glDrawTransformFeedbackStream — render primitives using a count derived from a specifed stream of a transform feedback object
void glDrawTransformFeedbackStream( | GLenum | mode, |
| GLuint | id, | |
| GLuint | stream); |
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.
idSpecifies the name of a transform feedback object from which to retrieve a primitive count.
streamSpecifies the index of the transform feedback stream from which to retrieve a primitive count.
glDrawTransformFeedbackStream draws 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 glDrawTransformFeedbackStream
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 stream the last time transform feedback was active on the transform feedback object named
by id.
Calling glDrawTransformFeedback is equivalent to calling glDrawTransformFeedbackStream
with stream set to zero.
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.
glDrawArrays, glDrawArraysInstanced, glDrawElements, glDrawRangeElements, glDrawTransformFeedback
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/.