| '''OpenGL extension NV.conservative_raster |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES2.NV.conservative_raster to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension adds a "conservative" rasterization mode where any pixel |
| that is partially covered, even if no sample location is covered, is |
| treated as fully covered and a corresponding fragment will be shaded. |
| |
| A new control is also added to modify window coordinate snapping |
| precision. |
| |
| These controls can be used to implement "binning" to a low-resolution |
| render target, for example to determine which tiles of a sparse texture |
| need to be populated. An app can construct a framebuffer where there is |
| one pixel per tile in the sparse texture, and adjust the number of |
| subpixel bits such that snapping occurs to the same effective grid as when |
| rendering to the sparse texture. Then triangles should cover (at least) |
| the same pixels in the low-res framebuffer as they do tiles in the sparse |
| texture. |
| |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/NV/conservative_raster.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GLES2 import _types, _glgets |
| from OpenGL.raw.GLES2.NV.conservative_raster import * |
| from OpenGL.raw.GLES2.NV.conservative_raster import _EXTENSION_NAME |
|
|
| def glInitConservativeRasterNV(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
