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glGetFragDataLocation

Name

glGetFragDataLocation — query the bindings of color numbers to user-defined varying out variables

C Specification

GLint glGetFragDataLocation( GLuint program,
  const char * name);
 

Parameters

program

The name of the program containing varying out variable whose binding to query

name

The name of the user-defined varying out variable whose binding to query

Description

glGetFragDataLocation retrieves the assigned color number binding for the user-defined varying out variable name for program program. program must have previously been linked. name must be a null-terminated string. If name is not the name of an active user-defined varying out fragment shader variable within program, -1 will be returned.

Notes

In OpenGL ES Shading Language version 3.00, output variables must be explicitly bound to fragment colors within the shader text. This query simply returns that binding information.

Errors

GL_INVALID_OPERATION is generated if program is not the name of a program object.

API Version Support

OpenGL ES API Version
Function Name 2.0 3.0 3.1
glGetFragDataLocation -

See Also

glCreateProgram,

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