nuclear@3: #include <stdlib.h>
nuclear@5: #include <assert.h>
nuclear@3: #include "opengl.h"
nuclear@0: #include "mesh.h"
nuclear@0: #include "objfile.h"
nuclear@0: 
nuclear@5: static struct vec3 def_verts[] = {
nuclear@5: 	{-1, -1, 1}, {1, -1, 1}, {1, 1, 1},		{-1, -1, 1}, {1, 1, 1}, {-1, 1, 1},
nuclear@5: 	{1, -1, 1}, {1, -1, -1}, {1, 1, -1},	{1, -1, 1}, {1, 1, -1}, {1, 1, 1},
nuclear@5: 	{1, -1, -1}, {-1, -1, -1}, {-1, 1, -1},	{1, -1, -1}, {-1, 1, -1}, {1, 1, -1},
nuclear@5: 	{-1, -1, -1}, {-1, -1, 1}, {-1, 1, 1},	{-1, -1, -1}, {-1, 1, 1}, {-1, 1, -1}
nuclear@5: };
nuclear@5: #define FACEATTR(x, y, z)	{x, y, z}, {x, y, z}, {x, y, z}, {x, y, z}, {x, y, z}, {x, y, z}
nuclear@5: static struct vec3 def_norm[] = {
nuclear@5: 	FACEATTR(0, 0, 1),
nuclear@5: 	FACEATTR(1, 0, 0),
nuclear@5: 	FACEATTR(0, 0, -1),
nuclear@5: 	FACEATTR(-1, 0, 0)
nuclear@5: };
nuclear@5: static struct vec3 def_tc[] = {
nuclear@5: 	{0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0},
nuclear@5: 	{0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0},
nuclear@5: 	{0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0},
nuclear@5: 	{0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0}
nuclear@5: };
nuclear@5: 
nuclear@5: static struct mesh def_mesh = {
nuclear@5: 	def_verts, def_norm, def_tc,
nuclear@5: 	sizeof def_verts / sizeof *def_verts
nuclear@5: };
nuclear@5: 
nuclear@0: /* use objfile to load mesh data (vertices, normals, and texcoords)
nuclear@0:  * from a wavefront|OBJ file.
nuclear@0:  */
nuclear@0: struct mesh *load_mesh(const char *fname)
nuclear@0: {
nuclear@0: 	int i;
nuclear@0: 	struct mesh *m;
nuclear@0: 	struct objfile *obj;
nuclear@0: 
nuclear@0: 	if(!(obj = objf_load(fname))) {
nuclear@5: 		return &def_mesh;
nuclear@0: 	}
nuclear@0: 	m = malloc(sizeof *m);
nuclear@0: 	m->num_verts = objf_vertex_count(obj);
nuclear@0: 
nuclear@0: 	m->vert = malloc(m->num_verts * sizeof *m->vert);
nuclear@0: 	m->norm = malloc(m->num_verts * sizeof *m->norm);
nuclear@0: 	m->tc = malloc(m->num_verts * sizeof *m->tc);
nuclear@0: 
nuclear@0: 	for(i=0; i<m->num_verts; i++) {
nuclear@0: 		float *v = objf_vertex(obj, i);
nuclear@0: 		float *n = objf_normal(obj, i);
nuclear@0: 		float *t = objf_texcoord(obj, i);
nuclear@0: 
nuclear@0: 		m->vert[i].x = v[0];
nuclear@0: 		m->vert[i].y = v[1];
nuclear@0: 		m->vert[i].z = v[2];
nuclear@0: 
nuclear@0: 		m->norm[i].x = n[0];
nuclear@0: 		m->norm[i].y = n[1];
nuclear@0: 		m->norm[i].z = n[2];
nuclear@0: 
nuclear@0: 		m->tc[i].x = t[0];
nuclear@0: 		m->tc[i].y = t[1];
nuclear@0: 	}
nuclear@0: 	objf_free(obj);
nuclear@0: 	return m;
nuclear@0: }
nuclear@0: 
nuclear@0: void free_mesh(struct mesh *m)
nuclear@0: {
nuclear@5: 	if(m && m != &def_mesh) {
nuclear@0: 		free(m->vert);
nuclear@0: 		free(m->norm);
nuclear@0: 		free(m->tc);
nuclear@0: 		free(m);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void render_mesh(struct mesh *m)
nuclear@0: {
nuclear@0: 	glEnableClientState(GL_VERTEX_ARRAY);
nuclear@0: 	glEnableClientState(GL_NORMAL_ARRAY);
nuclear@0: 	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@0: 
nuclear@0: 	glVertexPointer(3, GL_FLOAT, 0, m->vert);
nuclear@0: 	glNormalPointer(GL_FLOAT, 0, m->norm);
nuclear@0: 	glTexCoordPointer(2, GL_FLOAT, 0, m->tc);
nuclear@0: 
nuclear@0: 	glDrawArrays(GL_TRIANGLES, 0, m->num_verts);
nuclear@0: 
nuclear@0: 	glDisableClientState(GL_VERTEX_ARRAY);
nuclear@0: 	glDisableClientState(GL_NORMAL_ARRAY);
nuclear@0: 	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@0: }