| | '''OpenGL extension NV.fragment_program2 |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.NV.fragment_program2 to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension, like the NV_fragment_program_option extension, provides |
| | additional fragment program functionality to extend the standard |
| | ARB_fragment_program language and execution environment. ARB programs |
| | wishing to use this added functionality need only add: |
| | |
| | OPTION NV_fragment_program2; |
| | |
| | to the beginning of their fragment programs. |
| | |
| | New functionality provided by this extension, above and beyond that |
| | already provided by the NV_fragment_program_option extension, includes: |
| | |
| | |
| | * structured branching support, including data-dependent IF tests, loops |
| | supporting a fixed number of iterations, and a data-dependent loop |
| | exit instruction (BRK), |
| | |
| | * subroutine calls, |
| | |
| | * instructions to perform vector normalization, divide vector components |
| | by a scalar, and perform two-component dot products (with or without a |
| | scalar add), |
| | |
| | * an instruction to perform a texture lookup with an explicit LOD, |
| | |
| | * a loop index register for indirect access into the texture coordinate |
| | attribute array, and |
| | |
| | * a facing attribute that indicates whether the fragment is generated |
| | from a front- or back-facing primitive. |
| | |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/NV/fragment_program2.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.NV.fragment_program2 import * |
| | from OpenGL.raw.GL.NV.fragment_program2 import _EXTENSION_NAME |
| |
|
| | def glInitFragmentProgram2NV(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
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| |
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| | |
