Class AMDQueryBufferObject
Statistics about the operation of the OpenGL pipeline, such as the number of samples that passed the depth test, the elapsed time between two events or the number of vertices written to a transform feedback buffer may be retrieved from the GL through query objects. The current value of a query object may be retrieved by the application through the OpenGL API. Should the result returned by the API be required for use in a shader, it must be passed back to the GL via a program uniform or some other mechanism. This requires a round-trip from the GPU to the CPU and back.
This extension introduces a mechanism whereby the current value of a query result may be retrieved into a buffer object instead of client memory. This allows the query result to be made available to a shader without a round-trip to the CPU for example by subsequently using the buffer object as a uniform buffer, texture buffer or other data store visible to the shader. This functionality may also be used to place the results of many query objects into a single, large buffer and then map or otherwise read back the entire buffer at a later point in time, avoiding a per-query CPU-GPU synchronization event.
The result of any query object type supported by the GL implementation may be retrieved into a buffer object. The implementation will determine the most efficient method of copying the query result to the buffer.
Requires OpenGL 1.5
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
Accepted by thetarget
parameters of BindBuffer, BufferData, BufferSubData, MapBuffer, UnmapBuffer, MapBufferRange, GetBufferSubData, GetBufferParameteriv and GetBufferPointerv.static final int
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev.static final int
Accepted by thepname
parameter of GetQueryObjectiv, GetQueryObjectuiv, GetQueryObjecti64v and GetQueryObjectui64v. -
Method Summary
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Field Details
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GL_QUERY_RESULT_NO_WAIT_AMD
public static final int GL_QUERY_RESULT_NO_WAIT_AMDAccepted by thepname
parameter of GetQueryObjectiv, GetQueryObjectuiv, GetQueryObjecti64v and GetQueryObjectui64v.- See Also:
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GL_QUERY_BUFFER_AMD
public static final int GL_QUERY_BUFFER_AMDAccepted by thetarget
parameters of BindBuffer, BufferData, BufferSubData, MapBuffer, UnmapBuffer, MapBufferRange, GetBufferSubData, GetBufferParameteriv and GetBufferPointerv.- See Also:
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GL_QUERY_BUFFER_BINDING_AMD
public static final int GL_QUERY_BUFFER_BINDING_AMDAccepted by thepname
parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev.- See Also:
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