| | '''OpenGL extension NV.draw_texture |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.NV.draw_texture to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension provides a new function, DrawTextureNV(), allowing |
| | applications to draw an screen-aligned rectangle displaying some or all of |
| | the contents of a two-dimensional or rectangle texture. Callers specify a |
| | texture object, an optional sampler object, window coordinates of the |
| | rectangle to draw, and texture coordinates corresponding to the corners of |
| | the rectangle. For each fragment produced by the rectangle, DrawTextureNV |
| | interpolates the texture coordinates, performs a texture lookup, and uses |
| | the texture result as the fragment color. |
| | |
| | No shaders are used by DrawTextureNV; the results of the texture lookup |
| | are used in lieu of a fragment shader output. The fragments generated are |
| | processed by all per-fragment operations. In particular, |
| | DrawTextureNV() fully supports blending and multisampling. |
| | |
| | While this functionality can be obtained in unextended OpenGL by drawing a |
| | rectangle and using a fragment shader to do a texture lookup, |
| | DrawTextureNV() is likely to have better power efficiency on |
| | implementations supporting this extension. Additionally, use of this |
| | extension frees the application developer from having to set up |
| | specialized shaders, transformation matrices, vertex attributes, and |
| | various other state in order to render the rectangle. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/NV/draw_texture.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.draw_texture import * |
| | from OpenGL.raw.GL.NV.draw_texture import _EXTENSION_NAME |
| |
|
| | def glInitDrawTextureNV(): |
| | '''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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| | |
