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WebGLRenderingContext.stencilMaskSeparate

The WebGLRenderingContext.stencilMaskSeparate() method of the WebGL API controls enabling and disabling of front and/or back writing of individual bits in the stencil planes.

The WebGLRenderingContext.stencilMask() method can set both, the front and back stencil writemasks to one value at the same time.

Syntax

void gl.stencilMaskSeparate(face, mask);

Parameters

face

A GLenum specifying whether the front and/or back stencil writemask is updated. The possible values are:

gl.FRONT
gl.BACK
gl.FRONT_AND_BACK

mask

A GLuint specifying a bit mask to enable or disable writing of individual bits in the stencil planes. By default, the mask is all 1.

Return value

None.

Examples

gl.stencilMaskSeparate(gl.FRONT, 110101);

To get the current stencil masks, query the STENCIL_WRITEMASK, STENCIL_BACK_WRITEMASK, or STENCIL_BITS constants.

gl.getParameter(gl.STENCIL_WRITEMASK);
// 110101
gl.getParameter(gl.STENCIL_BACK_WRITEMASK);
// 110101
gl.getParameter(gl.STENCIL_BITS);
// 0

Specifications

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

Browser compatibility

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	9	12	4	11	12	5.1

Feature	Android webview	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic support	Yes	25	Yes	Yes	11	12	8.1