Add WIP lua script to display currently loaded GFX in DoS

lua_scripts/display_loaded_gfx.lua

@@ -0,0 +1,83 @@
+
+-- currently supports: US DoS
+
+ASSET_LIST_START = 0x0208CC6C
+ASSET_LIST_END = 0x0209A0C3
+LOADED_GFX_ASSETS_LIST_START = 0x020C7460
+LOADED_GFX_ASSETS_LIST_END = 0x020C76DF
+
+asset_ptr_to_asset_filename = {}
+entry_ptr = ASSET_LIST_START
+i = 0
+while entry_ptr < ASSET_LIST_END do
+  asset_index = i
+  asset_ptr = memory.readdwordsigned(entry_ptr+0x00)
+  asset_filename = ""
+  chars = {}
+  for i, byte in ipairs(memory.readbyterange(entry_ptr+0x06, 0x1A)) do
+    if byte == 0 then
+      break
+    end
+    asset_filename = asset_filename .. string.char(byte)
+  end
+  if asset_ptr ~= 0 then
+    asset_ptr_to_asset_filename[asset_ptr] = asset_filename
+  end
+
+  entry_ptr = entry_ptr + 0x28
+  i = i + 1
+end
+
+local function display_hitboxes()
+  entry_ptr = LOADED_GFX_ASSETS_LIST_START
+  i = 0
+  gfx_lists_by_index = {}
+  while entry_ptr < LOADED_GFX_ASSETS_LIST_END do
+    index_of_parent_entry = memory.readdwordsigned(entry_ptr+0x04)
+    gfx_load_type = memory.readbytesigned(entry_ptr+0x0A)
+    unk_0d = memory.readbytesigned(entry_ptr+0x0D)
+    data_ptr = memory.readdwordsigned(entry_ptr+0x10)
+
+    if index_of_parent_entry == -1 then
+      display_str = "(empty)"
+    elseif index_of_parent_entry ~= i then
+      num_entries_up_to_parent = (i - index_of_parent_entry)
+      if gfx_lists_by_index[index_of_parent_entry] == nil then
+        -- todo ?????
+        display_str = string.format("(^%d)", num_entries_up_to_parent)
+      else
+        gfx_asset_ptr = gfx_lists_by_index[index_of_parent_entry][num_entries_up_to_parent]
+        display_str = "^ " .. asset_ptr_to_asset_filename[gfx_asset_ptr]
+      end
+    elseif gfx_load_type == 0 then -- Single GFX
+      display_str = asset_ptr_to_asset_filename[data_ptr]
+    elseif gfx_load_type == 1 then -- Multi GFX list loaded simultaneously
+      num_gfx_pages_in_list = memory.readbytesigned(data_ptr+0x02)
+      gfx_list_ptr = memory.readdwordsigned(data_ptr+0x04)
+      list_entry_index = 0
+      gfx_lists_by_index[i] = {}
+      while list_entry_index < num_gfx_pages_in_list do
+        gfx_asset_ptr = memory.readdwordsigned(gfx_list_ptr + list_entry_index*4)
+        gfx_lists_by_index[i][list_entry_index] = gfx_asset_ptr
+        list_entry_index = list_entry_index + 1
+      end
+
+      --display_str = string.format("List: %08X", data_ptr)
+      first_gfx_asset_ptr = gfx_lists_by_index[i][0]
+      display_str = string.format("V " .. asset_ptr_to_asset_filename[first_gfx_asset_ptr])
+    else
+      -- todo handle player gfx that swap out somehow
+      display_str = string.format("Unknown: %08X", data_ptr)
+    end
+    display_str = display_str .. " " .. unk_0d -- string.format(" %d", unk_0d)
+
+    x = math.floor(i / 16) * 126
+    y = 1 + (i%16)*10
+    gui.text(x, y, display_str)
+
+    entry_ptr = entry_ptr + 0x14
+    i = i + 1
+  end
+end
+
+gui.register(display_hitboxes)