From ce9129749f23a640ba551a6dccbad1e64ee027a3 Mon Sep 17 00:00:00 2001
From: Masataka SUMI <santarh@gmail.com>
Date: Wed, 19 May 2021 18:08:24 +0900
Subject: [PATCH] Add principle texture colorspace tests.

---
 .../IO/Tests/4x4_gray_import_as_linear.png    | Bin 0 -> 79 bytes
 .../Tests/4x4_gray_import_as_linear.png.meta  | 116 ++++++++++++++++++
 .../GLTF/IO/Tests/4x4_gray_import_as_srgb.png | Bin 0 -> 79 bytes
 .../IO/Tests/4x4_gray_import_as_srgb.png.meta | 116 ++++++++++++++++++
 .../TextureColorSpaceSpecificationTests.cs    |  74 +++++++++++
 ...extureColorSpaceSpecificationTests.cs.meta |   3 +
 6 files changed, 309 insertions(+)
 create mode 100644 Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png
 create mode 100644 Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png.meta
 create mode 100644 Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png
 create mode 100644 Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png.meta
 create mode 100644 Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs
 create mode 100644 Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs.meta

diff --git a/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png b/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png
new file mode 100644
index 0000000000000000000000000000000000000000..9716d31247798700b498a7e3f9c095b80b5cafb9
GIT binary patch
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bY-D8c&SPwCGqAJ-s$lSR^>bP0l+XkKBM1<T

literal 0
HcmV?d00001

diff --git a/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png.meta b/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png.meta
new file mode 100644
index 000000000..d40385c4f
--- /dev/null
+++ b/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_linear.png.meta
@@ -0,0 +1,116 @@
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+  - serializedVersion: 3
+    buildTarget: Android
+    maxTextureSize: 2048
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diff --git a/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png b/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png
new file mode 100644
index 0000000000000000000000000000000000000000..9716d31247798700b498a7e3f9c095b80b5cafb9
GIT binary patch
literal 79
zcmeAS@N?(olHy`uVBq!ia0vp^EFjFm1SHiab7}%9F;5rA5RRG2Yu2w%Z(vlj;5Kh>
bY-D8c&SPwCGqAJ-s$lSR^>bP0l+XkKBM1<T

literal 0
HcmV?d00001

diff --git a/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png.meta b/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png.meta
new file mode 100644
index 000000000..2f875a10b
--- /dev/null
+++ b/Assets/VRMShaders/GLTF/IO/Tests/4x4_gray_import_as_srgb.png.meta
@@ -0,0 +1,116 @@
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+guid: 0f7acf68f1798ae48a5505519abac457
+TextureImporter:
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+    linearTexture: 0
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+    mipMapsPreserveCoverage: 0
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diff --git a/Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs b/Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs
new file mode 100644
index 000000000..3fbb330f4
--- /dev/null
+++ b/Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs
@@ -0,0 +1,74 @@
+using System;
+using NUnit.Framework;
+using UnityEditor;
+using UnityEngine;
+
+namespace VRMShaders
+{
+    public sealed class TextureColorSpaceSpecificationTests
+    {
+        private static readonly string AssetPath = "Assets/VRMShaders/GLTF/IO/Tests";
+        private static readonly Texture2D SrgbGrayTex = AssetDatabase.LoadAssetAtPath<Texture2D>($"{AssetPath}/4x4_gray_import_as_srgb.png");
+        private static readonly Texture2D LinearGrayTex = AssetDatabase.LoadAssetAtPath<Texture2D>($"{AssetPath}/4x4_gray_import_as_linear.png");
+        private static readonly Color32 JustGray = new Color32(127, 127, 127, 255);
+        private static readonly Color32 SrgbGrayInSrgb = JustGray;
+        private static readonly Color32 SrgbGrayInLinear = ((Color) SrgbGrayInSrgb).linear;
+        private static readonly Color32 LinearGrayInLinear = JustGray;
+        private static readonly Color32 LinearGrayInSrgb = ((Color) LinearGrayInLinear).gamma;
+
+        [Test]
+        public void InputAssetsRawImage()
+        {
+            Assert.AreEqual(SrgbGrayInSrgb, GetFirstPixelInTexture2D(SrgbGrayTex));
+
+            // Image color space is sRGB even through Texture color space was Linear.
+            Assert.AreEqual(SrgbGrayInSrgb, GetFirstPixelInTexture2D(LinearGrayTex));
+        }
+
+        [Test]
+        public void CopyToSrgbRenderTexture()
+        {
+            var srgbRt = RenderTexture.GetTemporary(4, 4, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
+
+            Graphics.Blit(SrgbGrayTex, srgbRt);
+            Assert.AreEqual(SrgbGrayInSrgb, GetFirstPixelInRenderTexture(srgbRt));
+
+            Graphics.Blit(LinearGrayTex, srgbRt);
+            Assert.AreEqual(LinearGrayInSrgb, GetFirstPixelInRenderTexture(srgbRt));
+
+            RenderTexture.ReleaseTemporary(srgbRt);
+        }
+
+        [Test]
+        public void CopyToLinearRenderTexture()
+        {
+            var linearRt = RenderTexture.GetTemporary(4, 4, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
+
+            Graphics.Blit(SrgbGrayTex, linearRt);
+            Assert.AreEqual(SrgbGrayInLinear, GetFirstPixelInRenderTexture(linearRt));
+
+            Graphics.Blit(LinearGrayTex, linearRt);
+            Assert.AreEqual(LinearGrayInLinear, GetFirstPixelInRenderTexture(linearRt));
+
+            RenderTexture.ReleaseTemporary(linearRt);
+        }
+
+        private Color32 GetFirstPixelInTexture2D(Texture2D tex)
+        {
+            return tex.GetPixels32()[0];
+        }
+
+        private Color32 GetFirstPixelInRenderTexture(RenderTexture rt)
+        {
+            // This function copies memory values and just read, so Texture2D's color space is not important.
+            var srgbTex = new Texture2D(rt.width, rt.height, TextureFormat.ARGB32, mipChain: false, linear: false);
+            RenderTexture.active = rt;
+            srgbTex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
+            srgbTex.Apply();
+            RenderTexture.active = null;
+            var pixel = GetFirstPixelInTexture2D(srgbTex);
+            UnityEngine.Object.DestroyImmediate(srgbTex);
+            return pixel;
+        }
+    }
+}
diff --git a/Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs.meta b/Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs.meta
new file mode 100644
index 000000000..a430c5519
--- /dev/null
+++ b/Assets/VRMShaders/GLTF/IO/Tests/TextureColorSpaceSpecificationTests.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 19082be49cd24881a2f53c13de83ac70
+timeCreated: 1621413009
\ No newline at end of file