GLVERTEXPOINTER() MachTen Programmer’s Manual GLVERTEXPOINTER()

NAME
glVertexPointer - define an array of vertex data

C SPECIFICATION
void glVertexPointer( GLint size,
GLenum type,
GLsizei stride,
const GLvoid *pointer )

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PARAMETERS
size Specifies the number of coordinates per vertex;
must be 2, 3, or 4. The initial value is 4.

type Specifies the data type of each coordinate in the
array. Symbolic constants GL_SHORT, GL_INT,
GL_FLOAT, and GL_DOUBLE are accepted. The initial
value is GL_FLOAT.

stride Specifies the byte offset between consecutive
vertexes. If stride is 0, the vertexes are under-
stood to be tightly packed in the array. The ini-
tial value
is 0.

pointer Specifies a pointer to the first coordinate of
the first vertex in the array.

DESCRIPTION
glVertexPointer specifies the location and data format of
an array of vertex coordinates to use when rendering.
size specifies the number of coordinates per vertex and
type the data type of the coordinates. stride specifies
the byte stride from one vertex to the next allowing ver-
texes and attributes to be packed into a single array or
stored in separate arrays. (Single-array storage may be
more efficient on some implementations; see glInter-
leavedArrays.) When a vertex array is specified, size,
type, stride, and pointer are saved as client-side state.

To enable and disable the vertex array, call glEnable-
ClientState and
glDisableClientState with the argument GL_VERTEX_ARRAY. If
enabled, the vertex array is used when glDrawArrays,
glDrawElements, or glArrayElement is called.

Use glDrawArrays to construct a sequence of primitives
(all of the same type) from prespecified vertex and vertex
attribute arrays. Use glArrayElement to specify primi-
tives by indexing vertexes and vertex attributes and
glDrawElements to construct a sequence of primitives by
indexing vertexes and vertex attributes.

NOTES
glVertexPointer is available only if the GL version is 1.1
or greater.

The vertex array is initially disabled and isn’t accessed
when glArrayElement, glDrawElements or glDrawArrays is
called.

Execution of glVertexPointer is not allowed between the
execution of glBegin and the corresponding execution of
glEnd, but an error may or may not be generated. If no
error is generated, the operation is undefined.

glVertexPointer is typically implemented on the client
side.

Vertex array parameters are client-side state and are
therefore not saved or restored by glPushAttrib and
glPopAttrib. Use glPushClientAttrib and glPopClientAttrib
instead.

ERRORS
GL_INVALID_VALUE is generated if size is not 2, 3, or 4.

GL_INVALID_ENUM is generated if type is is not an accepted
value.

GL_INVALID_VALUE is generated if stride is negative.

ASSOCIATED GETS
glIsEnabled with argument GL_VERTEX_ARRAY
glGet with argument GL_VERTEX_ARRAY_SIZE
glGet with argument GL_VERTEX_ARRAY_TYPE
glGet with argument GL_VERTEX_ARRAY_STRIDE
glGetPointerv with argument GL_VERTEX_ARRAY_POINTER

SEE ALSO
glArrayElement, glColorPointer, glDrawArrays, glDrawEle-
ments,
glEdgeFlagPointer, glEnable, glGetPointerv, glIndex-
Pointer,
glInterleavedArrays, glNormalPointer, glPopClientAttrib,
glPushClientAttrib, glTexCoordPointer

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