From 4628b7d831b694d8fedf9673f0c58c5795a120bd Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Tue, 17 Feb 2026 07:02:15 -0600
Subject: [PATCH] feat(ui): add CSimpleCamera::SetGxProjectionAndView

---
 src/ui/simple/CSimpleCamera.cpp | 20 ++++++++++++++++++++
 src/ui/simple/CSimpleCamera.hpp |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/src/ui/simple/CSimpleCamera.cpp b/src/ui/simple/CSimpleCamera.cpp
index 0164145..8a35c2f 100644
--- a/src/ui/simple/CSimpleCamera.cpp
+++ b/src/ui/simple/CSimpleCamera.cpp
@@ -1,4 +1,5 @@
 #include "ui/simple/CSimpleCamera.hpp"
+#include "gx/Transform.hpp"
 #include "model/Model2.hpp"
 #include <tempest/Math.hpp>
 
@@ -107,6 +108,25 @@ void CSimpleCamera::SetNearZ(float nearZ) {
     this->m_nearZ = nearZ;
 }
 
+void CSimpleCamera::SetGxProjectionAndView(const CRect& projRect) {
+    // Projection
+
+    this->m_aspect = (projRect.maxX - projRect.minX) / (projRect.maxY - projRect.minY);
+
+    C44Matrix projMat;
+    GxuXformCreateProjection_Exact(this->m_fov * 0.6f, this->m_aspect, this->m_nearZ, this->m_farZ, projMat);
+
+    GxXformSetProjection(projMat);
+
+    // View
+
+    C3Vector eye;
+    C44Matrix viewMat;
+    GxuXformCreateLookAtSgCompat(eye, this->Forward(), this->Up(), viewMat);
+
+    GxXformSetView(viewMat);
+}
+
 C3Vector CSimpleCamera::Up() const {
     return { this->m_facing.c0, this->m_facing.c1, this->m_facing.c2 };
 }
diff --git a/src/ui/simple/CSimpleCamera.hpp b/src/ui/simple/CSimpleCamera.hpp
index 2f2fdda..e39cea6 100644
--- a/src/ui/simple/CSimpleCamera.hpp
+++ b/src/ui/simple/CSimpleCamera.hpp
@@ -2,6 +2,7 @@
 #define UI_SIMPLE_C_SIMPLE_CAMERA_HPP
 
 #include <tempest/Matrix.hpp>
+#include <tempest/Rect.hpp>
 #include <tempest/Vector.hpp>
 
 class CM2Scene;
@@ -22,6 +23,7 @@ class CSimpleCamera {
         void SetFacing(float yaw, float pitch, float roll);
         void SetFarZ(float farZ);
         void SetFieldOfView(float fov);
+        void SetGxProjectionAndView(const CRect& projRect);
         void SetNearZ(float nearZ);
 
     protected: