Merge pull request #7017 from AnalyticalGraphicsInc/hdr

HDR Rendering

Author: lilleyse

Apps/Sandcastle/gallery/Materials.html

@@ -107,16 +107,20 @@
                     }
                 },
                 source :
-                    'czm_material czm_getMaterial(czm_materialInput materialInput) {' +
-                        'czm_material material = czm_getDefaultMaterial(materialInput);' +
-                        'float heightValue = texture2D(heightField, materialInput.st).r;' +
-                        'material.diffuse = mix(vec3(0.2, 0.6, 0.2), vec3(1.0, 0.5, 0.2), heightValue);' +
-                        'material.alpha = (1.0 - texture2D(image, materialInput.st).r) * 0.7;' +
-                        'material.normal = bumpMap.normal;' +
-                        'material.specular = step(0.1, heightValue);' + // Specular mountain tops
-                        'material.shininess = 8.0;' + // Sharpen highlight
-                        'return material;' +
-                    '}'
+                    'czm_material czm_getMaterial(czm_materialInput materialInput) { \n' +
+                    '    czm_material material = czm_getDefaultMaterial(materialInput); \n' +
+                    '    vec4 color; \n' +
+                    '    float heightValue = texture2D(heightField, materialInput.st).r; \n' +
+                    '    color.rgb = mix(vec3(0.2, 0.6, 0.2), vec3(1.0, 0.5, 0.2), heightValue); \n' +
+                    '    color.a = (1.0 - texture2D(image, materialInput.st).r) * 0.7; \n' +
+                    '    color = czm_gammaCorrect(color); \n' +
+                    '    material.diffuse = color.rgb; \n' +
+                    '    material.alpha = color.a; \n' +
+                    '    material.normal = bumpMap.normal; \n' +
+                    '    material.specular = step(0.1, heightValue); \n' + // Specular mountain tops
+                    '    material.shininess = 8.0; \n' + // Sharpen highlight
+                    '    return material; \n' +
+                    '} \n'
             }
         });
 }

CHANGES.md

@@ -7,6 +7,7 @@ Change Log
 * Added functions to get the most detailed height of 3D Tiles on-screen or off-screen. [#7115](https://github.com/AnalyticalGraphicsInc/cesium/pull/7115)
     * Added `Scene.sampleHeightMostDetailed`, an asynchronous version of `Scene.sampleHeight` that uses the maximum level of detail for 3D Tiles.
     * Added `Scene.clampToHeightMostDetailed`, an asynchronous version of `Scene.clampToHeight` that uses the maximum level of detail for 3D Tiles.
+* Added support for high dynamic range rendering. It is enabled by default when supported, but can be disabled with `Scene.highDynamicRange`. [#7017](https://github.com/AnalyticalGraphicsInc/cesium/pull/7017)
 * Added `Scene.invertClassificationSupported` for checking if invert classification is supported.
 * Added `computeLineSegmentLineSegmentIntersection` to `Intersections2D`. [#7228](https://github.com/AnalyticalGraphicsInc/Cesium/pull/7228)
 

Source/Renderer/AutomaticUniforms.js

@@ -1686,6 +1686,34 @@ define([
             getValue : function(uniformState) {
                 return uniformState.invertClassificationColor;
             }
+        }),
+
+        /**
+         * An automatic GLSL uniform that is used for gamma correction.
+         *
+         * @alias czm_gamma
+         * @glslUniform
+         */
+        czm_gamma : new AutomaticUniform({
+            size : 1,
+            datatype : WebGLConstants.FLOAT,
+            getValue : function(uniformState) {
+                return uniformState.gamma;
+            }
+        }),
+
+        /**
+         * An automatic GLSL uniform that defines the color of light emitted by the sun.
+         *
+         * @alias czm_sunColor
+         * @glslUniform
+         */
+        czm_sunColor: new AutomaticUniform({
+            size: 1,
+            datatype: WebGLConstants.FLOAT_VEC3,
+            getValue: function(uniformState) {
+                return uniformState.sunColor;
+            }
         })
     };
 

Source/Renderer/UniformState.js

@@ -46,6 +46,10 @@ define([
          * @type {Texture}
          */
         this.globeDepthTexture = undefined;
+        /**
+         * @type {Number}
+         */
+        this.gamma = undefined;
 
         this._viewport = new BoundingRectangle();
         this._viewportCartesian4 = new Cartesian4();
@@ -143,6 +147,7 @@ define([
         this._sunPositionColumbusView = new Cartesian3();
         this._sunDirectionWC = new Cartesian3();
         this._sunDirectionEC = new Cartesian3();
+        this._sunColor = new Cartesian3();
         this._moonDirectionEC = new Cartesian3();
 
         this._pass = undefined;
@@ -737,6 +742,17 @@ define([
             }
         },
 
+        /**
+         * The color of the light emitted by the sun.
+         * @memberof UniformState.prototype
+         * @type {Color}
+         */
+        sunColor: {
+            get: function() {
+                return this._sunColor;
+            }
+        },
+
         /**
          * A normalized vector to the moon in eye coordinates at the current scene time.  In 3D mode, this
          * returns the actual vector from the camera position to the moon position.  In 2D and Columbus View, it returns
@@ -1069,6 +1085,7 @@ define([
         }
 
         setSunAndMoonDirections(this, frameState);
+        this._sunColor = Cartesian3.clone(frameState.sunColor, this._sunColor);
 
         var brdfLutGenerator = frameState.brdfLutGenerator;
         var brdfLut = defined(brdfLutGenerator) ? brdfLutGenerator.colorTexture : undefined;