The WebGLRenderingContext.colorMask() method of the WebGL API sets which color components to enable or to disable when drawing or rendering to a WebGLFramebuffer.

red

A GLboolean specifying whether or not the red color component can be written into the frame buffer. Default value: true.

green

A GLboolean specifying whether or not the green color component can be written into the frame buffer. Default value: true.

blue

A GLboolean specifying whether or not the blue color component can be written into the frame buffer. Default value: true.

alpha

A GLboolean specifying whether or not the alpha (transparency) component can be written into the frame buffer. Default value: true.

None (undefined).

gl.colorMask(true, true, true, false);

To get the current color mask, query the COLOR_WRITEMASK constant which returns an Array.

gl.getParameter(gl.COLOR_WRITEMASK);
// [true, true, true, false]

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