From de9c5d510175bba11ab8704e67be3a3a94f9149e Mon Sep 17 00:00:00 2001
From: MegaMech <MegaMech@users.noreply.github.com>
Date: Sun, 9 Nov 2025 19:07:44 -0700
Subject: Implement SpawnParams struct (#536)

* Impl SpawnParams

* Added json submodule

* Update json

* Update

* Works

* Remove comment

* Works refactor

* Snowman and thwomp working

* Impl hot air balloon

* More progress

* All OObjects are done

* cleanup

* Refactor 2Dpath to normal path

* Update nlohmann json & fix compile

* Rest of actors

* MORE CHANGES

* Finish actors

* Done PR, some fix to collision viewer

* Impl falling rocks

* Add const

* wip editor refactor

* Property work

* continue

* Overridable editor properties

* Actor saving/loading works now

* Fix light alignment

* Clarification

* Impl penguin

* params impl signs

* properties impl falling rock

* More property impls

* impl air balloon

* Add spawnParams to OObject Translate

* Snowman translate better

* impl hedgehog properly

* properties impl trophy

* thwomp progress

* Finish impl properties

* Fix compile

* Fix cursor collisions

* Move registered actors

* Rename pathPoint XYZ to xyz

* Fix editor pause bug

* Clean up

* Review comments

* Remove SpawnParams struct from actor classes

* Rename

* Player Label First Iteration

* Work now

* Working 3d text

* Fix boo bug

* Finish AText actor

* Fix spawnparams compile

* Register AText

* Finish Text Actor

* Fix thwomp interpolation

* Fix compile

* Fix crab and hedgehog

* Fix loading flagpole

* Fix Hot Air Balloon

* Turn zbuffer on for AText

* Update

---------

Co-authored-by: MegaMech <7255464+MegaMech@users.noreply.github.com>
---
 src/engine/Matrix.cpp | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

(limited to 'src/engine/Matrix.cpp')

diff --git a/src/engine/Matrix.cpp b/src/engine/Matrix.cpp
index 954b0fd90..44a9a1799 100644
--- a/src/engine/Matrix.cpp
+++ b/src/engine/Matrix.cpp
@@ -119,6 +119,56 @@ void ApplyMatrixTransformations(Mat4 mtx, FVector pos, IRotator rot, FVector sca
     mtx[3][3] = 1.0f;
 }
 
+/* 
+ * Spherical billboarding
+ * Rotates the object to face the camera
+ * Rotates on all three axis
+ */
+void ApplySphericalBillBoard(Mat4 mat, FVector pos, FVector scale, s32 cameraIndex) {
+    Mtx* lookAt = GetLookAtMatrix(cameraIndex);
+    Mat4 lookAtF;
+    guMtxL2F((float(*)[4])&lookAtF, lookAt);
+
+    // Camera Right
+    mat[0][0] = lookAtF[0][0];
+    mat[1][0] = lookAtF[0][1];
+    mat[2][0] = lookAtF[0][2];
+    mat[3][0] = 0;
+
+    // Camera Up
+    mat[0][1] = lookAtF[1][0];
+    mat[1][1] = lookAtF[1][1];
+    mat[2][1] = lookAtF[1][2];
+    mat[3][1] = 0;
+
+    // Camera Forward
+    mat[0][2] = lookAtF[2][0];
+    mat[1][2] = lookAtF[2][1];
+    mat[2][2] = lookAtF[2][2];
+    mat[3][2] = 0;
+
+    mat[0][3] = 0;
+    mat[1][3] = 0;
+    mat[2][3] = 0;
+    mat[3][3] = 1;
+
+    // Set position
+    mat[3][0] = pos.x;
+    mat[3][1] = pos.y;
+    mat[3][2] = pos.z;
+
+    // Apply scaling
+    mat[0][0] *= scale.x;
+    mat[1][0] *= scale.x;
+    mat[2][0] *= scale.x;
+    mat[0][1] *= scale.y;
+    mat[1][1] *= scale.y;
+    mat[2][1] *= scale.y;
+    mat[0][2] *= scale.z;
+    mat[1][2] *= scale.z;
+    mat[2][2] *= scale.z;
+}
+
 void AddLocalRotation(Mat4 mat, IRotator rot) {
     f32 sin_pitch = sins(rot.pitch);
     f32 cos_pitch = coss(rot.pitch);
@@ -141,7 +191,6 @@ void AddLocalRotation(Mat4 mat, IRotator rot) {
     mat[2][2] = (cos_pitch * cos_yaw);
 }
 
-
 // API
 extern "C" {
 
-- 
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