glDrawTransformFeedback - render primitives using a count derived from a
transform feedback object
Specifies what kind of primitives to render. Symbolic
constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP,
GL_LINES, GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY,
GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES,
GL_TRIANGLE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY, and
GL_PATCHES are accepted.
Specifies the name of a transform feedback object from
which to retrieve a primitive count.
glDrawTransformFeedback draws primitives of a type specified by
mode using a count retrieved from the transform feedback specified by
id. Calling glDrawTransformFeedback is equivalent to calling
glDrawArrays() with mode as specified, first set to zero,
and count set to the number of vertices captured on vertex stream zero
the last time transform feedback was active on the transform feedback object
named by id.
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_VALUE is generated if id is not the name
of a transform feedback object.
GL_INVALID_OPERATION is generated if a non-zero buffer
object name is bound to an enabled array and the buffer object's data store
is currently mapped.
GL_INVALID_OPERATION is generated if a geometry shader is
active and mode is incompatible with the input primitive type of the
geometry shader in the currently installed program object.
GL_INVALID_OPERATION is generated if mode is
GL_PATCHES and no tessellation control shader is active.
GL_INVALID_OPERATION is generated if
glEndTransformFeedback has never been called while the
transform feedback object named by id was bound.
glDrawArrays(), glDrawArraysInstanced(), glDrawElements(),
Copyright © 2010-2014 Khronos Group. This material may be distributed
subject to the terms and conditions set forth in the Open Publication License,
v 1.0, 8 June 1999. http://opencontent.org/openpub/.
Copyright © 2010-2014 Khronos Group.
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