| | '''OpenGL extension SGIS.texture_border_clamp |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.SGIS.texture_border_clamp to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | The base OpenGL provides clamping such that the texture coordinates are |
| | limited to exactly the range [0,1]. When a texture coordinate is |
| | clamped using this algorithm, the texture sampling filter straddles the |
| | edge of the texture image, taking 1/2 its sample values from within the |
| | texture image, and the other 1/2 from the texture border. It is |
| | sometimes desirable for a texture to be clamped to the border color, |
| | rather than to an average of the border and edge colors. |
| | |
| | This extension defines an additional texture clamping algorithm. |
| | CLAMP_TO_BORDER_SGIS clamps texture coordinates at all mipmap levels |
| | such that NEAREST and LINEAR filters return the color of the border |
| | texels. When used with FILTER4 filters, the filter operation of |
| | CLAMP_TO_BORDER_SGIS is defined but doesn't result in a nice |
| | clamp-to-border color. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/SGIS/texture_border_clamp.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.SGIS.texture_border_clamp import * |
| | from OpenGL.raw.GL.SGIS.texture_border_clamp import _EXTENSION_NAME |
| |
|
| | def glInitTextureBorderClampSGIS(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
|
| |
|
| | |
