glBindFragDataLocation man page on RedHat
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GLBINDFRAGDATALOCATI(3G) OpenGL Manual GLBINDFRAGDATALOCATI(3G)
NAME
glBindFragDataLocation - bind a user-defined varying out variable to a
fragment shader color number
C SPECIFICATION
void glBindFragDataLocation(GLuint program, GLuint colorNumber,
const char * name);
PARAMETERS
program
The name of the program containing varying out variable whose
binding to modify
colorNumber
The color number to bind the user-defined varying out variable to
name
The name of the user-defined varying out variable whose binding to
modify
DESCRIPTION
glBindFragDataLocation explicitly specifies the binding of the
user-defined varying out variable name to fragment shader color number
colorNumber for program program. If name was bound previously, its
assigned binding is replaced with colorNumber. name must be a
null-terminated string. colorNumber must be less than
GL_MAX_DRAW_BUFFERS.
The bindings specified by glBindFragDataLocation have no effect until
program is next linked. Bindings may be specified at any time after
program has been created. Specifically, they may be specified before
shader objects are attached to the program. Therefore, any name may be
specified in name, including a name that is never used as a varying out
variable in any fragment shader object. Names beginning with gl_ are
reserved by the GL.
In addition to the errors generated by glBindFragDataLocation, the
program program will fail to link if:
· The number of active outputs is greater than the value
GL_MAX_DRAW_BUFFERS.
· More than one varying out variable is bound to the same color
number.
NOTES
Varying out varyings may have indexed locations assigned explicitly in
the shader text using a location layout qualifier. If a shader
statically assigns a location to a varying out variable in the shader
text, that location is used and any location assigned with
glBindFragDataLocation is ignored.
ERRORS
GL_INVALID_VALUE is generated if colorNumber is greater than or equal
to GL_MAX_DRAW_BUFFERS.
GL_INVALID_OPERATION is generated if name starts with the reserved gl_
prefix.
GL_INVALID_OPERATION is generated if program is not the name of a
program object.
ASSOCIATED GETS
glGetFragDataLocation() with a valid program object and the the name of
a user-defined varying out variable
SEE ALSO
glCreateProgram(), glGetFragDataLocation()
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 GLBINDFRAGDATALOCATI(3G)
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