Asset processor, got rid of stb image in the program

obj.cpp

@@ -0,0 +1,86 @@
+///
+/// [?] - Cache bitmaps
+/// [ ] - Fix potential portability issues due to compiler struct alignment differences etc.
+///
+
+struct Obj_Index {
+  int vertex[3];
+  int tex[3];
+  int normal[3];
+  S32 material_id;
+  S32 smoothing_group_id;
+};
+
+struct Obj_Mesh {
+  char name[64];
+  Array<Obj_Index> indices;
+};
+
+struct Obj_Material {
+  char name[64];
+  U32  name_len;
+  Bitmap texture_ambient; // map_Ka
+  Bitmap texture_diffuse; // map_Kd
+  Bitmap texture_dissolve; // map_d
+  Bitmap texture_displacement; // map_Disp
+  F32 non_transparency; // d
+  F32 transparency; // Tr
+  F32 optical_density; // Ni
+  F32 shininess; // Ns
+  S32 illumination_model; // illum 
+  Vec3 ambient_color; // Ka
+  Vec3 diffuse_color; // Kd
+  Vec3 specular_color; // Ks
+};
+
+struct Obj {
+  String name;
+  Array<Vec3> vertices;
+  Array<Vec2> texture_coordinates;
+  Array<Vec3> normals;
+  Array<Obj_Mesh> mesh;
+  Array<Obj_Material> materials;
+};
+
+struct Stream{
+  U8 *cursor;
+  U8 *end;
+};
+
+#define stream_read_array(s,T,c) (T *)stream_read(s,sizeof(T)*(c))
+#define stream_read_struct(s,T) stream_read_array(s,T,1)
+function void *
+stream_read(Stream *s, SizeU size){
+  U8 *result = s->cursor;
+  s->cursor += size;
+  assert(s->end >= s->cursor);
+  return result;
+}
+
+function Obj *
+load_obj_dump(Allocator *allocator, String filename){
+  String string = os_read_file(allocator, filename);
+  
+  Obj *obj = (Obj *)string.str;
+  Stream stream = {(U8 *)(obj+1), string.str + string.len};
+  obj->name.str = stream_read_array(&stream, U8, obj->name.len);
+  obj->vertices.data = stream_read_array(&stream, Vec3, obj->vertices.len);
+  obj->texture_coordinates.data = stream_read_array(&stream, Vec2, obj->texture_coordinates.len);
+  obj->normals.data = stream_read_array(&stream, Vec3, obj->normals.len);
+  obj->mesh.data = stream_read_array(&stream, Obj_Mesh, obj->mesh.len);
+  obj->materials.data = stream_read_array(&stream, Obj_Material, obj->materials.len);
+  
+  Iter(obj->mesh){
+    it->indices.data = stream_read_array(&stream, Obj_Index, it->indices.len);
+  }
+  
+  Iter(obj->materials){
+    it->texture_ambient.pixels = stream_read_array(&stream, U32, it->texture_ambient.x*it->texture_ambient.y);
+    it->texture_diffuse.pixels = stream_read_array(&stream, U32, it->texture_diffuse.x*it->texture_diffuse.y);
+    it->texture_dissolve.pixels = stream_read_array(&stream, U32, it->texture_dissolve.x*it->texture_dissolve.y);
+    it->texture_displacement.pixels = stream_read_array(&stream, U32, it->texture_displacement.x*it->texture_displacement.y);
+  }
+  
+  return obj;
+}
+