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import { CubeReflectionMapping, CubeRefractionMapping, EquirectangularReflectionMapping, EquirectangularRefractionMapping } from '../../constants.js';
import { WebGLCubeRenderTarget } from '../WebGLCubeRenderTarget.js';
function WebGLCubeMaps( renderer ) {
let cubemaps = new WeakMap();
function mapTextureMapping( texture, mapping ) {
if ( mapping === EquirectangularReflectionMapping ) {
texture.mapping = CubeReflectionMapping;
} else if ( mapping === EquirectangularRefractionMapping ) {
texture.mapping = CubeRefractionMapping;
}
return texture;
}
function get( texture ) {
if ( texture && texture.isTexture ) {
const mapping = texture.mapping;
if ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping ) {
if ( cubemaps.has( texture ) ) {
const cubemap = cubemaps.get( texture ).texture;
return mapTextureMapping( cubemap, texture.mapping );
} else {
const image = texture.image;
if ( image && image.height > 0 ) {
const renderTarget = new WebGLCubeRenderTarget( image.height );
renderTarget.fromEquirectangularTexture( renderer, texture );
cubemaps.set( texture, renderTarget );
texture.addEventListener( 'dispose', onTextureDispose );
return mapTextureMapping( renderTarget.texture, texture.mapping );
} else {
// image not yet ready. try the conversion next frame
return null;
}
}
}
}
return texture;
}
function onTextureDispose( event ) {
const texture = event.target;
texture.removeEventListener( 'dispose', onTextureDispose );
const cubemap = cubemaps.get( texture );
if ( cubemap !== undefined ) {
cubemaps.delete( texture );
cubemap.dispose();
}
}
function dispose() {
cubemaps = new WeakMap();
}
return {
get: get,
dispose: dispose
};
}
export { WebGLCubeMaps };