setBlending method
dynamic
setBlending(])
Implementation
setBlending(
int blending,
[int? blendEquation,
int? blendSrc,
int? blendDst,
int? blendEquationAlpha,
int? blendSrcAlpha,
int? blendDstAlpha,
bool? premultipliedAlpha]) {
if (blending == NoBlending) {
if (currentBlendingEnabled) {
disable(gl.BLEND);
currentBlendingEnabled = false;
}
return;
}
if (!currentBlendingEnabled) {
enable(gl.BLEND);
currentBlendingEnabled = true;
}
if (blending != CustomBlending) {
if (blending != currentBlending ||
premultipliedAlpha != currentPremultipledAlpha) {
if (currentBlendEquation != AddEquation ||
currentBlendEquationAlpha != AddEquation) {
gl.blendEquation(gl.FUNC_ADD);
currentBlendEquation = AddEquation;
currentBlendEquationAlpha = AddEquation;
}
if (premultipliedAlpha != null && premultipliedAlpha) {
switch (blending) {
case NormalBlending:
gl.blendFuncSeparate(gl.ONE, gl.ONE_MINUS_SRC_ALPHA, gl.ONE,
gl.ONE_MINUS_SRC_ALPHA);
break;
case AdditiveBlending:
gl.blendFunc(gl.ONE, gl.ONE);
break;
case SubtractiveBlending:
gl.blendFuncSeparate(
gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE);
break;
case MultiplyBlending:
gl.blendFuncSeparate(
gl.ZERO, gl.SRC_COLOR, gl.ZERO, gl.SRC_ALPHA);
break;
default:
print('THREE.WebGLState: Invalid blending: $blending');
break;
}
} else {
switch (blending) {
case NormalBlending:
gl.blendFuncSeparate(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE,
gl.ONE_MINUS_SRC_ALPHA);
break;
case AdditiveBlending:
gl.blendFunc(gl.SRC_ALPHA, gl.ONE);
break;
case SubtractiveBlending:
gl.blendFuncSeparate(
gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE);
break;
case MultiplyBlending:
gl.blendFunc(gl.ZERO, gl.SRC_COLOR);
break;
default:
print('THREE.WebGLState: Invalid blending: $blending');
break;
}
}
currentBlendSrc = null;
currentBlendDst = null;
currentBlendSrcAlpha = null;
currentBlendDstAlpha = null;
currentBlending = blending;
currentPremultipledAlpha = premultipliedAlpha;
}
return;
}
// custom blending
blendEquationAlpha = blendEquationAlpha ?? blendEquation;
blendSrcAlpha = blendSrcAlpha ?? blendSrc;
blendDstAlpha = blendDstAlpha ?? blendDst;
if (blendEquation != currentBlendEquation ||
blendEquationAlpha != currentBlendEquationAlpha) {
gl.blendEquationSeparate(
equationToGL[blendEquation]!, equationToGL[blendEquationAlpha]!);
currentBlendEquation = blendEquation;
currentBlendEquationAlpha = blendEquationAlpha;
}
if (blendSrc != currentBlendSrc ||
blendDst != currentBlendDst ||
blendSrcAlpha != currentBlendSrcAlpha ||
blendDstAlpha != currentBlendDstAlpha) {
gl.blendFuncSeparate(factorToGL[blendSrc], factorToGL[blendDst],
factorToGL[blendSrcAlpha], factorToGL[blendDstAlpha]);
currentBlendSrc = blendSrc;
currentBlendDst = blendDst;
currentBlendSrcAlpha = blendSrcAlpha;
currentBlendDstAlpha = blendDstAlpha;
}
currentBlending = blending;
currentPremultipledAlpha = null;
}