Signature
glVertexAttribPointer(
GLuint (
index
)
,
GLint (
size
)
,
GLenum (
type
)
,
GLboolean (
normalized
)
,
GLsizei (
stride
)
,
const GLvoid * (
pointer
)
)-> void
glVertexAttribPointer(
index
,
size
,
type
,
normalized
,
stride
,
pointer
)
Set an attribute pointer for a given shader (index)
index -- the index of the generic vertex to bind, see
glGetAttribLocation for retrieval of the value,
note that index is a global variable, not per-shader
size -- number of basic elements per record, 1,2,3, or 4
type -- enum constant for data-type
normalized -- whether to perform int to float
normalization on integer-type values
stride -- stride in machine units (bytes) between
consecutive records, normally used to create
"interleaved" arrays
pointer -- data-pointer which provides the data-values,
normally a vertex-buffer-object or offset into the
same.
This implementation stores a copy of the data-pointer
in the contextdata structure in order to prevent null-
reference errors in the renderer.
Parameters
| Variables | Description |
|---|---|
| index |
Specifies the index of the generic vertex
attribute to be modified.
|
| size |
Specifies the number of components per
generic vertex attribute. Must
be 1, 2, 3, 4. Additionally, the symbolic constant
GL_BGRA
is accepted by
glVertexAttribPointer
. The initial value is 4.
|
| type |
Specifies the data type of each component in
the array. The symbolic constants
GL_BYTE
,
GL_UNSIGNED_BYTE
,
GL_SHORT
,
GL_UNSIGNED_SHORT
,
GL_INT
, and
GL_UNSIGNED_INT
are accepted by
glVertexAttribPointer
and
glVertexAttribIPointer
. Additionally
GL_HALF_FLOAT
,
GL_FLOAT
,
GL_DOUBLE
,
GL_FIXED
,
GL_INT_2_10_10_10_REV
,
GL_UNSIGNED_INT_2_10_10_10_REV
and
GL_UNSIGNED_INT_10F_11F_11F_REV
are accepted by
glVertexAttribPointer
.
GL_DOUBLE
is also accepted by
glVertexAttribLPointer
and is
the only token accepted by the
type
parameter for that function.
The initial value is
GL_FLOAT
.
|
| normalized |
For
glVertexAttribPointer
, specifies whether fixed-point data values
should be normalized (
GL_TRUE
)
or converted directly as fixed-point values
(
GL_FALSE
) when they are
accessed.
|
| stride |
Specifies the byte offset between consecutive
generic vertex attributes. If
stride
is 0, the generic vertex attributes are
understood to be tightly packed in the
array. The initial value is 0.
|
| pointer |
Specifies a offset of the first component of the first generic vertex attribute in the array in the data store of the
buffer currently bound to the
GL_ARRAY_BUFFER
target. The initial value is 0.
|
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
glVertexAttribPointer