diff --git a/GlitchyEditor/src/Ultralight/UltralightWindow.bf b/GlitchyEditor/src/Ultralight/UltralightWindow.bf
index 42f3126..f9f93e1 100644
--- a/GlitchyEditor/src/Ultralight/UltralightWindow.bf
+++ b/GlitchyEditor/src/Ultralight/UltralightWindow.bf
@@ -83,12 +83,10 @@ abstract class UltralightWindow
 	{
 		void* pixels = ulBitmapLockPixels(bitmap);
 
-		// TODO: before first resize the stride is larger than expected
-		uint32 width = ulBitmapGetWidth(bitmap);
 		uint32 height = ulBitmapGetHeight(bitmap);
 		uint32 stride = ulBitmapGetRowBytes(bitmap);
 
-		_texture.SetData<uint32>((.)pixels, 0, 0, width, height, 0, 0);
+		_texture.SetData(TextureSliceData(pixels, stride, stride * height));
 
 		ulBitmapUnlockPixels(bitmap);
 	}
diff --git a/GlitchyEngine/src/Platform/DX11/Renderer/Dx11Texture.bf b/GlitchyEngine/src/Platform/DX11/Renderer/Dx11Texture.bf
index 75f0761..4be0a5e 100644
--- a/GlitchyEngine/src/Platform/DX11/Renderer/Dx11Texture.bf
+++ b/GlitchyEngine/src/Platform/DX11/Renderer/Dx11Texture.bf
@@ -134,22 +134,99 @@ namespace GlitchyEngine.Renderer
 		{
 			Debug.Profiler.ProfileResourceFunction!();
 
+			if (slices.Length == 0)
+				return .Err;
+
+			if (slices.Length != 1)
+			{
+				Runtime.NotImplemented("PlatformSetData(Span<TextureSliceData> slices) with more than 1 slice is not implemented yet.");
+			}	
+
 			if(nativeTexture == null)
 			{
 				if (InternalCreateTexture(slices))
 					return .Ok;
 			}
 
-			Runtime.NotImplemented();
+			uint32 subresourceIndex = D3D11.CalcSubresource(0, 0, nativeDesc.MipLevels);
 
-			/*int index = firstArraySlice;
-
-			for (TextureSliceData slice in slices)
+			switch(nativeDesc.Usage)
 			{
+			case .Default:
+				Box dataBox = .(0, 0, 0, Width, Height, 1);
 
-			}*/
+				using (ContextMonitor.Enter())
+				{
+					NativeContext.UpdateSubresource(nativeTexture, subresourceIndex, &dataBox, slices[0].Data, slices[0].LinePitch, slices[0].SlicePitch);
+				}
+				
+			case .Dynamic:
+				using (ContextMonitor.Enter())
+				{
+					MappedSubresource map = ?;
+					NativeContext.Map(nativeTexture, subresourceIndex, .WriteDiscard, .None, &map);
+					
+					if (map.RowPitch > slices[subresourceIndex].LinePitch)
+					{
+						Log.EngineLogger.Error("The line pitch of the new data must be at least as large as the line pitch of the destination texture.");
+					}
+
+					for (int line < Height)
+					{
+						Internal.MemCpy(((uint8*)map.Data) + map.RowPitch * line, slices[subresourceIndex].GetLinePointer(line), map.RowPitch);
+					}
+
+					NativeContext.Unmap(nativeTexture, subresourceIndex);
+				}
+			case .Immutable:
+				Log.EngineLogger.Error("Can't set the data of an immutable resource.");
+				return .Err;
+			default:
+				Log.EngineLogger.Error($"Unknown resource usage for texture: {nativeDesc.Usage}");
+				return .Err;
+			}
+
+			return .Ok;
 		}
 
+		public struct DataBox
+		{
+			public uint32 X, Y, Z, Width, Height, Depth;
+		}
+
+		/*protected Result<void> MightySetData(void* srcData, uint32 elementSize,
+			DataBox dstBox, uint32 srcRowPitch, uint32 srcDepthSliceStride, uint32 arraySlice, uint32 mipLevel)
+		{
+			Debug.Profiler.ProfileResourceFunction!();
+
+			if(nativeTexture == null)
+			{
+				// TODO: Can we extend this function to provide multiple array slices and mip levels? Because we need it for immutable textures
+				if(dstBox.X == 0 && dstBox.Y == 0 && dstBox.Z == 0 &&
+					dstBox.Width == nativeDesc.Width && dstBox.Height == nativeDesc.Height &&
+					arraySlice == 0 && mipLevel == 0 && ArraySize == 1 && MipLevels == 1)
+				{
+					//TextureSliceData[1] dataSlice = .(.(data, elementSize * destWidth, elementSize * destWidth * destHeight));
+
+					// Turns out we need to initialize all slices at once or none... so... tough shit, we cant early out here.
+					//if (InternalCreateTexture(dataSlice))
+					//	return .Ok;
+				}
+				else
+				{
+					if (nativeDesc.Usage == .Immutable)
+					{
+						Log.EngineLogger.Error("The entire pixel data has to be provided when initializing an immutable texture.");
+						return .Err;
+					}
+
+					InternalCreateTexture(null);
+				}
+			}
+
+			return .Ok;
+		}*/
+
 		// TODO: Update Texture Arrays!
 		protected override Result<void> PlatformSetData(void* data, uint32 elementSize, uint32 destX,
 			uint32 destY, uint32 destWidth, uint32 destHeight, uint32 arraySlice, uint32 mipLevel, GlitchyEngine.Renderer.MapType mapType)
diff --git a/GlitchyEngine/src/Renderer/Texture.bf b/GlitchyEngine/src/Renderer/Texture.bf
index ef7d056..5b09e6c 100644
--- a/GlitchyEngine/src/Renderer/Texture.bf
+++ b/GlitchyEngine/src/Renderer/Texture.bf
@@ -74,6 +74,11 @@ namespace GlitchyEngine.Renderer
 			LinePitch = linePitch;
 			SlicePitch = slicePitch;
 		}
+
+		public void* GetLinePointer(int line)
+		{
+			return (uint8*)Data + LinePitch * line;
+		}
 	}
 
 	public class Texture2D : Texture
@@ -102,6 +107,19 @@ namespace GlitchyEngine.Renderer
 			return PlatformSetData(slices);
 		}
 
+		public Result<void> SetData(TextureSliceData slice)
+		{
+			if (1 != ArraySize * MipLevels)
+			{
+				Log.EngineLogger.Error("Not enough slices provided to initialize texture.");
+				return .Err;
+			}
+
+			#unwarn // This is safe, we only read from it.
+			Span<TextureSliceData> slices = .(&slice, 1);
+			return PlatformSetData(slices);
+		}
+
 		public void SetData<T>(T* data, uint32 arraySlice = 0, uint32 mipSlice = 0)
 		{
 			PlatformSetData(data, (.)sizeof(T), 0, 0, Width, Height, arraySlice, mipSlice, .Write);