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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 © 2003-2005 3Dlabs Inc. Ltd. 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/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		 GLGETVERTEXATTRIB(3G)
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