GLAPI/glDrawTransformFeedback: Difference between revisions
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== Function Definition == | == Function Definition == | ||
void '''glDrawTransformFeedback'''(GLenum | void '''glDrawTransformFeedback'''(GLenum {{param|mode}}, GLuint {{param|id}}); | ||
; mode | ; mode | ||
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== Description == | == Description == | ||
'''glDrawTransformFeedback''' draws primitives of a type specified by | '''glDrawTransformFeedback''' draws primitives of a type specified by {{param|mode}} using a count retrieved from the transform feedback specified by {{param|id}}. Calling '''glDrawTransformFeedback''' is equivalent to calling {{apifunc|glDrawArrays}} with {{param|mode}} as specified, {{param|first}} set to zero, and {{param|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 {{param|id}}. | ||
== Errors == | == Errors == | ||
{{code|GL_INVALID_ENUM}} is generated if | {{code|GL_INVALID_ENUM}} is generated if {{param|mode}} is not an accepted value. | ||
{{code|GL_INVALID_VALUE}} is generated if | {{code|GL_INVALID_VALUE}} is generated if {{param|id}} is not the name of a transform feedback object. | ||
{{code|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. | {{code|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. | ||
{{code|GL_INVALID_OPERATION}} is generated if a geometry shader is active and | {{code|GL_INVALID_OPERATION}} is generated if a geometry shader is active and {{param|mode}} is incompatible with the input primitive type of the geometry shader in the currently installed program object. | ||
{{code|GL_INVALID_OPERATION}} is generated if | {{code|GL_INVALID_OPERATION}} is generated if {{param|mode}} is {{code|GL_PATCHES}} and no tessellation control shader is active. | ||
{{code|GL_INVALID_OPERATION}} is generated if | {{code|GL_INVALID_OPERATION}} is generated if {{apifunc|glEndTransformFeedback}} has never been called while the transform feedback object named by {{param|id}} was bound. | ||
== See Also == | == See Also == | ||
{{apifunc|glDrawArrays}}, {{apifunc|glDrawArraysInstanced}}, {{apifunc|glDrawElements}}, {{apifunc|glDrawRangeElements}}, {{apifunc|glDrawTransformFeedbackStream}} | |||
== Copyright == | == Copyright == | ||
Revision as of 01:17, 29 April 2012
| Core in version | 4.6 | |
|---|---|---|
| Core since version | 4.0 | |
| Core ARB extension | ARB_transform_feedback2 | |
glDrawTransformFeedback: render primitives using a count derived from a transform feedback object
Function Definition
void glDrawTransformFeedback(GLenum mode, GLuint id);
- 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/.