1 files changed, 93 insertions, 0 deletions
diff --git a/Ryujinx.Graphics.OpenGL/Image/TextureCopyUnscaled.cs b/Ryujinx.Graphics.OpenGL/Image/TextureCopyUnscaled.cs
new file mode 100644
index 00000000..28401138
--- /dev/null
+++ b/Ryujinx.Graphics.OpenGL/Image/TextureCopyUnscaled.cs
@@ -0,0 +1,93 @@
+using OpenTK.Graphics.OpenGL;
+using Ryujinx.Common;
+using Ryujinx.Graphics.GAL;
+using System;
+
+namespace Ryujinx.Graphics.OpenGL.Image
+{
+    static class TextureCopyUnscaled
+    {
+        public static void Copy(
+            TextureCreateInfo srcInfo,
+            TextureCreateInfo dstInfo,
+            int srcHandle,
+            int dstHandle,
+            int srcLayer,
+            int dstLayer,
+            int srcLevel,
+            int dstLevel)
+        {
+            int srcWidth  = srcInfo.Width;
+            int srcHeight = srcInfo.Height;
+            int srcDepth  = srcInfo.GetDepthOrLayers();
+            int srcLevels = srcInfo.Levels;
+
+            int dstWidth  = dstInfo.Width;
+            int dstHeight = dstInfo.Height;
+            int dstDepth  = dstInfo.GetDepthOrLayers();
+            int dstLevels = dstInfo.Levels;
+
+            dstWidth = Math.Max(1, dstWidth >> dstLevel);
+            dstHeight = Math.Max(1, dstHeight >> dstLevel);
+
+            if (dstInfo.Target == Target.Texture3D)
+            {
+                dstDepth = Math.Max(1, dstDepth >> dstLevel);
+            }
+
+            // When copying from a compressed to a non-compressed format,
+            // the non-compressed texture will have the size of the texture
+            // in blocks (not in texels), so we must adjust that size to
+            // match the size in texels of the compressed texture.
+            if (!srcInfo.IsCompressed && dstInfo.IsCompressed)
+            {
+                dstWidth  = BitUtils.DivRoundUp(dstWidth,  dstInfo.BlockWidth);
+                dstHeight = BitUtils.DivRoundUp(dstHeight, dstInfo.BlockHeight);
+            }
+            else if (srcInfo.IsCompressed && !dstInfo.IsCompressed)
+            {
+                dstWidth  *= dstInfo.BlockWidth;
+                dstHeight *= dstInfo.BlockHeight;
+            }
+
+            int width  = Math.Min(srcWidth,  dstWidth);
+            int height = Math.Min(srcHeight, dstHeight);
+            int depth  = Math.Min(srcDepth,  dstDepth);
+            int levels = Math.Min(srcLevels, dstLevels);
+
+            for (int level = 0; level < levels; level++)
+            {
+                // Stop copy if we are already out of the levels range.
+                if (level >= srcInfo.Levels || dstLevel + level >= dstInfo.Levels)
+                {
+                    break;
+                }
+
+                GL.CopyImageSubData(
+                    srcHandle,
+                    srcInfo.Target.ConvertToImageTarget(),
+                    srcLevel + level,
+                    0,
+                    0,
+                    srcLayer,
+                    dstHandle,
+                    dstInfo.Target.ConvertToImageTarget(),
+                    dstLevel + level,
+                    0,
+                    0,
+                    dstLayer,
+                    width,
+                    height,
+                    depth);
+
+                width = Math.Max(1, width >> 1);
+                height = Math.Max(1, height >> 1);
+
+                if (srcInfo.Target == Target.Texture3D)
+                {
+                    depth = Math.Max(1, depth >> 1);
+                }
+            }
+        }
+    }
+}