| '''OpenGL extension SGIX.dmbuffer |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLX.SGIX.dmbuffer to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension introduces a new type of GLXPbuffer, a DM or Digital |
| Media pbuffer. A DM pbuffer is a GLXPbuffer that adopts one or more |
| of its buffers from an externally defined and allocated DMbuffer. |
| In this way it resembles a GLXPixmap that attaches to an existing |
| X pixmap. Like a standard pbuffer it can be used as a non-displayable |
| rendering area, or as a read source for pixel data. The externally |
| defined buffers of the DM pbuffer can be sequentially associated |
| with other DM buffers of the same size and configuration. |
| |
| . The DM pbuffer is described with a new attrib passed to |
| glXCreateGLXPbuffer. |
| |
| . A new GLX command allows associating a compatible DMbuffer with |
| the DM GLXPbuffer. At associate time the DM buffers described |
| by the DMparams are used directly as the corresponding |
| buffers of the GLXPbuffer drawable, as described by the FBconfig. |
| All other buffers that are part of the config will be created by |
| GL without externally referenceable names. A DM pbuffer must be |
| associated with a compatible DMbuffer before it can be made current |
| to a GLX context. |
| |
| . The externally defined buffers of the DM pbuffer can be changed at |
| any time by successfully associating a new DMbuffer with the GLXPbuffer |
| through the associate command. It will be the application's |
| responsibility to synchronize DMedia, GLX, and GL commands that |
| effect the contents of the DM pbuffer. |
| |
| . Any direct GLX rendering context that satisfies config compatibility |
| can be used to render to or read from a DM GLXPbuffer. |
| A currently associated DMbuffer may simultaneously be in use by |
| other clients on the same Display, but will not be destroyed |
| while associated with a GLXPbuffer. When the GLXpbuffer is |
| destroyed, all buffers that have no remaining clients, including |
| the DMbuffer, will be freed. |
| |
| DM GLXPbuffers are proposed as a means for OpenGL to access buffers |
| generated by the VL, compression, and other digital media libraries in |
| a uniform way. The DMbuffer and DMparams descriptors are left |
| intentionally abstract so that the GLX extension can adapt to future |
| DM library changes. |
| The initial implementation will require that the DMparams descriptor |
| supply at least pixel format and packing information, and that the |
| DMbuffer provide the size and location of a colorbuffer. GLX will do |
| compatibility checking when possible based on the config, params, and |
| buffer information at associate time. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/SGIX/dmbuffer.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GLX import _types, _glgets |
| from OpenGL.raw.GLX.SGIX.dmbuffer import * |
| from OpenGL.raw.GLX.SGIX.dmbuffer import _EXTENSION_NAME |
|
|
| def glInitDmbufferSGIX(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
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| |
