nuclear@16: #include <stdio.h>
nuclear@16: #include <stdlib.h>
nuclear@16: #include <algorithm>
nuclear@16: #include <goat3dgfx/goat3dgfx.h>
nuclear@16: #include <vmath/vmath.h>
nuclear@16: 
nuclear@16: using namespace goatgfx;
nuclear@16: 
nuclear@16: static bool init();
nuclear@16: static void cleanup();
nuclear@16: static void display();
nuclear@16: static void reshape(int x, int y);
nuclear@16: static void keyboard(unsigned char key, int x, int y);
nuclear@16: static void mouse(int bn, int st, int x, int y);
nuclear@16: static void motion(int x, int y);
nuclear@16: static bool parse_args(int argc, char **argv);
nuclear@16: 
nuclear@16: static float cam_theta, cam_phi;
nuclear@16: static const char *scene_filename;
nuclear@16: static Scene *scn;
nuclear@16: 
nuclear@16: int main(int argc, char **argv)
nuclear@16: {
nuclear@16: 	glutInit(&argc, argv);
nuclear@16: 	glutInitWindowSize(800, 600);
nuclear@16: 	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@16: 	glutCreateWindow("viewscn");
nuclear@16: 
nuclear@16: 	glutDisplayFunc(display);
nuclear@16: 	glutReshapeFunc(reshape);
nuclear@16: 	glutKeyboardFunc(keyboard);
nuclear@16: 	glutMouseFunc(mouse);
nuclear@16: 	glutMotionFunc(motion);
nuclear@16: 
nuclear@16: 	if(!parse_args(argc, argv)) {
nuclear@16: 		return 1;
nuclear@16: 	}
nuclear@16: 
nuclear@16: 	if(!init()) {
nuclear@16: 		return 1;
nuclear@16: 	}
nuclear@16: 	atexit(cleanup);
nuclear@16: 
nuclear@16: 	glutMainLoop();
nuclear@16: 	return 0;
nuclear@16: }
nuclear@16: 
nuclear@16: static bool init()
nuclear@16: {
nuclear@16: 	glewInit();
nuclear@16: 
nuclear@16: 	glEnable(GL_DEPTH_TEST);
nuclear@16: 	glEnable(GL_CULL_FACE);
nuclear@16: 
nuclear@16: 	scn = new Scene;
nuclear@16: 	if(!scn->load(scene_filename)) {
nuclear@16: 		fatal_log("failed to load scene: %s\n", scene_filename);
nuclear@16: 		return false;
nuclear@16: 	}
nuclear@16: 
nuclear@16: 	return true;
nuclear@16: }
nuclear@16: 
nuclear@16: static void cleanup()
nuclear@16: {
nuclear@16: 	delete scn;
nuclear@16: }
nuclear@16: 
nuclear@16: static void display()
nuclear@16: {
nuclear@16: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@16: 
nuclear@16: 	Matrix4x4 view_matrix;
nuclear@16: 	view_matrix.rotate(Vector3(1, 0, 0), M_PI * cam_phi / 180.0);
nuclear@16: 	view_matrix.rotate(Vector3(0, 1, 0), M_PI * cam_theta / 180.0);
nuclear@16: 	set_view_matrix(view_matrix);
nuclear@16: 
nuclear@16: 	setup_gl_matrices();
nuclear@16: 
nuclear@16: 	scn->draw();
nuclear@16: 
nuclear@16: 	glutSwapBuffers();
nuclear@16: 	CHECKGLERR;
nuclear@16: }
nuclear@16: 
nuclear@16: static void reshape(int x, int y)
nuclear@16: {
nuclear@16: 	glViewport(0, 0, x, y);
nuclear@16: 
nuclear@16: 	Matrix4x4 proj;
nuclear@16: 	proj.set_perspective(M_PI / 4.0, (float)x / (float)y, 0.5, 500.0);
nuclear@16: 	set_projection_matrix(proj);
nuclear@16: }
nuclear@16: 
nuclear@16: static void keyboard(unsigned char key, int x, int y)
nuclear@16: {
nuclear@16: 	switch(key) {
nuclear@16: 	case 27:
nuclear@16: 		exit(0);
nuclear@16: 	}
nuclear@16: }
nuclear@16: 
nuclear@16: static bool bnstate[16];
nuclear@16: static int prev_x, prev_y;
nuclear@16: 
nuclear@16: static void mouse(int bn, int st, int x, int y)
nuclear@16: {
nuclear@16: 	bnstate[bn - GLUT_LEFT_BUTTON] = st == GLUT_DOWN;
nuclear@16: 	prev_x = x;
nuclear@16: 	prev_y = y;
nuclear@16: }
nuclear@16: 
nuclear@16: static void motion(int x, int y)
nuclear@16: {
nuclear@16: 	int dx = x - prev_x;
nuclear@16: 	int dy = y - prev_y;
nuclear@16: 	prev_x = x;
nuclear@16: 	prev_y = y;
nuclear@16: 
nuclear@16: 	if(!dx && !dy) return;
nuclear@16: 
nuclear@16: 	if(bnstate[0]) {
nuclear@16: 		cam_theta += dx * 0.5;
nuclear@16: 		cam_phi += dy * 0.5;
nuclear@16: 		cam_phi = std::max(-90.0f, std::min(90.0f, cam_phi));
nuclear@16: 		glutPostRedisplay();
nuclear@16: 	}
nuclear@16: }
nuclear@16: 
nuclear@16: static bool parse_args(int argc, char **argv)
nuclear@16: {
nuclear@16: 	for(int i=1; i<argc; i++) {
nuclear@16: 		if(argv[i][0] == '-' && argv[i][2] == 0) {
nuclear@16: 			switch(argv[i][1]) {
nuclear@16: 			case 'h':
nuclear@16: 			default:
nuclear@16: 				printf("usage: %s <filename>\n", argv[i]);
nuclear@16: 				exit(0);
nuclear@16: 			}
nuclear@16: 		} else {
nuclear@16: 			if(scene_filename) {
nuclear@16: 				fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@16: 				return false;
nuclear@16: 			}
nuclear@16: 			scene_filename = argv[i];
nuclear@16: 		}
nuclear@16: 	}
nuclear@16: 
nuclear@16: 	if(!scene_filename) {
nuclear@16: 		fprintf(stderr, "you must specify the scene file to view\n");
nuclear@16: 		return false;
nuclear@16: 	}
nuclear@16: 
nuclear@16: 	return true;
nuclear@16: }