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'''OpenGL extension SGIX.depth_pass_instrument |
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This module customises the behaviour of the |
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OpenGL.raw.GL.SGIX.depth_pass_instrument 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 defines an instrument that uses the API defined in |
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SGIX_instruments. The instrument specified by this extension is a |
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counter of the number of fragments which passed the Z test during |
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rasterization. The maximum value of the counter is an |
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implementation-dependent constant. |
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Some systems may maintain counters on different parts of the |
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system. For example, a system with a frame buffer distributed |
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across multiple chips may maintain a count of the fragments which |
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passed the depth test on each individual chip. In this extension, |
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a queriable constant is defined that indicates the number of |
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responses to expect when a measurement is taken. This |
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mechanism allows GL implementations to be as efficient as possible. |
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The official definition of this extension is available here: |
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http://www.opengl.org/registry/specs/SGIX/depth_pass_instrument.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.depth_pass_instrument import * |
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from OpenGL.raw.GL.SGIX.depth_pass_instrument import _EXTENSION_NAME |
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def glInitDepthPassInstrumentSGIX(): |
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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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