glGetAttribLocation.3G - Online Linux Manual Page

GLGETATTRIBLOCATION - Online Linux Manual PageSection : 3G
Updated : 01/20/2022
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NAMEglGetAttribLocation − Returns the location of an attribute variable

C SPECIFICATIONGLint glGetAttribLocation(GLuint program, const GLchar *name);

PARAMETERSprogram Specifies the program object to be queried. name Points to a null terminated string containing the name of the attribute variable whose location is to be queried.

DESCRIPTIONglGetAttribLocation queries the previously linked program object specified by program for the attribute variable specified by name and returns the index of the generic vertex attribute that is bound to that attribute variable. If name is a matrix attribute variable, the index of the first column of the matrix is returned. If the named attribute variable is not an active attribute in the specified program object or if name starts with the reserved prefix "gl_", a value of −1 is returned. The association between an attribute variable name and a generic attribute index can be specified at any time by calling glBindAttribLocation(). Attribute bindings do not go into effect until glLinkProgram() is called. After a program object has been linked successfully, the index values for attribute variables remain fixed until the next link command occurs. The attribute values can only be queried after a link if the link was successful. glGetAttribLocation returns the binding that actually went into effect the last time glLinkProgram() was called for the specified program object. Attribute bindings that have been specified since the last link operation are not returned by glGetAttribLocation.

ERRORSGL_INVALID_OPERATION is generated if program is not a value generated by OpenGL. GL_INVALID_OPERATION is generated if program is not a program object. GL_INVALID_OPERATION is generated if program has not been successfully linked.

ASSOCIATED GETSglGetActiveAttrib() with argument program and the index of an active attribute glIsProgram()

VERSION SUPPORT OpenGL Version Function / Feature Name 2.0 none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'> 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5 glGetAttribLocation ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

SEE ALSOglBindAttribLocation(), glLinkProgram(), glVertexAttrib(), glVertexAttribPointer()

COPYRIGHTCopyright © 2003−2005 3Dlabs Inc. Ltd. 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/.

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