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GLTRANSFORMFEEDBACKV(3G) | [FIXME: manual] | GLTRANSFORMFEEDBACKV(3G) |
NAME¶
glTransformFeedbackVaryings - specify values to record in transform feedback buffersC SPECIFICATION¶
void glTransformFeedbackVaryings(GLuintprogram,
GLsizeicount, const char **varyings,
GLenumbufferMode);
PARAMETERS¶
programThe 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 / 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 © 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 Group08/26/2014 | [FIXME: source] |