gpu-curtains/dist/esm/core/shaders/chunks/fragment/body/get-specular.mjs

gpu-curtains is a 3D WebGPU rendering engine. It can be used as a standalone 3D engine, but also includes extra classes focused on mapping 3d objects to DOM elements; It allows users to synchronize values such as position, sizing, or scale between them.

const getSpecular = ({
  specularTexture = null,
  specularFactorTexture = null,
  specularColorTexture = null
} = {}) => {
  let specular = "";
  if (specularTexture) {
    specular += /* wgsl */
    `
  var specularUV: vec2f = ${specularTexture.texCoordAttributeName ?? "uv"};`;
    if ("useTransform" in specularTexture.texture.options && specularTexture.texture.options.useTransform) {
      specular += /* wgsl */
      `
  specularUV = (${specularTexture.texture.options.name}Matrix * vec3(specularUV, 1.0)).xy;`;
    }
    specular += /* wgsl */
    `
  let specularSample: vec4f = textureSample(${specularTexture.texture.options.name}, ${specularTexture.sampler?.name ?? "defaultSampler"}, specularUV);
  
  specularIntensity = specularIntensity * specularSample.a;
  specularColor = specularColor * specularSample.rgb;`;
  } else {
    if (specularFactorTexture) {
      specular += /* wgsl */
      `
  var specularFactorUV: vec2f = ${specularFactorTexture.texCoordAttributeName ?? "uv"};`;
      if ("useTransform" in specularFactorTexture.texture.options && specularFactorTexture.texture.options.useTransform) {
        specular += /* wgsl */
        `
  specularFactorUV = (${specularFactorTexture.texture.options.name}Matrix * vec3(specularFactorUV, 1.0)).xy;`;
      }
      specular += /* wgsl */
      `
  let specularFactorSample: vec4f = textureSample(${specularFactorTexture.texture.options.name}, ${specularFactorTexture.sampler?.name ?? "defaultSampler"}, specularFactorUV);
  
  specularIntensity = specularIntensity * specularSample.a;`;
    }
    if (specularColorTexture) {
      specular += /* wgsl */
      `
  var specularColorUV: vec2f = ${specularColorTexture.texCoordAttributeName ?? "uv"};`;
      if ("useTransform" in specularColorTexture.texture.options && specularColorTexture.texture.options.useTransform) {
        specular += /* wgsl */
        `
  specularColorUV = (${specularColorTexture.texture.options.name}Matrix * vec3(specularColorUV, 1.0)).xy;`;
      }
      specular += /* wgsl */
      `
  let specularColorSample: vec4f = textureSample(${specularColorTexture.texture.options.name}, ${specularColorTexture.sampler?.name ?? "defaultSampler"}, specularColorUV);
  
  specularColor = specularColor * specularSample.rgb;`;
    }
  }
  return specular;
};

export { getSpecular };