CoolVLViewer/indra/llmath/llvector4logical.h

/**
 * @file llvector4logical.h
 * @brief LLVector4Logical class header file - Companion class to LLVector4a for logical and bit-twiddling operations
 *
 * $LicenseInfo:firstyear=2010&license=viewergpl$
 *
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * Second Life Viewer Source Code
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 *
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 * in the file doc/FLOSS-exception.txt in this software distribution, or
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 */

#ifndef	LL_VECTOR4LOGICAL_H
#define	LL_VECTOR4LOGICAL_H

#include "hbintrinsics.h"

// This class is incomplete. If you need additional functionality, for example
// setting/unsetting particular elements or performing other boolean
// operations, feel free to implement. If you need assistance in determining
// the most optimal implementation, contact someone with SSE experience
// (Falcon, Richard, Davep, e.g.)

alignas(16) thread_local const U32 S_V4LOGICAL_MASK_TABLE[4 * 4] =
{
	0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000,
	0x00000000, 0xFFFFFFFF, 0x00000000, 0x00000000,
	0x00000000, 0x00000000, 0xFFFFFFFF, 0x00000000,
	0x00000000, 0x00000000, 0x00000000, 0xFFFFFFFF
};

alignas(16) thread_local const U32 S_V4LOGICAL_ALL_ONES[4] = {
	0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
};

class LLVector4Logical
{
public:

	enum {
		MASK_X = 1,
		MASK_Y = 1 << 1,
		MASK_Z = 1 << 2,
		MASK_W = 1 << 3,
		MASK_XYZ = MASK_X | MASK_Y | MASK_Z,
		MASK_XYZW = MASK_XYZ | MASK_W
	};

	LLVector4Logical() = default;

	LL_INLINE LLVector4Logical(const LLQuad& quad)
	{
		mQ = quad;
	}

	// Creates and return a mask consisting of the lowest order bit of each
	// element
	LL_INLINE U32 getGatheredBits() const
	{
		return _mm_movemask_ps(mQ);
	}

	// Inverts this mask
	LL_INLINE LLVector4Logical& invert()
	{
		mQ = _mm_andnot_ps(mQ, _mm_load_ps((F32*)(S_V4LOGICAL_ALL_ONES)));
		return *this;
	}

	LL_INLINE LLBool32 areAllSet(U32 mask) const
	{
		return (getGatheredBits() & mask) == mask;
	}

	LL_INLINE LLBool32 areAllSet() const
	{
		return areAllSet(MASK_XYZW);
	}

	LL_INLINE LLBool32 areAnySet(U32 mask) const
	{
		return getGatheredBits() & mask;
	}

	LL_INLINE LLBool32 areAnySet() const
	{
		return areAnySet(MASK_XYZW);
	}

	LL_INLINE operator LLQuad() const
	{
		return mQ;
	}

	LL_INLINE void clear()
	{
		mQ = _mm_setzero_ps();
	}

	template<int N> LL_INLINE void setElement()
	{
		mQ = _mm_or_ps(mQ, _mm_load_ps((F32*)&S_V4LOGICAL_MASK_TABLE[4 * N]));
	}

private:
	LLQuad mQ;
};

#endif //LL_VECTOR4ALOGICAL_H