From 8f710a24c8a3f9653a89ba4bedf9a2f0f641c1b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Kapu=C5=9Bci=C5=84ski?= <tomaszkax86@gmail.com>
Date: Sat, 23 Apr 2022 10:50:53 +0200
Subject: [PATCH] Added proper conversion from sRGB to linear space and added a
 temporary fix for Blender bug with vertex colors in sRGB

---
 src/graphics/model/model_gltf.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/graphics/model/model_gltf.cpp b/src/graphics/model/model_gltf.cpp
index 72cb859d..817a3dfb 100644
--- a/src/graphics/model/model_gltf.cpp
+++ b/src/graphics/model/model_gltf.cpp
@@ -247,6 +247,8 @@ void GLTFLoader::ReadMaterials()
                 color[2].get<float>(),
                 0.0
             };
+
+            mat.emissiveColor = Gfx::ToLinear(mat.emissiveColor);
         }
         else
         {
@@ -283,6 +285,8 @@ void GLTFLoader::ReadMaterials()
                     color[2].get<float>(),
                     color[3].get<float>()
                 };
+
+                mat.albedoColor = Gfx::ToLinear(mat.albedoColor);
             }
             else
             {
@@ -680,6 +684,16 @@ std::vector<glm::u8vec4> GLTFLoader::ReadColors(int index)
         GetLogger()->Error("Invalid color type: %d\n", accessor.componentType);
     }
 
+    // Fix for bug in Blender where it exports vertex colors in sRGB instead of linear space
+    for (size_t i = 0; i < colors.size(); i++)
+    {
+        auto color = Gfx::IntColorToColor(Gfx::IntColor(colors[i]));
+
+        color = Gfx::ToLinear(color);
+
+        colors[i] = Gfx::ColorToIntColor(color);
+    }
+
     return colors;
 }