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WebGLRenderingContext.scissor

The WebGLRenderingContext.scissor() method of the WebGL API sets a scissor box, which limits the drawing to a specified rectangle.

Syntax

void gl.scissor(x, y, width, height);

Parameters

x
A GLint specifying the horizontal coordinate for the lower left corner of the box. Default value: 0.
y
A GLint specifying the vertical coordinate for the lower left corner of the box. Default value: 0.
width
A non-negative Glsizei specifying the width of the scissor box. Default value: width of the canvas.
height
A non-negative Glsizei specifying the height of the scissor box. Default value: height of the canvas.

Return value

None.

Exceptions

If either width or height is a negative value, a gl.INVALID_VALUE error is thrown.

Examples

When the scissor test is enabled, only pixels within the scissor box can be modified by drawing commands.

// turn on scissor test
gl.enable(gl.SCISSOR_TEST);

// set the scissor rectangle
gl.scissor(x, y, width, height);

// execute drawing commands in the scissor box (e.g. clear)

// turn off scissor test again
gl.disable(gl.SCISSOR_TEST);

To get the current scissor box dimensions, query the SCISSOR_BOX constant which returns an Int32Array.

gl.scissor(0, 0, 200, 200);
gl.getParameter(gl.SCISSOR_BOX);
// Int32Array[0, 0, 200, 200]

Specifications

Specification Status Comment
WebGL 1.0
The definition of 'scissor' in that specification.
Recommendation Initial definition.
OpenGL ES 2.0
The definition of 'glScissor' in that specification.
Standard Man page of the OpenGL API.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 9 12 4 11 12 5.1
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support Yes 25 Yes Yes 12 8.1 Yes

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/scissor