glGetActiveUniformName — query the name of an active uniform
void glGetActiveUniformName( | GLuint | program, |
| GLuint | uniformIndex, | |
| GLsizei | bufSize, | |
| GLsizei * | length, | |
| GLchar * | uniformName); |
program
Specifies the program containing the active uniform index uniformIndex.
uniformIndexSpecifies the index of the active uniform whose name to query.
bufSize
Specifies the size of the buffer, in units of GLchar, of the buffer whose address is specified in uniformName.
length
Specifies the address of a variable that will receive the number of characters that were or would have been written to the buffer addressed by uniformName.
uniformName
Specifies the address of a buffer into which the GL will place the name of the active uniform at uniformIndex within program.
glGetActiveUniformName returns the name of the active uniform at uniformIndex within program.
If uniformName is not NULL, up to bufSize characters (including a nul-terminator) will be written into
the array whose address is specified by uniformName. If length is not NULL, the number of characters
that were (or would have been) written into uniformName (not including the nul-terminator) will be placed in the variable whose address
is specified in length. If length is NULL, no length is returned. The length of the longest uniform
name in program is given by the value of GL_ACTIVE_UNIFORM_MAX_LENGTH, which can be queried with
glGetProgram.
If glGetActiveUniformName is not successful, nothing is written to length or uniformName.
program must be the name of a program for which the command glLinkProgram
has been issued in the past. It is not necessary for program to have been linked successfully. The link could have failed because
the number of active uniforms exceeded the limit.
uniformIndex must be an active uniform index of the program program, in the range zero to
GL_ACTIVE_UNIFORMS - 1. The value of GL_ACTIVE_UNIFORMS can be queried with
glGetProgram.
GL_INVALID_VALUE is generated if uniformIndex is greater than or equal to the value
of GL_ACTIVE_UNIFORMS.
GL_INVALID_VALUE is generated if bufSize is negative.
GL_INVALID_VALUE is generated if program is not the name of a program object for which
glLinkProgram has been issued.
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/.