NAME

       glDrawTransformFeedbackInstanced - render multiple instances of primitives using a count
       derived from a transform feedback object

C SPECIFICATION

       void glDrawTransformFeedbackInstanced(GLenum mode, GLuint id, GLsizei primcount);

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.

       primcount
           Specifies the number of instances of the geometry to render.

DESCRIPTION

       glDrawTransformFeedbackInstanced draws multiple copies of a range of primitives of a type
       specified by mode using a count retrieved from the transform feedback stream specified by
       stream of the transform feedback object specified by id. Calling
       glDrawTransformFeedbackInstanced is equivalent to calling glDrawArraysInstanced() with
       mode and primcount 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.

       Calling () is equivalent to calling glDrawTransformFeedbackStreamInstanced with stream set
       to zero.

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_VALUE is generated if stream is greater than or equal to the value of
       GL_MAX_VERTEX_STREAMS.

       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(),
       glDrawTransformFeedback(), glDrawTransformFeedbackStreamInstanced().

COPYRIGHT

       Copyright © 2010-2011 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