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.

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.

None (undefined).

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

• WebGLRenderingContext.colorMask()
• WebGLRenderingContext.depthMask()
• WebGLRenderingContext.stencilMask()