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'''OpenGL extension SGIX.pbuffer |
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This module customises the behaviour of the |
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OpenGL.raw.GLX.SGIX.pbuffer 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 pixel buffers (GLXPbuffers, or pbuffer for |
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short). GLXPbuffers are additional non-visible rendering buffers for an |
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OpenGL renderer. GLXPbuffers are equivalent to GLXPixmaps with the |
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following exceptions: |
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1. There is no associated X pixmap. Also, since a GLXPbuffer is a GLX |
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resource, it may not be possible to render to it using X or an |
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X extension other than GLX. |
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2. The format of the color buffers and the type and size of any |
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associated ancillary buffers for a GLXPbuffer can only be |
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described with a GLXFBConfig -- an X Visual cannot be used. |
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3. It is possible to create a GLXPbuffer whose contents may be |
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asynchronously lost at any time. |
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4. GLXPbuffers can be rendered to using either direct or indirect |
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rendering contexts. |
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5. The allocation of a GLXPbuffer can fail if there are insufficient |
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resources (i.e., all the pbuffer memory has been allocated and |
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the implementation does not virtualize pbuffer memory.) |
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The intent of the pbuffer semantics is to enable implementations to |
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allocate pbuffers in non-visible frame buffer memory. These |
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pbuffers are intended to be "static" resources, in that a program |
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will typically allocate them only once, rather than as a part of its |
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rendering loop. (But they should be deallocated when the program is |
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no longer using them -- for example, if the program is iconified.) |
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The frame buffer resources that are associated with a pbuffer are |
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also static, and are deallocated only when the pbuffer is destroyed, |
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or, in the case of a "unpreserved" pbuffer, as a result of X server |
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activity that changes its frame buffer requirements. |
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The official definition of this extension is available here: |
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http://www.opengl.org/registry/specs/SGIX/pbuffer.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.SGIX.pbuffer import * |
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from OpenGL.raw.GLX.SGIX.pbuffer import _EXTENSION_NAME |
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def glInitPbufferSGIX(): |
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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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