Class pyglet.graphics.vertexattribute.AbstractAttribute

Known Subclasses:: ColorAttribute, EdgeFlagAttribute, FogCoordAttribute, GenericAttribute, NormalAttribute, SecondaryColorAttribute, TexCoordAttribute, VertexAttribute

Abstract accessor for an attribute in a mapped buffer.

Methods

	__init__(self, count, gl_type) Create the attribute accessor.
	enable(self) Enable the attribute using `glEnableClientState`.
	set_pointer(self, offset) Setup this attribute to point to the currently bound buffer at the given offset.
AbstractBufferRegion	get_region(self, buffer, start, count) Map a buffer region using this attribute as an accessor.
	set_region(self, buffer, start, count, data) Set the data over a region of the buffer.

Method Details

init

(Constructor) __init__(self, count, gl_type)

Create the attribute accessor.

Parameters:

count : int: Number of components in the attribute.
gl_type : int: OpenGL type enumerant; for example, GL_FLOAT

set_pointer

set_pointer(self, offset)

Setup this attribute to point to the currently bound buffer at the given offset.

offset should be based on the currently bound buffer's ptr member.

Parameters:

offset : int: Pointer offset to the currently bound buffer for this attribute.

get_region

get_region(self, buffer, start, count)

Map a buffer region using this attribute as an accessor.

The returned region can be modified as if the buffer was a contiguous array of this attribute (though it may actually be interleaved or otherwise non-contiguous).

The returned region consists of a contiguous array of component data elements. For example, if this attribute uses 3 floats per vertex, and the count parameter is 4, the number of floats mapped will be 3 * 4 = 12.

Parameters:

buffer : AbstractMappable: The buffer to map.
start : int: Offset of the first vertex to map.
count : int: Number of vertices to map

Returns: AbstractBufferRegion

set_region

set_region(self, buffer, start, count, data)

Set the data over a region of the buffer.

Parameters:

buffer : AbstractMappable`: The buffer to modify.
start : int: Offset of the first vertex to set.
count : int: Number of vertices to set.
data : sequence: Sequence of data components.