Split obj loading and model rendering code

src/model/obj.h

@@ -0,0 +1,41 @@
+#ifndef OBJ_H
+#define OBJ_H
+
+#include "aliases.h"
+#include "img.h"
+#include "mem_arena.h"
+#include "typed_list.h"
+#include "vec.h"
+
+#define INVALID_MODEL ((Model){0})
+#define IS_INVALID_MODEL(m) (m.vertices == NULL || m.triangles == NULL)
+
+typedef struct triangle Triangle;
+struct triangle {
+  u64 p0;
+  u64 p1;
+  u64 p2;
+  u64 n0;
+  u64 n1;
+  u64 n2;
+  u64 tx0;
+  u64 tx1;
+  u64 tx2;
+};
+
+MAKE_LIST_TYPE(Triangle);
+
+typedef struct model Model;
+struct model {
+  LIST_TYPE(V3f) * vertices;
+  LIST_TYPE(V3f) * normals;
+  LIST_TYPE(V2f) * texture_coordinates;
+  LIST_TYPE(Triangle) * triangles;
+  Image *texture;
+  Image *normal;
+};
+
+Model load_obj_file(Arena *arena, const char *filename, const char *texture,
+                    const char *normal_map);
+
+#endif // OBJ_H