The WebGLRenderingContext.drawElements()
method of the WebGL API renders primitives from array data.
The WebGLRenderingContext.drawElements()
method of the WebGL API renders primitives from array data.
js
drawElements(mode, count, type, offset)
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.count
A GLsizei
specifying the number of elements of the bound element array buffer to be rendered. For example, to draw a wireframe triangle with gl.LINES
the count should be 2 endpoints per line × 3 lines = 6 elements. However to draw the same wireframe triangle with gl.LINE_STRIP
the element array buffer does not repeat the indices for the end of the first line/start of the second line, and end of the second line/start of the third line, so count
will be four. To draw the same triangle with gl.LINE_LOOP
the element array buffer does not repeat the first/last vertex either so count
will be three.
type
A GLenum
specifying the type of the values in the element array buffer. Possible values are:
gl.UNSIGNED_BYTE
gl.UNSIGNED_SHORT
When using the OES_element_index_uint
extension:
gl.UNSIGNED_INT
offset
A GLintptr
specifying a byte offset in the element array buffer. Must be a valid multiple of the size of the given type
.
None (undefined
).
mode
is not one of the accepted values, a gl.INVALID_ENUM
error is thrown. offset
is not a valid multiple of the size of the given type, a gl.INVALID_OPERATION
error is thrown. count
is negative, a gl.INVALID_VALUE
error is thrown.js
gl.drawElements(gl.POINTS, 8, gl.UNSIGNED_BYTE, 0);
Specification |
---|
WebGL Specification # 5.14.11 |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
drawElements |
9 | 12 | 4 | 11 | 12 | 5.1 | 4.4.3 | 25 | 4 | 12 | 8 | 1.5 |
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https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/drawElements