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'''OpenGL extension SGIX.framezoom |
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This module customises the behaviour of the |
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OpenGL.raw.GL.SGIX.framezoom 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 additional way to rasterize geometric |
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primitives and pixel rectangles. The techique is to reduce the |
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number of pixels rasterized and (possibly) the number of depth and |
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stencil operations performed per primitive. Each pixel is zoomed |
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up and used to render an N x N block of screen pixels. The |
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implementation is free to choose the number of stencil and z pixels |
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that will correspond to each N x N block. |
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This extension provides an opportunity to the implementation to |
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perform expensive raster operations at a reduced resolution, |
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increasing performance. Such operations may include |
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texture-mapping, depth & stencil tests, etc. The hardware should |
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be allowed to perform operations that it accelerates at full |
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hardware speed. |
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The visual result will be the same as if a scene were rendered into |
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a small window, and then that buffer was copied and zoomed up into |
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a large window. |
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All OpenGL parameters that effect rasterization size will implicitly |
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be multipled by N (this includes point size, line width, etc). |
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The official definition of this extension is available here: |
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http://www.opengl.org/registry/specs/SGIX/framezoom.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.GL import _types, _glgets |
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from OpenGL.raw.GL.SGIX.framezoom import * |
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from OpenGL.raw.GL.SGIX.framezoom import _EXTENSION_NAME |
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def glInitFramezoomSGIX(): |
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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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