Add existing to tracked

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

@@ -0,0 +1,121 @@
+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 FramebufferManager from "../Renderer/FramebufferManager.js";
+import PassState from "../Renderer/PassState.js";
+import PixelDatatype from "../Renderer/PixelDatatype.js";
+
+/**
+ * @private
+ */
+function SnapFramebuffer(context) {
+  const passState = new PassState(context);
+  passState.blendingEnabled = false;
+  passState.scissorTest = {
+    enabled: true,
+    rectangle: new BoundingRectangle(),
+  };
+  passState.viewport = new BoundingRectangle();
+
+  this._context = context;
+  this._fb = new FramebufferManager({
+    depthStencil: true,
+    pixelDatatype: PixelDatatype.FLOAT,
+    pixelFormat: PixelFormat.RGBA,
+  });
+  this._passState = passState;
+}
+
+function getSnapObjectsFromPixels(context, pixels, width, height) {
+  const max = Math.max(width, height);
+  const length = max * max;
+  const halfWidth = Math.floor(width * 0.5);
+  const halfHeight = Math.floor(height * 0.5);
+
+  let x = 0;
+  let y = 0;
+  let dx = 0;
+  let dy = -1;
+
+  const results = [];
+  for (let i = 0; i < length; ++i) {
+    if (
+      -halfWidth <= x &&
+      x <= halfWidth &&
+      -halfHeight <= y &&
+      y <= halfHeight
+    ) {
+      const index = 4 * ((halfHeight - y) * width + x + halfWidth);
+
+      const pickColor = pixels[index];
+      const object = context.getObjectByPickColor(pickColor);
+      if (defined(object)) {
+        results.push({
+          object: object,
+          isEdge: pixels[index + 1] > 0.0,
+          depth: pixels[index + 2],
+          x: x,
+          y: y,
+        });
+      }
+    }
+
+    if (x === y || (x < 0 && -x === y) || (x > 0 && x === 1 - y)) {
+      const temp = dx;
+      dx = -dy;
+      dy = temp;
+    }
+
+    x += dx;
+    y += dy;
+  }
+
+  return results;
+}
+
+SnapFramebuffer.prototype.begin = function (screenSpaceRectangle, viewport) {
+  const context = this._context;
+  const { width, height } = viewport;
+
+  BoundingRectangle.clone(
+    screenSpaceRectangle,
+    this._passState.scissorTest.rectangle,
+  );
+
+  this._fb.update(context, width, height);
+  this._passState.framebuffer = this._fb.framebuffer;
+
+  this._passState.viewport.width = width;
+  this._passState.viewport.height = height;
+
+  return this._passState;
+};
+
+SnapFramebuffer.prototype.end = function (screenSpaceRectangle) {
+  const width = screenSpaceRectangle.width ?? 1.0;
+  const height = screenSpaceRectangle.height ?? 1.0;
+
+  const context = this._context;
+  const pixels = context.readPixels({
+    x: screenSpaceRectangle.x,
+    y: screenSpaceRectangle.y,
+    width: width,
+    height: height,
+    pixelDatatype: PixelDatatype.FLOAT,
+    framebuffer: this._fb.framebuffer,
+  });
+
+  return getSnapObjectsFromPixels(context, pixels, width, height);
+};
+
+SnapFramebuffer.prototype.isDestroyed = function () {
+  return false;
+};
+
+SnapFramebuffer.prototype.destroy = function () {
+  this._fb.destroy();
+  return destroyObject(this);
+};
+
+export default SnapFramebuffer;