Baseline Widely available
Note: This feature is available in Web Workers.
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
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