The WebGLRenderingContext.blendEquationSeparate()
method of the WebGL API is used to set the RGB blend equation and alpha blend equation separately.
The blend equation determines how a new pixel is combined with a pixel already in the WebGLFramebuffer
.
blendEquationSeparate(modeRGB, modeAlpha)
If mode is not one of the three possible values, a gl.INVALID_ENUM
error is thrown.
To set the blend equations, use:
gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_SUBTRACT);
To get the current blend equations, query the BLEND_EQUATION
, BLEND_EQUATION_RGB
and BLEND_EQUATION_ALPHA
constants which return gl.FUNC_ADD
, gl.FUNC_SUBTRACT
, gl.FUNC_REVERSE_SUBTRACT
, or if the EXT_blend_minmax
is enabled: ext.MIN_EXT
or ext.MAX_EXT
.
gl.getParameter(gl.BLEND_EQUATION_RGB) === gl.FUNC_ADD;
gl.getParameter(gl.BLEND_EQUATION_ALPHA) === gl.FUNC_ADD;