Add support for glTF EXT_texture_webp

Source/Core/FeatureDetection.js

@@ -1,11 +1,15 @@
 define([
         './defaultValue',
         './defined',
-        './Fullscreen'
+        './Fullscreen',
+        './RuntimeError',
+        '../ThirdParty/when'
     ], function(
         defaultValue,
         defined,
-        Fullscreen) {
+        Fullscreen,
+        RuntimeError,
+        when) {
     'use strict';
     /*global CanvasPixelArray*/
 
@@ -199,6 +203,36 @@ define([
         return supportsImageRenderingPixelated() ? imageRenderingValueResult : undefined;
     }
 
+    var supportsWebpResult;
+    var supportsWebpPromise;
+    function supportsWebp() {
+        // From https://developers.google.com/speed/webp/faq#how_can_i_detect_browser_support_for_webp
+        if (!defined(supportsWebpPromise)) {
+            var webpDataUri = 'UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA';
+            var image = new Image();
+            supportsWebpPromise = when.defer();
+            image.onload = function () {
+                supportsWebpResult = (image.width > 0) && (image.height > 0);
+                supportsWebpPromise.resolve(supportsWebpResult);
+            };
+
+            image.onerror = function () {
+                supportsWebpResult = false;
+                supportsWebpPromise.resolve(supportsWebpResult);
+            };
+
+            image.src = 'data:image/webp;base64,' + webpDataUri;
+
+            return supportsWebpPromise;
+        }
+
+        if (!defined(supportsWebpResult)) {
+            return supportsWebpPromise;
+        }
+
+        return when(supportsWebpResult);
+    }
+
     var typedArrayTypes = [];
     if (typeof ArrayBuffer !== 'undefined') {
         typedArrayTypes.push(Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array);
@@ -235,6 +269,7 @@ define([
         hardwareConcurrency : defaultValue(theNavigator.hardwareConcurrency, 3),
         supportsPointerEvents : supportsPointerEvents,
         supportsImageRenderingPixelated: supportsImageRenderingPixelated,
+        supportsWebp: supportsWebp,
         imageRenderingValue: imageRenderingValue,
         typedArrayTypes: typedArrayTypes
     };

Source/Scene/Model.js

@@ -162,6 +162,13 @@ define([
         return {};
     }
 
+    // Cache the value of supportsWebp since it can take up to 300 ms to resolve.
+    var supportsWebp;
+    FeatureDetection.supportsWebp()
+    .then(function(result) {
+        supportsWebp = result;
+    });
+
     var boundingSphereCartesian3Scratch = new Cartesian3();
 
     var ModelState = ModelUtility.ModelState;
@@ -1650,6 +1657,10 @@ define([
             var gltfImage = images[imageId];
             var extras = gltfImage.extras;
 
+            if (defined(gltfImage.extensions) && defined(gltfImage.extensions.EXT_image_webp) && supportsWebp) {
+                gltfImage = gltfImage.extensions.EXT_image_webp;
+            }
+
             var bufferViewId = gltfImage.bufferView;
             var mimeType = gltfImage.mimeType;
             uri = gltfImage.uri;

Source/Scene/ModelUtility.js

@@ -10,6 +10,7 @@ define([
         '../Core/Matrix3',
         '../Core/Matrix4',
         '../Core/Quaternion',
+        '../Core/FeatureDetection',
         '../Core/RuntimeError',
         '../Core/WebGLConstants',
         '../Renderer/ShaderSource',
@@ -30,6 +31,7 @@ define([
         Matrix3,
         Matrix4,
         Quaternion,
+        FeatureDetection,
         RuntimeError,
         WebGLConstants,
         ShaderSource,
@@ -45,6 +47,13 @@ define([
      */
     var ModelUtility = {};
 
+    // Cache the value of supportsWebp since it can take up to 300 ms to resolve.
+    var supportsWebp;
+    FeatureDetection.supportsWebp()
+    .then(function(result) {
+        supportsWebp = result;
+    });
+
     /**
      * Updates the model's forward axis if the model is not a 2.0 model.
      *
@@ -491,7 +500,8 @@ define([
         'KHR_techniques_webgl' : true,
         'KHR_materials_unlit' : true,
         'KHR_materials_pbrSpecularGlossiness' : true,
-        'WEB3D_quantized_attributes' : true
+        'WEB3D_quantized_attributes' : true,
+        'EXT_image_webp' : true
     };
 
     ModelUtility.checkSupportedExtensions = function(extensionsRequired) {
@@ -500,6 +510,10 @@ define([
                 if (!ModelUtility.supportedExtensions[extension]) {
                     throw new RuntimeError('Unsupported glTF Extension: ' + extension);
                 }
+
+                if (extension === 'EXT_image_webp' && supportsWebp === false) {
+                    throw new RuntimeError('Loaded model requires WebP but browser does not support it.');
+                }
             }
         }
     };

Specs/Data/Models/Box-Textured-Webp/CesiumBoxWebp.gltf

@@ -0,0 +1,219 @@
+{
+  "asset": {
+    "generator": "COLLADA2GLTF",
+    "version": "2.0"
+  },
+  "extensionsUsed": [
+    "EXT_image_webp"
+  ],
+  "scene": 0,
+  "scenes": [
+    {
+      "nodes": [
+        0
+      ]
+    }
+  ],
+  "nodes": [
+    {
+      "children": [
+        1
+      ],
+      "matrix": [
+        1,
+        0,
+        0,
+        0,
+        0,
+        0,
+        -1,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1
+      ]
+    },
+    {
+      "mesh": 0
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
+        {
+          "attributes": {
+            "NORMAL": 1,
+            "POSITION": 2,
+            "TEXCOORD_0": 3
+          },
+          "indices": 0,
+          "mode": 4,
+          "material": 0
+        }
+      ],
+      "name": "Mesh"
+    }
+  ],
+  "accessors": [
+    {
+      "bufferView": 0,
+      "byteOffset": 0,
+      "componentType": 5123,
+      "count": 36,
+      "max": [
+        23
+      ],
+      "min": [
+        0
+      ],
+      "type": "SCALAR"
+    },
+    {
+      "bufferView": 1,
+      "byteOffset": 0,
+      "componentType": 5126,
+      "count": 24,
+      "max": [
+        1,
+        1,
+        1
+      ],
+      "min": [
+        -1,
+        -1,
+        -1
+      ],
+      "type": "VEC3"
+    },
+    {
+      "bufferView": 1,
+      "byteOffset": 288,
+      "componentType": 5126,
+      "count": 24,
+      "max": [
+        0.5,
+        0.5,
+        0.5
+      ],
+      "min": [
+        -0.5,
+        -0.5,
+        -0.5
+      ],
+      "type": "VEC3"
+    },
+    {
+      "bufferView": 2,
+      "byteOffset": 0,
+      "componentType": 5126,
+      "count": 24,
+      "max": [
+        6,
+        1
+      ],
+      "min": [
+        0,
+        0
+      ],
+      "type": "VEC2"
+    }
+  ],
+  "materials": [
+    {
+      "pbrMetallicRoughness": {
+        "baseColorTexture": {
+          "index": 0,
+          "texCoord": 0
+        },
+        "metallicFactor": 0,
+        "baseColorFactor": [
+          1,
+          1,
+          1,
+          1
+        ],
+        "roughnessFactor": 1
+      },
+      "name": "Texture",
+      "emissiveFactor": [
+        0,
+        0,
+        0
+      ],
+      "alphaMode": "OPAQUE",
+      "doubleSided": false
+    }
+  ],
+  "textures": [
+    {
+      "sampler": 0,
+      "source": 0
+    }
+  ],
+  "images": [
+    {
+      "extensions": {
+        "EXT_image_webp": {
+          "name": "cesium logo",
+          "bufferView": 3,
+          "mimeType": "image/webp"
+        }
+      },
+      "name": "cesium logo",
+      "bufferView": 4,
+      "mimeType": "image/png"
+    }
+  ],
+  "samplers": [
+    {
+      "magFilter": 9729,
+      "minFilter": 9986,
+      "wrapS": 10497,
+      "wrapT": 10497
+    }
+  ],
+  "bufferViews": [
+    {
+      "buffer": 0,
+      "byteOffset": 0,
+      "byteLength": 72,
+      "target": 34963
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 72,
+      "byteLength": 576,
+      "byteStride": 12,
+      "target": 34962
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 648,
+      "byteLength": 192,
+      "byteStride": 8,
+      "target": 34962
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 840,
+      "byteLength": 2466
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 3308,
+      "byteLength": 5383
+    }
+  ],
+  "buffers": [
+    {
+      "name": "box-textured-separate",
+      "byteLength": 8692,
+      "uri": 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"
+    }
+  ]
+}