Implement Vector4, Vector4i, Projection

Implement built-in classes Vector4, Vector4i and Projection.

* Two versions of Vector4 (float and integer).
* A Projection class, which is a 4x4 matrix specialized in projection types.

These types have been requested for a long time, but given they were very corner case they were not added before.
Because in Godot 4, reimplementing parts of the rendering engine is now possible, access to these types (heavily used by the rendering code) becomes a necessity.

**Q**: Why Projection and not Matrix4?
**A**: Godot does not use Matrix2, Matrix3, Matrix4x3, etc. naming convention because, within the engine, these types always have a *purpose*. As such, Godot names them: Transform2D, Transform3D or Basis. In this case, this 4x4 matrix is _always_ used as a _Projection_, hence the naming.

1 files changed, 3 insertions, 3 deletions

diff --git a/servers/rendering/renderer_scene_occlusion_cull.h b/servers/rendering/renderer_scene_occlusion_cull.h
index 7198379ade..47d38f1780 100644
--- a/servers/rendering/renderer_scene_occlusion_cull.h
+++ b/servers/rendering/renderer_scene_occlusion_cull.h
@@ -31,7 +31,7 @@
 #ifndef RENDERER_SCENE_OCCLUSION_CULL_H
 #define RENDERER_SCENE_OCCLUSION_CULL_H
 
-#include "core/math/camera_matrix.h"
+#include "core/math/projection.h"
 #include "core/templates/local_vector.h"
 #include "servers/rendering_server.h"
 
@@ -60,7 +60,7 @@ public:
 
 		void update_mips();
 
-		_FORCE_INLINE_ bool is_occluded(const real_t p_bounds[6], const Vector3 &p_cam_position, const Transform3D &p_cam_inv_transform, const CameraMatrix &p_cam_projection, real_t p_near) const {
+		_FORCE_INLINE_ bool is_occluded(const real_t p_bounds[6], const Vector3 &p_cam_position, const Transform3D &p_cam_inv_transform, const Projection &p_cam_projection, real_t p_near) const {
 			if (is_empty()) {
 				return false;
 			}
@@ -183,7 +183,7 @@ public:
 	}
 	virtual void buffer_set_scenario(RID p_buffer, RID p_scenario) { _print_warning(); }
 	virtual void buffer_set_size(RID p_buffer, const Vector2i &p_size) { _print_warning(); }
-	virtual void buffer_update(RID p_buffer, const Transform3D &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, ThreadWorkPool &p_thread_pool) {}
+	virtual void buffer_update(RID p_buffer, const Transform3D &p_cam_transform, const Projection &p_cam_projection, bool p_cam_orthogonal, ThreadWorkPool &p_thread_pool) {}
 	virtual RID buffer_get_debug_texture(RID p_buffer) {
 		_print_warning();
 		return RID();