diff --git a/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp b/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
index 9e4e58150..f72d8eb72 100644
--- a/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
+++ b/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
@@ -6019,10 +6019,7 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
             return;
         }
 
-		DWORD D3DLockFlags = D3DLOCK_NOSYSLOCK;
-
 		DWORD dwCubeFaceOffset = 0;
-		DWORD dwCubeFaceSize = 0;
 		D3DCUBEMAP_FACES last_face = (bCubemap) ? D3DCUBEMAP_FACE_NEGATIVE_Z : D3DCUBEMAP_FACE_POSITIVE_X;
 
 		// Block size only applies to compressed DXT formats
@@ -6036,11 +6033,10 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 		for (int face = D3DCUBEMAP_FACE_POSITIVE_X; face <= last_face; face++) {
 			// As we iterate through mipmap levels, we'll adjust the source resource offset
 			DWORD dwMipOffset = 0;
-			DWORD pxMipWidth = xboxWidth;
-			DWORD pxMipHeight = xboxHeight;
-			DWORD pxMipDepth = dwDepth;
-            DWORD dwMipRowPitch = dwRowPitch;
-			DWORD dwSrcSlicePitch = dwMipRowPitch * pxMipHeight; // TODO
+			DWORD pxMipWidth = xboxWidth; // the current mip width in pixels
+			DWORD pxMipHeight = xboxHeight; // the current mip height in pixels
+			DWORD pxMipDepth = dwDepth; // the current mip depth in pixels
+			DWORD dwMipRowPitch = dwRowPitch; // bytes to the next row of pixels (or DXT blocks)
 
 			for (unsigned int mipmap_level = 0; mipmap_level < dwMipMapLevels; mipmap_level++) {
 
@@ -6048,16 +6044,18 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 				DWORD numRows = pxMipHeight;
 
 				if (bCompressed) {
-					// Each row contains a 4x4 pixel blocks, instead of single pixels
+					// Each row contains a 4x4 pixel DXT blocks, instead of single pixels
 					// So divide by 4 to get the number of rows
 					numRows = (numRows + 3) / 4;
 				}
 
-				DWORD dwMipSize = dwMipRowPitch * numRows;
+				DWORD mip2dSize = dwMipRowPitch * numRows; // the size of one layer of the mip slice
+				DWORD mipSlicePitch = mip2dSize * pxMipDepth; // the total size of the mip slice (depth is only > 1 for volume textures)
 
 				// Lock the host resource
 				D3DLOCKED_RECT LockedRect = {};
 				D3DLOCKED_BOX LockedBox = {};
+				DWORD D3DLockFlags = D3DLOCK_NOSYSLOCK;
 
 				switch (XboxResourceType) {
 				case xbox::X_D3DRTYPE_SURFACE:
@@ -6123,7 +6121,7 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 					if (!skipDueToNoPalette) {
 						if (!ConvertD3DTextureToARGBBuffer(
 							X_Format,
-							pSrc, pxMipWidth, pxMipHeight, dwMipRowPitch, dwMipSize,//use dwMipSize instead of dwSrcSlicePitch here, because the mipSize changed in 3D mip map.
+							pSrc, pxMipWidth, pxMipHeight, dwMipRowPitch, mip2dSize,
 							pDst, dwDstRowPitch, dwDstSlicePitch,
 							pxMipDepth,//used pxMipDepth here because in 3D mip map the 3rd dimension also shrinked to 1/2 at each mip level.
 							iTextureStage)) {
@@ -6140,7 +6138,7 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 					);
 				}
 				else if (bCompressed) {
-					memcpy(pDst, pSrc, dwMipSize);
+					memcpy(pDst, pSrc, mip2dSize);
 				}
 				else {
 					/* TODO : // Let DirectX convert the surface (including palette formats) :
@@ -6159,7 +6157,7 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 					} else {
 					*/
 					if ((dwDstRowPitch == dwMipRowPitch) && (dwMipRowPitch == pxMipWidth * dwBPP)) {
-						memcpy(pDst, pSrc, dwMipSize);
+						memcpy(pDst, pSrc, mip2dSize);
 					}
 					else {
 						for (DWORD v = 0; v < pxMipHeight; v++) {
@@ -6195,12 +6193,8 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 					EmuLog(LOG_LEVEL::WARNING, "Unlocking host %s failed!", ResourceTypeName);
 				}
 
-				if (face == D3DCUBEMAP_FACE_POSITIVE_X) {
-					dwCubeFaceSize += pxMipDepth * dwMipSize;
-				}
-
 				// Calculate the next mipmap level dimensions
-				dwMipOffset += pxMipDepth * dwMipSize;//for 3D volumeTexture, the dwDepth >1 in mip_level 0, pxMipDepth must be multiplied.
+				dwMipOffset += mipSlicePitch;
 				if (pxMipWidth > 1) {
 					pxMipWidth /= 2;
 
@@ -6222,11 +6216,7 @@ void CreateHostResource(xbox::X_D3DResource *pResource, DWORD D3DUsage, int iTex
 				}
 			} // for mipmap levels
 
-			if (face == D3DCUBEMAP_FACE_POSITIVE_X) {
-				dwCubeFaceSize = ROUND_UP(dwCubeFaceSize, X_D3DTEXTURE_CUBEFACE_ALIGNMENT);
-			}
-
-			dwCubeFaceOffset += dwCubeFaceSize;
+			dwCubeFaceOffset += dwSlicePitch;
 		} // for cube faces