Class NVConditionalRender
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.
-
Field Summary
Modifier and TypeFieldDescriptionstatic final int
Accepted by themode
parameter of BeginConditionalRenderNV.static final int
Accepted by themode
parameter of BeginConditionalRenderNV.static final int
Accepted by themode
parameter of BeginConditionalRenderNV.static final int
Accepted by themode
parameter of BeginConditionalRenderNV. -
Method Summary
Modifier and TypeMethodDescriptionstatic void
glBeginConditionalRenderNV
(int id, int mode) static void
-
Field Details
-
GL_QUERY_WAIT_NV
public static final int GL_QUERY_WAIT_NVAccepted by themode
parameter of BeginConditionalRenderNV.- See Also:
-
GL_QUERY_NO_WAIT_NV
public static final int GL_QUERY_NO_WAIT_NVAccepted by themode
parameter of BeginConditionalRenderNV.- See Also:
-
GL_QUERY_BY_REGION_WAIT_NV
public static final int GL_QUERY_BY_REGION_WAIT_NVAccepted by themode
parameter of BeginConditionalRenderNV.- See Also:
-
GL_QUERY_BY_REGION_NO_WAIT_NV
public static final int GL_QUERY_BY_REGION_NO_WAIT_NVAccepted by themode
parameter of BeginConditionalRenderNV.- See Also:
-
-
Method Details
-
glBeginConditionalRenderNV
public static void glBeginConditionalRenderNV(int id, int mode) -
glEndConditionalRenderNV
public static void glEndConditionalRenderNV()
-