WEBGL_multi_draw: multiDrawElementsInstancedWEBGL() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The WEBGL_multi_draw.multiDrawElementsInstancedWEBGL() method of the WebGL API renders multiple primitives from array data. It is identical to multiple calls to the gl.drawElementsInstanced() method.

Syntax

js
multiDrawElementsInstancedWEBGL(mode,
    countsList, countsOffset,
    type,
    firstsList, firstsOffset,
    instanceCountsList, instanceCountsOffset,
    drawCount)

Parameters

mode

A GLenum specifying the type primitive to render. Possible values are:

  • gl.POINTS: Draws a single dot.
  • gl.LINE_STRIP: Draws a straight line to the next vertex.
  • gl.LINE_LOOP: Draws a straight line to the next vertex, and connects the last vertex back to the first.
  • gl.LINES: Draws a line between a pair of vertices.
  • gl.TRIANGLE_STRIP
  • gl.TRIANGLE_FAN
  • gl.TRIANGLES: Draws a triangle for a group of three vertices.
countsList

An Int32Array or Array (of GLint) specifying a list of numbers of indices to be rendered.

countsOffset

A GLUint defining the starting point into the countsList array.

type

A GLenum specifying the type of the values in the element array buffer. Possible values are:

offsetsList

An Int32Array or Array (of GLsizei) specifying a list of starting indices for the arrays of vector points.

offsetsOffset

A GLuint defining the starting point into the offsetsList array.

instanceCountsList

An Int32Array or Array (of GLsizei) specifying a list of numbers of instances of the range of elements to execute.

instanceCountsOffset

A GLuint defining the starting point into the instanceCountsList array.

drawCount

A GLsizei specifying the number of instances of the range of elements to execute.

Return value

None.

Exceptions

  • If mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
  • If drawCount or items in countsList, offsetsList, or instanceCountsList are negative, a gl.INVALID_VALUE error is thrown.

Examples

js
const counts = new Int32Array(/* … */);
const offsets = new Int32Array(/* … */);
const instanceCounts = new Int32Array(/* … */);
ext.multiDrawElementsInstancedWEBGL(
  gl.TRIANGLES,
  counts,
  0,
  gl.UNSIGNED_SHORT,
  offsets,
  0,
  instanceCounts,
  0,
  counts.length,
);

Specifications

Specification
WebGL WEBGL_multi_draw Extension Specification

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
multiDrawElementsInstancedWEBGL

Legend

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Full support
Full support
No support
No support

See also