| | '''OpenGL extension DFX.multisample |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.WGL.DFX.multisample to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension provides a mechanism to antialias all GL primitives: |
| | points, lines, polygons, bitmaps, and images. The technique is to |
| | sample all primitives multiple times at each pixel. The color sample |
| | values are resolved to a single, displayable color each time a pixel |
| | is updated, so the antialiasing appears to be automatic at the |
| | application level. Because each sample includes depth and stencil |
| | information, the depth and stencil functions perform equivalently to |
| | the single-sample mode. |
| | |
| | An additional buffer, called the multisample buffer, is added to the |
| | framebuffer. Pixel sample values, including color, depth, and |
| | stencil values, are stored in this buffer. When the framebuffer |
| | includes a multisample buffer, it does not also include separate |
| | depth or stencil buffers, even if the multisample buffer does not |
| | store depth or stencil values. Color buffers (left/right, |
| | front/back, and aux) do coexist with the multisample buffer, |
| | however. |
| | |
| | Multisample antialiasing is most valuable for rendering polygons, |
| | because it requires no sorting for hidden surface elimination, and |
| | it correctly handles adjacent polygons, object silhouettes, and even |
| | intersecting polygons. If only points or lines are being rendered, |
| | the "smooth" antialiasing mechanism provided by the base GL may |
| | result in a higher quality image. |
| | |
| | This extension is a subset of SGIS_multisample. It differs in these |
| | key ways: |
| | |
| | * Fragment alpha values are not affected by the fragment sample mask |
| | * The sample locations may or may not be fixed. Thus, there is no |
| | support for rendering the scene multiple times with different |
| | sample points. |
| | * Fragment masks are not computed for images or for bitmasks. |
| | |
| | Because of these differences a new extension was created. However, |
| | it is not expected that this extension will co-exist with |
| | SGIS_multisample. Because of this and the fact that there are only |
| | 32 push/pop bits the MULTISAMPLE_BIT_SGIS state value is the same as |
| | MUTLISAMPLE_BIT_3DFX. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/DFX/multisample.txt |
| | ''' |
| | from OpenGL import platform, constant, arrays |
| | from OpenGL import extensions, wrapper |
| | import ctypes |
| | from OpenGL.raw.WGL import _types, _glgets |
| | from OpenGL.raw.WGL.DFX.multisample import * |
| | from OpenGL.raw.WGL.DFX.multisample import _EXTENSION_NAME |
| |
|
| | def glInitMultisampleDFX(): |
| | '''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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| | |
