Initial implementation of bounding sphere clipping

include/rasteriser/rasteriser.h

@@ -40,6 +40,8 @@ typedef struct {
   list_vec3f_t *vertices;
   list_scene_triangle_t *triangles;
 } model_t;
+#define NULL_MODEL ((model_t){0})
+#define IS_NULL_MODEL(MODEL) (MODEL.vertices == NULL && MODEL.triangles == NULL)
 
 typedef struct {
   f32 scale;
@@ -47,6 +49,11 @@ typedef struct {
   vec3f_t position;
 } transform_t;
 
+typedef struct {
+  vec3f_t centre;
+  f32 radius;
+} bounding_sphere_t;
+
 typedef struct {
   model_t *model;
   transform_t transform;
@@ -57,21 +64,16 @@ typedef struct {
   f32 distance;
 } clipping_plane_t;
 
+#define CLIPPING_PLANE_COUNT 5
 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;
+  clipping_plane_t planes[CLIPPING_PLANE_COUNT];
 } rasteriser_scene_t;
 
 void render_scene(window_t *wnd, Arena *arena, const rasteriser_scene_t *scene);
-void render_instance(window_t *wnd, Arena *arena, mat4x4f_t camera_matrix,
-                     mat3x4f_t projection_matrix, 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);