glNormalPointer(3g)

1GLNORMALPOINTER(3G)                                        GLNORMALPOINTER(3G)
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NAME

6       glNormalPointer - define an array of normals
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C SPECIFICATION

10       void glNormalPointer( GLenum type,
11                             GLsizei stride,
12                             const GLvoid *ptr )
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PARAMETERS

16       type    Specifies  the data type of each coordinate in the array.  Sym‐
17               bolic  constants  GL_BYTE,  GL_SHORT,  GL_INT,  GL_FLOAT,   and
18               GL_DOUBLE are accepted. The initial value is GL_FLOAT.
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20       stride  Specifies  the  byte  offset  between  consecutive  normals. If
21               stride is 0- the initial value-the normals are understood to be
22               tightly packed in the array.  The initial value is 0.
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24       ptr     Specifies a pointer to the first coordinate of the first normal
25               in the array.  The initial value is 0.
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DESCRIPTION

28       glNormalPointer specifies the location and data  of an array of normals
29       to  use  when  rendering.   type  specifies the data type of the normal
30       coordinates and stride gives the byte stride from  one  normal  to  the
31       next, allowing vertices and attributes to be packed into a single array
32       or stored in separate arrays.  (Single-array storage may be more  effi‐
33       cient on some implementations; see glInterleavedArrays.)  When a normal
34       array is specified, type, stride, and  ptr  are  saved  as  client-side
35       state.
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37       To  enable  and  disable the normal array, call glEnableClientState and
38       glDisableClientState with the argument GL_NORMAL_ARRAY. If enabled, the
39       normal   array   is   used   when   glDrawArrays,   glDrawElements,  or
40       glArrayElement is called.
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42       Use glDrawArrays to construct a sequence of primitives (all of the same
43       type)  from  prespecified  vertex  and  vertex  attribute  arrays.  Use
44       glArrayElement to specify primitives by indexing  vertices  and  vertex
45       attributes  and glDrawElements to construct a sequence of primitives by
46       indexing vertices and vertex attributes.
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NOTES

49       glNormalPointer is available only if the GL version is 1.1 or greater.
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51       The  normal  array  is  initially  disabled  and  isn't  accessed  when
52       glArrayElement, glDrawElements, or glDrawArrays is called.
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54       Execution  of  glNormalPointer  is  not allowed between glBegin and the
55       corresponding glEnd, but an error may or may not be  generated.  If  an
56       error is not generated, the operation is undefined.
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58       glNormalPointer is typically implemented on the client side.
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60       Since  the  normal array parameters are client-side state, they are not
61       saved   or   restored   by   glPushAttrib   and    glPopAttrib.     Use
62       glPushClientAttrib and glPopClientAttrib instead.
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ERRORS

65       GL_INVALID_ENUM is generated if type is not an accepted value.
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67       GL_INVALID_VALUE is generated if stride is negative.
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ASSOCIATED GETS

70       glIsEnabled with argument GL_NORMAL_ARRAY
71       glGet with argument GL_NORMAL_ARRAY_TYPE
72       glGet with argument GL_NORMAL_ARRAY_STRIDE
73       glGetPointerv with argument GL_NORMAL_ARRAY_POINTER
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