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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/clear below:

WebGLRenderingContext: clear() method - Web APIs

mask

A GLbitfield bitwise OR mask that indicates the buffers to be cleared. Possible values are:

• gl.COLOR_BUFFER_BIT
• gl.DEPTH_BUFFER_BIT
• gl.STENCIL_BUFFER_BIT

None (undefined).

If mask is not one of the listed possible values, a gl.INVALID_ENUM error is thrown.

The clear() method accepts multiple values.

gl.clear(gl.DEPTH_BUFFER_BIT);
gl.clear(gl.DEPTH_BUFFER_BIT | gl.COLOR_BUFFER_BIT);

To get the current clear values, query the COLOR_CLEAR_VALUE, DEPTH_CLEAR_VALUE, and STENCIL_CLEAR_VALUE constants.

gl.getParameter(gl.COLOR_CLEAR_VALUE);
gl.getParameter(gl.DEPTH_CLEAR_VALUE);
gl.getParameter(gl.STENCIL_CLEAR_VALUE);

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• WebGLRenderingContext.clearColor()
• WebGLRenderingContext.clearDepth()
• WebGLRenderingContext.clearStencil()

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