NAME¶
glDrawTransformFeedbackStream - render primitives using a count derived from a
specifed stream of a transform feedback object
C SPECIFICATION¶
void
glDrawTransformFeedbackStream(GLenum mode,
GLuint id, GLuint stream);
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.
stream
Specifies the index of the transform feedback
stream from which to retrieve a primitive count.
DESCRIPTION¶
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.
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()
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/.
