NAME¶
glDrawTransformFeedback - render primitives using a count derived from a
transform feedback object
C SPECIFICATION¶
void
glDrawTransformFeedback(GLenum mode,
GLuint id);
PARAMETERS¶
mode
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.
id
Specifies the name of a transform feedback
object from which to retrieve a primitive count.
DESCRIPTION¶
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.
ERRORS¶
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.
SEE ALSO¶
glDrawArrays(),
glDrawArraysInstanced(),
glDrawElements(),
glDrawRangeElements(),
glDrawTransformFeedbackStream()
COPYRIGHT¶
Copyright © 2010 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/.
