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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 | 1x 205x 205x 5787x 3969x 1818x 5589x 5589x 5589x 205x 205x 5787x 205x 5589x 205x 242240x 242240x 242240x 158926x 242240x 242240x 11376x 230864x | // This is used to access the underlying 3D context
export const GET_UNDERLYING_CONTEXT = '__getUnderlyingContext';
export function createContextProxyHandler() {
const cache = new Map();
const getParameterHandler = {
apply(target, gl, args) {
if (cache.has(args[0])) {
return cache.get(args[0]);
}
return target.apply(gl, args);
},
};
// only supports single-value setters
function cachedSetterHandler(key) {
return {
apply(target, gl, args) {
cache.set(key, args[0]);
return target.apply(gl, args);
},
};
}
// When a property is accessed on the webgl context proxy,
// it's accessed is intercepted. If the property name matches
// any of the keys of `propHandlers`, then that handler is called
// with the following arguments: (gl, prop, receiver, propValue)
// - gl (WebGL2RenderingContext): the underlying webgl context
// - propName (string): the property name
// - receiver (Proxy): the webgl context proxy
// - propValue (unknown): the value of `gl[propName]`
const propHandlers = Object.create(null);
// Sets getParameter(property) as a cached getter proxy.
// propValue.bind(gl) is to avoid Illegal Invocation errors.
propHandlers.getParameter = (gl, prop, receiver, propValue) =>
new Proxy(propValue.bind(gl), getParameterHandler);
// Sets depthMask(flag) as a cached setter proxy.
propHandlers.depthMask = (gl, prop, receiver, propValue) =>
new Proxy(propValue.bind(gl), cachedSetterHandler(gl.DEPTH_WRITEMASK));
return {
get(gl, prop, receiver) {
Iif (prop === GET_UNDERLYING_CONTEXT) return () => gl;
let value = Reflect.get(gl, prop, gl);
if (value instanceof Function) {
// prevents Illegal Invocation errors
value = value.bind(gl);
}
const propHandler = propHandlers[prop];
if (propHandler) {
return propHandler(gl, prop, receiver, value);
}
return value;
},
};
}
export default { createContextProxyHandler };
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