Add clipping planes to the scene

include/rasteriser/rasteriser.h

@@ -51,11 +51,21 @@ typedef struct {
   transform_t transform;
 } instance_t;
 
+typedef struct {
+  vec3f_t normal;
+  f32 distance;
+} clipping_plane_t;
+
 typedef struct {
   u64 instance_count;
   instance_t *instances;
   camera_t *camera;
   const mat3x4f_t *proj_matrix;
+  clipping_plane_t near;
+  clipping_plane_t left;
+  clipping_plane_t right;
+  clipping_plane_t bottom;
+  clipping_plane_t top;
 } rasteriser_scene_t;
 
 void render_scene(window_t *wnd, Arena *arena, const rasteriser_scene_t *scene);