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CryAnimation/QuaternionExponentX87.h

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+#ifndef _CRY_ANIMATION_QUATERNION_EXPONENT_HDR_
+#define _CRY_ANIMATION_QUATERNION_EXPONENT_HDR_
+
+#include "platform.h"
+
+#if defined(_CPU_X86) && !defined(LINUX)
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//////////////////////////////////////////////////////////////////////////
+// x87 asm optimized quaternion exponent
+// Estimated runtime in good conditions: 315 cycles on P4
+// PARAMETERS:
+//   pSrcVector[IN] - the vector to calculate the exponent for
+//   pDstQuat  [OUT]- the quaternion (exponent of the input)
+// NOTE:
+//   The input vector mimics a quaternion with 0 real component (W)
+//   This version uses FSINCOS, which takes ~70% of execution time
+//////////////////////////////////////////////////////////////////////////
+void quaternionExponent_x87(const float* pSrc, float* pDst);
+
+//////////////////////////////////////////////////////////////////////////
+// x87 asm optimized quaternion exponent
+// Estimated runtime: 110 cycles on P4
+// PARAMETERS:
+//   pSrcVector[IN] - the vector to calculate the exponent for
+//   pDstQuat  [OUT]- the quaternion (exponent of the input)
+// WARNING:
+//   the source vector length should be no more than 3-4, otherwise the sin/cos
+//   approximations won't work
+// NOTE:
+//   The input vector mimics a quaternion with 0 real component (W)
+//   This version uses approximation to FSINCOS (tailor series up to 9th magnitude)
+//////////////////////////////////////////////////////////////////////////
+void quaternionExponent_x87approx(const float* pSrc, float* pDst);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#endif