The WEBGL_multi_draw.multiDrawElementsWEBGL()
method of the WebGL API renders multiple primitives from array data. It is identical to multiple calls to the gl.drawElementsInstanced()
method.
The WEBGL_multi_draw.multiDrawElementsWEBGL()
method of the WebGL API renders multiple primitives from array data. It is identical to multiple calls to the gl.drawElementsInstanced()
method.
js
multiDrawElementsInstancedWEBGL(mode, countsList, countsOffset, type, firstsList, firstsOffset, instanceCountsList, instanceCountsOffset, drawCount);
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.
A GLenum
specifying the type of the values in the element array buffer. Possible values are:
gl.UNSIGNED_BYTE
gl.UNSIGNED_SHORT
OES_element_index_uint
extension: gl.UNSIGNED_INT
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.
None.
mode
is not one of the accepted values, a gl.INVALID_ENUM
error is thrown. drawCount
or items in countsList
, offsetsList
, or instanceCountsList
are negative, a gl.INVALID_VALUE
error is thrown. 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, );
Specification |
---|
WebGL WEBGL_multi_draw Extension Specification |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
multiDrawElementsInstancedWEBGL |
86 | 86 | No | No | 72 | 15 | 86 | 86 | No | No | 15 | 14.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_multi_draw/multiDrawElementsInstancedWEBGL