From 5b7a312350531eb8a063b97bc251c1d5ea10d31b Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Mon, 17 Mar 2025 16:33:44 +0100
Subject: [PATCH] map: Added base map loader

---
 makefile           |   2 +-
 maps/base_room.s   | 114 ---------------------------------------------
 maps/default_map.s | 100 +++++++++++++++++++++++++++++++++++++++
 src/defs.s         |  25 +++++++---
 src/main.s         |   3 ++
 src/map.s          |  90 ++++++++++++++++++++++++++++++++++-
 src/ui.s           |   4 --
 src/wram.s         |   3 +-
 tools/tms2map.py   |   9 ++--
 9 files changed, 217 insertions(+), 133 deletions(-)
 delete mode 100644 maps/base_room.s
 create mode 100644 maps/default_map.s

diff --git a/makefile b/makefile
index bfe2c46..7a74e16 100644
--- a/makefile
+++ b/makefile
@@ -16,4 +16,4 @@ tiles:
 
 .PHONY: maps
 maps:
-	./tools/tms2map.py assets/maps/base.tmx base_room > maps/base_room.s
+	./tools/tms2map.py assets/maps/base.tmx default_map > maps/default_map.s
diff --git a/maps/base_room.s b/maps/base_room.s
deleted file mode 100644
index 2bb1628..0000000
--- a/maps/base_room.s
+++ /dev/null
@@ -1,114 +0,0 @@
-base_room_bg:
-
-.db 0x80, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24
-.db 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24
-.db 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24
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-.db 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x80
diff --git a/maps/default_map.s b/maps/default_map.s
new file mode 100644
index 0000000..f641440
--- /dev/null
+++ b/maps/default_map.s
@@ -0,0 +1,100 @@
+default_map_bg:
+
+.db 0x80, 0x0, 0x82, 0xff, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
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+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
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+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
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+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0xea
+.db 0xea, 0xea, 0xea, 0xea, 0xea, 0xea, 0x0, 0x80
diff --git a/src/defs.s b/src/defs.s
index a845223..c66ce0c 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -10,7 +10,7 @@
 #define STACK_BEGIN 0xDFFF
 
 #define TILE_SIZE 8
-#define MAP_W 32
+#define MAP_W 28
 #define MAP_H 28
 #define MAP_SIZE (MAP_W * MAP_H)
 
@@ -32,21 +32,32 @@
   ; this holds all the information 
   ; a cell on the map has 
 .se 0
+  ; cell type
 .de c_type, 1
+  ; cell gfx
 .de c_tile, 1
-.de c_flags, 2
+.de c_flags, 1
 
   ; power that this tile can pass on 
   ; to adjacent tiles
 .de c_power, 1
-.de c_crime, 1
-.de c_fire, 1
+  ; HI: fire chance 
+  ; LO: crime rate
+.de c_fire_crime, 1
 .de c_occupation, 1
-.de c_other, 2
+.de c_other, 1
   ; offset to head tile for thsi tile
   ; if offset is 0000 this is the head tile 
   ; head tiles are tiles that manage the state of a 
   ; multi-tile object
-  ; the head tile is located at c_type - [c_head_offset]
-.de c_head_offset, 2
+  ; the head offset consists of 2 4-bit integers
+  ; HI: how many cells up to walk to get to head
+  ; LO: how many cells left to walk to get to head
+.de c_head_offset, 1
 .de c_size, 0
+
+  ; cell type enum
+.se 0
+.de CT_NONE, 1
+.de CT_GROUND, 1
+.de CT_WATER, 1
diff --git a/src/main.s b/src/main.s
index 521400b..e4db461 100644
--- a/src/main.s
+++ b/src/main.s
@@ -22,6 +22,9 @@ entry:
   call lcd_off
   call video_init
   call audio_init
+  
+  call map_init
+
   call lcd_on
   call vblank_wait
   
diff --git a/src/map.s b/src/map.s
index 74f6337..885ab54 100644
--- a/src/map.s
+++ b/src/map.s
@@ -1 +1,89 @@
-#include "base_room.s"
+
+  ; initial map setup
+map_init:
+  ld hl, default_map_bg 
+  call tile_map_load
+
+  call cells_draw_all
+
+  ret
+
+  ; loads a tile map into cells 
+  ; and to cell memory
+  ; inputs:
+  ;   hl: map
+tile_map_load:
+  ; first clear 
+  push_all
+
+  ld hl, state_cells
+  ld bc,  state_cells_end - state_cells
+  ld d, 0
+  call memset
+
+  pop_all
+  
+  push hl
+  pop bc ; bc = map ptr
+
+  ; de = loop counter
+  ld de, MAP_SIZE
+  ; bc = destination
+  ld hl, state_cells
+  inc hl ; bc = c_tile  
+
+@loop:
+  ld a, [bc]
+  inc bc ; bc++
+  ld [hl], a
+
+  push de
+  ld de, c_size
+  add hl, de ; next cell
+  pop de
+
+  ; de--
+  dec de
+
+  ; check if de is 0
+  ld a, d
+  or a, e
+  cp a, 0
+  jr nz, @loop REL
+
+  ret
+
+  ; draws all cells currently loaded to the screen
+  ; only call during blank!
+cells_draw_all:
+
+  ; de = loop counter
+  ld de, MAP_SIZE
+  ld bc, SCRN0 
+
+  ld hl, state_cells
+  inc hl ; hl = c_type 
+
+@loop:
+  ld a, [hl] ; load tile
+  ld [bc], a ; draw
+  inc bc ; bc++
+
+  push de
+  ld de, c_size
+  add hl, de ; next cell
+  pop de
+
+  dec de ; de--
+
+  ; check if de is 0
+  ld a, d
+  or a, e
+  cp a, 0
+  jr nz, @loop REL
+
+  ret
+
+
+
+#include "default_map.s"
diff --git a/src/ui.s b/src/ui.s
index 34a9594..af904b5 100644
--- a/src/ui.s
+++ b/src/ui.s
@@ -7,9 +7,5 @@ ui_init:
   ; this should only be called 
   ; during blanking 
 ui_draw:
-  ; test draw to see tiles
-  ld a, 24
-  ld hl, SCRN0
-  ld [hl], a
 
   ret
diff --git a/src/wram.s b/src/wram.s
index 491afc9..4dc5326 100644
--- a/src/wram.s
+++ b/src/wram.s
@@ -39,6 +39,7 @@ demand_shop: .adv 1
 demand_factory: .adv 1
 population: .adv 3
 
-state_map: .adv c_size * MAP_SIZE
+state_cells: .adv c_size * MAP_SIZE
+state_cells_end:
 
 state_end:
diff --git a/tools/tms2map.py b/tools/tms2map.py
index 1c5e086..aefcf9b 100755
--- a/tools/tms2map.py
+++ b/tools/tms2map.py
@@ -27,11 +27,10 @@ def print_data(data, name, layer):
         val = int(byte)
         if val > 0:
             val -= 1
-        if layer == "bg":
-            og = val
-            val = 0x800 + ((val * 16) << 2)
-            val = (val & 0x0FF0) >> 4
-            val -= int(2 * og % 16)
+        if val > 127:
+            val = val - 128
+        else:
+            val = val + 0x80
         
         if (i+1) % 8 == 0:
             end = ''
-- 
2.30.2