150 lines
4.9 KiB
C++
150 lines
4.9 KiB
C++
/**
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* @file llv4math.h
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* @brief LLV4* class header file - vector processor enabled math
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*
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* $LicenseInfo:firstyear=2007&license=viewergpl$
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*
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* Copyright (c) 2007-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLV4MATH_H
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#define LL_LLV4MATH_H
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// *NOTE: We do not support SSE acceleration on Windows builds.
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// Our minimum specification for the viewer includes 1 GHz Athlon processors,
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// which covers the Athlon Thunderbird series that does not support SSE.
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//
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// Our header files include statements like this
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// const F32 HAVOK_TIMESTEP = 1.f / 45.f;
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// This creates "globals" that are included in each .obj file. If a single
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// .cpp file has SSE code generation turned on (eg, llviewerjointmesh_sse.cpp)
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// these globals will be initialized using SSE instructions. This causes SL
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// to crash before main() on processors without SSE. Untangling all these
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// headers/variables is too much work for the small performance gains of
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// vectorization.
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//
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// Therefore we only support vectorization on builds where the everything is
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// built with SSE or Altivec. See https://jira.secondlife.com/browse/VWR-1610
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// and https://jira.lindenlab.com/browse/SL-47720 for details.
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//
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// Sorry the code is such a mess. JC
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#include "llpreprocessor.h"
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// LLV4MATH - GNUC
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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#if LL_GNUC && __GNUC__ >= 4 && __SSE__
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#define LL_VECTORIZE 1
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#if LL_DARWIN
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#include <Accelerate/Accelerate.h>
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#include <xmmintrin.h>
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typedef vFloat V4F32;
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#else
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#include <xmmintrin.h>
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typedef float V4F32 __attribute__((vector_size(16)));
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#endif
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#endif
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#if LL_GNUC
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#define LL_LLV4MATH_ALIGN_PREFIX
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#define LL_LLV4MATH_ALIGN_POSTFIX __attribute__((aligned(16)))
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#endif
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// LLV4MATH - MSVC
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Only vectorize if the entire Windows build uses SSE.
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// _M_IX86_FP is set when SSE code generation is turned on, and I have
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// confirmed this in VS2003, VS2003 SP1, and VS2005. JC
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#if LL_MSVC && _M_IX86_FP
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#define LL_VECTORIZE 1
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#include <xmmintrin.h>
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typedef __m128 V4F32;
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#endif
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#if LL_MSVC
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#define LL_LLV4MATH_ALIGN_PREFIX __declspec(align(16))
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#define LL_LLV4MATH_ALIGN_POSTFIX
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#endif
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// LLV4MATH - default - no vectorization
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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#if !LL_VECTORIZE
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#define LL_VECTORIZE 0
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struct V4F32 { F32 __pad__[4]; };
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inline F32 llv4lerp(F32 a, F32 b, F32 w) { return ( b - a ) * w + a; }
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#endif
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#ifndef LL_LLV4MATH_ALIGN_PREFIX
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# define LL_LLV4MATH_ALIGN_PREFIX
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#endif
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#ifndef LL_LLV4MATH_ALIGN_POSTFIX
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# define LL_LLV4MATH_ALIGN_POSTFIX
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#endif
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// LLV4MATH
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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#define LLV4_NUM_AXIS 4
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class LLV4Vector3;
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class LLV4Matrix3;
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class LLV4Matrix4;
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#endif
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