From 311b95b9fc83eebfb8652652aaaff7fea34bb618 Mon Sep 17 00:00:00 2001
From: Wojciech Figat <wojtek@figat.pl>
Date: Mon, 14 Feb 2022 14:37:04 +0100
Subject: [PATCH] Add support for using mipmaps with 3D textures

---
 Source/Engine/Graphics/Textures/GPUTexture.cpp               | 5 -----
 Source/Engine/GraphicsDevice/DirectX/DX11/GPUContextDX11.cpp | 4 +++-
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/Source/Engine/Graphics/Textures/GPUTexture.cpp b/Source/Engine/Graphics/Textures/GPUTexture.cpp
index 6a8da9b68..a49b97070 100644
--- a/Source/Engine/Graphics/Textures/GPUTexture.cpp
+++ b/Source/Engine/Graphics/Textures/GPUTexture.cpp
@@ -431,11 +431,6 @@ bool GPUTexture::Init(const GPUTextureDescription& desc)
             LOG(Warning, "Cannot create texture. Only 2D Texture can be used as a Depth Stencil. Description: {0}", desc.ToString());
             return true;
         }
-        if (desc.MipLevels != 1)
-        {
-            LOG(Warning, "Cannot create texture. Volume texture cannot have more than 1 mip level. Description: {0}", desc.ToString());
-            return true;
-        }
         if (desc.ArraySize != 1)
         {
             LOG(Warning, "Cannot create texture. Volume texture cannot create array of volume textures. Description: {0}", desc.ToString());
diff --git a/Source/Engine/GraphicsDevice/DirectX/DX11/GPUContextDX11.cpp b/Source/Engine/GraphicsDevice/DirectX/DX11/GPUContextDX11.cpp
index f558152f1..37d4a663f 100644
--- a/Source/Engine/GraphicsDevice/DirectX/DX11/GPUContextDX11.cpp
+++ b/Source/Engine/GraphicsDevice/DirectX/DX11/GPUContextDX11.cpp
@@ -732,7 +732,9 @@ void GPUContextDX11::UpdateTexture(GPUTexture* texture, int32 arrayIndex, int32
     auto textureDX11 = static_cast<GPUTextureDX11*>(texture);
 
     const int32 subresourceIndex = RenderToolsDX::CalcSubresourceIndex(mipIndex, arrayIndex, texture->MipLevels());
-    const uint32 depthPitch = texture->IsVolume() ? slicePitch / texture->Depth() : slicePitch;
+    uint32 depthPitch = slicePitch;
+    if (texture->IsVolume())
+        depthPitch /= Math::Max(1, texture->Depth() >> mipIndex);
     _context->UpdateSubresource(textureDX11->GetResource(), subresourceIndex, nullptr, data, (UINT)rowPitch, (UINT)depthPitch);
 
     //D3D11_MAPPED_SUBRESOURCE mapped;