| '''OpenGL extension EXT.packed_float |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.EXT.packed_float to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension adds a new 3-component floating-point texture format |
| that fits within a single 32-bit word. This format stores 5 bits |
| of biased exponent per component in the same manner as 16-bit |
| floating-point formats, but rather than 10 mantissa bits, the red, |
| green, and blue components have 6, 6, and 5 bits respectively. |
| Each mantissa is assumed to have an implied leading one except in the |
| denorm exponent case. There is no sign bit so only non-negative |
| values can be represented. Positive infinity, positive denorms, |
| and positive NaN values are representable. The value of the fourth |
| component returned by a texture fetch is always 1.0. |
| |
| This extension also provides support for rendering into an unsigned |
| floating-point rendering format with the assumption that the texture |
| format described above could also be advertised as an unsigned |
| floating-point format for rendering. |
| |
| The extension also provides a pixel external format for specifying |
| packed float values directly. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/EXT/packed_float.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GL import _types, _glgets |
| from OpenGL.raw.GL.EXT.packed_float import * |
| from OpenGL.raw.GL.EXT.packed_float import _EXTENSION_NAME |
|
|
| def glInitPackedFloatEXT(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
