change the way static RAM variable are declared and used

build.ts

@@ -13,7 +13,6 @@ const asmFilePaths = [
   "src/consts/game.asm",
   "src/consts/keyboard.asm",
   "src/consts/map.asm",
-  "src/consts/offsets.asm",
   "src/consts/scene.asm",
   "src/consts/screen.asm",
   "src/consts/sprites.asm",
@@ -24,6 +23,7 @@ const asmFilePaths = [
   "src/lib/drawing.asm",
   "src/lib/sprite_rotation.asm",
 ];
+const reservedSpacePath = 'src/reserved_space.asm';
 
 const mapWidth = 15;
 const spriteWidth = 17;
@@ -93,6 +93,14 @@ for (const [label, path] of Object.entries(spritesPath)) {
 
 console.log(asmRawRepresentations.join("\n\n"));
 
+console.log(`
+;
+; RESERVED RAM SPACE
+;
+`);
+
+console.log(await Deno.readTextFile(reservedSpacePath))
+
 /**
  * Return an ASM representation of the given data
  * 

src/consts/offsets.asm

@@ -1,16 +0,0 @@
-;const free_ram_start = 8000
-
-pub const offsets.screen = 8000 ; screen size: 80x60 = 4800
-
-pub const offsets.tick_duration_high = 12800
-pub const offsets.tick_duration_low = 12804
-pub const offsets.next_tick_high = 12808
-pub const offsets.next_tick_low = 128012
-
-
-; State:
-; U8 x coord
-; U8 y coord
-; U8 direction
-pub const offsets.state_robot = 12816
-pub const offsets.state_ghost = 12819

src/lib/drawing.asm

@@ -77,7 +77,7 @@ get_tile_address:
 		cmp r3, sprites.height
 		jne get_tile_address_offset_per_row_loop
 
-	mov r13, offsets.screen
+	add r13, zr, ptr.screen
 
 	mov r3, 0
 	get_tile_address_margin_top_loop:

src/main.asm

@@ -9,7 +9,8 @@ mov r1, screen.mode_index
 screen r1, screen.mode_value
 
 mov r1, screen.offset_index
-screen r1, offsets.screen
+add r2, zr, ptr.screen
+screen r1, r2
 
 mov r1, screen.resolution_index
 screen r1, screen.resolution_value
@@ -27,7 +28,7 @@ const robot_initial_direction = game.direction_down
 mov r1, robot_initial_x
 mov r2, robot_initial_y
 mov r5, robot_initial_direction
-mov r6, offsets.state_robot
+add r6, zr, ptr.state_robot
 store_8 [r6], r1
 add r6, r6, 1
 store_8 [r6], r2
@@ -46,7 +47,7 @@ const ghost_initial_direction = game.direction_down
 mov r1, ghost_initial_x
 mov r2, ghost_initial_y
 mov r5, ghost_initial_direction
-mov r6, offsets.state_ghost
+add r6, zr, ptr.state_ghost
 store_8 [r6], r1
 add r6, r6, 1
 store_8 [r6], r2
@@ -60,17 +61,10 @@ call drawing.draw_sprite_at_map_coord
 ;
 ;   Time initialization
 ;
-mov r2, game.tick_duration_1
+add r1, zr, ptr.tick_duration_low
-movt r2, r2
+load_32 r2, [r1]
-movb r2, game.tick_duration_0
+add r1, zr, ptr.tick_duration_high
-mov r1, offsets.tick_duration_low
+load_32 r3, [r1]
-store_32 [r1], r2
-
-mov r3, game.tick_duration_3
-movt r3, r3
-movb r3, game.tick_duration_2
-mov r1, offsets.tick_duration_high
-store_32 [r1], r3
 
 time_0 r4
 time_1 r5
@@ -81,9 +75,9 @@ jae init_store_next_tick
 add r5, r5, 1 ; overflow
 
 init_store_next_tick:
-mov r1, offsets.next_tick_low
+add r1, zr, ptr.next_tick_low
 store_32 [r1], r4
-mov r1, offsets.next_tick_high
+add r1, zr, ptr.next_tick_high
 store_32 [r1], r5
 
 game_loop:
@@ -125,7 +119,7 @@ game_loop:
 ;    jmp game_loop_event_handling_end
 
     game_loop_event_handling_store_direction:
-    add r2, zr, offsets.state_robot
+    add r2, zr, ptr.state_robot
     add r2, r2, 2
     store_8 [r2], r1
 
@@ -143,9 +137,9 @@ game_loop:
     time_0 r2
     time_1 r3
 
-    mov r1, offsets.next_tick_low
+    add r1, zr, ptr.next_tick_low
     load_32 r4, [r1]
-    mov r1, offsets.next_tick_high
+    add r1, zr, ptr.next_tick_high
     load_32 r5, [r1]
 
     cmp r3, r5
@@ -155,9 +149,9 @@ game_loop:
     jb game_loop
 
     update_next_tick:
-    mov r1, offsets.tick_duration_low
+    add r1, zr, ptr.tick_duration_low
     load_32 r2, [r1]
-    mov r1, offsets.tick_duration_high
+    add r1, zr, ptr.tick_duration_high
     load_32 r3, [r1]
     add r4, r4, r2
     add r5, r5, r3
@@ -166,9 +160,9 @@ game_loop:
     add r5, r5, 1
 
     store_next_tick:
-    mov r1, offsets.next_tick_low
+    add r1, zr, ptr.next_tick_low
     store_32 [r1], r4
-    mov r1, offsets.next_tick_high
+    add r1, zr, ptr.next_tick_high
     store_32 [r1], r5
 
 
@@ -184,7 +178,7 @@ game_loop:
     ; r7 = new position address
     ; r8 = new position content
     ; r9 = jump address
-    mov r1, offsets.state_robot
+    add r1, zr, ptr.state_robot
     load_8 r2, [r1]
     add r1, r1, 1
     load_8 r3, [r1]
@@ -229,7 +223,7 @@ game_loop:
     cmp r8, map.tiles.wall
     jne game_loop_robot_movement_some
     ; hit wall
-    mov r1, offsets.state_robot
+    add r1, zr, ptr.state_robot
     add r1, r1, 2
     mov r4, game.direction_still
     store_8 [r1], r4
@@ -240,7 +234,7 @@ game_loop:
     mov r8, map.tiles.empty
     store_8 [r7], r8
 
-    mov r1, offsets.state_robot
+    add r1, zr, ptr.state_robot
     store_8 [r1], r5
     add r1, r1, 1
     store_8 [r1], r6
@@ -276,7 +270,7 @@ game_loop:
     ; r9: new position address
     ; r10: new position content
     ; r11: jump address
-    mov r1, offsets.state_ghost
+    add r1, zr, ptr.state_ghost
     load_8 r2, [r1]
     add r1, r1, 1
     load_8 r3, [r1]
@@ -308,7 +302,7 @@ game_loop:
     game_loop_ghost_movement_make_move:
     add r7, r2, r5
     add r8, r3, r6
-    mov r1, offsets.state_ghost
+    add r1, zr, ptr.state_ghost
     store_8 [r1], r7
     add r1, r1, 1
     store_8 [r1], r8
@@ -355,7 +349,7 @@ game_loop:
     cmp r10, map.tiles.wall
     jne game_loop_ghost_movement_end
     ; increment direction
-    mov r1, offsets.state_ghost
+    add r1, zr, ptr.state_ghost
     add r1, r1, 2
     load_8 r4, [r1]
     add r4, r4, 1

src/reserved_space.asm

@@ -0,0 +1,22 @@
+; 0.5 second = 500_000_000 nano second = 0x0000_0000_1DCD_6500
+pub ptr.tick_duration_high: U32 0x0000_0000
+pub ptr.tick_duration_low:  U32 0x1DCD_6500
+
+; 1 second = 1_000_000_000 nano second = 0x0000_0000_3B9A_CA00
+; pub ptr.tick_duration_high: U32 0x0000_0000
+; pub ptr.tick_duration_low:  U32 0x3B9A_CA00
+
+pub ptr.next_tick_high: U32 0
+pub ptr.next_tick_low: U32 0
+
+pub ptr.state_robot:
+U8 0 ; x coord
+U8 0 ; y coord
+U8 0 ; direction
+
+pub ptr.state_ghost:
+U8 0 ; x coord
+U8 0 ; y coord
+U8 0 ; direction
+
+pub ptr.screen: