From 7d42b57289483fd59b770cdfa0f2923086508014 Mon Sep 17 00:00:00 2001
From: fincs <fincs.alt1@gmail.com>
Date: Wed, 27 Jan 2016 21:25:21 +0100
Subject: [PATCH] Fix Mtx_RotateX/Z to use standard mathematical convention
 (positive=CCW)

---
 source/maths/mtx_perspstereo.c | 4 ++--
 source/maths/mtx_persptilt.c   | 4 ++--
 source/maths/mtx_rotatex.c     | 4 ++--
 source/maths/mtx_rotatez.c     | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/source/maths/mtx_perspstereo.c b/source/maths/mtx_perspstereo.c
index 148e8de..23f0c93 100644
--- a/source/maths/mtx_perspstereo.c
+++ b/source/maths/mtx_perspstereo.c
@@ -32,6 +32,6 @@ void Mtx_PerspStereoTilt(C3D_Mtx* mtx, float fovx, float invaspect, float near,
 	// Translate to screen plane
 	Mtx_Translate(mtx, 0, iod/2, 0);
 
-	// Rotate the matrix one quarter of a turn CCW in order to fix the 3DS screens' orientation
-	Mtx_RotateZ(mtx, M_TAU/4, true);
+	// Rotate the matrix one quarter of a turn clockwise in order to fix the 3DS screens' orientation
+	Mtx_RotateZ(mtx, -M_TAU/4, true);
 }
diff --git a/source/maths/mtx_persptilt.c b/source/maths/mtx_persptilt.c
index 208f625..2ab5d44 100644
--- a/source/maths/mtx_persptilt.c
+++ b/source/maths/mtx_persptilt.c
@@ -39,6 +39,6 @@ void Mtx_PerspTilt(C3D_Mtx* mtx, float fovx, float invaspect, float near, float
 	mp2.r[2].w = -0.5;
 	Mtx_Multiply(mtx, &mp2, &mp);
 
-	// Rotate the matrix one quarter of a turn CCW in order to fix the 3DS screens' orientation
-	Mtx_RotateZ(mtx, M_TAU/4, true);
+	// Rotate the matrix one quarter of a turn clockwise in order to fix the 3DS screens' orientation
+	Mtx_RotateZ(mtx, -M_TAU/4, true);
 }
diff --git a/source/maths/mtx_rotatex.c b/source/maths/mtx_rotatex.c
index ca18aea..b5baf12 100644
--- a/source/maths/mtx_rotatex.c
+++ b/source/maths/mtx_rotatex.c
@@ -10,8 +10,8 @@ void Mtx_RotateX(C3D_Mtx* mtx, float angle, bool bRightSide)
 	Mtx_Zeros(&rm);
 	rm.r[0].x = 1.0f;
 	rm.r[1].y = cosAngle;
-	rm.r[1].z = sinAngle;
-	rm.r[2].y = -sinAngle;
+	rm.r[1].z = -sinAngle;
+	rm.r[2].y = sinAngle;
 	rm.r[2].z = cosAngle;
 	rm.r[3].w = 1.0f;
 
diff --git a/source/maths/mtx_rotatez.c b/source/maths/mtx_rotatez.c
index 59ca617..b951ef8 100644
--- a/source/maths/mtx_rotatez.c
+++ b/source/maths/mtx_rotatez.c
@@ -9,8 +9,8 @@ void Mtx_RotateZ(C3D_Mtx* mtx, float angle, bool bRightSide)
 
 	Mtx_Zeros(&rm);
 	rm.r[0].x = cosAngle;
-	rm.r[0].y = sinAngle;
-	rm.r[1].x = -sinAngle;
+	rm.r[0].y = -sinAngle;
+	rm.r[1].x = sinAngle;
 	rm.r[1].y = cosAngle;
 	rm.r[2].z = 1.0f;
 	rm.r[3].w = 1.0f;