WebGLRenderingContext.clearColor() - Web APIs 编辑

The WebGLRenderingContext.clearColor() method of the WebGL API specifies the color values used when clearing color buffers.

This specifies what color values to use when calling the clear() method. The values are clamped between 0 and 1.

Syntax

void gl.clearColor(red, green, blue, alpha);

red: A GLclampf specifying the red color value used when the color buffers are cleared. Default value: 0.
green: A GLclampf specifying the green color value used when the color buffers are cleared. Default value: 0.
blue: A GLclampf specifying the blue color value used when the color buffers are cleared. Default value: 0.
alpha: A GLclampf specifying the alpha (transparency) value used when the color buffers are cleared. Default value: 0.

None.

gl.clearColor(1, 0.5, 0.5, 3);

To get the current clear color, query the COLOR_CLEAR_VALUE constant which returns a Float32Array.

gl.getParameter(gl.COLOR_CLEAR_VALUE);
// Float32Array[1, 0.5, 0.5, 1]

Specification	Status	Comment
WebGL 1.0 The definition of 'clearColor' in that specification.	Recommendation	Initial definition.
OpenGL ES 2.0 The definition of 'glClearColor' in that specification.	Standard	Man page of the OpenGL API.

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