| '''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 ) |
|
|
|
|
| |
