Add rasteriser_scene_t struct and render_scene function

include/rasteriser/rasteriser.h

@@ -51,6 +51,14 @@ typedef struct {
   transform_t transform;
 } instance_t;
 
+typedef struct {
+  u64 instance_count;
+  instance_t *instances;
+  camera_t *camera;
+  const mat3x4f_t *proj_matrix;
+} rasteriser_scene_t;
+
+void render_scene(window_t *wnd, Arena *arena, const rasteriser_scene_t *scene);
 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);