glGetUniformBlockIndex — retrieve the index of a named uniform block
GLuint glGetUniformBlockIndex( | GLuint program, |
const GLchar *uniformBlockName) ; |
program
Specifies the name of a program containing the uniform block.
uniformBlockName
Specifies the address an array of characters to containing the name of the uniform block whose index to retrieve.
glGetUniformBlockIndex
retrieves the index of a uniform block within program
.
program
must be the name of a program object for which the command
glLinkProgram must have been called in the past, although it is not required that
glLinkProgram must have succeeded. The link could have failed because the number
of active uniforms exceeded the limit.
uniformBlockName
must contain a nul-terminated string specifying the name of the uniform block.
glGetUniformBlockIndex
returns the uniform block index for the uniform block named uniformBlockName
of program
. If uniformBlockName
does not identify an active uniform block of program
,
glGetUniformBlockIndex
returns the special identifier, GL_INVALID_INDEX
. Indices of the active uniform
blocks of a program are assigned in consecutive order, beginning with zero.
GL_INVALID_OPERATION
is generated if program
is not the name of a program object for which
glLinkProgram has been called in the past.
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/.