| | '''OpenGL extension SGIS.texture_edge_clamp |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.SGIS.texture_edge_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 to clamp a texture without requiring a border, and |
| | without using the constant border color. |
| | |
| | This extension defines a new texture clamping algorithm. |
| | CLAMP_TO_EDGE_SGIS clamps texture coordinates at all mipmap levels such |
| | that the texture filter never samples a border texel. When used with a |
| | NEAREST or a LINEAR filter, the color returned when clamping is derived |
| | only from texels at the edge of the texture image. When used with |
| | FILTER4 filters, the filter operations of CLAMP_TO_EDGE_SGIS are defined |
| | but don't result in a nice clamp-to-edge color. |
| | |
| | CLAMP_TO_EDGE_SGIS is supported by 1, 2, and 3-dimensional textures |
| | only. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/SGIS/texture_edge_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_edge_clamp import * |
| | from OpenGL.raw.GL.SGIS.texture_edge_clamp import _EXTENSION_NAME |
| |
|
| | def glInitTextureEdgeClampSGIS(): |
| | '''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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| | |
