glTransformFeedbackVaryings man page on RedHat
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GLTRANSFORMFEEDBACKV(3G) OpenGL Manual GLTRANSFORMFEEDBACKV(3G)
NAME
glTransformFeedbackVaryings - specify values to record in transform
feedback buffers
C SPECIFICATION
void glTransformFeedbackVaryings(GLuintprogram, GLsizeicount,
const char **varyings,
GLenumbufferMode);
PARAMETERS
program
The name of the target program object.
count
The number of varying variables used for transform feedback.
varyings
An array of count zero-terminated strings specifying the names of
the varying variables to use for transform feedback.
bufferMode
Identifies the mode used to capture the varying variables when
transform feedback is active. bufferMode must be
GL_INTERLEAVED_ATTRIBS or GL_SEPARATE_ATTRIBS.
DESCRIPTION
The names of the vertex or geometry shader outputs to be recorded in
transform feedback mode are specified using
glTransformFeedbackVaryings. When a geometry shader is active,
transform feedback records the values of selected geometry shader
output variables from the emitted vertices. Otherwise, the values of
the selected vertex shader outputs are recorded.
The state set by glTranformFeedbackVaryings is stored and takes effect
next time glLinkProgram() is called on program. When glLinkProgram() is
called, program is linked so that the values of the specified varying
variables for the vertices of each primitive generated by the GL are
written to a single buffer object if bufferMode is
GL_INTERLEAVED_ATTRIBS or multiple buffer objects if bufferMode is
GL_SEPARATE_ATTRIBS.
In addition to the errors generated by glTransformFeedbackVaryings, the
program program will fail to link if:
· The count specified by glTransformFeedbackVaryings is non-zero, but
the program object has no vertex or geometry shader.
· Any variable name specified in the varyings array is not declared
as an output in the vertex shader (or the geometry shader, if
active).
· Any two entries in the varyings array specify the same varying
variable.
· The total number of components to capture in any varying variable
in varyings is greater than the constant
GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS and the buffer mode
is GL_SEPARATE_ATTRIBS.
· The total number of components to capture is greater than the
constant GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS and the
buffer mode is GL_INTERLEAVED_ATTRIBS.
NOTES
glGetTransformFeedbackVarying is available only if the GL version is
3.0 or greater.
ERRORS
GL_INVALID_VALUE is generated if program is not the name of a program
object.
GL_INVALID_VALUE is generated if bufferMode is GL_SEPARATE_ATTRIBS and
count is greater than the implementation-dependent limit
GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS.
ASSOCIATED GETS
glGetTransformFeedbackVarying()
SEE ALSO
glBeginTransformFeedback(), glEndTransformFeedback(),
glGetTransformFeedbackVarying()
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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLTRANSFORMFEEDBACKV(3G)
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