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'''OpenGL extension ARB.multisample |
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This module customises the behaviour of the |
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OpenGL.raw.GLX.ARB.multisample to provide a more |
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Python-friendly API |
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Overview (from the spec) |
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This extension provides a mechanism to antialias all GL primitives: |
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points, lines, polygons, bitmaps, and images. The technique is to |
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sample all primitives multiple times at each pixel. The color |
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sample values are resolved to a single, displayable color each time |
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a pixel is updated, so the antialiasing appears to be automatic at |
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the application level. Because each sample includes depth and |
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stencil information, the depth and stencil functions perform |
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equivalently to the single-sample mode. |
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An additional buffer, called the multisample buffer, is added to |
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the framebuffer. Pixel sample values, including color, depth, and |
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stencil values, are stored in this buffer. When the framebuffer |
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includes a multisample buffer, it does not also include separate |
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depth or stencil buffers, even if the multisample buffer does not |
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store depth or stencil values. Color buffers (left/right, front/ |
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back, and aux) do coexist with the multisample buffer, however. |
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Multisample antialiasing is most valuable for rendering polygons, |
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because it requires no sorting for hidden surface elimination, and |
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it correctly handles adjacent polygons, object silhouettes, and |
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even intersecting polygons. If only points or lines are being |
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rendered, the "smooth" antialiasing mechanism provided by the base |
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GL may result in a higher quality image. This extension is |
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designed to allow multisample and smooth antialiasing techniques |
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to be alternated during the rendering of a single scene. |
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The official definition of this extension is available here: |
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http://www.opengl.org/registry/specs/ARB/multisample.txt |
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''' |
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from OpenGL import platform, constant, arrays |
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from OpenGL import extensions, wrapper |
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import ctypes |
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from OpenGL.raw.GLX import _types, _glgets |
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from OpenGL.raw.GLX.ARB.multisample import * |
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from OpenGL.raw.GLX.ARB.multisample import _EXTENSION_NAME |
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def glInitMultisampleARB(): |
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'''Return boolean indicating whether this extension is available''' |
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from OpenGL import extensions |
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return extensions.hasGLExtension( _EXTENSION_NAME ) |
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