The WebGLRenderingContext.clearStencil() method of the WebGL API specifies the clear value for the stencil buffer.

This specifies what stencil value to use when calling the clear() method.

s

A GLint specifying the index used when the stencil buffer is cleared. Default value: 0.

None (undefined).

gl.clearStencil(1);

To get the current stencil clear value, query the STENCIL_CLEAR_VALUE constant.

gl.getParameter(gl.STENCIL_CLEAR_VALUE);
// 1

• WebGLRenderingContext.clear()
• WebGLRenderingContext.clearColor()
• WebGLRenderingContext.clearDepth()