0: 		glLoadIdentity();
nuclear@0: 		proj_matrix(-1);
nuclear@0: 		glMatrixMode(GL_MODELVIEW);
nuclear@0: 		glLoadIdentity();
nuclear@0: 		view_matrix(-1);
nuclear@0: 
nuclear@0: 		render(tm);
nuclear@0: 
nuclear@0: 		glDrawBuffer(GL_BACK_RIGHT);
nuclear@0: 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@0: 		glMatrixMode(GL_PROJECTION);
nuclear@0: 		glLoadIdentity();
nuclear@0: 		proj_matrix(1);
nuclear@0: 		glMatrixMode(GL_MODELVIEW);
nuclear@0: 		glLoadIdentity();
nuclear@0: 		view_matrix(1);
nuclear@0: 
nuclear@0: 		render(tm);
nuclear@0: 	} else {
nuclear@0: 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@0: 		glMatrixMode(GL_PROJECTION);
nuclear@0: 		glLoadIdentity();
nuclear@0: 		proj_matrix(0);
nuclear@0: 		glMatrixMode(GL_MODELVIEW);
nuclear@0: 		glLoadIdentity();
nuclear@0: 		view_matrix(0);
nuclear@0: 
nuclear@0: 		render(tm);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glutSwapBuffers();
nuclear@0: }
nuclear@0: 
nuclear@0: void render(unsigned int msec)
nuclear@0: {
nuclear@0: 	if(auto_rot) {
nuclear@0: 		glRotatef(msec / 10, 0, 1, 0);
nuclear@0: 	}
nuclear@0: 	render_scene(&scn);
nuclear@0: }
nuclear@0: 
nuclear@0: void proj_matrix(float eye)
nuclear@0: {
nuclear@0: 	float vfov_rad = fov;
nuclear@0: 	float top = near_clip * tan(vfov_rad * 0.5);
nuclear@0: 	float right = top * (float)win_width / (float)win_height;
nuclear@0: 
nuclear@0: 	float frust_shift = eye * (stereo_eye_sep * 0.5 * near_clip / stereo_focus_dist);
nuclear@0: 
nuclear@0: 	glFrustum(-right + frust_shift, right + frust_shift, -top, top, near_clip, far_clip);
nuclear@0: }
nuclear@0: 
nuclear@0: void view_matrix(float eye)
nuclear@0: {
nuclear@0: 	float offs = stereo_eye_sep * eye * 0.5;
nuclear@0: 	glTranslatef(offs, 0, 0);
nuclear@0: 
nuclear@0: 	glTranslatef(0, 0, -cam_dist);
nuclear@0: 	glRotatef(cam_phi, 1, 0, 0);
nuclear@0: 	glRotatef(cam_theta, 0, 1, 0);
nuclear@0: }
nuclear@0: 
nuclear@0: void reshape(int x, int y)
nuclear@0: {
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 	win_width = x;
nuclear@0: 	win_height = y;
nuclear@0: }
nuclear@0: 
nuclear@0: static int stereo_shift_key;
nuclear@0: 
nuclear@0: void keyb(unsigned char key, int x, int y)
nuclear@0: {
nuclear@0: 	switch(key) {
nuclear@0: 	case 'q':
nuclear@0: 	case 27:
nuclear@0: 		exit(0);
nuclear@0: 
nuclear@0: 	case 's':
nuclear@0: 		stereo_shift_key = 1;
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'c':
nuclear@0: 		{
nuclear@0: 			static int flip;
nuclear@0: 			glFrontFace((++flip & 1) ? GL_CW : GL_CCW);
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'C':
nuclear@0: 		{
nuclear@0: 			static int cull = 1;
nuclear@0: 			if(++cull & 1) {
nuclear@0: 				glEnable(GL_CULL_FACE);
nuclear@0: 			} else {
nuclear@0: 				glDisable(GL_CULL_FACE);
nuclear@0: 			}
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'w':
nuclear@0: 		{
nuclear@0: 			static int wire;
nuclear@0: 			glPolygonMode(GL_FRONT_AND_BACK, (++wire & 1) ? GL_LINE : GL_FILL);
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'l':
nuclear@0: 		{
nuclear@0: 			static int lit = 1;
nuclear@0: 			if(++lit & 1) {
nuclear@0: 				glEnable(GL_LIGHTING);
nuclear@0: 			} else {
nuclear@0: 				glDisable(GL_LIGHTING);
nuclear@0: 			}
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case ' ':
nuclear@0: 		auto_rot = !auto_rot;
nuclear@0: 		if(auto_rot) {
nuclear@0: 			glutIdleFunc(glutPostRedisplay);
nuclear@0: 		} else {
nuclear@0: 			glutIdleFunc(0);
nuclear@0: 		}
nuclear@0: 		glutPostRedisplay();
nuclear@0: 		break;
nuclear@0: 
nuclear@5: 	case 'f':
nuclear@5: 		{
nuclear@5: 			static int fullscr;
nuclear@5: 			if(++fullscr & 1) {
nuclear@5: 				glutFullScreen();
nuclear@5: 			} else {
nuclear@5: 				glutPositionWindow(20, 20);
nuclear@5: 			}
nuclear@5: 		}
nuclear@5: 		break;
nuclear@5: 
nuclear@5: 		{
nuclear@5: 			static float bgval;
nuclear@5: 	case '=':
nuclear@5: 			bgval += 0.1;
nuclear@5: 			if(bgval > 1.0)
nuclear@5: 				bgval = 1.0;
nuclear@5: 			glClearColor(bgval, bgval, bgval, 1.0);
nuclear@5: 			glutPostRedisplay();
nuclear@5: 			break;
nuclear@5: 
nuclear@5: 	case '-':
nuclear@5: 			bgval -= 0.1;
nuclear@5: 			if(bgval < 0.0)
nuclear@5: 				bgval = 0.0;
nuclear@5: 			glClearColor(bgval, bgval, bgval, 1.0);
nuclear@5: 			glutPostRedisplay();
nuclear@5: 			break;
nuclear@5: 		}
nuclear@5: 
nuclear@0: 	default:
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void keyb_up(unsigned char key, int x, int y)
nuclear@0: {
nuclear@0: 	switch(key) {
nuclear@0: 	case 's':
nuclear@0: 		stereo_shift_key = 0;
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	default:
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: static int bnstate[32];
nuclear@0: static int prev_x, prev_y;
nuclear@0: void mouse(int bn, int state, int x, int y)
nuclear@0: {
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: 	bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN ? 1 : 0;
nuclear@0: }
nuclear@0: 
nuclear@0: 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(stereo_shift_key && dy != 0) {
nuclear@0: 		stereo_focus_dist += dy * 0.1;
nuclear@0: 		stereo_eye_sep = stereo_focus_dist / 30.0;
nuclear@0: 		glutPostRedisplay();
nuclear@0: 		return;
nuclear@0: 	}
nuclear@0: 
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)
nuclear@0: 			cam_phi = -90;
nuclear@0: 		if(cam_phi > 90)
nuclear@0: 			cam_phi = 90;
nuclear@0: 
nuclear@0: 		glutPostRedisplay();
nuclear@0: 	}
nuclear@0: 	if(bnstate[2]) {
nuclear@0: 		cam_dist += dy * 0.1;
nuclear@0: 		glutPostRedisplay();
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void sball_motion(int x, int y, int z)
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: void sball_rotate(int x, int y, int z)
nuclear@0: {
nuclear@0: 	cam_theta += y * 0.05;
nuclear@0: 	cam_phi += x * 0.05;
nuclear@0: 
nuclear@0: 	if(cam_phi < -90)
nuclear@0: 		cam_phi = -90;
nuclear@0: 	if(cam_phi > 90)
nuclear@0: 		cam_phi = 90;
nuclear@0: 
nuclear@0: 	glutPostRedisplay();
nuclear@0: }
nuclear@0: 
nuclear@0: void sball_button(int bn, int state)
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: int parse_args(int argc, char **argv)
nuclear@0: {
nuclear@8: 	int i, num_loaded = 0;
nuclear@0: 
nuclear@0: 	for(i=1; i<argc; i++) {
nuclear@0: 		if(argv[i][0] == '-') {
nuclear@0: 			if(argv[i][2] != 0)
nuclear@0: 				goto inval;
nuclear@0: 			switch(argv[i][1]) {
nuclear@0: 			case 's':
nuclear@0: 				stereo = 1;
nuclear@0: 				break;
nuclear@0: 
nuclear@0: 			case 'c':
nuclear@0: 				flip_winding = 1;
nuclear@0: 				break;
nuclear@0: 
nuclear@3: 			case 'v':
nuclear@3: 				verbose = !verbose;
nuclear@3: 				break;
nuclear@3: 
nuclear@0: 			default:
nuclear@0: 				goto inval;
nuclear@0: 			}
nuclear@0: 		} else {
nuclear@8: 			if((load_scene(&scn, argv[i])) == -1) {
nuclear@8: 				fprintf(stderr, "failed to load: %s\n", argv[1]);
nuclear@0: 				return -1;
nuclear@0: 			}
nuclear@8: 			num_loaded++;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@8: 	if(num_loaded == 0) {
nuclear@0: 		fprintf(stderr, "you must pass the filename of a scene to open\n");
nuclear@0: 		return -1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	return 0;
nuclear@0: 
nuclear@0: inval:
nuclear@0: 	fprintf(stderr, "invalid argument: %s\n", argv[i]);
nuclear@0: 	return -1;
nuclear@0: }