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/.

AUTHORS

       opengl.org