HalfFloatArray.st
author Claus Gittinger <cg@exept.de>
Tue, 25 Jun 2019 14:28:51 +0200
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#DOCUMENTATION by cg class: SharedQueue comment/format in: #next #nextWithTimeout:
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"{ Encoding: utf8 }"
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"
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 COPYRIGHT (c) 2014 by Claus Gittinger
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	      All Rights Reserved
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 This software is furnished under a license and may be used
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 only in accordance with the terms of that license and with the
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 inclusion of the above copyright notice.   This software may not
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 be provided or otherwise made available to, or used by, any
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 other person.  No title to or ownership of the software is
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 hereby transferred.
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"
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"{ Package: 'stx:libbasic2' }"
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"{ NameSpace: Smalltalk }"
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UnboxedFloatArray variableWordSubclass:#HalfFloatArray
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	instanceVariableNames:''
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	classVariableNames:''
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	poolDictionaries:''
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	category:'Collections-Arrayed'
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!
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!HalfFloatArray primitiveFunctions!
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%{
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typedef unsigned short uint16;
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typedef unsigned int   uint32;
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#if 0
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#if defined(__GNUC__) || defined(__CLANG__) || defined(__MINGW__)
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inline float
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XMConvertHalfToFloat(float16_t Value) {
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    __m128i V1 = _mm_cvtsi32_si128( (uint32)(Value) );
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    __m128 V2 = _mm_cvtph_ps( V1 );
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    return _mm_cvtss_f32( V2 );
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}
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inline float16_t
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XMConvertFloatToHalf(float Value) {
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    __m128 V1 = _mm_set_ss( Value );
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    __m128i V2 = _mm_cvtps_ph( V1, 0 );
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    return (float16_t)( _mm_cvtsi128_si32(V2) );
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}
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#endif
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#endif
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//
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// convert a halffloat (16-bit float) to a float
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//
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extern float __STX_halffloat_to_float(float16_t h);
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//
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// convert a float to a halffloat (16-bit float)
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//
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extern float16_t __STX_float_to_halffloat(float f32);
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%}
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! !
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!HalfFloatArray class methodsFor:'documentation'!
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copyright
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"
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 COPYRIGHT (c) 2014 by Claus Gittinger
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	      All Rights Reserved
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 This software is furnished under a license and may be used
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 only in accordance with the terms of that license and with the
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 inclusion of the above copyright notice.   This software may not
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 be provided or otherwise made available to, or used by, any
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 other person.  No title to or ownership of the software is
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 hereby transferred.
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"
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!
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documentation
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"
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    HalfFloatArrays store half precision (16bit) floats (and nothing else).
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    HalfFloats were traditionally seldom used, but seem to become more popular
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    these days, as some 3D graphics accelerators and game engines use them
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    for very dense and compact storage of texture and vertex data.
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    Notice, that HalfFloats are not supported as first class objects by the ST/X system;
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    i.e. outside of a HalfFloatArray, these values are represented as floats
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    or doubles. When accessing a HalfFloatArray's element via getters/setters,
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    shortFloat (i.e. single precision 32bit floats) are exchanged.
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    Be aware that the numeric range of a half-float is very very limited.
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    [memory requirements:]
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	OBJ-HEADER + (size * 2)
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    [See also:]
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	FloatArray DoubleArray Array
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	http://www.opengl.org/wiki/Small_Float_Formats
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	https://en.wikipedia.org/wiki/Half-precision
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    [author:]
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	Claus Gittinger
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"
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! !
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!HalfFloatArray class methodsFor:'queries'!
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elementByteSize
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    "for bit-like containers, return the number of bytes stored per element.
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     Here, 2 is returned"
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    ^ 2
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! !
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!HalfFloatArray methodsFor:'accessing'!
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at:index
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%{  /* NOCONTEXT */
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    if (__isSmallInteger(index)) {
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	int i = __intVal(index);
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	int n = __wordArraySize(self);
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	if ((unsigned)i <= n) {
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	    float16_t h;
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	    OBJ newFloat;
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	    float f;
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	    h = (float16_t)(__WordArrayInstPtr(self)->s_element[i-1]);
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	    f = __STX_halffloat_to_float(h);
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	    __qMKSFLOAT(newFloat, f);
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	    RETURN ( newFloat );
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	}
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    }
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%}.
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    self primitiveFailed
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!
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at:index put:aFloat
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%{
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    if (! __isImmutable(self)) {
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        if (__isSmallInteger(index)) {
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            int i = __intVal(index);
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            int n = __wordArraySize(self);
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            if ((unsigned)i <= n) {
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                float16_t h;
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                float f;
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                if (__isFloat(aFloat)) {
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                    f = (float)(__floatVal(aFloat));
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                } else if (__isShortFloat(aFloat)) {
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                    f = __shortFloatVal(aFloat);
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                } else if (__isSmallInteger(aFloat)) {
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                    f = (float)(__intVal(aFloat));
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                } else
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                    goto error;
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5015
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                h = __STX_float_to_halffloat(f);
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                __WordArrayInstPtr(self)->s_element[i-1] = h;
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                RETURN (aFloat);
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            }
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        }
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    }
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  error: ;
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%}.
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    "/ arrive here only in case of an error
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    self isImmutable ifTrue:[
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        self noModificationError
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    ].    
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    self primitiveFailed
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c4c87284e2ed #BUGFIX by cg
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    "Modified: / 09-06-2019 / 15:32:32 / Claus Gittinger"
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! !
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!HalfFloatArray methodsFor:'queries'!
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defaultElement
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    ^ ShortFloat zero
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!
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4044
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isValidElement:anObject
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    "return true, if I can hold this kind of object"
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    ^ anObject isNumber
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!
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numFloats
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    ^ self size
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! !
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4834
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!HalfFloatArray methodsFor:'testing'!
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   189
1a3b148d9442 #OTHER by cg
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   190
isFloatArray
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   191
    "return true if the receiver has float elements.
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   192
     These are Float, Double- and HalfFloat arrays"
1a3b148d9442 #OTHER by cg
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   193
1a3b148d9442 #OTHER by cg
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   194
    ^ true
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   195
1a3b148d9442 #OTHER by cg
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   196
    "Created: / 02-03-2019 / 23:14:00 / Claus Gittinger"
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   197
! !
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   198
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!HalfFloatArray class methodsFor:'documentation'!
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   200
3305
431660ac51d0 class: HalfFloatArray
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   201
version
4044
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   202
    ^ '$Header$'
3305
431660ac51d0 class: HalfFloatArray
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   203
!
431660ac51d0 class: HalfFloatArray
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   204
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   205
version_CVS
4044
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   206
    ^ '$Header$'
3159
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   207
! !
5015
c4c87284e2ed #BUGFIX by cg
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diff changeset
   208