From a4c804b49ec872b71bd5a0167c3ad45704a3cc30 Mon Sep 17 00:00:00 2001
From: adiblol <adiblol@1tbps.org>
Date: Thu, 8 Mar 2012 19:32:05 +0100
Subject: Initial commit, Copyright (C) 2001-2008, Daniel ROUX & EPSITEC SA,
 www.epsitec.ch

---
 src/d3dmath.h | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 src/d3dmath.h

(limited to 'src/d3dmath.h')

diff --git a/src/d3dmath.h b/src/d3dmath.h
new file mode 100644
index 0000000..8315d88
--- /dev/null
+++ b/src/d3dmath.h
@@ -0,0 +1,81 @@
+//-----------------------------------------------------------------------------
+// File: D3DMath.h
+//
+// Desc: Math functions and shortcuts for Direct3D programming.
+//
+// Copyright (c) 1997-1999 Microsoft Corporation. All rights reserved
+//-----------------------------------------------------------------------------
+#ifndef D3DMATH_H
+#define D3DMATH_H
+#include <ddraw.h>
+#include <d3d.h>
+
+
+//-----------------------------------------------------------------------------
+// Useful Math constants
+//-----------------------------------------------------------------------------
+const FLOAT g_PI       =  3.14159265358979323846f; // Pi
+const FLOAT g_2_PI     =  6.28318530717958623200f; // 2 * Pi
+const FLOAT g_PI_DIV_2 =  1.57079632679489655800f; // Pi / 2
+const FLOAT g_PI_DIV_4 =  0.78539816339744827900f; // Pi / 4
+const FLOAT g_INV_PI   =  0.31830988618379069122f; // 1 / Pi
+const FLOAT g_DEGTORAD =  0.01745329251994329547f; // Degrees to Radians
+const FLOAT g_RADTODEG = 57.29577951308232286465f; // Radians to Degrees
+const FLOAT g_HUGE     =  1.0e+38f;                // Huge number for FLOAT
+const FLOAT g_EPSILON  =  1.0e-5f;                 // Tolerance for FLOATs
+
+
+
+
+//-----------------------------------------------------------------------------
+// Fuzzy compares (within tolerance)
+//-----------------------------------------------------------------------------
+inline BOOL D3DMath_IsZero( FLOAT a, FLOAT fTol = g_EPSILON )
+{ return ( a <= 0.0f ) ? ( a >= -fTol ) : ( a <= fTol ); }
+
+
+
+
+//-----------------------------------------------------------------------------
+// Matrix functions
+//-----------------------------------------------------------------------------
+VOID    D3DMath_MatrixMultiply( D3DMATRIX& q, D3DMATRIX& a, D3DMATRIX& b );
+HRESULT D3DMath_MatrixInvert( D3DMATRIX& q, D3DMATRIX& a );
+
+
+
+
+//-----------------------------------------------------------------------------
+// Vector functions
+//-----------------------------------------------------------------------------
+HRESULT D3DMath_VectorMatrixMultiply( D3DVECTOR& vDest, D3DVECTOR& vSrc,
+                                      D3DMATRIX& mat);
+HRESULT D3DMath_VertexMatrixMultiply( D3DVERTEX& vDest, D3DVERTEX& vSrc,
+                                      D3DMATRIX& mat );
+
+
+
+
+//-----------------------------------------------------------------------------
+// Quaternion functions
+//-----------------------------------------------------------------------------
+VOID D3DMath_QuaternionFromRotation( FLOAT& x, FLOAT& y, FLOAT& z, FLOAT& w,
+                                     D3DVECTOR& v, FLOAT fTheta );
+VOID D3DMath_RotationFromQuaternion( D3DVECTOR& v, FLOAT& fTheta,
+                                     FLOAT x, FLOAT y, FLOAT z, FLOAT w );
+VOID D3DMath_QuaternionFromAngles( FLOAT& x, FLOAT& y, FLOAT& z, FLOAT& w,
+                                   FLOAT fYaw, FLOAT fPitch, FLOAT fRoll );
+VOID D3DMath_MatrixFromQuaternion( D3DMATRIX& mat, FLOAT x, FLOAT y, FLOAT z,
+                                   FLOAT w );
+VOID D3DMath_QuaternionFromMatrix( FLOAT &x, FLOAT &y, FLOAT &z, FLOAT &w,
+                                   D3DMATRIX& mat );
+VOID D3DMath_QuaternionMultiply( FLOAT& Qx, FLOAT& Qy, FLOAT& Qz, FLOAT& Qw,
+                                 FLOAT Ax, FLOAT Ay, FLOAT Az, FLOAT Aw,
+                                 FLOAT Bx, FLOAT By, FLOAT Bz, FLOAT Bw );
+VOID D3DMath_QuaternionSlerp( FLOAT& Qx, FLOAT& Qy, FLOAT& Qz, FLOAT& Qw,
+                              FLOAT Ax, FLOAT Ay, FLOAT Az, FLOAT Aw,
+                              FLOAT Bx, FLOAT By, FLOAT Bz, FLOAT Bw,
+                              FLOAT fAlpha );
+
+
+#endif // D3DMATH_H
-- 
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