diff --git a/src/xenia/gpu/d3d12/texture_cache.cc b/src/xenia/gpu/d3d12/texture_cache.cc
index 67c9fd2f7..898ee7f4d 100644
--- a/src/xenia/gpu/d3d12/texture_cache.cc
+++ b/src/xenia/gpu/d3d12/texture_cache.cc
@@ -2093,14 +2093,35 @@ void TextureCache::BindingInfoFromFetchConstant(
     // No texture data at all.
     return;
   }
-  // TODO(Triang3l): Support long 1D textures.
-  if (fetch.dimension == xenos::DataDimension::k1D &&
-      width > xenos::kTexture2DCubeMaxWidthHeight) {
-    XELOGE(
-        "1D texture is too wide ({}) - ignoring! "
-        "Report the game to Xenia developers",
-        width);
-    return;
+  if (fetch.dimension == xenos::DataDimension::k1D) {
+    bool is_invalid_1d = false;
+    // TODO(Triang3l): Support long 1D textures.
+    if (width > xenos::kTexture2DCubeMaxWidthHeight) {
+      XELOGE(
+          "1D texture is too wide ({}) - ignoring! Report the game to Xenia "
+          "developers",
+          width);
+      is_invalid_1d = true;
+    }
+    assert_false(fetch.tiled);
+    if (fetch.tiled) {
+      XELOGE(
+          "1D texture has tiling enabled in the fetch constant, but this "
+          "appears to be completely wrong - ignoring! Report the game to Xenia "
+          "developers");
+      is_invalid_1d = true;
+    }
+    assert_false(fetch.packed_mips);
+    if (fetch.packed_mips) {
+      XELOGE(
+          "1D texture has packed mips enabled in the fetch constant, but this "
+          "appears to be completely wrong - ignoring! Report the game to Xenia "
+          "developers");
+      is_invalid_1d = true;
+    }
+    if (is_invalid_1d) {
+      return;
+    }
   }
 
   xenos::TextureFormat format = GetBaseFormat(fetch.format);
@@ -2411,7 +2432,7 @@ bool TextureCache::LoadTextureData(Texture* texture) {
       if (!level_packed) {
         // Loading the packed tail for the base - load the whole tail to copy
         // regions out of it.
-        const texture_util::TextureGuestLevelLayout& guest_layout_base =
+        const texture_util::TextureGuestLayout::Level& guest_layout_base =
             texture->guest_layout.base;
         host_slice_layout_base.Footprint.Width =
             guest_layout_base.x_extent_blocks * block_width;
@@ -2452,7 +2473,7 @@ bool TextureCache::LoadTextureData(Texture* texture) {
         if (level == level_packed) {
           // Loading the packed tail for the mips - load the whole tail to copy
           // regions out of it.
-          const texture_util::TextureGuestLevelLayout&
+          const texture_util::TextureGuestLayout::Level&
               guest_layout_packed_mips = texture->guest_layout.mips[level];
           host_slice_layout_mip.Footprint.Width =
               guest_layout_packed_mips.x_extent_blocks * block_width;
@@ -2634,7 +2655,7 @@ bool TextureCache::LoadTextureData(Texture* texture) {
       load_constants.guest_offset +=
           texture->guest_layout.mip_offsets_bytes[level];
     }
-    const texture_util::TextureGuestLevelLayout& level_guest_layout =
+    const texture_util::TextureGuestLayout::Level& level_guest_layout =
         is_base ? texture->guest_layout.base
                 : texture->guest_layout.mips[level];
     uint32_t level_guest_pitch = level_guest_layout.row_pitch_bytes;
diff --git a/src/xenia/gpu/draw_util.cc b/src/xenia/gpu/draw_util.cc
index be6d0826b..8612038a0 100644
--- a/src/xenia/gpu/draw_util.cc
+++ b/src/xenia/gpu/draw_util.cc
@@ -960,10 +960,10 @@ bool GetResolveInfo(const RegisterFile& regs, const Memory& memory,
     // Need a subregion size, not the full subresource size - thus not aligning
     // to xenos::kTextureSubresourceAlignmentBytes.
     copy_dest_length =
-        texture_util::GetGuestLevelLayout(
+        texture_util::GetGuestTextureLayout(
             dest_dimension, copy_dest_pitch_aligned_div_32, uint32_t(x1 - x0),
-            dest_height, dest_depth, true, dest_format, false, 0, false)
-            .level_data_extent_bytes;
+            dest_height, dest_depth, true, dest_format, false, true, 0)
+            .base.level_data_extent_bytes;
   } else {
     XELOGE("Tried to resolve to format {}, which is not a ColorFormat",
            dest_format_info.name);
diff --git a/src/xenia/gpu/texture_util.cc b/src/xenia/gpu/texture_util.cc
index ffe74b8e2..bd7a78c6c 100644
--- a/src/xenia/gpu/texture_util.cc
+++ b/src/xenia/gpu/texture_util.cc
@@ -204,35 +204,22 @@ bool GetPackedMipOffset(uint32_t width, uint32_t height, uint32_t depth,
   return true;
 }
 
-TextureGuestLevelLayout GetGuestLevelLayout(
+TextureGuestLayout GetGuestTextureLayout(
     xenos::DataDimension dimension, uint32_t base_pitch_texels_div_32,
     uint32_t width_texels, uint32_t height_texels, uint32_t depth_or_array_size,
-    bool is_tiled, xenos::TextureFormat format, bool is_mip, uint32_t level,
-    bool is_packed_level) {
-  // If with packed mips the mips 1... happen to be packed in what's stored as
-  // mip 0, this mip tail appears to be stored like mips (with power of two size
-  // rounding) rather than like the base level (with the pitch from the fetch
-  // constant), so we distinguish between them for mip == 0.
-  // Base is by definition the level 0.
-  assert_false(!is_mip && level);
-  // Level 0 for mips is the special case for a packed mip tail of very small
-  // textures, where the tail is stored like it's at the level 0.
-  assert_false(is_mip && !level && !is_packed_level);
+    bool is_tiled, xenos::TextureFormat format, bool has_packed_levels,
+    bool has_base, uint32_t max_level) {
+  TextureGuestLayout layout;
 
-  TextureGuestLevelLayout layout;
-
-  // For safety, for instance, with empty resolve regions (extents calculation
-  // may overflow otherwise due to the assumption of at least one row, for
-  // example, but an empty texture is empty anyway).
-  if (!width_texels ||
-      (dimension != xenos::DataDimension::k1D && !height_texels) ||
-      ((dimension == xenos::DataDimension::k2DOrStacked ||
-        dimension == xenos::DataDimension::k3D) &&
-       !depth_or_array_size)) {
-    std::memset(&layout, 0, sizeof(layout));
-    return layout;
+  if (dimension == xenos::DataDimension::k1D) {
+    assert_false(is_tiled);
+    // GetPackedMipOffset may result in packing along Y for `width > height`
+    // textures.
+    assert_false(has_packed_levels);
+    height_texels = 1;
   }
-
+  uint32_t depth =
+      dimension == xenos::DataDimension::k3D ? depth_or_array_size : 1;
   switch (dimension) {
     case xenos::DataDimension::k2DOrStacked:
       layout.array_size = depth_or_array_size;
@@ -244,158 +231,17 @@ TextureGuestLevelLayout GetGuestLevelLayout(
       layout.array_size = 1;
   }
 
-  const FormatInfo* format_info = FormatInfo::Get(format);
-  uint32_t bytes_per_block = format_info->bytes_per_block();
-
-  // Calculate the strides.
-  // Mips have row / depth slice strides calculated from a mip of a texture
-  // whose base size is a power of two.
-  // The base mip has tightly packed depth slices, and takes the row pitch from
-  // the fetch constant.
-  // For stride calculation purposes, mip dimensions are always aligned to
-  // 32x32x4 blocks (or x1 for the missing dimensions), including for linear
-  // textures.
-  // Linear texture rows are 256-byte-aligned.
-  uint32_t row_pitch_texels_unaligned;
-  uint32_t z_slice_stride_texel_rows_unaligned;
-  if (is_mip) {
-    row_pitch_texels_unaligned =
-        std::max(xe::next_pow2(width_texels) >> level, uint32_t(1));
-    z_slice_stride_texel_rows_unaligned =
-        std::max(xe::next_pow2(height_texels) >> level, uint32_t(1));
-  } else {
-    row_pitch_texels_unaligned = base_pitch_texels_div_32 << 5;
-    z_slice_stride_texel_rows_unaligned = height_texels;
-  }
-  uint32_t row_pitch_blocks_tile_aligned = xe::align(
-      xe::align(row_pitch_texels_unaligned, format_info->block_width) /
-          format_info->block_width,
-      xenos::kTextureTileWidthHeight);
-  layout.row_pitch_bytes = row_pitch_blocks_tile_aligned * bytes_per_block;
-  // Assuming the provided pitch is already 256-byte-aligned for linear, but
-  // considering the guest-provided pitch more important (no information about
-  // how the GPU actually handles unaligned rows).
-  if (!is_tiled && is_mip) {
-    layout.row_pitch_bytes = xe::align(layout.row_pitch_bytes,
-                                       xenos::kTextureLinearRowAlignmentBytes);
-  }
-  layout.z_slice_stride_block_rows =
-      dimension != xenos::DataDimension::k1D
-          ? xe::align(xe::align(z_slice_stride_texel_rows_unaligned,
-                                format_info->block_height) /
-                          format_info->block_height,
-                      xenos::kTextureTileWidthHeight)
-          : 1;
-  layout.array_slice_stride_bytes =
-      layout.row_pitch_bytes * layout.z_slice_stride_block_rows;
-  uint32_t z_stride_bytes = layout.array_slice_stride_bytes;
-  if (dimension == xenos::DataDimension::k3D) {
-    layout.array_slice_stride_bytes *=
-        xe::align(depth_or_array_size, xenos::kTextureTiledDepthGranularity);
-  }
-  uint32_t array_slice_stride_bytes_non_4kb_aligned =
-      layout.array_slice_stride_bytes;
-  layout.array_slice_stride_bytes =
-      xe::align(array_slice_stride_bytes_non_4kb_aligned,
-                xenos::kTextureSubresourceAlignmentBytes);
-
-  // Estimate the memory amount actually referenced by the texture, which may be
-  // smaller (especially in the 2x2 linear k_8_8_8_8 case in Test Drive
-  // Unlimited, for which 4 KB are allocated, while the stride is 8 KB) or
-  // bigger than the stride. For tiled textures, this is the dimensions aligned
-  // to 32x32x4 blocks (or x1 for the missing dimensions).
-  // For linear, doing almost the same for the mip tail (which can be used for
-  // both the mips and, if the texture is very small, the base) because it
-  // stores multiple mips outside the first mip in it in the tile padding
-  // (though there's no need to align the size to the next power of two for this
-  // purpose for mips - packed mips are only used when min(width, height) <= 16,
-  // and packing is first done along the shorter axis - even if the longer axis
-  // is larger than 32, nothing will be packed beyond the extent of the longer
-  // axis). "Almost" because for linear textures, we're rounding the size to
-  // 32x32x4 texels, not blocks - first packed mips start from 16-texel, not
-  // 16-block, shortest dimension, and are placed in 32x- or x32-texel tiles,
-  // while 32 blocks for compressed textures are bigger in memory than 32
-  // texels.
-  layout.x_extent_blocks = xe::align(width_texels, format_info->block_width) /
-                           format_info->block_width;
-  layout.y_extent_blocks =
-      dimension != xenos::DataDimension::k1D
-          ? xe::align(height_texels, format_info->block_height) /
-                format_info->block_height
-          : 1;
-  layout.z_extent =
-      dimension == xenos::DataDimension::k3D ? depth_or_array_size : 1;
-  if (is_tiled) {
-    layout.x_extent_blocks =
-        xe::align(layout.x_extent_blocks, xenos::kTextureTileWidthHeight);
-    assert_true(dimension != xenos::DataDimension::k1D);
-    layout.y_extent_blocks =
-        xe::align(layout.y_extent_blocks, xenos::kTextureTileWidthHeight);
-    if (dimension == xenos::DataDimension::k3D) {
-      layout.z_extent =
-          xe::align(layout.z_extent, xenos::kTextureTiledDepthGranularity);
-      // 3D texture addressing is pretty complex, so it's hard to determine the
-      // memory extent of a subregion - just use pitch_tiles * height_tiles *
-      // depth_tiles * bytes_per_tile at least for now, until we find a case
-      // where it causes issues. width > pitch is a very weird edge case anyway,
-      // and is extremely unlikely.
-      assert_true(layout.x_extent_blocks <= row_pitch_blocks_tile_aligned);
-      layout.array_slice_data_extent_bytes =
-          array_slice_stride_bytes_non_4kb_aligned;
-    } else {
-      // 2D 32x32-block tiles are laid out linearly in the texture.
-      // Calculate the extent as ((all rows except for the last * pitch in
-      // tiles + last row length in tiles) * bytes per tile).
-      layout.array_slice_data_extent_bytes =
-          (layout.y_extent_blocks - xenos::kTextureTileWidthHeight) *
-              layout.row_pitch_bytes +
-          bytes_per_block * layout.x_extent_blocks *
-              xenos::kTextureTileWidthHeight;
-    }
-  } else {
-    if (is_packed_level) {
-      layout.x_extent_blocks =
-          xe::align(layout.x_extent_blocks,
-                    xenos::kTextureTileWidthHeight / format_info->block_width);
-      if (dimension != xenos::DataDimension::k1D) {
-        layout.y_extent_blocks =
-            xe::align(layout.y_extent_blocks, xenos::kTextureTileWidthHeight /
-                                                  format_info->block_height);
-        if (dimension == xenos::DataDimension::k3D) {
-          layout.z_extent =
-              xe::align(layout.z_extent, xenos::kTextureTiledDepthGranularity);
-        }
-      }
-    }
-    layout.array_slice_data_extent_bytes =
-        z_stride_bytes * (layout.z_extent - 1) +
-        layout.row_pitch_bytes * (layout.y_extent_blocks - 1) +
-        bytes_per_block * layout.x_extent_blocks;
-  }
-  layout.level_data_extent_bytes =
-      layout.array_slice_stride_bytes * (layout.array_size - 1) +
-      layout.array_slice_data_extent_bytes;
-
-  return layout;
-}
-
-TextureGuestLayout GetGuestTextureLayout(
-    xenos::DataDimension dimension, uint32_t base_pitch_texels_div_32,
-    uint32_t width_texels, uint32_t height_texels, uint32_t depth_or_array_size,
-    bool is_tiled, xenos::TextureFormat format, bool has_packed_levels,
-    bool has_base, uint32_t max_level) {
-  TextureGuestLayout layout;
-
-  if (dimension == xenos::DataDimension::k1D) {
-    height_texels = 1;
+  // For safety, for instance, with empty resolve regions (extents calculation
+  // may overflow otherwise due to the assumption of at least one row, for
+  // example, but an empty texture is empty anyway).
+  if (!width_texels || !height_texels || !depth || !layout.array_size) {
+    std::memset(&layout, 0, sizeof(layout));
+    return layout;
   }
 
   // For safety, clamp the maximum level.
-  uint32_t longest_axis = std::max(width_texels, height_texels);
-  if (dimension == xenos::DataDimension::k3D) {
-    longest_axis = std::max(longest_axis, depth_or_array_size);
-  }
-  uint32_t max_level_for_dimensions = xe::log2_floor(longest_axis);
+  uint32_t max_level_for_dimensions =
+      xe::log2_floor(std::max(std::max(width_texels, height_texels), depth));
   assert_true(max_level <= max_level_for_dimensions);
   max_level = std::min(max_level, max_level_for_dimensions);
   layout.max_level = max_level;
@@ -404,33 +250,210 @@ TextureGuestLayout GetGuestTextureLayout(
                             ? GetPackedMipLevel(width_texels, height_texels)
                             : UINT32_MAX;
 
-  if (has_base) {
-    layout.base =
-        GetGuestLevelLayout(dimension, base_pitch_texels_div_32, width_texels,
-                            height_texels, depth_or_array_size, is_tiled,
-                            format, false, 0, layout.packed_level == 0);
-  } else {
+  // Clear unused level layouts to zero strides/sizes.
+  if (!has_base) {
     std::memset(&layout.base, 0, sizeof(layout.base));
   }
-
-  std::memset(layout.mips, 0, sizeof(layout.mips));
-  std::memset(layout.mip_offsets_bytes, 0, sizeof(layout.mip_offsets_bytes));
+  if (layout.packed_level != 0) {
+    std::memset(&layout.mips[0], 0, sizeof(layout.mips[0]));
+  }
+  uint32_t max_stored_level = std::min(max_level, layout.packed_level);
+  {
+    uint32_t mips_end = max_stored_level + 1;
+    assert_true(mips_end <= xe::countof(layout.mips));
+    uint32_t mips_unused_count = uint32_t(xe::countof(layout.mips)) - mips_end;
+    if (mips_unused_count) {
+      std::memset(&layout.mips[mips_end], 0,
+                  sizeof(layout.mips[0]) * mips_unused_count);
+      std::memset(&layout.mip_offsets_bytes[mips_end], 0,
+                  sizeof(layout.mip_offsets_bytes[0]) * mips_unused_count);
+    }
+  }
   layout.mips_total_extent_bytes = 0;
-  if (max_level) {
-    uint32_t mip_offset_bytes = 0;
-    uint32_t max_stored_mip = std::min(max_level, layout.packed_level);
-    for (uint32_t mip = std::min(uint32_t(1), layout.packed_level);
-         mip <= max_stored_mip; ++mip) {
-      layout.mip_offsets_bytes[mip] = mip_offset_bytes;
-      TextureGuestLevelLayout& mip_layout = layout.mips[mip];
-      mip_layout =
-          GetGuestLevelLayout(dimension, base_pitch_texels_div_32, width_texels,
-                              height_texels, depth_or_array_size, is_tiled,
-                              format, true, mip, mip == layout.packed_level);
+
+  const FormatInfo* format_info = FormatInfo::Get(format);
+  uint32_t bytes_per_block = format_info->bytes_per_block();
+
+  // The loop counter can mean two things depending on whether the packed mip
+  // tail is stored as mip 0, because in this case, it would be ambiguous since
+  // both the base and the mips would be on "level 0", but stored separately and
+  // possibly with a different layout.
+  uint32_t loop_level_last;
+  if (layout.packed_level == 0) {
+    // Packed mip tail is the level 0 - may need to load mip tails for the base,
+    // the mips, or both.
+    // Loop iteration 0 - base packed mip tail.
+    // Loop iteration 1 - mips packed mip tail.
+    loop_level_last = uint32_t(max_level != 0);
+  } else {
+    // Packed mip tail is not the level 0.
+    // Loop iteration is the actual level being loaded.
+    loop_level_last = max_stored_level;
+  }
+  uint32_t mip_offset_bytes = 0;
+  for (uint32_t loop_level = has_base ? 0 : 1; loop_level <= loop_level_last;
+       ++loop_level) {
+    bool is_base = loop_level == 0;
+    uint32_t level = (layout.packed_level == 0) ? 0 : loop_level;
+    TextureGuestLayout::Level& level_layout =
+        is_base ? layout.base : layout.mips[level];
+
+    // Calculate the strides.
+    // Mips have row / depth slice strides calculated from a mip of a texture
+    // whose base size is a power of two.
+    // The base mip has tightly packed depth slices, and takes the row pitch
+    // from the fetch constant.
+    // For stride calculation purposes, mip dimensions are always aligned to
+    // 32x32x4 blocks (or x1 for the missing dimensions), including for linear
+    // textures.
+    // Linear texture rows are 256-byte-aligned.
+    uint32_t row_pitch_texels_unaligned;
+    uint32_t z_slice_stride_texel_rows_unaligned;
+    if (is_base) {
+      row_pitch_texels_unaligned = base_pitch_texels_div_32 << 5;
+      z_slice_stride_texel_rows_unaligned = height_texels;
+    } else {
+      row_pitch_texels_unaligned =
+          std::max(xe::next_pow2(width_texels) >> level, uint32_t(1));
+      z_slice_stride_texel_rows_unaligned =
+          std::max(xe::next_pow2(height_texels) >> level, uint32_t(1));
+    }
+    uint32_t row_pitch_blocks_tile_aligned = xe::align(
+        xe::align(row_pitch_texels_unaligned, format_info->block_width) /
+            format_info->block_width,
+        xenos::kTextureTileWidthHeight);
+    level_layout.row_pitch_bytes =
+        row_pitch_blocks_tile_aligned * bytes_per_block;
+    // Assuming the provided pitch is already 256-byte-aligned for linear, but
+    // considering the guest-provided pitch more important (no information about
+    // how the GPU actually handles unaligned rows).
+    if (!is_tiled && !is_base) {
+      level_layout.row_pitch_bytes = xe::align(
+          level_layout.row_pitch_bytes, xenos::kTextureLinearRowAlignmentBytes);
+    }
+    level_layout.z_slice_stride_block_rows =
+        dimension != xenos::DataDimension::k1D
+            ? xe::align(xe::align(z_slice_stride_texel_rows_unaligned,
+                                  format_info->block_height) /
+                            format_info->block_height,
+                        xenos::kTextureTileWidthHeight)
+            : 1;
+    level_layout.array_slice_stride_bytes =
+        level_layout.row_pitch_bytes * level_layout.z_slice_stride_block_rows;
+    uint32_t z_stride_bytes = level_layout.array_slice_stride_bytes;
+    if (dimension == xenos::DataDimension::k3D) {
+      level_layout.array_slice_stride_bytes *=
+          xe::align(depth_or_array_size, xenos::kTextureTiledDepthGranularity);
+    }
+    uint32_t array_slice_stride_bytes_non_4kb_aligned =
+        level_layout.array_slice_stride_bytes;
+    level_layout.array_slice_stride_bytes =
+        xe::align(array_slice_stride_bytes_non_4kb_aligned,
+                  xenos::kTextureSubresourceAlignmentBytes);
+
+    // Estimate the memory amount actually referenced by the texture, which may
+    // be smaller (especially in the 1280x720 linear k_8_8_8_8 case in Ridge
+    // Racer Unbounded, for which memory exactly for 1280x720 is allocated, and
+    // aligning the height to 32 would cause access of an unallocated page) or
+    // bigger than the stride. For tiled textures, this is the dimensions
+    // aligned to 32x32x4 blocks (or x1 for the missing dimensions).
+    uint32_t level_width_blocks =
+        xe::align(std::max(width_texels >> level, uint32_t(1)),
+                  format_info->block_width) /
+        format_info->block_width;
+    uint32_t level_height_blocks =
+        xe::align(std::max(height_texels >> level, uint32_t(1)),
+                  format_info->block_height) /
+        format_info->block_height;
+    uint32_t level_depth = std::max(depth >> level, uint32_t(1));
+    if (is_tiled) {
+      level_layout.x_extent_blocks =
+          xe::align(level_width_blocks, xenos::kTextureTileWidthHeight);
+      level_layout.y_extent_blocks =
+          xe::align(level_height_blocks, xenos::kTextureTileWidthHeight);
+      if (dimension == xenos::DataDimension::k3D) {
+        level_layout.z_extent =
+            xe::align(level_depth, xenos::kTextureTiledDepthGranularity);
+        // 3D texture addressing is pretty complex, so it's hard to determine
+        // the memory extent of a subregion - just use `pitch_tiles *
+        // height_tiles * depth_tiles * bytes_per_tile` at least for now, until
+        // we find a case where it causes issues. `width > pitch` is a very
+        // weird edge case anyway, and is extremely unlikely.
+        assert_true(level_layout.x_extent_blocks <=
+                    row_pitch_blocks_tile_aligned);
+        level_layout.array_slice_data_extent_bytes =
+            array_slice_stride_bytes_non_4kb_aligned;
+      } else {
+        level_layout.z_extent = 1;
+        // 2D 32x32-block tiles are laid out linearly in the texture.
+        // Calculate the extent as ((all rows except for the last * pitch in
+        // tiles + last row length in tiles) * bytes per tile).
+        level_layout.array_slice_data_extent_bytes =
+            (level_layout.y_extent_blocks - xenos::kTextureTileWidthHeight) *
+                level_layout.row_pitch_bytes +
+            bytes_per_block * level_layout.x_extent_blocks *
+                xenos::kTextureTileWidthHeight;
+      }
+    } else {
+      if (level == layout.packed_level) {
+        // Calculate the portion of the mip tail actually used by the needed
+        // mips. The actually used region may be significantly smaller than the
+        // full 32x32-texel-aligned tail. A 2x2 texture (for example, in Test
+        // Drive Unlimited, there's a 2x2 k_8_8_8_8 linear texture with packed
+        // mips), for instance, would have its 2x2 base at (16, 0) and its 1x1
+        // mip at (8, 0) - and we need 2 or 1 rows in these cases, not 32.
+        level_layout.x_extent_blocks = 0;
+        level_layout.y_extent_blocks = 0;
+        level_layout.z_extent = 0;
+        uint32_t packed_sublevel_last = is_base ? 0 : max_level;
+        for (uint32_t packed_sublevel = layout.packed_level;
+             packed_sublevel <= packed_sublevel_last; ++packed_sublevel) {
+          uint32_t packed_sublevel_x_blocks;
+          uint32_t packed_sublevel_y_blocks;
+          uint32_t packed_sublevel_z;
+          GetPackedMipOffset(width_texels, height_texels, depth, format,
+                             packed_sublevel, packed_sublevel_x_blocks,
+                             packed_sublevel_y_blocks, packed_sublevel_z);
+          level_layout.x_extent_blocks = std::max(
+              level_layout.x_extent_blocks,
+              packed_sublevel_x_blocks +
+                  xe::align(
+                      std::max(width_texels >> packed_sublevel, uint32_t(1)),
+                      format_info->block_width) /
+                      format_info->block_width);
+          level_layout.y_extent_blocks = std::max(
+              level_layout.y_extent_blocks,
+              packed_sublevel_y_blocks +
+                  xe::align(
+                      std::max(height_texels >> packed_sublevel, uint32_t(1)),
+                      format_info->block_height) /
+                      format_info->block_height);
+          level_layout.z_extent =
+              std::max(level_layout.z_extent,
+                       packed_sublevel_z +
+                           std::max(depth >> packed_sublevel, uint32_t(1)));
+        }
+      } else {
+        level_layout.x_extent_blocks = level_width_blocks;
+        level_layout.y_extent_blocks = level_height_blocks;
+        level_layout.z_extent = level_depth;
+      }
+      level_layout.array_slice_data_extent_bytes =
+          z_stride_bytes * (level_layout.z_extent - 1) +
+          level_layout.row_pitch_bytes * (level_layout.y_extent_blocks - 1) +
+          bytes_per_block * level_layout.x_extent_blocks;
+    }
+    level_layout.level_data_extent_bytes =
+        level_layout.array_slice_stride_bytes * (layout.array_size - 1) +
+        level_layout.array_slice_data_extent_bytes;
+
+    if (!is_base) {
+      layout.mip_offsets_bytes[level] = mip_offset_bytes;
       layout.mips_total_extent_bytes =
           std::max(layout.mips_total_extent_bytes,
-                   mip_offset_bytes + mip_layout.level_data_extent_bytes);
-      mip_offset_bytes += mip_layout.next_level_distance_bytes();
+                   mip_offset_bytes + level_layout.level_data_extent_bytes);
+      mip_offset_bytes +=
+          level_layout.array_slice_stride_bytes * layout.array_size;
     }
   }
 
diff --git a/src/xenia/gpu/texture_util.h b/src/xenia/gpu/texture_util.h
index 0c8a28644..3d9bc0e99 100644
--- a/src/xenia/gpu/texture_util.h
+++ b/src/xenia/gpu/texture_util.h
@@ -97,18 +97,20 @@ bool GetPackedMipOffset(uint32_t width, uint32_t height, uint32_t depth,
 // disassembly, which only checks the flag whether the data is packed passed to
 // it, not the level, to see if it needs to calculate the offset in the mip
 // tail, and the offset calculation function doesn't have level == 0 checks in
-// it, only early-out if level < packed tail level (which can be 0).
+// it, only early-out if level < packed tail level (which can be 0). There are
+// examples of textures with packed base, for example, in the intro level of
+// Prey (8x8 linear DXT1 - pairs of orange lights in the bottom of gambling
+// machines).
 //
 // Linear texture rows are aligned to 256 bytes, for both the base and the mips
 // (for the base, Direct3D 9 writes an already 256-byte-aligned pitch to the
 // fetch constant).
 //
 // However, all the 32x32x4 padding, being just padding, is not necessarily
-// being actually accessed, especially for linear textures. Test Drive Unlimited
-// has a 2x2 k_8_8_8_8 linear texture, and allocates 4 KB for it (with accessing
-// the page beyond it triggering an access violation), while a 32x32 k_8_8_8_8
-// linear texture, with rows aligned to 256 bytes (so stored like 64x32) would
-// take 8 KB. So, while for stride calculations all the padding must be
+// being actually accessed, especially for linear textures. Ridge Racer
+// Unbounded has a 1280x720 k_8_8_8_8 linear texture, and allocates memory for
+// exactly 1280x720, so aligning the height to 32 to 1280x736 results in access
+// violations. So, while for stride calculations all the padding must be
 // respected, for actual memory loads it's better to avoid trying to access it
 // when possible:
 // - If the pitch is bigger than the width, it's better to calculate the last
@@ -116,86 +118,69 @@ bool GetPackedMipOffset(uint32_t width, uint32_t height, uint32_t depth,
 //   in the other direction though - pitch < width is a weird situation, but
 //   probably legal, and may lead to reading data from beyond the calculated
 //   subresource stride).
-// - For linear textures (like that 2x2 example from Test Drive Unlimited), it's
-//   easy to calculate the exact memory extent that may be accessed knowing the
-//   dimensions (unlike for tiled textures with complex addressing within
-//   32x32x4-block tiles), so there's no need to align them to 32x32x4 for
-//   memory extent calculation - that's what appears to cause that crash in Test
-//   Drive Unlimited.
-//   - The exception here is the packed mip tail for linear textures, as smaller
-//     mips are stored in the 32x32x4-texel padding. However, the packed mip
-//     tail needs to be aligned only to 32x32 texels, not to 32x32 blocks - so
-//     for compressed textures, the padding may be smaller, only to 8x8 blocks.
+// - For linear textures (like that 1280x720 example from Ridge Racer
+//   Unbounded), it's easy to calculate the exact memory extent that may be
+//   accessed knowing the dimensions (unlike for tiled textures with complex
+//   addressing within 32x32x4-block tiles), so there's no need to align them to
+//   32x32x4 for memory extent calculation.
+//   - For the linear packed mip tail, the extent can be calculated as max of
+//     (block offsets + block extents) of all levels stored in it.
 //
-// 1D textures are always linear.
+// 1D textures are always linear and likely can't have packed mips (for `width >
+// height` textures, mip offset calculation may result in packing along Y).
 //
 // Array slices are stored within levels (this is different than how Direct3D
 // 10+ builds subresource indices, for instance). Each array slice or level is
 // aligned to 4 KB (but this doesn't apply to 3D texture slices within one
 // level).
 
-struct TextureGuestLevelLayout {
-  // Number of array slices within the mip.
-  uint32_t array_size;
-
-  // Distance between each row of blocks in bytes, including all the needed
-  // power of two (for mips) and 256-byte (for linear textures) alignment.
-  uint32_t row_pitch_bytes;
-  // Distance between Z slices in block rows, aligned to power of two for mips,
-  // and to tile height.
-  uint32_t z_slice_stride_block_rows;
-  // Distance between each array slice within the level in bytes, aligned to
-  // kTextureSubresourceAlignmentBytes.
-  uint32_t array_slice_stride_bytes;
-  // Distance from the beginning of the level to the next stored one.
-  uint32_t next_level_distance_bytes() const {
-    return array_slice_stride_bytes * array_size;
-  }
-
-  // Estimated amount of memory this level occupies, and variables involved in
-  // its calculation. Not aligned to kTextureSubresourceAlignmentBytes. For
-  // tiled textures, this will be rounded to 32x32x4 blocks (or 32x32x1
-  // depending on the dimension), and for the linear packed mip tail, this will
-  // be rounded to the same amount of texels, but for the linear subresources
-  // that are not the packed mip tail, this may be significantly (including less
-  // 4 KB pages) smaller than the aligned size (like for Test Drive Unlimited
-  // allocating 4 KB for a 2x2 linear k_8_8_8_8 texture that would be stored
-  // like 64x32 and take 8 KB). If the width is bigger than the pitch, this will
-  // also be taken into account for the last row so all memory actually used by
-  // the texture will be loaded, and may be bigger than the distance between
-  // array slices or levels. The purpose of this parameter is to make the memory
-  // amount that needs to be resident as close to the real amount as possible,
-  // to make sure all the needed data will be read, but also, if possible,
-  // unneeded memory pages won't be accessed (since that may trigger an access
-  // violation on the CPU).
-  uint32_t x_extent_blocks;
-  uint32_t y_extent_blocks;
-  uint32_t z_extent;
-  uint32_t array_slice_data_extent_bytes;
-  uint32_t level_data_extent_bytes;
-};
-
-// is_base == true - level must be 0 (for the base_address part).
-// is_base == false - level may be 0 if is_packed_level is true (for the packed
-// tail of mip_address part if the texture is very small so the tail is stored
-// like mip 0).
-TextureGuestLevelLayout GetGuestLevelLayout(
-    xenos::DataDimension dimension, uint32_t base_pitch_texels_div_32,
-    uint32_t width_texels, uint32_t height_texels, uint32_t depth_or_array_size,
-    bool is_tiled, xenos::TextureFormat format, bool is_mip, uint32_t level,
-    bool is_packed_level);
-
 struct TextureGuestLayout {
-  TextureGuestLevelLayout base;
+  struct Level {
+    // Distance between each row of blocks in bytes, including all the needed
+    // power of two (for mips) and 256-byte (for linear textures) alignment.
+    uint32_t row_pitch_bytes;
+    // Distance between Z slices in block rows, aligned to power of two for
+    // mips, and to tile height.
+    uint32_t z_slice_stride_block_rows;
+    // Distance between each array slice within the level in bytes, aligned to
+    // kTextureSubresourceAlignmentBytes. The distance to the next level is this
+    // multiplied by the array slice count.
+    uint32_t array_slice_stride_bytes;
+
+    // Estimated amount of memory this level occupies, and variables involved in
+    // its calculation. Not aligned to kTextureSubresourceAlignmentBytes. For
+    // tiled textures, this will be rounded to 32x32x4 blocks (or 32x32x1
+    // depending on the dimension), but for the linear subresources, this may be
+    // significantly (including less 4 KB pages) smaller than the aligned size
+    // (like for Ridge Racer Unbounded where aligning the height of a 1280x720
+    // linear texture results in access violations). For the linear mip tail,
+    // this includes all the mip levels stored in it. If the width is bigger
+    // than the pitch, this will also be taken into account for the last row so
+    // all memory actually used by the texture will be loaded, and may be bigger
+    // than the distance between array slices or levels. The purpose of this
+    // parameter is to make the memory amount that needs to be resident as close
+    // to the real amount as possible, to make sure all the needed data will be
+    // read, but also, if possible, unneeded memory pages won't be accessed
+    // (since that may trigger an access violation on the CPU).
+    uint32_t x_extent_blocks;
+    uint32_t y_extent_blocks;
+    uint32_t z_extent;
+    uint32_t array_slice_data_extent_bytes;
+    // Including all array slices.
+    uint32_t level_data_extent_bytes;
+  };
+
+  Level base;
   // If mip_max_level specified at calculation time is at least 1, the stored
   // mips are min(1, packed_mip_level) through min(mip_max_level,
   // packed_mip_level).
-  TextureGuestLevelLayout mips[xenos::kTexture2DCubeMaxWidthHeightLog2 + 1];
+  Level mips[xenos::kTexture2DCubeMaxWidthHeightLog2 + 1];
   uint32_t mip_offsets_bytes[xenos::kTexture2DCubeMaxWidthHeightLog2 + 1];
   uint32_t mips_total_extent_bytes;
   uint32_t max_level;
   // UINT32_MAX if there's no packed mip tail.
   uint32_t packed_level;
+  uint32_t array_size;
 };
 
 TextureGuestLayout GetGuestTextureLayout(