| | '''OpenGL extension NV.primitive_restart |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.NV.primitive_restart to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension allows applications to easily and inexpensively |
| | restart a primitive in its middle. A "primitive restart" is simply |
| | the same as an End command, followed by another Begin command with |
| | the same mode as the original. The typical expected use of this |
| | feature is to draw a mesh with many triangle strips, though primitive |
| | restarts are legal for all primitive types, even for points (where |
| | they are not useful). |
| | |
| | Although the EXT_multi_draw_arrays extension did reduce the overhead |
| | of such drawing techniques, they still remain more expensive than one |
| | would like. |
| | |
| | This extension provides an extremely lightweight primitive restart, |
| | which is accomplished by allowing the application to choose a special |
| | index number that signals that a primitive restart should occur, |
| | rather than a vertex being provoked. This index can be an arbitrary |
| | 32-bit integer for maximum application convenience. |
| | |
| | In addition, for full orthogonality, a special OpenGL command is |
| | provided to restart primitives when in immediate mode. This command |
| | is not likely to increase performance in any significant fashion, but |
| | providing it greatly simplifies the specification and implementation |
| | of display list compilation and indirect rendering. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/NV/primitive_restart.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.primitive_restart import * |
| | from OpenGL.raw.GL.NV.primitive_restart import _EXTENSION_NAME |
| |
|
| | def glInitPrimitiveRestartNV(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
|
| |
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| | |
