Add TextureLinearInterpolationTest

2.0/TextureLinearInterpolationTest/README.md

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+# Texture Linear Interpolation Test
+
+## Screenshot
+
+![screenshot](screenshot/screenshot.png)
+
+## Description
+
+This asset tests that linear texture interpolation is performed on linear values, i.e. after sRGB decoding. The test passes when two spheres are rendered with nearly the same color.
+
+* The first (leftmost) sphere uses only JSON-stored emissive factor of `0.5` green.
+
+* The second sphere samples its color as an interpolated value from a `2x1` texture. When interpolation happens after sRGB decoding, the final emissive value should also be about `0.5` green. An example of incorrect interpolation is shown below.
+
+  ![incorrect](screenshot/incorrect.png)
+
+## License Information
+
+Public domain ([CC0](https://creativecommons.org/publicdomain/zero/1.0/))

2.0/TextureLinearInterpolationTest/glTF/TextureLinearInterpolationTest.gltf

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+{
+    "asset": {
+        "version": "2.0"
+    },
+    "scene": 0,
+    "scenes": [
+        {
+            "nodes": [
+                0,
+                1,
+                2
+            ]
+        }
+    ],
+    "nodes": [
+        {
+            "translation": [
+                -1.5,
+                -1,
+                0
+            ],
+            "mesh": 0
+        },
+        {
+            "translation": [
+                1.5,
+                -1,
+                0
+            ],
+            "mesh": 1
+        },
+        {
+            "translation": [
+                -3,
+                0,
+                0
+            ],
+            "scale": [
+                6,
+                3,
+                1
+            ],
+            "mesh": 2
+        }
+    ],
+    "meshes": [
+        {
+            "primitives": [
+                {
+                    "attributes": {
+                        "POSITION": 0,
+                        "NORMAL": 1
+                    },
+                    "indices": 3,
+                    "material": 0
+                }
+            ]
+        },
+        {
+            "primitives": [
+                {
+                    "attributes": {
+                        "POSITION": 0,
+                        "NORMAL": 1,
+                        "TEXCOORD_0": 2
+                    },
+                    "indices": 3,
+                    "material": 1
+                }
+            ]
+        },
+        {
+            "primitives": [
+                {
+                    "attributes": {
+                        "POSITION": 4,
+                        "TEXCOORD_0": 5
+                    },
+                    "indices": 6,
+                    "material": 2
+                }
+            ]
+        }
+    ],
+    "materials": [
+        {
+            "emissiveFactor": [
+                0,
+                0.5,
+                0
+            ],
+            "pbrMetallicRoughness": {
+                "baseColorFactor": [
+                    0,
+                    0,
+                    0,
+                    1
+                ]
+            }
+        },
+        {
+            "emissiveTexture": {
+                "index": 0
+            },
+            "emissiveFactor": [
+                1,
+                1,
+                1
+            ],
+            "pbrMetallicRoughness": {
+                "baseColorFactor": [
+                    0,
+                    0,
+                    0,
+                    1
+                ]
+            }
+        },
+        {
+            "alphaMode": "MASK",
+            "doubleSided": true,
+            "emissiveFactor": [
+                1,
+                1,
+                1
+            ],
+            "emissiveTexture": {
+                "index": 1
+            },
+            "pbrMetallicRoughness": {
+                "baseColorTexture": {
+                    "index": 1
+                }
+            }
+        }
+    ],
+    "textures": [
+        {
+            "source": 0,
+            "sampler": 0
+        },
+        {
+            "source": 1
+        }
+    ],
+    "accessors": [
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+            "uri": "Sphere.bin"
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+        {
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+            "uri": "Plane.bin"
+        }
+    ],
+    "images": [
+        {
+            "uri": "0_0_0-0_255_0.png"
+        },
+        {
+            "uri": "TestLabels.png"
+        }
+    ],
+    "samplers": [
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+            "magFilter": 9729
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+}