nuclear@19: #include <stdio.h>
nuclear@19: #include <stdlib.h>
nuclear@19: #include <assert.h>
nuclear@19: #ifndef __APPLE__
nuclear@19: #include <GL/glut.h>
nuclear@19: #else
nuclear@19: #include <GLUT/glut.h>
nuclear@19: #endif
nuclear@19: #include "goat3d.h"
nuclear@19: 
nuclear@19: static void cleanup(void);
nuclear@19: static void disp(void);
nuclear@19: static void draw_scene(struct goat3d *g);
nuclear@19: static void draw_mesh(struct goat3d_mesh *mesh);
nuclear@19: static void reshape(int x, int y);
nuclear@19: static void keyb(unsigned char key, int x, int y);
nuclear@19: static void mouse(int bn, int st, int x, int y);
nuclear@19: static void motion(int x, int y);
nuclear@19: 
nuclear@19: static struct goat3d *goat;
nuclear@19: static float cam_theta, cam_phi, cam_dist = 10;
nuclear@19: 
nuclear@19: int main(int argc, char **argv)
nuclear@19: {
nuclear@19: 	glutInitWindowSize(800, 600);
nuclear@19: 	glutInit(&argc, argv);
nuclear@19: 
nuclear@19: 	if(!argv[1]) {
nuclear@19: 		fprintf(stderr, "you must specify a goat3d scene file to open\n");
nuclear@19: 		return 1;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	if(!(goat = goat3d_create())) {
nuclear@19: 		fprintf(stderr, "failed to create goat3d\n");
nuclear@19: 		return 1;
nuclear@19: 	}
nuclear@19: 	if(goat3d_load(goat, argv[1]) == -1) {
nuclear@19: 		fprintf(stderr, "failed to load goat3d scene: %s\n", argv[1]);
nuclear@19: 		goat3d_free(goat);
nuclear@19: 		return 1;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@19: 	glutCreateWindow(argv[1]);
nuclear@19: 
nuclear@19: 	glutDisplayFunc(disp);
nuclear@19: 	glutReshapeFunc(reshape);
nuclear@19: 	glutKeyboardFunc(keyb);
nuclear@19: 	glutMouseFunc(mouse);
nuclear@19: 	glutMotionFunc(motion);
nuclear@19: 
nuclear@19: 	glEnable(GL_DEPTH_TEST);
nuclear@19: 	glEnable(GL_CULL_FACE);
nuclear@19: 	glEnable(GL_LIGHTING);
nuclear@19: 	glEnable(GL_LIGHT0);
nuclear@19: 
nuclear@19: 	glClearColor(0.1, 0.1, 0.1, 1.0);
nuclear@19: 
nuclear@19: 	atexit(cleanup);
nuclear@19: 
nuclear@19: 	glutMainLoop();
nuclear@19: 	return 0;
nuclear@19: }
nuclear@19: 
nuclear@19: static void cleanup(void)
nuclear@19: {
nuclear@19: 	goat3d_free(goat);
nuclear@19: }
nuclear@19: 
nuclear@19: static void disp(void)
nuclear@19: {
nuclear@19: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@19: 
nuclear@19: 	glMatrixMode(GL_MODELVIEW);
nuclear@19: 	glLoadIdentity();
nuclear@19: 	glTranslatef(0, 0, -cam_dist);
nuclear@19: 	glRotatef(cam_phi, 1, 0, 0);
nuclear@19: 	glRotatef(cam_theta, 0, 1, 0);
nuclear@19: 
nuclear@19: 	draw_scene(goat);
nuclear@19: 
nuclear@19: 	glutSwapBuffers();
nuclear@19: 	assert(glGetError() == GL_NO_ERROR);
nuclear@19: }
nuclear@19: 
nuclear@19: static void draw_scene(struct goat3d *g)
nuclear@19: {
nuclear@19: 	int i, num_meshes;
nuclear@19: 
nuclear@19: 	num_meshes = goat3d_get_mesh_count(g);
nuclear@19: 	for(i=0; i<num_meshes; i++) {
nuclear@19: 		struct goat3d_mesh *mesh = goat3d_get_mesh(g, i);
nuclear@19: 		draw_mesh(mesh);
nuclear@19: 	}
nuclear@19: }
nuclear@19: 
nuclear@19: static void draw_mesh(struct goat3d_mesh *mesh)
nuclear@19: {
nuclear@19: 	int vnum, fnum;
nuclear@19: 	struct goat3d_material *mtl;
nuclear@19: 	float *verts, *normals, *texcoords;
nuclear@19: 	int *vidx;
nuclear@19: 
nuclear@19: 	if((mtl = goat3d_get_mesh_mtl(mesh))) {
nuclear@19: 		/* TODO */
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	vnum = goat3d_get_mesh_attrib_count(mesh, GOAT3D_MESH_ATTR_VERTEX);
nuclear@19: 	fnum = goat3d_get_mesh_face_count(mesh);
nuclear@19: 
nuclear@19: 	if(!vnum || !fnum) {
nuclear@19: 		return;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	verts = goat3d_get_mesh_attribs(mesh, GOAT3D_MESH_ATTR_VERTEX);
nuclear@19: 	normals = goat3d_get_mesh_attribs(mesh, GOAT3D_MESH_ATTR_NORMAL);
nuclear@19: 	texcoords = goat3d_get_mesh_attribs(mesh, GOAT3D_MESH_ATTR_TEXCOORD);
nuclear@19: 	vidx = goat3d_get_mesh_faces(mesh);
nuclear@19: 
nuclear@19: 	glEnableClientState(GL_VERTEX_ARRAY);
nuclear@19: 	glVertexPointer(3, GL_FLOAT, 0, verts);
nuclear@19: 
nuclear@19: 	if(normals) {
nuclear@19: 		glEnableClientState(GL_NORMAL_ARRAY);
nuclear@19: 		glNormalPointer(GL_FLOAT, 0, normals);
nuclear@19: 	}
nuclear@19: 	if(texcoords) {
nuclear@19: 		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@19: 		glTexCoordPointer(2, GL_FLOAT, 0, texcoords);
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	glDrawElements(GL_TRIANGLES, fnum * 3, GL_UNSIGNED_INT, vidx);
nuclear@19: 
nuclear@19: 	glDisableClientState(GL_VERTEX_ARRAY);
nuclear@19: 	if(normals) {
nuclear@19: 		glDisableClientState(GL_NORMAL_ARRAY);
nuclear@19: 	}
nuclear@19: 	if(texcoords) {
nuclear@19: 		glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@19: 	}
nuclear@19: }
nuclear@19: 
nuclear@19: static void reshape(int x, int y)
nuclear@19: {
nuclear@19: 	glViewport(0, 0, x, y);
nuclear@19: 
nuclear@19: 	glMatrixMode(GL_PROJECTION);
nuclear@19: 	glLoadIdentity();
nuclear@19: 	gluPerspective(50.0, (float)x / (float)y, 0.5, 1000.0);
nuclear@19: }
nuclear@19: 
nuclear@19: static void keyb(unsigned char key, int x, int y)
nuclear@19: {
nuclear@19: 	switch(key) {
nuclear@19: 	case 27:
nuclear@19: 		exit(0);
nuclear@19: 	}
nuclear@19: }
nuclear@19: 
nuclear@19: static int bnstate[32];
nuclear@19: static int prev_x, prev_y;
nuclear@19: 
nuclear@19: static void mouse(int bn, int st, int x, int y)
nuclear@19: {
nuclear@19: 	bnstate[bn - GLUT_LEFT_BUTTON] = (st == GLUT_DOWN);
nuclear@19: 	prev_x = x;
nuclear@19: 	prev_y = y;
nuclear@19: }
nuclear@19: 
nuclear@19: static void motion(int x, int y)
nuclear@19: {
nuclear@19: 	int dx = x - prev_x;
nuclear@19: 	int dy = y - prev_y;
nuclear@19: 	prev_x = x;
nuclear@19: 	prev_y = y;
nuclear@19: 
nuclear@19: 	if(bnstate[0]) {
nuclear@19: 		cam_theta += dx * 0.5;
nuclear@19: 		cam_phi += dy * 0.5;
nuclear@19: 
nuclear@19: 		if(cam_phi < -90) cam_phi = -90;
nuclear@19: 		if(cam_phi > 90) cam_phi = 90;
nuclear@19: 		glutPostRedisplay();
nuclear@19: 	}
nuclear@19: 	if(bnstate[2]) {
nuclear@19: 		cam_dist += dy * 0.1;
nuclear@19: 
nuclear@19: 		if(cam_dist < 0) cam_dist = 0;
nuclear@19: 		glutPostRedisplay();
nuclear@19: 	}
nuclear@19: }