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Merge pull request #297 from KhronosGroup/interpolation
Add TextureLinearInterpolationTest
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‎2.0/TextureLinearInterpolationTest/README.md

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# Texture Linear Interpolation Test
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## Screenshot
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![screenshot](screenshot/screenshot.png)
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## Description
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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.
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* The first (leftmost) sphere uses only JSON-stored emissive factor of `0.5` green.
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* 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.
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![incorrect](screenshot/incorrect.png)
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## License Information
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Public domain ([CC0](https://creativecommons.org/publicdomain/zero/1.0/))

‎2.0/TextureLinearInterpolationTest/glTF-Binary/TextureLinearInterpolationTest.glb

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‎2.0/TextureLinearInterpolationTest/glTF/0_0_0-0_255_0.png

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‎2.0/TextureLinearInterpolationTest/glTF/Plane.bin

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‎2.0/TextureLinearInterpolationTest/glTF/Sphere.bin

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‎2.0/TextureLinearInterpolationTest/glTF/TestLabels.png

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‎2.0/TextureLinearInterpolationTest/glTF/TextureLinearInterpolationTest.gltf

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{
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"asset": {
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"version": "2.0"
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},
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"scene": 0,
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"scenes": [
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{
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"nodes": [
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0,
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1,
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2
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]
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}
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],
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"nodes": [
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{
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"translation": [
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-1.5,
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-1,
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0
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],
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"mesh": 0
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},
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{
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"translation": [
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1.5,
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-1,
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0
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],
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"mesh": 1
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},
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{
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"translation": [
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-3,
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0,
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0
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],
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"scale": [
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6,
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3,
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1
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],
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"mesh": 2
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}
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],
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"meshes": [
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{
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"primitives": [
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{
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"attributes": {
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"POSITION": 0,
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"NORMAL": 1
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},
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"indices": 3,
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"material": 0
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}
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]
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},
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{
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"primitives": [
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{
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"attributes": {
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"POSITION": 0,
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"NORMAL": 1,
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"TEXCOORD_0": 2
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},
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"indices": 3,
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"material": 1
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}
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]
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},
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{
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"primitives": [
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{
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"attributes": {
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"POSITION": 4,
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"TEXCOORD_0": 5
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},
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"indices": 6,
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"material": 2
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}
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]
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}
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],
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"materials": [
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{
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"emissiveFactor": [
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0,
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0.5,
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0
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],
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"pbrMetallicRoughness": {
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"baseColorFactor": [
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0,
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0,
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0,
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1
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]
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}
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},
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{
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"emissiveTexture": {
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"index": 0
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},
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"emissiveFactor": [
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1,
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1,
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1
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],
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"pbrMetallicRoughness": {
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"baseColorFactor": [
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0,
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0,
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0,
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1
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]
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}
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},
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{
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"alphaMode": "MASK",
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"doubleSided": true,
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"emissiveFactor": [
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1,
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1,
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1
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],
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"emissiveTexture": {
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"index": 1
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},
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"pbrMetallicRoughness": {
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"baseColorTexture": {
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"index": 1
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}
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}
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}
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],
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"textures": [
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{
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"source": 0,
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"sampler": 0
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},
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{
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"source": 1
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}
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],
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"accessors": [
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{
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"bufferView": 0,
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"componentType": 5126,
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"count": 205,
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"max": [
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1,
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1,
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0.9999999403953552
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],
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"min": [
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-0.9999999403953552,
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-1,
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-0.9999999403953552
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],
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"type": "VEC3"
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},
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{
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"bufferView": 1,
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"componentType": 5126,
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"count": 205,
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"type": "VEC3"
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},
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{
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"bufferView": 2,
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"componentType": 5126,
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"count": 205,
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"type": "VEC2"
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},
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{
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"bufferView": 3,
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"componentType": 5123,
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"count": 960,
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"type": "SCALAR"
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},
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{
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"bufferView": 4,
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"componentType": 5126,
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"count": 4,
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"max": [
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1,
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1,
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0
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],
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"min": [
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0,
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0,
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0
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],
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"type": "VEC3"
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},
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{
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"bufferView": 5,
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"componentType": 5126,
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"count": 4,
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"type": "VEC2"
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},
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{
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"bufferView": 6,
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"componentType": 5123,
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"count": 6,
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"type": "SCALAR"
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}
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],
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"bufferViews": [
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{
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"buffer": 0,
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"byteLength": 2460,
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"byteOffset": 0
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},
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{
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"buffer": 0,
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"byteLength": 2460,
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"byteOffset": 2460
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},
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{
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"buffer": 0,
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"byteLength": 1640,
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"byteOffset": 4920
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},
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{
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"buffer": 0,
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"byteLength": 1920,
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"byteOffset": 6560
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},
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{
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"buffer": 1,
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"byteLength": 48,
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"byteOffset": 0
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},
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{
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"buffer": 1,
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"byteLength": 32,
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"byteOffset": 48
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},
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{
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"buffer": 1,
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"byteLength": 12,
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"byteOffset": 80
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}
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],
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"buffers": [
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{
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"byteLength": 8480,
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"uri": "Sphere.bin"
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},
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{
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"byteLength": 92,
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"uri": "Plane.bin"
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}
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],
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"images": [
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{
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"uri": "0_0_0-0_255_0.png"
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},
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{
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"uri": "TestLabels.png"
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}
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],
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"samplers": [
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{
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"minFilter": 9729,
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"magFilter": 9729
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}
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]
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}

‎2.0/TextureLinearInterpolationTest/screenshot/incorrect.png

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‎2.0/TextureLinearInterpolationTest/screenshot/screenshot.png

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