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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | 1x | import BlendEquation from "./BlendEquation.js";
import BlendFunction from "./BlendFunction.js";
/**
* The blending state combines {@link BlendEquation} and {@link BlendFunction} and the
* <code>enabled</code> flag to define the full blending state for combining source and
* destination fragments when rendering.
* <p>
* This is a helper when using custom render states with {@link Appearance#renderState}.
* </p>
*
* @namespace
*/
const BlendingState = {
/**
* Blending is disabled.
*
* @type {object}
* @constant
*/
DISABLED: Object.freeze({
enabled: false,
}),
/**
* Blending is enabled using alpha blending, <code>source(source.alpha) + destination(1 - source.alpha)</code>.
*
* @type {object}
* @constant
*/
ALPHA_BLEND: Object.freeze({
enabled: true,
equationRgb: BlendEquation.ADD,
equationAlpha: BlendEquation.ADD,
functionSourceRgb: BlendFunction.SOURCE_ALPHA,
functionSourceAlpha: BlendFunction.ONE,
functionDestinationRgb: BlendFunction.ONE_MINUS_SOURCE_ALPHA,
functionDestinationAlpha: BlendFunction.ONE_MINUS_SOURCE_ALPHA,
}),
/**
* Blending is enabled using alpha blending with premultiplied alpha, <code>source + destination(1 - source.alpha)</code>.
*
* @type {object}
* @constant
*/
PRE_MULTIPLIED_ALPHA_BLEND: Object.freeze({
enabled: true,
equationRgb: BlendEquation.ADD,
equationAlpha: BlendEquation.ADD,
functionSourceRgb: BlendFunction.ONE,
functionSourceAlpha: BlendFunction.ONE,
functionDestinationRgb: BlendFunction.ONE_MINUS_SOURCE_ALPHA,
functionDestinationAlpha: BlendFunction.ONE_MINUS_SOURCE_ALPHA,
}),
/**
* Blending is enabled using additive blending, <code>source(source.alpha) + destination</code>.
*
* @type {object}
* @constant
*/
ADDITIVE_BLEND: Object.freeze({
enabled: true,
equationRgb: BlendEquation.ADD,
equationAlpha: BlendEquation.ADD,
functionSourceRgb: BlendFunction.SOURCE_ALPHA,
functionSourceAlpha: BlendFunction.ONE,
functionDestinationRgb: BlendFunction.ONE,
functionDestinationAlpha: BlendFunction.ONE,
}),
};
export default Object.freeze(BlendingState);
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