glBindFragDataLocation - bind a user-defined varying out variable to a fragment
shader color number
const char * name);
The name of the program containing varying out variable
whose binding to modify
The color number to bind the user-defined varying out
The name of the user-defined varying out variable whose
binding to modify
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
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
•The number of active outputs is greater than the
•More than one varying out variable is bound to
the same color number.
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.
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.
glGetFragDataLocation() with a valid program object and the name of a
user-defined varying out variable
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 © 2010-2014 Khronos Group
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