Switch to using transformation matrices

include/rasteriser/rasteriser.h

@@ -41,12 +41,18 @@ typedef struct {
 } model_t;
 
 typedef struct {
-  model_t *model;
+  f32 scale;
+  vec3f_t rotation;
   vec3f_t position;
+} transform_t;
+
+typedef struct {
+  model_t *model;
+  transform_t transform;
 } instance_t;
 
-void render_instance(window_t *wnd, Arena *arena, const camera_t *camera,
-                     vec3f_t viewport, const instance_t *instance_t);
+void render_instance(window_t *wnd, Arena *arena, mat3x4f_t proj_cam_mat,
+                     const instance_t *instance);
 void draw_wireframe_triangle(window_t *wnd, Arena *arena, triangle_t triangle);
 void draw_filled_triangle(window_t *wnd, Arena *arena, triangle_t triangle);
 void draw_shaded_triangle(window_t *wnd, Arena *arena, triangle_t triangle);