| | '''OpenGL extension NV.conditional_render |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.NV.conditional_render to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension provides support for conditional rendering based on the |
| | results of an occlusion query. This mechanism allows an application to |
| | potentially reduce the latency between the completion of an occlusion |
| | query and the rendering commands depending on its result. It additionally |
| | allows the decision of whether to render to be made without application |
| | intervention. |
| | |
| | This extension defines two new functions, BeginConditionalRenderNV and |
| | EndConditionalRenderNV, between which rendering commands may be discarded |
| | based on the results of an occlusion query. If the specified occlusion |
| | query returns a non-zero value, rendering commands between these calls are |
| | executed. If the occlusion query returns a value of zero, all rendering |
| | commands between the calls are discarded. |
| | |
| | If the occlusion query results are not available when |
| | BeginConditionalRenderNV is executed, the <mode> parameter specifies |
| | whether the GL should wait for the query to complete or should simply |
| | render the subsequent geometry unconditionally. |
| | |
| | Additionally, the extension provides a set of "by region" modes, allowing |
| | for implementations that divide rendering work by screen regions to |
| | perform the conditional query test on a region-by-region basis without |
| | checking the query results from other regions. Such a mode is useful for |
| | cases like split-frame SLI, where a frame is divided between multiple |
| | GPUs, each of which has its own occlusion query hardware. |
| | |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/NV/conditional_render.txt |
| | ''' |
| | from OpenGL import platform, constant, arrays |
| | from OpenGL import extensions, wrapper |
| | import ctypes |
| | from OpenGL.raw.GL import _types, _glgets |
| | from OpenGL.raw.GL.NV.conditional_render import * |
| | from OpenGL.raw.GL.NV.conditional_render import _EXTENSION_NAME |
| |
|
| | def glInitConditionalRenderNV(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
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| |
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| | |
