import { SEMANTIC_POSITION } from '../../constants.js';

import { shaderChunks } from '../chunks/chunks.js';

import { gammaCode, precisionCode, tonemapCode } from './common.js';

const skybox = {

generateKey: function (options) {

const key = "skybox" + options.rgbm + " " + options.hdr + " " + options.fixSeams + "" +

options.toneMapping + "" + options.gamma + "" + options.useIntensity + "" +

options.useCubeMapRotation + "" + options.useRightHandedCubeMap + "" + options.mip;

return key;

},

createShaderDefinition: function (device, options) {

const mip2size = [128, 64, 32, 16, 8, 4, 2];

let fshader = precisionCode(device);

fshader += options.useCubeMapRotation ? '#define CUBEMAP_ROTATION\n' : '';

fshader += options.useRightHandedCubeMap ? '#define RIGHT_HANDED_CUBEMAP\n' : '';

fshader += options.mip ? shaderChunks.fixCubemapSeamsStretchPS : shaderChunks.fixCubemapSeamsNonePS;

fshader += options.useIntensity ? shaderChunks.envMultiplyPS : shaderChunks.envConstPS;

fshader += gammaCode(options.gamma);

fshader += tonemapCode(options.toneMapping);

fshader += shaderChunks.rgbmPS;

fshader += shaderChunks.skyboxHDRPS

.replace(/\$textureCubeSAMPLE/g, options.rgbm ? "textureCubeRGBM" : (options.hdr ? "textureCube" : "textureCubeSRGB"))

.replace(/\$FIXCONST/g, (1 - 1 / mip2size[options.mip]) + "");

return {

attributes: {

aPosition: SEMANTIC_POSITION

},

vshader: shaderChunks.skyboxVS,

fshader: fshader

};

}

};

export { skybox };