The WebGLRenderingContext.depthFunc() method of the WebGL API specifies a function that compares incoming pixel depth to the current depth buffer value.

func

A GLenum specifying the depth comparison function, which sets the conditions under which the pixel will be drawn. The default value is gl.LESS. Possible values are:

• gl.NEVER (never pass)
• gl.LESS (pass if the incoming value is less than the depth buffer value)
• gl.EQUAL (pass if the incoming value equals the depth buffer value)
• gl.LEQUAL (pass if the incoming value is less than or equal to the depth buffer value)
• gl.GREATER (pass if the incoming value is greater than the depth buffer value)
• gl.NOTEQUAL (pass if the incoming value is not equal to the depth buffer value)
• gl.GEQUAL (pass if the incoming value is greater than or equal to the depth buffer value)
• gl.ALWAYS (always pass)

None (undefined).

The depth testing is disabled by default. To enable or disable depth testing, use the enable() and disable() methods with the argument gl.DEPTH_TEST.

gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.NEVER);

To check the current depth function, query the DEPTH_FUNC constant.

gl.getParameter(gl.DEPTH_FUNC) === gl.NEVER;
// true

• WebGLRenderingContext.enable()