Allow changing the HDR tonemap

Apps/Sandcastle/gallery/High Dynamic Range.html

@@ -24,42 +24,120 @@
   >
     <style>
       @import url(../templates/bucket.css);
+
+      #toolbar {
+        background: rgba(42, 42, 42, 0.8);
+        padding: 4px;
+        border-radius: 4px;
+      }
+
+      #toolbar input {
+        vertical-align: middle;
+        padding-top: 2px;
+        padding-bottom: 2px;
+      }
     </style>
     <div id="cesiumContainer" class="fullSize"></div>
     <div id="loadingOverlay"><h1>Loading...</h1></div>
-    <div id="toolbar"></div>
+    <div id="toolbar">
+      <div id="hdr-toggle"></div>
+      <span>Tonemap</span>
+      <span id="tonemap-select"></span>
+      <br />
+      <span>Exposure</span>
+      <input
+        type="range"
+        min="0.1"
+        max="10.0"
+        step="0.1"
+        data-bind="value: exposure, valueUpdate: 'input'"
+      />
+      <input type="text" size="5" data-bind="value: exposure" />
+    </div>
     <script id="cesium_sandcastle_script">
       window.startup = async function (Cesium) {
         "use strict";
         //Sandcastle_Begin
         const viewer = new Cesium.Viewer("cesiumContainer", {
           terrain: Cesium.Terrain.fromWorldTerrain(),
           shadows: true,
+          timeline: false,
+          animation: false,
+          geocoder: false,
+          sceneModePicker: false,
+          baseLayerPicker: false,
         });
 
         if (!viewer.scene.highDynamicRangeSupported) {
           window.alert("This browser does not support high dynamic range.");
         }
 
-        viewer.scene.camera.setView({
-          destination: new Cesium.Cartesian3(
-            -1915097.7863741855,
-            -4783356.851539908,
-            3748887.43462683
-          ),
-          orientation: new Cesium.HeadingPitchRoll(
-            6.166004548388564,
-            -0.043242401760068994,
-            0.002179961955988574
-          ),
-          endTransform: Cesium.Matrix4.IDENTITY,
-        });
-
         viewer.scene.highDynamicRange = true;
 
-        Sandcastle.addToggleButton("HDR", true, function (checked) {
-          viewer.scene.highDynamicRange = checked;
-        });
+        Sandcastle.addToggleButton(
+          "HDR",
+          true,
+          function (checked) {
+            viewer.scene.highDynamicRange = checked;
+          },
+          "hdr-toggle"
+        );
+
+        const toneMapOptions = [
+          {
+            text: "PBR Neutral",
+            onselect: function () {
+              viewer.scene.postProcessStages.tonemapper =
+                Cesium.Tonemapper.PBR_NEUTRAL;
+            },
+          },
+          {
+            text: "Aces",
+            onselect: function () {
+              viewer.scene.postProcessStages.tonemapper =
+                Cesium.Tonemapper.ACES;
+            },
+          },
+          {
+            text: "Reinhard",
+            onselect: function () {
+              viewer.scene.postProcessStages.tonemapper =
+                Cesium.Tonemapper.REINHARD;
+            },
+          },
+          {
+            text: "Modified_Reinhard",
+            onselect: function () {
+              viewer.scene.postProcessStages.tonemapper =
+                Cesium.Tonemapper.MODIFIED_REINHARD;
+            },
+          },
+          {
+            text: "Filmic",
+            onselect: function () {
+              viewer.scene.postProcessStages.tonemapper =
+                Cesium.Tonemapper.FILMIC;
+            },
+          },
+        ];
+        Sandcastle.addDefaultToolbarMenu(toneMapOptions, "tonemap-select");
+
+        const viewModel = {
+          exposure: 1,
+        };
+        // Convert the viewModel members into knockout observables.
+        Cesium.knockout.track(viewModel);
+        // Bind the viewModel to the DOM elements of the UI that call for it.
+        const toolbar = document.getElementById("toolbar");
+        Cesium.knockout.applyBindings(viewModel, toolbar);
+
+        Cesium.knockout
+          .getObservable(viewModel, "exposure")
+          .subscribe(function (newValue) {
+            viewer.scene.postProcessStages.exposure = Number.parseFloat(
+              newValue
+            );
+          });
 
         const url =
           "../../SampleData/models/DracoCompressed/CesiumMilkTruck.gltf";
@@ -86,7 +164,46 @@
             uri: url,
             scale: scale,
           },
-        }); //Sandcastle_End
+        });
+
+        // set up canyon view
+        viewer.scene.camera.setView({
+          destination: new Cesium.Cartesian3(
+            -1915097.7863741855,
+            -4783356.851539908,
+            3748887.43462683
+          ),
+          orientation: new Cesium.HeadingPitchRoll(
+            6.166004548388564,
+            -0.043242401760068994,
+            0.002179961955988574
+          ),
+          endTransform: Cesium.Matrix4.IDENTITY,
+        });
+        // set time so the sun is overhead
+        viewer.clock.currentTime = new Cesium.JulianDate(2460550, 21637);
+
+        viewer.scene.debugShowFramesPerSecond = true;
+        // override the default home location to return to the start
+        viewer.homeButton.viewModel.command.beforeExecute.addEventListener(
+          (e) => {
+            e.cancel = true;
+            viewer.scene.camera.setView({
+              destination: new Cesium.Cartesian3(
+                -1915097.7863741855,
+                -4783356.851539908,
+                3748887.43462683
+              ),
+              orientation: new Cesium.HeadingPitchRoll(
+                6.166004548388564,
+                -0.043242401760068994,
+                0.002179961955988574
+              ),
+              endTransform: Cesium.Matrix4.IDENTITY,
+            });
+          }
+        );
+        //Sandcastle_End
       };
       if (typeof Cesium !== "undefined") {
         window.startupCalled = true;

CHANGES.md

@@ -9,6 +9,8 @@
 - Enable MSAA by default with 4 samples. To turn MSAA off set `scene.msaaSamples = 1` [#12158](https://github.com/CesiumGS/cesium/pull/12158)
 - Made the `time` parameter optional for `Property`, using `JulianDate.now()` as default. [#12099](https://github.com/CesiumGS/cesium/pull/12099)
 - Exposes `ScreenSpaceCameraController.zoomFactor` to allow adjusting the zoom factor (speed). [#9145](https://github.com/CesiumGS/cesium/pull/9145)
+- Expose the `tonemapper` property of `PostProcessStageCollection` to allow changing the tonemap used when HDR is turned on. This defaults to the [PBR Neutral Tonemap from Khronos](https://github.com/KhronosGroup/ToneMapping/tree/main/PBR_Neutral) [#12160](https://github.com/CesiumGS/cesium/pull/12160)
+  - As part of this change we switched the default tonemap for models, atmosphere and globe when _not_ using HDR to the new PBR Neutral tonemap from the ACES tonemap to improve visuals.
 - Added `WaterMask` globe material, which visualizes areas of water or land based on the terrain's water mask. [#12149](https://github.com/CesiumGS/cesium/pull/12149)
 
 ##### Fixes :wrench:

packages/engine/Source/Renderer/ShaderProgram.js

@@ -556,6 +556,13 @@ ShaderProgram.prototype._setUniforms = function (
     len = manualUniforms.length;
     for (i = 0; i < len; ++i) {
       const mu = manualUniforms[i];
+
+      //>>includeStart('debug', pragmas.debug);
+      if (!defined(uniformMap[mu.name])) {
+        throw new DeveloperError(`Unknown uniform: ${mu.name}`);
+      }
+      //>>includeEnd('debug');
+
       mu.value = uniformMap[mu.name]();
     }
   }

packages/engine/Source/Scene/PostProcessStageCollection.js

@@ -12,7 +12,7 @@ import TextureWrap from "../Renderer/TextureWrap.js";
 import PassThrough from "../Shaders/PostProcessStages/PassThrough.js";
 import PostProcessStageLibrary from "./PostProcessStageLibrary.js";
 import PostProcessStageTextureCache from "./PostProcessStageTextureCache.js";
-import Tonemapper from "./Tonemapper.js";
+import Tonemapper, { validateTonemapper } from "./Tonemapper.js";
 
 const stackScratch = [];
 
@@ -41,11 +41,12 @@ function PostProcessStageCollection() {
   // Some shaders, such as the atmosphere and ground atmosphere, output values slightly over 1.0.
   this._autoExposureEnabled = false;
   this._autoExposure = PostProcessStageLibrary.createAutoExposureStage();
+  this._exposure = 1.0;
   this._tonemapping = undefined;
   this._tonemapper = undefined;
 
-  // set tonemapper and tonemapping
-  this.tonemapper = Tonemapper.ACES;
+  // set tonemapper and tonemapping using the setter
+  this.tonemapper = Tonemapper.PBR_NEUTRAL;
 
   const tonemapping = this._tonemapping;
 
@@ -313,11 +314,14 @@ Object.defineProperties(PostProcessStageCollection.prototype, {
   },
 
   /**
-   * Gets and sets the tonemapping algorithm used when rendering with high dynamic range.
+   * Specifies the tonemapping algorithm used when rendering with high dynamic range.
+   * {@link https://sandcastle.cesium.com/?src=High%20Dynamic%20Range.html|Sandcastle Demo}
    *
+   * @example viewer.scene.postProcessStages.tonemapper = Cesium.Tonemapper.PBR_NEUTRAL;
+   *
+   * @default Tonemapper.PBR_NEUTRAL
    * @memberof PostProcessStageCollection.prototype
    * @type {Tonemapper}
-   * @private
    */
   tonemapper: {
     get: function () {
@@ -328,7 +332,7 @@ Object.defineProperties(PostProcessStageCollection.prototype, {
         return;
       }
       //>>includeStart('debug', pragmas.debug);
-      if (!Tonemapper.validate(value)) {
+      if (!validateTonemapper(value)) {
         throw new DeveloperError("tonemapper was set to an invalid value.");
       }
       //>>includeEnd('debug');
@@ -339,49 +343,75 @@ Object.defineProperties(PostProcessStageCollection.prototype, {
       }
 
       const useAutoExposure = this._autoExposureEnabled;
-      let tonemapper;
+      let tonemapping;
 
       switch (value) {
         case Tonemapper.REINHARD:
-          tonemapper = PostProcessStageLibrary.createReinhardTonemappingStage(
+          tonemapping = PostProcessStageLibrary.createReinhardTonemappingStage(
             useAutoExposure
           );
           break;
         case Tonemapper.MODIFIED_REINHARD:
-          tonemapper = PostProcessStageLibrary.createModifiedReinhardTonemappingStage(
+          tonemapping = PostProcessStageLibrary.createModifiedReinhardTonemappingStage(
             useAutoExposure
           );
           break;
         case Tonemapper.FILMIC:
-          tonemapper = PostProcessStageLibrary.createFilmicTonemappingStage(
+          tonemapping = PostProcessStageLibrary.createFilmicTonemappingStage(
+            useAutoExposure
+          );
+          break;
+        case Tonemapper.PBR_NEUTRAL:
+          tonemapping = PostProcessStageLibrary.createPbrNeutralTonemappingStage(
             useAutoExposure
           );
           break;
         default:
-          tonemapper = PostProcessStageLibrary.createAcesTonemappingStage(
+          tonemapping = PostProcessStageLibrary.createAcesTonemappingStage(
             useAutoExposure
           );
           break;
       }
 
       if (useAutoExposure) {
         const autoexposure = this._autoExposure;
-        tonemapper.uniforms.autoExposure = function () {
+        tonemapping.uniforms.autoExposure = function () {
           return autoexposure.outputTexture;
         };
+      } else {
+        tonemapping.uniforms.exposure = this._exposure;
       }
 
       this._tonemapper = value;
-      this._tonemapping = tonemapper;
+      this._tonemapping = tonemapping;
 
       if (defined(this._stageNames)) {
-        this._stageNames[tonemapper.name] = tonemapper;
-        tonemapper._textureCache = this._textureCache;
+        this._stageNames[tonemapping.name] = tonemapping;
+        tonemapping._textureCache = this._textureCache;
       }
 
       this._textureCacheDirty = true;
     },
   },
+
+  /**
+   * Control the exposure when HDR is on. Less than 1.0 makes the tonemapping darker while greater than 1.0 makes it brighter.
+   *
+   * @example viewer.scene.postProcessStages.exposure = 1.0
+   *
+   * @default 1.0
+   * @memberof PostProcessStageCollection.prototype
+   * @type {number}
+   */
+  exposure: {
+    get: function () {
+      return this._exposure;
+    },
+    set: function (value) {
+      this._tonemapping.uniforms.exposure = value;
+      this._exposure = value;
+    },
+  },
 });
 
 function removeStages(collection) {