From d6ca9eda93fd6b1808e24fb647f0cc0f3d50f2e5 Mon Sep 17 00:00:00 2001
From: David Fioramonti
Date: Sat, 2 Sep 2017 05:38:50 -0700
Subject: TITANIC: Move Matrix4Inv out of starcamera and into FPose function

---
 engines/titanic/star_control/fpose.cpp       | 50 +++++++++++++++-------------
 engines/titanic/star_control/star_camera.cpp | 18 ++--------
 2 files changed, 30 insertions(+), 38 deletions(-)

diff --git a/engines/titanic/star_control/fpose.cpp b/engines/titanic/star_control/fpose.cpp
index 2bcb6c36f5..34a7a40d29 100644
--- a/engines/titanic/star_control/fpose.cpp
+++ b/engines/titanic/star_control/fpose.cpp
@@ -22,6 +22,7 @@
 
 #include "titanic/star_control/fpose.h"
 #include "titanic/star_control/matrix_transform.h"
+#include "titanic/star_control/matrix_inv.h"
 
 namespace Titanic {
 
@@ -159,29 +160,32 @@ void FPose::copyFrom(const FMatrix &src) {
 }
 
 FPose FPose::inverseTransform() const {
-	FPose result;
-
-	result._row1._x = _row1._x;
-	result._row2._x = _row1._y;
-	result._row3._x = _row1._z;
-	result._row1._y = _row2._x;
-	result._row2._y = _row2._y;
-	result._row3._y = _row2._z;
-	result._row1._z = _row3._x;
-	result._row2._z = _row3._y;
-	result._row3._z = _row3._z;
-
-	result._vector._x = -(_vector._x * result._row1._x
-		+ _vector._y * result._row2._x
-		+ _vector._z * result._row3._x);
-	result._vector._y = -(_vector._x * result._row1._y
-		+ _vector._y * result._row2._y
-		+ _vector._z * result._row3._y);
-	result._vector._z = -(_vector._x * result._row1._z
-		+ _vector._y * result._row2._z
-		+ _vector._z * result._row3._z);
-
-	return result;
+	FPose matrix_inv;
+
+	matrix_inv._row1._x = _row1._x;
+	matrix_inv._row2._x = _row1._y;
+	matrix_inv._row3._x = _row1._z;
+	matrix_inv._row1._y = _row2._x;
+	matrix_inv._row2._y = _row2._y;
+	matrix_inv._row3._y = _row2._z;
+	matrix_inv._row1._z = _row3._x;
+	matrix_inv._row2._z = _row3._y;
+	matrix_inv._row3._z = _row3._z;
+
+	float A[16]={_row1._x,_row1._y,_row1._z, 0.0,
+				 _row2._x,_row2._y,_row2._z, 0.0,
+				 _row3._x,_row3._y,_row3._z, 0.0,
+				 _vector._x,_vector._y,_vector._z, 1.0};
+	// Inverse matrix
+	float B[16]={};
+
+	// B contains inverse of A
+	matrix4Inverse<float>(A,B);	
+	matrix_inv._vector._x=B[12];
+	matrix_inv._vector._y=B[13];
+	matrix_inv._vector._z=B[14];
+
+	return matrix_inv;
 }
 
 //TODO: Check math and provide source
diff --git a/engines/titanic/star_control/star_camera.cpp b/engines/titanic/star_control/star_camera.cpp
index 9885f0ba04..a99d70276f 100644
--- a/engines/titanic/star_control/star_camera.cpp
+++ b/engines/titanic/star_control/star_camera.cpp
@@ -26,7 +26,7 @@
 #include "titanic/star_control/fmatrix.h"
 #include "titanic/star_control/fpoint.h"
 #include "titanic/star_control/marked_camera_mover.h"
-#include "titanic/star_control/matrix_inv.h"
+//#include "titanic/star_control/matrix_inv.h"
 #include "titanic/star_control/unmarked_camera_mover.h"
 #include "titanic/star_control/error_code.h"
 #include "titanic/support/simple_file.h"
@@ -525,20 +525,8 @@ bool CStarCamera::lockMarker2(CViewport *viewport, const FVector &secondStarPosi
 	FPose m10 = starDelta.formRotXY();
 	FPose m11;
 	fposeProd(m10,m3,m11);
-	
-	float A[16]={m11._row1._x,m11._row1._y,m11._row1._z, 0.0,
-				 m11._row2._x,m11._row2._y,m11._row2._z, 0.0,
-				 m11._row3._x,m11._row3._y,m11._row3._z, 0.0,
-				 m11._vector._x,m11._vector._y,m11._vector._z, 1.0};
-	// Inverse matrix
-	float B[16]={};
-
-	// B contains inverse of A
-	matrix4Inverse<float>(A,B);
-	m10=m11.inverseTransform();
-	m10._vector._x=B[12];
-	m10._vector._y=B[13];
-	m10._vector._z=B[14];
+
+	m10 = m11.inverseTransform();
 
 	FVector oldPos = _viewport._position;
 
-- 
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