GLTRANSFORMFEEDBACKV(3G)        [FIXME: manual]       GLTRANSFORMFEEDBACKV(3G)

NAME
       glTransformFeedbackVaryings - specify values to record in transform
       feedback buffers

C SPECIFICATION
       void glTransformFeedbackVaryings(GLuint program, GLsizei count,
                                        const char **varyings,
                                        GLenum bufferMode);

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.

       glTransformFeedbackVaryings can also special identifiers if bufferMode
       is GL_INTERLEAVED_ATTRIBS:

       gl_NextBuffer
           Subsequent variables in varyings will be assigned to the next
           buffer binding point.

       gl_SkipComponents#
           Where # may be 1, 2, 3, or 4. The variable is treated as having
           this number of components, but the contents of the memory are
           preserved under feedback operations.

       In addition to the errors generated by glTransformFeedbackVaryings, the
       program program will fail to link if:

       o   The count specified by glTransformFeedbackVaryings is non-zero, but
           the program object has no vertex or geometry shader.

       o   Any variable name specified in the varyings array is not declared
           as an output in the vertex shader (or the geometry shader, if
           active), or is not one of the special identifiers listed above.

       o   Special identifiers appear in a varyings array where bufferMode is
           not GL_INTERLEAVED_ATTRIBS.

       o   Any two entries in the varyings array, which are not one of the
           special varyings above, specify the same varying variable.

       o   Discounting any special identifiers, 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.

       o   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 / Feature Name     | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
       +----------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glTransformFeedbackVaryings |  -  |  -  | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> |
       +----------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

SEE ALSO
       glBeginTransformFeedback(),

       glEndTransformFeedback, glGetTransformFeedbackVarying()

COPYRIGHT
       Copyright (C) 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.  https://opencontent.org/openpub/.

COPYRIGHT
       Copyright (C) 2010-2014 Khronos Group

[FIXME: source]                   10/20/2024          GLTRANSFORMFEEDBACKV(3G)