[Vulkan] Reimplemented texture conversions. Here be dragons! Probably breaks everything. Also bonus DXT3A support.

src/xenia/gpu/texture_memory_usage.cc

@@ -0,0 +1,80 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/gpu/texture_info.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include "xenia/base/math.h"
+
+namespace xe {
+namespace gpu {
+
+using namespace xe::gpu::xenos;
+
+static TextureMemoryUsage CalculateMemoryUsage(const FormatInfo* format_info,
+                                               uint32_t pitch, uint32_t height,
+                                               uint32_t depth, bool is_tiled,
+                                               bool is_guest) {
+  TextureMemoryUsage usage;
+
+  usage.pitch = pitch;
+  usage.height = height;
+  usage.block_pitch = xe::round_up(usage.pitch, format_info->block_width) /
+                      format_info->block_width;
+  usage.block_height = xe::round_up(usage.height, format_info->block_height) /
+                       format_info->block_height;
+  usage.depth = depth;
+
+  if (is_guest) {
+    // Texture dimensions must be a multiple of tile
+    // dimensions (32x32 blocks).
+    usage.block_pitch = xe::round_up(usage.block_pitch, 32);
+    usage.block_height = xe::round_up(usage.block_height, 32);
+
+    usage.pitch = usage.block_pitch * format_info->block_width;
+    usage.height = usage.block_height * format_info->block_height;
+
+    uint32_t bytes_per_block = format_info->bytes_per_block();
+    uint32_t byte_pitch = usage.block_pitch * bytes_per_block;
+
+    if (!is_tiled) {
+      // Each row must be a multiple of 256 bytes in linear textures.
+      byte_pitch = xe::round_up(byte_pitch, 256);
+      usage.block_pitch = byte_pitch / bytes_per_block;
+      usage.pitch = usage.block_pitch * format_info->block_width;
+    }
+
+    // Is depth special?
+    usage.depth = usage.depth;
+  }
+
+  return usage;
+}
+
+TextureMemoryUsage TextureMemoryUsage::Calculate(const FormatInfo* format_info,
+                                                 uint32_t pitch,
+                                                 uint32_t height,
+                                                 uint32_t depth, bool is_tiled,
+                                                 bool is_guest) {
+  return CalculateMemoryUsage(format_info, pitch, height, depth, is_tiled,
+                              is_guest);
+}
+
+TextureMemoryUsage TextureMemoryUsage::Calculate(const TextureInfo* info,
+                                                 bool is_guest) {
+  assert_not_null(info);
+  return CalculateMemoryUsage(info->format_info(), info->pitch,
+                              info->height + 1, info->depth + 1, info->is_tiled,
+                              is_guest);
+}
+
+}  //  namespace gpu
+}  //  namespace xe