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GLGETVERTEXATTRIB(3G)			  OpenGL Manual 		    GLGETVERTEXATTRIB(3G)

NAME
       glGetVertexAttribdv, glGetVertexAttribfv, glGetVertexAttribiv, glGetVertexAttribIiv,
       glGetVertexAttribIuiv, glGetVertexAttribLdv - Return a generic vertex attribute parameter

C SPECIFICATION
       void glGetVertexAttribdv(GLuint index, GLenum pname, GLdouble *params);

       void glGetVertexAttribfv(GLuint index, GLenum pname, GLfloat *params);

       void glGetVertexAttribiv(GLuint index, GLenum pname, GLint *params);

       void glGetVertexAttribIiv(GLuint index, GLenum pname, GLint *params);

       void glGetVertexAttribIuiv(GLuint index, GLenum pname, GLuint *params);

       void glGetVertexAttribLdv(GLuint index, GLenum pname, GLdouble *params);

PARAMETERS
       index
	   Specifies the generic vertex attribute parameter to be queried.

       pname
	   Specifies the symbolic name of the vertex attribute parameter to be queried. Accepted
	   values are GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, GL_VERTEX_ATTRIB_ARRAY_ENABLED,
	   GL_VERTEX_ATTRIB_ARRAY_SIZE, GL_VERTEX_ATTRIB_ARRAY_STRIDE,
	   GL_VERTEX_ATTRIB_ARRAY_TYPE, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED,
	   GL_VERTEX_ATTRIB_ARRAY_INTEGER, GL_VERTEX_ATTRIB_ARRAY_DIVISOR, or
	   GL_CURRENT_VERTEX_ATTRIB.

       params
	   Returns the requested data.

DESCRIPTION
       glGetVertexAttrib returns in params the value of a generic vertex attribute parameter. The
       generic vertex attribute to be queried is specified by index, and the parameter to be
       queried is specified by pname.

       The accepted parameter names are as follows:

       GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING

	   params returns a single value, the name of the buffer object currently bound to the
	   binding point corresponding to generic vertex attribute array index. If no buffer
	   object is bound, 0 is returned. The initial value is 0.

       GL_VERTEX_ATTRIB_ARRAY_ENABLED

	   params returns a single value that is non-zero (true) if the vertex attribute array
	   for index is enabled and 0 (false) if it is disabled. The initial value is GL_FALSE.

       GL_VERTEX_ATTRIB_ARRAY_SIZE

	   params returns a single value, the size of the vertex attribute array for index. The
	   size is the number of values for each element of the vertex attribute array, and it
	   will be 1, 2, 3, or 4. The initial value is 4.

       GL_VERTEX_ATTRIB_ARRAY_STRIDE

	   params returns a single value, the array stride for (number of bytes between
	   successive elements in) the vertex attribute array for index. A value of 0 indicates
	   that the array elements are stored sequentially in memory. The initial value is 0.

       GL_VERTEX_ATTRIB_ARRAY_TYPE

	   params returns a single value, a symbolic constant indicating the array type for the
	   vertex attribute array for index. Possible values are GL_BYTE, GL_UNSIGNED_BYTE,
	   GL_SHORT, GL_UNSIGNED_SHORT, GL_INT, GL_UNSIGNED_INT, GL_FLOAT, and GL_DOUBLE. The
	   initial value is GL_FLOAT.

       GL_VERTEX_ATTRIB_ARRAY_NORMALIZED

	   params returns a single value that is non-zero (true) if fixed-point data types for
	   the vertex attribute array indicated by index are normalized when they are converted
	   to floating point, and 0 (false) otherwise. The initial value is GL_FALSE.

       GL_VERTEX_ATTRIB_ARRAY_INTEGER

	   params returns a single value that is non-zero (true) if fixed-point data types for
	   the vertex attribute array indicated by index have integer data types, and 0 (false)
	   otherwise. The initial value is 0 (GL_FALSE).

       GL_VERTEX_ATTRIB_ARRAY_DIVISOR

	   params returns a single value that is the frequency divisor used for instanced
	   rendering. See glVertexAttribDivisor(). The initial value is 0.

       GL_CURRENT_VERTEX_ATTRIB

	   params returns four values that represent the current value for the generic vertex
	   attribute specified by index. Generic vertex attribute 0 is unique in that it has no
	   current state, so an error will be generated if index is 0. The initial value for all
	   other generic vertex attributes is (0,0,0,1).

	   glGetVertexAttribdv and glGetVertexAttribfv return the current attribute values as
	   four single-precision floating-point values; glGetVertexAttribiv reads them as
	   floating-point values and converts them to four integer values; glGetVertexAttribIiv
	   and glGetVertexAttribIuiv read and return them as signed or unsigned integer values,
	   respectively; glGetVertexAttribLdv reads and returns them as four double-precision
	   floating-point values.

       All of the parameters except GL_CURRENT_VERTEX_ATTRIB represent state stored in the
       currently bound vertex array object.

NOTES
       If an error is generated, no change is made to the contents of params.

ERRORS
       GL_INVALID_OPERATION is generated if pname is not GL_CURRENT_VERTEX_ATTRIB and there is no
       currently bound vertex array object.

       GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS.

       GL_INVALID_ENUM is generated if pname is not an accepted value.

       GL_INVALID_OPERATION is generated if index is 0 and pname is GL_CURRENT_VERTEX_ATTRIB.

ASSOCIATED GETS
       glGet() with argument GL_MAX_VERTEX_ATTRIBS

       glGetVertexAttribPointerv() with arguments index and GL_VERTEX_ATTRIB_ARRAY_POINTER

SEE ALSO
       glBindAttribLocation(), glBindBuffer(), glDisableVertexAttribArray(),
       glEnableVertexAttribArray(), glVertexAttrib(), glVertexAttribDivisor(),
       glVertexAttribPointer()

COPYRIGHT
       Copyright (C) 2003-2005 3Dlabs Inc. Ltd. Copyright (C) 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/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014			    GLGETVERTEXATTRIB(3G)
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