Difference between revisions of "GLAPI/glDrawTransformFeedbackStream"

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Revision as of 03:32, 26 February 2012

glDrawTransformFeedbackStream
Core in version 4.5
Core since version 4.0
Core ARB extension ARB_transform_feedback3

glDrawTransformFeedbackStream: render primitives using a count derived from a specifed stream of a transform feedback object

Function Definition

 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.
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/.