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import { CubeReflectionMapping, CubeRefractionMapping, EquirectangularReflectionMapping, EquirectangularRefractionMapping } from '../../constants.js';
import { PMREMGenerator } from '../../extras/PMREMGenerator.js';
function WebGLCubeUVMaps( renderer ) {
let cubeUVmaps = new WeakMap();
let pmremGenerator = null;
function get( texture ) {
if ( texture && texture.isTexture ) {
const mapping = texture.mapping;
const isEquirectMap = ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping );
const isCubeMap = ( mapping === CubeReflectionMapping || mapping === CubeRefractionMapping );
// equirect/cube map to cubeUV conversion
if ( isEquirectMap || isCubeMap ) {
if ( texture.isRenderTargetTexture && texture.needsPMREMUpdate === true ) {
texture.needsPMREMUpdate = false;
let renderTarget = cubeUVmaps.get( texture );
if ( pmremGenerator === null ) pmremGenerator = new PMREMGenerator( renderer );
renderTarget = isEquirectMap ? pmremGenerator.fromEquirectangular( texture, renderTarget ) : pmremGenerator.fromCubemap( texture, renderTarget );
cubeUVmaps.set( texture, renderTarget );
return renderTarget.texture;
} else {
if ( cubeUVmaps.has( texture ) ) {
return cubeUVmaps.get( texture ).texture;
} else {
const image = texture.image;
if ( ( isEquirectMap && image && image.height > 0 ) || ( isCubeMap && image && isCubeTextureComplete( image ) ) ) {
if ( pmremGenerator === null ) pmremGenerator = new PMREMGenerator( renderer );
const renderTarget = isEquirectMap ? pmremGenerator.fromEquirectangular( texture ) : pmremGenerator.fromCubemap( texture );
cubeUVmaps.set( texture, renderTarget );
texture.addEventListener( 'dispose', onTextureDispose );
return renderTarget.texture;
} else {
// image not yet ready. try the conversion next frame
return null;
}
}
}
}
}
return texture;
}
function isCubeTextureComplete( image ) {
let count = 0;
const length = 6;
for ( let i = 0; i < length; i ++ ) {
if ( image[ i ] !== undefined ) count ++;
}
return count === length;
}
function onTextureDispose( event ) {
const texture = event.target;
texture.removeEventListener( 'dispose', onTextureDispose );
const cubemapUV = cubeUVmaps.get( texture );
if ( cubemapUV !== undefined ) {
cubeUVmaps.delete( texture );
cubemapUV.dispose();
}
}
function dispose() {
cubeUVmaps = new WeakMap();
if ( pmremGenerator !== null ) {
pmremGenerator.dispose();
pmremGenerator = null;
}
}
return {
get: get,
dispose: dispose
};
}
export { WebGLCubeUVMaps };