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diff --git a/sdk/rwsdk/include/d3d8/rtslerp.h b/sdk/rwsdk/include/d3d8/rtslerp.h
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--- a/sdk/rwsdk/include/d3d8/rtslerp.h
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-/*
- * Data Structures for Slerps/Spherical Linear Interpolations
- * See also GemsIII/quatspin.c in
- * http://www.acm.org/pubs/tog/GraphicsGems/gemsiii.zip
- * Copyright (c) Criterion Software Limited
- */
-
-/***************************************************************************
- * *
- * Module : rtslerp.h *
- * *
- * Purpose : Slerp functionality *
- * *
- **************************************************************************/
-
-#ifndef RTSLERP_H
-#define RTSLERP_H
-
-/**
- * \defgroup rtslerp RtSlerp
- * \ingroup rttool
- *
- * Slerp/Spherical Linear Interpolations Toolkit for RenderWare.
- *
- * See also http://www.cis.ohio-state.edu/~parent/book/Full.html
- */
-
-#include "rwcore.h"
-#include "rtquat.h"
-
-/****************************************************************************
- Includes
- */
-
-#include "rtslerp.rpe" /* automatically generated header file */
-
-/****************************************************************************
- Defines
- */
-
-/* Masks for specifying which matrices to store by reference */
-#define rtSLERPREFNONE 0x00
-#define rtSLERPREFSTARTMAT 0x01
-#define rtSLERPREFENDMAT 0x02
-#define rtSLERPREFALL (~rtSLERPREFNONE)
-
-/****************************************************************************
- Global Types
- */
-
-
-typedef struct RtSlerp RtSlerp;
-/**
- * \ingroup rtslerp
- * \struct RtSlerp
- * structure describing a Slerps/Spherical Linear Interpolations.
- * See also GemsIII/quatspin.c in
- * http://www.acm.org/pubs/tog/GraphicsGems/gemsiii.zip
- */
-struct RtSlerp
-{
- RwInt32 matRefMask; /**< Which matrices do we NOT own */
- RwMatrix *startMat; /**< The start matrix */
- RwMatrix *endMat; /**< The end matrix */
- RwV3d axis; /**< The axis of rotation for the slerp */
- RwReal angle; /**< The angle (in degrees) between src & dest */
-
- /* Though a slerp may be a bad idea and opting for a lerp is better */
- RwBool useLerp; /**< Do we want to use lerps? */
-};
-
-/* static frame sequence animation - contains no state */
-
-
-typedef struct RtQuatSlerpCache RtQuatSlerpCache;
-/**
- * \ingroup rtslerp
- * \struct RtQuatSlerpCache
- * structure describing a SlerpCache,
- * which should be initialized with \ref RtQuatSetupSlerpCache.
- */
-struct RtQuatSlerpCache
-{
- RtQuat raFrom; /**< Scaled initial quaternion */
- RtQuat raTo; /**< Scaled final quaternion */
- RwReal omega; /**< Angular displacement in radians */
- RwBool nearlyZeroOm; /**< Flags near-zero angular
- displacement*/
-};
-
-
-typedef struct RtQuatSlerpArgandCache RtQuatSlerpArgandCache;
-/**
- * \ingroup rtslerp
- * \struct RtQuatSlerpArgandCache
- * a structure describing
- * an Argand SlerpCache which should be
- * initialized with \ref RtQuatSetupSlerpArgandCache.
- * See http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Argand.html
- * Jean Argand was an accountant and amateur mathematician.
- * He is famed for his geometrical interpretation of the complex numbers
- * where i is interpreted as a rotation through 90.
- */
-struct RtQuatSlerpArgandCache
-{
- RtQuat logTo; /**< field Logarithm of final quaternion */
- RtQuat logBase; /**< Logarithm of initial relative to final quaternion */
-};
-
-#define RtQuatSlerpMacro(qpResult, qpFrom, qpTo, rT, sCache) \
-MACRO_START \
-{ \
- if ((rT) <= ((RwReal) 0)) \
- { \
- /* t is before start */ \
- *(qpResult) = *(qpFrom); \
- } \
- else if (((RwReal) 1) <= (rT)) \
- { \
- \
- /* t is after end */ \
- *(qpResult) = *(qpTo); \
- } \
- else \
- { \
- /* ... so t must be in the interior then */ \
- /* Calc coefficients rSclFrom, rSclTo */ \
- RwReal rSclFrom = ((RwReal) 1) - (rT); \
- RwReal rSclTo = (rT); \
- \
- if (!((sCache)->nearlyZeroOm)) \
- { \
- /* Standard case: slerp */ \
- /* SLERPMESSAGE(("Neither nearly ZERO nor nearly PI")); */ \
- \
- rSclFrom *= (sCache)->omega; \
- RwSinMinusPiToPiMacro(rSclFrom, rSclFrom); \
- rSclTo *= (sCache)->omega; \
- RwSinMinusPiToPiMacro(rSclTo, rSclTo); \
- } \
- \
- /* Calc final values */ \
- RwV3dScaleMacro(&(qpResult)->imag, \
- &(sCache)->raFrom.imag, rSclFrom); \
- RwV3dIncrementScaledMacro(&(qpResult)->imag, \
- &(sCache)->raTo.imag, rSclTo); \
- (qpResult)->real = \
- ((sCache)->raFrom.real * rSclFrom) + \
- ((sCache)->raTo.real * rSclTo); \
- } \
-} \
-MACRO_STOP
-
-#define RtQuatSlerpArgandMacro(qpResult, qpFrom, qpTo, rT, sArgandCache) \
-MACRO_START \
-{ \
- if ((rT) <= ((RwReal) 0)) \
- { \
- /* t is before start */ \
- *(qpResult) = *(qpFrom); \
- } \
- else if (((RwReal) 1) <= (rT)) \
- { \
- /* t is after end */ \
- *(qpResult) = *(qpTo); \
- } \
- else \
- { \
- RtQuat logBlend; \
- \
- /* ... so t must be in the interior then */ \
- \
- logBlend.imag.x = \
- (sArgandCache)->logBase.imag.x + \
- (rT) * (sArgandCache)->logTo.imag.x; \
- logBlend.imag.y = \
- (sArgandCache)->logBase.imag.y + \
- (rT) * (sArgandCache)->logTo.imag.y; \
- logBlend.imag.z = \
- (sArgandCache)->logBase.imag.z + \
- (rT) * (sArgandCache)->logTo.imag.z; \
- logBlend.real = 0; \
- \
- RtQuatUnitExpMacro((qpResult), &logBlend); \
- \
- } \
-} \
-MACRO_STOP
-
-#if (! ( defined(RWDEBUG) || defined(RWSUPPRESSINLINE) ))
-
-#define RtQuatSlerp(qpResult, qpFrom, qpTo, rT, sCache) \
- RtQuatSlerpMacro(qpResult, qpFrom, qpTo, rT, sCache)
-
-#define RtQuatSlerpArgand(qpResult, qpFrom, qpTo, rT, sArgandCache) \
- RtQuatSlerpArgandMacro(qpResult, qpFrom, qpTo, rT, sArgandCache)
-
-#endif /* (! ( defined(RWDEBUG) || defined(RWSUPPRESSINLINE) )) */
-
-/****************************************************************************
- Function prototypes
- */
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif /* __cplusplus */
-
-/* Creating and destroying slerps */
-
-extern RtSlerp *RtSlerpCreate(RwInt32 nMatRefMask);
-
-extern void RtSlerpDestroy(RtSlerp * spSlerp);
-
-/* setting up a slerp */
-extern RtSlerp *RtSlerpInitialize(RtSlerp * spSlerp,
- RwMatrix * mpMat1,
- RwMatrix * mpMat2);
-
-/* Get a matrix */
-extern RwMatrix *RtSlerpGetMatrix(RtSlerp * spSlerp,
- RwMatrix * mpResultMat,
- RwReal nDelta);
-
-/* Set if lerp or slerp */
-extern RtSlerp *RtSlerpSetLerp(RtSlerp * spSlerp,
- RwBool bUseLerp);
-
-extern void
-RtQuatSetupSlerpCache(RtQuat * qpFrom,
- RtQuat * qpTo,
- RtQuatSlerpCache * sCache);
-
-extern void
-RtQuatSetupSlerpArgandCache(RtQuat * qpFrom,
- RtQuat * qpTo,
- RtQuatSlerpArgandCache * sArgandCache);
-
-#if ( defined(RWDEBUG) || defined(RWSUPPRESSINLINE) )
-
-extern void
-RtQuatSlerp(RtQuat * qpResult,
- RtQuat * qpFrom,
- RtQuat * qpTo,
- RwReal rT,
- RtQuatSlerpCache * sCache);
-
-extern void
-RtQuatSlerpArgand(RtQuat * qpResult,
- RtQuat * qpFrom,
- RtQuat * qpTo,
- RwReal rT,
- RtQuatSlerpArgandCache * sArgandCache);
-
-#endif /* ( defined(RWDEBUG) || defined(RWSUPPRESSINLINE) ) */
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* RTSLERP_H */
-
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