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The ANGLE_instanced_arrays extension is part of the WebGL API and allows to draw the same object, or groups of similar objects multiple times, if they share the same vertex data, primitive count and type.
WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.
Availability: This extension is only available to WebGL1 contexts. In WebGL2, the functionality of this extension is available on the WebGL2 context by default and the constants and methods are available without the "ANGLE" suffix.
Despite the name "ANGLE", this extension works on any device if the hardware supports it and not just on Windows when using the ANGLE library. "ANGLE" just indicates that this extension has been written by the ANGLE library authors.
Constants
This extension exposes one new constant, which can be used in the gl.getVertexAttrib() method:
ext.VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE- Returns a
GLintdescribing the frequency divisor used for instanced rendering when used in thegl.getVertexAttrib()as thepnameparameter.
Methods
This extension exposes three new methods.
ext.drawArraysInstancedANGLE()-
Behaves identically to
gl.drawArrays()except that multiple instances of the range of elements are executed, and the instance advances for each iteration. ext.drawElementsInstancedANGLE()-
Behaves identically to
gl.drawElements()except that multiple instances of the set of elements are executed and the instance advances between each set. ext.vertexAttribDivisorANGLE()-
Modifies the rate at which generic vertex attributes advance when rendering multiple instances of primitives with
ext.drawArraysInstancedANGLE()andext.drawElementsInstancedANGLE().
Examples
Enabling the extension:
var ext = gl.getExtension("ANGLE_instanced_arrays");
Specifications
| Specification | Status | Comment |
|---|---|---|
| ANGLE_instanced_arrays The definition of 'ANGLE_instanced_arrays' in that specification. |
Recommendation | Initial definition. |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | ? | 33 (33) | 11 | ? | ? |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | ? | ? | ? | ? | ? |