diff --git a/src/gpu/d3d12/SDL_gpu_d3d12.c b/src/gpu/d3d12/SDL_gpu_d3d12.c
index a67b690d78..1deff7d7b4 100644
--- a/src/gpu/d3d12/SDL_gpu_d3d12.c
+++ b/src/gpu/d3d12/SDL_gpu_d3d12.c
@@ -5925,6 +5925,7 @@ static void D3D12_UploadToTexture(
     Uint32 alignedRowPitch;
     Uint32 rowsPerSlice = source->rows_per_layer;
     Uint32 bytesPerSlice;
+    Uint32 alignedBytesPerSlice;
     bool needsRealignment;
     bool needsPlacementCopy;
 
@@ -5962,10 +5963,13 @@ static void D3D12_UploadToTexture(
 
     bytesPerSlice = rowsPerSlice * rowPitch;
 
-    alignedRowPitch = D3D12_INTERNAL_Align(rowPitch, D3D12_TEXTURE_DATA_PITCH_ALIGNMENT);
+    alignedRowPitch = BytesPerRow(destination->w, textureContainer->header.info.format);
+    alignedRowPitch = D3D12_INTERNAL_Align(alignedRowPitch, D3D12_TEXTURE_DATA_PITCH_ALIGNMENT);
     needsRealignment = rowsPerSlice != destination->h || rowPitch != alignedRowPitch;
     needsPlacementCopy = source->offset % D3D12_TEXTURE_DATA_PLACEMENT_ALIGNMENT != 0;
 
+    alignedBytesPerSlice = alignedRowPitch * destination->h;
+
     sourceLocation.Type = D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT;
     sourceLocation.PlacedFootprint.Footprint.Format = SDLToD3D12_TextureFormat[textureContainer->header.info.format];
     sourceLocation.PlacedFootprint.Footprint.RowPitch = alignedRowPitch;
@@ -5990,22 +5994,25 @@ static void D3D12_UploadToTexture(
 
         for (Uint32 sliceIndex = 0; sliceIndex < destination->d; sliceIndex += 1) {
             // copy row count minus one to avoid overread
-            for (Uint32 rowIndex = 0; rowIndex < rowsPerSlice - 1; rowIndex += 1) {
+            for (Uint32 rowIndex = 0; rowIndex < destination->h - 1; rowIndex += 1) {
+
                 SDL_memcpy(
-                    temporaryBuffer->mapPointer + (sliceIndex * rowsPerSlice) + (rowIndex * alignedRowPitch),
+                    temporaryBuffer->mapPointer + (sliceIndex * alignedBytesPerSlice) + (rowIndex * alignedRowPitch),
                     transferBufferContainer->activeBuffer->mapPointer + source->offset + (sliceIndex * bytesPerSlice) + (rowIndex * rowPitch),
-                    rowPitch);
+                    alignedRowPitch);
+
             }
-            Uint32 offset = source->offset + (sliceIndex * bytesPerSlice) + ((rowsPerSlice - 1) * rowPitch);
+            Uint32 offset = source->offset + (sliceIndex * bytesPerSlice) + ((destination->h - 1) * rowPitch);
+
             SDL_memcpy(
-                temporaryBuffer->mapPointer + (sliceIndex * rowsPerSlice) + ((rowsPerSlice - 1) * alignedRowPitch),
+                temporaryBuffer->mapPointer + (sliceIndex * alignedBytesPerSlice) + ((destination->h - 1) * alignedRowPitch),
                 transferBufferContainer->activeBuffer->mapPointer + offset,
                 SDL_min(alignedRowPitch, transferBufferContainer->size - offset));
 
             sourceLocation.PlacedFootprint.Footprint.Width = destination->w;
-            sourceLocation.PlacedFootprint.Footprint.Height = rowsPerSlice;
+            sourceLocation.PlacedFootprint.Footprint.Height = destination->h;
             sourceLocation.PlacedFootprint.Footprint.Depth = 1;
-            sourceLocation.PlacedFootprint.Offset = (sliceIndex * bytesPerSlice);
+            sourceLocation.PlacedFootprint.Offset = (sliceIndex * alignedBytesPerSlice);
 
             ID3D12GraphicsCommandList_CopyTextureRegion(
                 d3d12CommandBuffer->graphicsCommandList,
@@ -6046,7 +6053,7 @@ static void D3D12_UploadToTexture(
         sourceLocation.PlacedFootprint.Offset = 0;
         sourceLocation.PlacedFootprint.Footprint.Width = destination->w;
         sourceLocation.PlacedFootprint.Footprint.Height = destination->h;
-        sourceLocation.PlacedFootprint.Footprint.Depth = 1;
+        sourceLocation.PlacedFootprint.Footprint.Depth = destination->d;
 
         ID3D12GraphicsCommandList_CopyTextureRegion(
             d3d12CommandBuffer->graphicsCommandList,