Class: HalfFloatArray

• Inheritance
• Description
• Related information
• Class protocol
  • queries
• Instance protocol
  • accessing
  • queries

Inheritance:

   Object
   |
   +--Collection
      |
      +--SequenceableCollection
         |
         +--ArrayedCollection
            |
            +--UninterpretedBytes
               |
               +--AbstractNumberVector
                  |
                  +--HalfFloatArray

Package:

stx:libbasic2

Category:

Collections-Arrayed

Version:

rev: 1.8 date: 2016/08/24 15:06:12

user: cg

file: HalfFloatArray.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Author:

Claus Gittinger

Description:

HalfFloatArrays store half precision (16bit) floats (and nothing else).
HalfFloats were traditionally seldom used, but seem to become more popular
these days, as some 3D graphics accelerators and game engines use them
for very dense and compact storage of texture and vertex data.

Notice, that HalfFloats are not supported as first class objects by the ST/X system;
i.e. outside of a HalfFloatArray, these values are represented as floats
or doubles. When accessing a HalfFloatArray's element via getters/setters,
shortFloat (i.e. single precision 32bit floats) are exchanged.

Be aware that the numeric range of a half-float is very very limited.

[memory requirements:]
    OBJ-HEADER + (size * 2)

Related information:

    FloatArray
    DoubleArray
    Array
    http://www.opengl.org/wiki/Small_Float_Formats

Class protocol:

 elementByteSize

for bit-like containers, return the number of bytes stored per element.
Here, 2 is returned

Instance protocol:

 at: index

 at: index put: aFloat

 defaultElement

 isValidElement: anObject

return true, if I can hold this kind of object

 numFloats