Provided by: opengl-4-man-doc_1.0~svn31251-1build1_all 
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()
VERSION SUPPORT
┌────────────────────────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├────────────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glTransformFeedbackVaryings │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
└────────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glBeginTransformFeedback(), glEndTransformFeedback(), glGetTransformFeedbackVarying()
COPYRIGHT
Copyright © 2010-2014 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/.
COPYRIGHT
Copyright © 2010-2014 Khronos Group
[FIXME: source] 07/22/2015 GLTRANSFORMFEEDBACKV(3G)