Add existing to tracked

node_modules/@cesium/engine/Source/Scene/BrdfLutGenerator.js

@@ -0,0 +1,75 @@
+import BoundingRectangle from "../Core/BoundingRectangle.js";
+import defined from "../Core/defined.js";
+import destroyObject from "../Core/destroyObject.js";
+import PixelFormat from "../Core/PixelFormat.js";
+import Framebuffer from "../Renderer/Framebuffer.js";
+import PixelDatatype from "../Renderer/PixelDatatype.js";
+import RenderState from "../Renderer/RenderState.js";
+import Sampler from "../Renderer/Sampler.js";
+import Texture from "../Renderer/Texture.js";
+import BrdfLutGeneratorFS from "../Shaders/BrdfLutGeneratorFS.js";
+
+/**
+ * @private
+ */
+function BrdfLutGenerator() {
+  this._colorTexture = undefined;
+  this._drawCommand = undefined;
+}
+
+Object.defineProperties(BrdfLutGenerator.prototype, {
+  colorTexture: {
+    get: function () {
+      return this._colorTexture;
+    },
+  },
+});
+
+function createCommand(generator, context, framebuffer) {
+  const drawCommand = context.createViewportQuadCommand(BrdfLutGeneratorFS, {
+    framebuffer: framebuffer,
+    renderState: RenderState.fromCache({
+      viewport: new BoundingRectangle(0.0, 0.0, 256.0, 256.0),
+    }),
+  });
+
+  generator._drawCommand = drawCommand;
+}
+
+BrdfLutGenerator.prototype.update = function (frameState) {
+  if (!defined(this._colorTexture)) {
+    const context = frameState.context;
+    const colorTexture = new Texture({
+      context: context,
+      width: 256,
+      height: 256,
+      pixelFormat: PixelFormat.RGBA,
+      pixelDatatype: PixelDatatype.UNSIGNED_BYTE,
+      sampler: Sampler.NEAREST,
+    });
+
+    this._colorTexture = colorTexture;
+    const framebuffer = new Framebuffer({
+      context: context,
+      colorTextures: [colorTexture],
+      destroyAttachments: false,
+    });
+
+    createCommand(this, context, framebuffer);
+    this._drawCommand.execute(context);
+    framebuffer.destroy();
+    this._drawCommand.shaderProgram =
+      this._drawCommand.shaderProgram &&
+      this._drawCommand.shaderProgram.destroy();
+  }
+};
+
+BrdfLutGenerator.prototype.isDestroyed = function () {
+  return false;
+};
+
+BrdfLutGenerator.prototype.destroy = function () {
+  this._colorTexture = this._colorTexture && this._colorTexture.destroy();
+  return destroyObject(this);
+};
+export default BrdfLutGenerator;