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, 5 insertions, 5 deletions

diff --git a/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp b/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
index b8ad4e4511..cf749854e2 100644
--- a/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
@@ -1584,7 +1584,7 @@ void RendererCanvasRenderRD::light_update_shadow(RID p_rid, int p_shadow_index,
 		RD::InitialAction initial_action = i == 0 ? RD::INITIAL_ACTION_CLEAR_REGION : RD::INITIAL_ACTION_CLEAR_REGION_CONTINUE;
 		RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(state.shadow_fb, initial_action, i != 3 ? RD::FINAL_ACTION_CONTINUE : RD::FINAL_ACTION_READ, initial_action, RD::FINAL_ACTION_DISCARD, cc, 1.0, 0, rect);
 
-		CameraMatrix projection;
+		Projection projection;
 		{
 			real_t fov = 90;
 			real_t nearp = p_near;
@@ -1600,7 +1600,7 @@ void RendererCanvasRenderRD::light_update_shadow(RID p_rid, int p_shadow_index,
 		}
 
 		Vector3 cam_target = Basis(Vector3(0, 0, Math_TAU * ((i + 3) / 4.0))).xform(Vector3(0, 1, 0));
-		projection = projection * CameraMatrix(Transform3D().looking_at(cam_target, Vector3(0, 0, -1)).affine_inverse());
+		projection = projection * Projection(Transform3D().looking_at(cam_target, Vector3(0, 0, -1)).affine_inverse());
 
 		ShadowRenderPushConstant push_constant;
 		for (int y = 0; y < 4; y++) {
@@ -1673,9 +1673,9 @@ void RendererCanvasRenderRD::light_update_directional_shadow(RID p_rid, int p_sh
 	Rect2i rect(0, p_shadow_index * 2, state.shadow_texture_size, 2);
 	RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(state.shadow_fb, RD::INITIAL_ACTION_CLEAR_REGION, RD::FINAL_ACTION_READ, RD::INITIAL_ACTION_CLEAR_REGION, RD::FINAL_ACTION_DISCARD, cc, 1.0, 0, rect);
 
-	CameraMatrix projection;
+	Projection projection;
 	projection.set_orthogonal(-half_size, half_size, -0.5, 0.5, 0.0, distance);
-	projection = projection * CameraMatrix(Transform3D().looking_at(Vector3(0, 1, 0), Vector3(0, 0, -1)).affine_inverse());
+	projection = projection * Projection(Transform3D().looking_at(Vector3(0, 1, 0), Vector3(0, 0, -1)).affine_inverse());
 
 	ShadowRenderPushConstant push_constant;
 	for (int y = 0; y < 4; y++) {
@@ -1743,7 +1743,7 @@ void RendererCanvasRenderRD::render_sdf(RID p_render_target, LightOccluderInstan
 
 	RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(fb, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_READ, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_DISCARD, cc);
 
-	CameraMatrix projection;
+	Projection projection;
 
 	ShadowRenderPushConstant push_constant;
 	for (int y = 0; y < 4; y++) {