glGetUniformBlockIndex — retrieve the index of a named uniform block
| ||GLuint program,|
|const GLchar *uniformBlockName |
Specifies the name of a program containing the uniform block.
Specifies the address an array of characters containing the name of the uniform block whose index to retrieve.
glGetUniformBlockIndex retrieves the index of a uniform block within
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 does not identify an active uniform block of
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.
|OpenGL ES API Version|
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