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OES_draw_buffers_indexed: enableiOES() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨December 2022⁩.

The enableiOES() method of the OES_draw_buffers_indexed WebGL extension enables blending for a particular draw buffer.

Syntax

enableiOES(target, index)

Parameters

target

Must be gl.BLEND.

index

An integer i specifying the draw buffer associated with the constant gl.DRAW_BUFFERi, see WebGL draw buffer constants.

Return value

None (undefined).

Exceptions

  • If target is not gl.BLEND, a gl.INVALID_ENUM error is thrown.
  • If index is not a valid value, a gl.INVALID_VALUE error is thrown.

Examples

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Enabling blending for draw buffers

The following two calls enable blending for the draw buffers gl.DRAW_BUFFER0 and gl.DRAW_BUFFER1.

const ext = gl.getExtension("OES_draw_buffers_indexed");

ext.enableiOES(gl.BLEND, 0);
ext.enableiOES(gl.BLEND, 1);

You can use WebGLRenderingContext.getParameter() to see how many draw buffers are available.

const maxDrawBuffers = gl.getParameter(gl.MAX_DRAW_BUFFERS);

Specifications

Specification
WebGL OES_draw_buffers_indexed Extension Specification>

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android WebView on iOS
enableiOES 100 100 108 86 16 100 108 69 16 19.0 100 16

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/OES_draw_buffers_indexed/enableiOES