org.lwjgl.opengles

Class NVInstancedArrays

java.lang.Object

org.lwjgl.opengles.NVInstancedArrays

public class NVInstancedArrays
extends java.lang.Object

Native bindings to the NV_instanced_arrays extension.

A common use case in GL for some applications is to be able to draw the same object, or groups of similar objects that share vertex data, primitive count and type, multiple times. This extension provides a means of accelerating such use cases while limiting the number of required API calls, and keeping the amount of duplicate data to a minimum.

In particular, this extension specifies an alternative to the read-only shader variable introduced by NV_draw_instanced. It uses the same draw calls introduced by that extension, but redefines them so that a vertex shader can instead use vertex array attributes as a source of instance data.

This extension introduces an array "divisor" for generic vertex array attributes, which when non-zero specifies that the attribute is "instanced." An instanced attribute does not advance per-vertex as usual, but rather after every divisor conceptual draw calls.

(Attributes which aren't instanced are repeated in their entirety for every conceptual draw call.)

By specifying transform data in an instanced attribute or series of instanced attributes, vertex shaders can, in concert with the instancing draw calls, draw multiple instances of an object with one draw call.

Requires GLES 2.0.

Field Summary

Fields

Modifier and Type	Field and Description
static int	GL_VERTEX_ATTRIB_ARRAY_DIVISOR_NV Accepted by the pname parameters of GetVertexAttribfv, and GetVertexAttribiv.

Method Summary

Modifier and Type	Method and Description
static void	glVertexAttribDivisorNV(int index, int divisor)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GL_VERTEX_ATTRIB_ARRAY_DIVISOR_NV

public static final int GL_VERTEX_ATTRIB_ARRAY_DIVISOR_NV

Accepted by the pname parameters of GetVertexAttribfv, and GetVertexAttribiv.

See Also:

Constant Field Values

Method Detail

glVertexAttribDivisorNV

public static void glVertexAttribDivisorNV(int index,
                                           int divisor)