update branches description

assets.md

@@ -22,7 +22,9 @@ PPM 8bits channels | In-game `RRRGGGBB` value | Name
 `0x00_00_00` | `000_000_00` | Black
 `0x00_00_FF` | `000_000_11` | Blue
 `0x00_FF_00` | `000_111_00` | Green
-`0x77_77_77` | `010_011_10` | Gray
+`0x99_50_00` | `010_001_00` | Brown
+`0x77_77_77` | `011_011_10` | Dark gray
+`0xB3_B3_B3` | `100_100_10` | Light gray
 `0xFF_00_00` | `111_000_00` | Red
 `0xFF_00_FF` | `111_000_11` | Pink
 `0xFF_80_00` | `111_100_00` | Orange

build.ts

@@ -9,42 +9,46 @@ if (Deno.args.length !== 0) {
 
 import { TextLineStream } from "jsr:@std/streams@1.1.0";
 
+const instructionLength = 4; // in bytes
+const mapWidth = 15;
+const spriteWidth = 17;
+
 const asmFilePaths = [
-  "src/consts/colors.asm",
+  "src/consts/arch.asm",
   "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",
 
+  "src/init.asm",
   "src/main.asm",
 
   "src/lib/game.asm",
   "src/lib/drawing.asm",
-  "src/lib/sprite_rotation.asm",
 ];
-
+const initialScreenPath = 'assets/screen.ppm';
-const mapWidth = 15;
+const reservedSpacePath = 'src/reserved_space.asm';
-const spriteWidth = 5;
 
 const mapMatchingStrings = {
-  0x00_00_00: 'U8 0', // Empty
+  0x00_00_00: '0', // Empty
-  0xFF_00_00: 'U8 1', // Wall
+  0xFF_00_00: '1', // Wall
-  0xFF_FF_00: 'U8 2', // Coin
+  0xFF_FF_00: '2', // Coin
 };
 
 const spritesMatchingStrings = {
-  0x00_00_00: 'U8 0b000_000_00',
+  0x00_00_00: '0b000_000_00',
-  0x00_00_FF: 'U8 0b000_000_11',
+  0x00_00_FF: '0b000_000_11',
-  0x00_FF_00: 'U8 0b000_111_00',
+  0x00_FF_00: '0b000_111_00',
-  0x77_77_77: 'U8 0b010_011_10',
+  0x99_50_00: `0b010_001_00`,
-  0xFF_00_00: 'U8 0b111_000_00',
+  0x77_77_77: '0b011_011_10',
-  0xFF_00_FF: 'U8 0b111_000_11',
+  0xB3_B3_B3: '0b100_100_10',
-  0xFF_80_00: 'U8 0b111_100_00',
+  0xFF_00_00: '0b111_000_00',
-  0xFF_FF_00: 'U8 0b111_110_00',
+  0xFF_00_FF: '0b111_000_11',
-  0xFF_FF_FF: 'U8 0b111_111_11',
+  0xFF_80_00: '0b111_100_00',
+  0xFF_FF_00: '0b111_110_00',
+  0xFF_FF_FF: '0b111_111_11',
 };
 
 const mapPath = 'assets/map.ppm';
@@ -85,17 +89,30 @@ for (const path of asmFilePaths) {
 const asmRawRepresentations = [];
 
 const mapBytes = await getDataFromPPM(mapPath);
-asmRawRepresentations.push(byteToAsmRawData('map', mapBytes, mapMatchingStrings, mapWidth));
+asmRawRepresentations.push(bytesToAsmConstU8('map', mapBytes, mapMatchingStrings, mapWidth));
 
 for (const [label, path] of Object.entries(spritesPath)) {
   const bytes = await getDataFromPPM(path);
-  asmRawRepresentations.push(byteToAsmRawData(label, bytes, spritesMatchingStrings, spriteWidth));
+  asmRawRepresentations.push(bytesToAsmConstU8(label, bytes, spritesMatchingStrings, spriteWidth));
 }
 
 console.log(asmRawRepresentations.join("\n\n"));
 
+console.log(`
+;
+; RESERVED RAM SPACE
+;
+`);
+
+const screenBytes = await getDataFromPPM(initialScreenPath);
+console.log(bytesToAsmConstU8('screen', screenBytes, spritesMatchingStrings, 1));
+
+console.log(await Deno.readTextFile(reservedSpacePath))
+
 /**
- * Return an ASM representation of the given data
+ * Return an ASM constant (U8) representation of the given data
+ * 
+ * If needed, the representation will be padded to ensure the following code stays aligned on the instruction's length
  * 
  * @param label The label to write before the first raw data
  * @param data An array of bytes to interprete as 24 bits values
@@ -104,14 +121,18 @@ console.log(asmRawRepresentations.join("\n\n"));
  * 
  * @returns The ASM representation of that raw data, pre- and post-fixed by the given label
  */
-function byteToAsmRawData(label: string, data: Uint8Array, matchingStrings: Record<number, string>, lineLength = 0): string {
+function bytesToAsmConstU8(label: string, data: Uint8Array, matchingStrings: Record<number, string>, lineLength = 0): string {
   lineLength ??= Infinity;
 
   const stringValues = [];
   for (let i = 0; i < data.length - 2; i += 3) {
     const pixelValue = (data[i] << 16) + (data[i+1] << 8) + (data[i+2])
+    if (!Object.hasOwn(matchingStrings, pixelValue)) {
+      console.error(`No matching value defined for "${pixelValue.toString(2)}" (which is ${label}'s ${i} pixel)`);
+      Deno.exit(1);
+    }
     
-    stringValues.push(matchingStrings[pixelValue]);
+    stringValues.push(`U8 ${matchingStrings[pixelValue]}`);
   }
 
   const lines = [];
@@ -123,9 +144,15 @@ function byteToAsmRawData(label: string, data: Uint8Array, matchingStrings: Reco
     }
   }
 
+  const paddingBytes = [];
+  for (let i = 0; i < stringValues.length % instructionLength; i++) {
+    paddingBytes.push('U8 0');
+  }
+  const paddingString = paddingBytes.length === 0 ? '' : `\n${paddingBytes.join('\t')} ; padding to preserve ${8 * instructionLength} bits alignment`
+  
   return `${label}:
 ${lines.join("\n")}
-${label}_end:`
+${label}_end:${paddingString}`
 }
 
 /**

readme.md

@@ -9,7 +9,14 @@ It thus should be able to run on the architecture and ISA the players have built
 The `main` branch contains a minimal implementation of the game.
 
 The following branches contains variations, allowing comparisons of performances, visuals, gameplay, ...
-- `res-2`: 256x192 screen resolution, 17x17 tile
+- `res-2`:
+  - `256x192` screen resolution
+  - `17x17` tile resolution
+- `res-2-prerendered`:
+  - `256x192` screen resolution
+  - `17x17` tile resolution
+  - initial screen prerendered
+  - no sprite rotation
 
 ## Build script
 
@@ -20,6 +27,9 @@ It also convert the PPM assets (map and sprites) into ASM raw values representat
 Usage example:
 ```sh
 ./build.ts > /path/to/the/game/schematics/architecture/Symfony/sandbox/main.asm
+
+# script output can easily be piped to strip it off all comments, leading whitespace and empty lines:
+./build.ts | sed 's/\s*;.*//' | sed 's/^\s*//' | sed '/^\d*$/d' > result.asm
 ```
 
 The script is build over Deno's API, so you'll need to have a `deno` binary in your PATH to use it that way.

src/consts/arch.asm

@@ -0,0 +1,2 @@
+pub const arch.instruction_size = 4
+pub const arch.instruction_increment_shift = 2

src/consts/colors.asm

@@ -1,9 +0,0 @@
-pub const colors.black =  0b000_000_00
-pub const colors.blue =   0b000_000_11
-pub const colors.green =  0b000_111_00
-pub const colors.gray =   0b010_011_10
-pub const colors.red =    0b111_000_00
-pub const colors.pink =   0b111_000_11
-pub const colors.orange = 0b111_100_00
-pub const colors.yellow = 0b111_110_00
-pub const colors.white =  0b111_111_11

src/consts/map.asm

@@ -1,4 +1,3 @@
-; map size 16x12 (or 15x11 with margins)
 pub const map.width = 15
 pub const map.height = 11
 pub const map.size = 165 ; 11*15

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/consts/scene.asm

@@ -1,8 +1,9 @@
 ; given:
-; - 16x12 tiles map
+; -> 256x192 pixels screen
-; - 5x5   pixels tile
+; -> 15x11   tiles map
+; => 17x17   pixels tile
 
 pub const scene.margin_top = 2
 pub const scene.margin_bottom = 3
-pub const scene.margin_left = 2
+pub const scene.margin_left = 0
-pub const scene.margin_right = 3
+pub const scene.margin_right = 1

src/consts/screen.asm

@@ -20,7 +20,7 @@ pub const screen.mode_index = 0
 pub const screen.mode_value = 2
 pub const screen.offset_index = 1
 pub const screen.resolution_index = 2
-pub const screen.resolution_value = 0
+pub const screen.resolution_value = 2
 
-pub const screen.width = 80
+pub const screen.width = 256
-pub const screen.height = 60
+pub const screen.height = 192

src/consts/sprites.asm

@@ -1,18 +1,10 @@
-pub const sprites.width = 5
+pub const sprites.width = 17
-pub const sprites.height = 5 ; unused as sprite are all square
+pub const sprites.height = 17 ; unused as sprite are all square
-pub const sprites.size = 25 ; height x width
+pub const sprites.size = 289 ; height x width
-
-pub const sprites.rotation_0 = 0
-pub const sprites.rotation_90 = 1
-pub const sprites.rotation_180 = 2
-pub const sprites.rotation_270 = 3
 
 pub const sprites.empty = 0
 pub const sprites.unimplemented = 1
-pub const sprites.wall_end = 2
+pub const sprites.robot = 2
-pub const sprites.wall_straight = 3
+pub const sprites.ghost = 3
-pub const sprites.wall_corner = 4
+pub const sprites.coin = 4
-pub const sprites.robot = 5
+pub const sprites.max = 4 ; for lookup table
-pub const sprites.ghost = 6
-pub const sprites.coin = 7
-pub const sprites.max = 7 ; for lookup table

src/init.asm

@@ -0,0 +1,52 @@
+;
+;   Jump table initialisation
+;
+; r1: sprite id
+; r2: pointer address
+; r3: pointer value
+
+; sprite_empty
+add r1, zr, sprites.empty
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_empty
+store_32 [r2], r3
+; sprite_unimplemented
+add r1, zr, sprites.unimplemented
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_unimplemented
+store_32 [r2], r3
+; sprite_robot
+add r1, zr, sprites.robot
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_robot
+store_32 [r2], r3
+; sprite_ghost
+add r1, zr, sprites.ghost
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_ghost
+store_32 [r2], r3
+; sprite_coin
+add r1, zr, sprites.coin
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_coin
+store_32 [r2], r3
+
+;
+;   Screen initialization
+;
+
+; r1 = screen parameter value
+mov r1, screen.mode_index
+screen r1, screen.mode_value
+
+mov r1, screen.offset_index
+add r2, zr, screen
+screen r1, r2
+
+mov r1, screen.resolution_index
+screen r1, screen.resolution_value

src/lib/drawing.asm

@@ -5,53 +5,6 @@ include ../consts/scene
 include ../consts/sprites
 include sprite_rotation
 
-; /* Draw the whole (fill the screen memory with the values of the sprites based on the map)
-
-; Inputs:
-
-; Outputs:
-
-; Locals:
-; 	r1: x map coord
-; 	r2: y map coord
-; 	r3: sprite rotation
-; 	r4: sprite id
-; 	r12: rotation (returned by `sprite and rotation`)
-; 	r13: sprite (returned by `get_sprite_id_and_rotation`)
-; */
-pub drawing.draw_whole_map:
-    push r1
-    push r2
-    push r3
-    push r4
-    push r12
-    push r13
-
-    mov r1, 0
-    mov r2, 0
-
-    draw_whole_map_loop:
-        call sprite_rotation.get_sprite_id_and_rotation
-        mov r3, r12
-        mov r4, r13
-        call drawing.draw_sprite_at_map_coord
-        add r1, r1, 1
-        cmp r1, map.width
-        jne draw_whole_map_loop
-        mov r1, 0
-        add r2, r2, 1
-        cmp r2, map.height
-        jne draw_whole_map_loop
-
-    pop r13
-    pop r12
-    pop r4
-    pop r3
-    pop r2
-    pop r1
-
-    ret
-
 ; /* Return the top-left pixel address of the tile at the given map coordinates
 
 ; Inputs:
@@ -77,7 +30,7 @@ get_tile_address:
 		cmp r3, sprites.height
 		jne get_tile_address_offset_per_row_loop
 
-	mov r13, offsets.screen
+	add r13, zr, screen
 
 	mov r3, 0
 	get_tile_address_margin_top_loop:
@@ -120,48 +73,21 @@ get_tile_address:
 ; 	r13: address
 
 ; Locals:
-;		r2: jump address
+;		r2: pointer address
 ; */
 get_sprite_address:
 	push r1
 	push r2
 
 	cmp r1, sprites.max
-	jbe get_sprite_address_jmp_table_init
+	jbe get_sprite_address_ptr
 	mov r1, sprites.unimplemented
 
-	get_sprite_address_jmp_table_init:
+	get_sprite_address_ptr:
-	lsl r2, r1, 3 ; 2*instruction_size = *8 = <<3
+	lsl r2, r1, arch.instruction_increment_shift
-	add r2, r2, get_sprite_address_jmp_table_start
+	add r2, r2, ptr.textures_addresses
-	jmp r2
+	load_32 r13, [r2]
 
-	get_sprite_address_jmp_table_start:
-	; sprite_empty
-	add r13, zr, sprite_empty
-	jmp get_sprite_address_return
-	; sprite_unimplemented:
-	add r13, zr, sprite_unimplemented
-	jmp get_sprite_address_return
-	; sprite_wall_end
-	add r13, zr, sprite_wall_end
-	jmp get_sprite_address_return
-	; sprite_wall_straight
-	add r13, zr, sprite_wall_straight
-	jmp get_sprite_address_return
-	; sprite_wall_corner
-	add r13, zr, sprite_wall_corner
-	jmp get_sprite_address_return
-	; sprite_robot
-	add r13, zr, sprite_robot
-	jmp get_sprite_address_return
-	; sprite_ghost
-	add r13, zr, sprite_ghost
-	jmp get_sprite_address_return
-	; sprite_coin:
-	add r13, zr, sprite_coin
-	;jmp get_sprite_address_return
-
-	get_sprite_address_return:
 	pop r2
 	pop r1
 	ret
@@ -171,8 +97,7 @@ get_sprite_address:
 ; Inputs:
 ; 	r1: map x coord
 ; 	r2: map y coord
-; 	r3: sprite rotation
+; 	r3: sprite id
-; 	r4: sprite id
 
 ; Outputs:
 
@@ -185,22 +110,20 @@ pub drawing.draw_sprite_at_map_coord:
 	push r1
 	push r2
 	push r3
-	push r4
 	push r13
 
 	call get_tile_address
-	mov r1, r13
+	push r13
-	push r1
 	
-	mov r1, r4
+	mov r1, r3
 	call get_sprite_address
-	mov r2, r13
-	pop r1
 
+	mov r2, r13
+	pop r13
+	mov r1, r13
 	call draw_sprite
 
 	pop r13
-	pop r4
 	pop r3
 	pop r2
 	pop r1
@@ -211,18 +134,15 @@ pub drawing.draw_sprite_at_map_coord:
 ; Inputs:
 ; 	r1: screen address
 ; 	r2: sprite address
-; 	r3: rotation
 
 ; Outputs:
 
 ; Locals:
 ; 	r1: current screen pixel address
-; 	r4: x
+;		r2: current sprite pixel address
-; 	r5: y
+; 	r3: x
-; 	r6: current sprite pixel address
+; 	r4: color
-; 	r7: color
+;		r5: sprite last pixel address + 1
-; 	r8: x increment
-; 	r9: y increment
 ; */
 draw_sprite:
 	push r1
@@ -230,67 +150,25 @@ draw_sprite:
 	push r3
 	push r4
 	push r5
-	push r6
-	push r7
-	push r8
-	push r9
 	
-	mov r6, r2
+	add r5, r2, sprites.size
 
-	; rotation
+	mov r3, 0
-	draw_sprite_cmp_rotation_0:
-		cmp r3, sprites.rotation_0
-		jne draw_sprite_cmp_rotation_90
-		mov r8, 1
-		mov r9, 0
-		jmp draw_sprite_loop_init
-	draw_sprite_cmp_rotation_90:
-		cmp r3, sprites.rotation_90
-		jne draw_sprite_cmp_rotation_180
-		add r6, r6, sprites.size
-		sub r6, r6, sprites.width
-		sub r8, zr, sprites.width
-		mov r9, sprites.size
-		add r9, r9, 1
-		jmp draw_sprite_loop_init
-	draw_sprite_cmp_rotation_180:
-		cmp r3, sprites.rotation_180
-		jne draw_sprite_cmp_rotation_270
-		add r6, r6, sprites.size
-		sub r6, r6, 1
-		sub r8, zr, 1
-		mov r9, 0
-		jmp draw_sprite_loop_init
-	draw_sprite_cmp_rotation_270:
-		add r6, r6, sprites.width
-		sub r6, r6, 1
-		mov r8, sprites.width
-		sub r9, zr, sprites.size
-		sub r9, r9, 1
-	
-	draw_sprite_loop_init:
-	mov r4, 0
-	mov r5, 0
 	draw_sprite_loop:
-		load_8 r7, [r6]
+		load_8 r4, [r2]
-		store_8 [r1], r7
+		store_8 [r1], r4
-		add r4, r4, 1
+
 		add r1, r1, 1
-		add r6, r6, r8
+		add r2, r2, 1
-		cmp r4, sprites.width
+		add r3, r3, 1
+		cmp r3, sprites.width
 		jne draw_sprite_loop
-		mov r4, 0
+		mov r3, 0
-		add r6, r6, r9
 		add r1, r1, screen.width
 		sub r1, r1, sprites.width
-		add r5, r5, 1
+		cmp r5, r2
-		cmp r5, sprites.width
 		jne draw_sprite_loop
 		
-	pop r9
-	pop r8
-	pop r7
-	pop r6
 	pop r5
 	pop r4
 	pop r3

src/lib/sprite_rotation.asm

@@ -1,171 +0,0 @@
-include ../consts/offsets
-include ../consts/map
-include ../consts/sprites
-
-; /* Return the sprite id and rotation for the given map coordinates
-
-; Inputs:
-;     r1: x map coord
-;     r2: y map coord
-
-; Outputs:
-;     r12: sprite rotation
-;     r13: sprite id
-
-; Locals:
-;     r3: tile id
-;     r4: map offset
-;     r5: counter
-;     r6: left tile id
-;     r7: up tile id
-;     r8: right tile id
-;     r9: down tile id
-; */
-pub sprite_rotation.get_sprite_id_and_rotation:
-    push r1
-    push r2
-    push r3
-    push r4
-    push r5
-    push r6
-    push r7
-    push r8
-    push r9
-
-    add r4, r1, map
-    mov r5, 0
-    get_sprite_id_and_rotation_map_row_loop:
-        cmp r5, r2
-        je get_sprite_id_and_rotation_map_row_loop_end
-        add r4, r4, map.width
-        add r5, r5, 1
-        jmp get_sprite_id_and_rotation_map_row_loop
-    get_sprite_id_and_rotation_map_row_loop_end:
-
-    mov r12, sprites.rotation_0 ; default rotation
-
-    load_8 r3, [r4]
-    lsl r3, r3, 3 ; 2*instruction_size = *8 = <<3
-    add r3, r3, get_sprite_id_and_rotation_jump_table
-    jmp r3
-
-    get_sprite_id_and_rotation_jump_table:
-    ; tile_empty
-    mov r13, sprites.empty
-    jmp get_sprite_id_and_rotation_return
-    ; tiles_wall
-    jmp get_sprite_id_and_rotation_wall
-    nop
-    ; tile_coin
-    mov r13, sprites.coin
-    jmp get_sprite_id_and_rotation_return
-
-    get_sprite_id_and_rotation_wall:
-    mov r6, 0
-    mov r7, 0
-    mov r8, 0
-    mov r9, 0
-    
-    get_sprite_id_and_rotation_cmp_left:
-        cmp r1, 0
-        je get_sprite_id_and_rotation_cmp_up
-        sub r4, r4, 1
-        load_8 r6, [r4]
-        add r4, r4, 1
-    get_sprite_id_and_rotation_cmp_up:
-        cmp r2, 0
-        je get_sprite_id_and_rotation_cmp_right
-        sub r4, r4, map.width
-        load_8 r7, [r4]
-        add r4, r4, map.width
-    get_sprite_id_and_rotation_cmp_right:
-        cmp r1, map.max_x
-        je get_sprite_id_and_rotation_cmp_down
-        add r4, r4, 1
-        load_8 r8, [r4]
-        sub r4, r4, 1
-    get_sprite_id_and_rotation_cmp_down:
-        cmp r2, map.max_y
-        je get_sprite_id_and_rotation_check_connections
-        add r4, r4, map.width
-        load_8 r9, [r4]
-        sub r4, r4, map.width
-
-    get_sprite_id_and_rotation_check_connections:
-    get_sprite_id_and_rotation_straight_0:
-        cmp r7, map.tiles.wall
-        jne get_sprite_id_and_rotation_straight_90
-        cmp r9, map.tiles.wall
-        jne get_sprite_id_and_rotation_straight_90
-        mov r12, sprites.rotation_0
-        mov r13, sprites.wall_straight
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_straight_90:
-        cmp r6, map.tiles.wall
-        jne get_sprite_id_and_rotation_corner_0
-        cmp r8, map.tiles.wall
-        jne get_sprite_id_and_rotation_corner_0
-        mov r12, sprites.rotation_90
-        mov r13, sprites.wall_straight
-        jmp get_sprite_id_and_rotation_return
-
-    get_sprite_id_and_rotation_corner_0:
-        cmp r6, map.tiles.wall
-        jne get_sprite_id_and_rotation_corner_180
-        cmp r9, map.tiles.wall
-        jne get_sprite_id_and_rotation_corner_90
-        mov r12,sprites.rotation_0
-        mov r13, sprites.wall_corner
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_corner_90:
-        cmp r7, map.tiles.wall
-        jne get_sprite_id_and_rotation_end_90
-        mov r12,sprites.rotation_90
-        mov r13, sprites.wall_corner
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_corner_180:
-        cmp r8, map.tiles.wall
-        jne get_sprite_id_and_rotation_end_0
-        cmp r7, map.tiles.wall
-        jne get_sprite_id_and_rotation_corner_270
-        mov r12,sprites.rotation_180
-        mov r13, sprites.wall_corner
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_corner_270:
-        cmp r9, map.tiles.wall
-        jne get_sprite_id_and_rotation_end_270
-        mov r12,sprites.rotation_270
-        mov r13, sprites.wall_corner
-        jmp get_sprite_id_and_rotation_return
-
-    get_sprite_id_and_rotation_end_0:
-        cmp r9, map.tiles.wall
-        jne get_sprite_id_and_rotation_end_180
-        mov r12,sprites.rotation_0
-        mov r13, sprites.wall_end
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_end_90:
-        mov r12,sprites.rotation_90
-        mov r13, sprites.wall_end
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_end_180:
-        mov r12,sprites.rotation_180
-        mov r13, sprites.wall_end
-        jmp get_sprite_id_and_rotation_return
-    get_sprite_id_and_rotation_end_270:
-        mov r12,sprites.rotation_270
-        mov r13, sprites.wall_end
-        ;jmp get_sprite_id_and_rotation_return
-
-    get_sprite_id_and_rotation_return:
-    pop r9
-    pop r8
-    pop r7
-    pop r6
-    pop r5
-    pop r4
-    pop r3
-    pop r2
-    pop r1
-
-    ret

src/main.asm

@@ -1,20 +1,6 @@
 include consts/screen
 
-;
+include init
-;   Screen initialization
-;
-
-; r1 = screen parameter value
-mov r1, screen.mode_index
-screen r1, screen.mode_value
-
-mov r1, screen.offset_index
-screen r1, offsets.screen
-
-mov r1, screen.resolution_index
-screen r1, screen.resolution_value
-
-call drawing.draw_whole_map
 
 ;
 ;   State initialization
@@ -27,15 +13,14 @@ 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
 add r6, r6, 1
 store_8 [r6], r5
 
-mov r3, sprites.rotation_0
+mov r3, sprites.robot
-mov r4, sprites.robot
 call drawing.draw_sprite_at_map_coord
 
 ; Ghost
@@ -46,31 +31,23 @@ 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
 add r6, r6, 1
 store_8 [r6], r5
 
-mov r3, sprites.rotation_0
+mov r3, sprites.ghost
-mov r4, sprites.ghost
 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 +58,9 @@ 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 +102,7 @@ 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 +120,9 @@ 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 +132,9 @@ 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 +143,9 @@ 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 +161,7 @@ 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 +206,7 @@ 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 +217,7 @@ 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
@@ -248,15 +225,13 @@ game_loop:
     ; clear old position
     mov r1, r2
     mov r2, r3
-    mov r3, sprites.rotation_0
+    mov r3, sprites.empty
-    mov r4, sprites.empty
     call drawing.draw_sprite_at_map_coord
 
     ; draw robot on new position
     mov r1, r5
     mov r2, r6
-    mov r3, sprites.rotation_0
+    mov r3, sprites.robot
-    mov r4, sprites.robot
     call drawing.draw_sprite_at_map_coord
 
 
@@ -276,7 +251,7 @@ 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]
@@ -308,40 +283,33 @@ 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
 
     ; get tile at previous position
-    push r2
     mov r1, r2
     mov r2, r3
     call game.get_tile_address_from_map_coord
-    mov r9, r13
+    load_8 r13, [r13]
-    pop r2
 
     ; draw tile at previous position
-    load_8 r1, [r9]
+    cmp r13, map.tiles.coin
-    cmp r1, map.tiles.coin
     je game_loop_ghost_movement_old_tile_coin
     ; old tile empty
-    mov r4, sprites.empty
+    mov r3, sprites.empty
     jmp game_loop_ghost_movement_draw_old_tile
     game_loop_ghost_movement_old_tile_coin:
-    mov r4, sprites.coin
+    mov r3, sprites.coin
 
     game_loop_ghost_movement_draw_old_tile:
-    mov r1, r2
-    mov r2, r3
-    mov r3, sprites.rotation_0
     call drawing.draw_sprite_at_map_coord
 
     ; draw ghost on new position
     mov r1, r7
     mov r2, r8
-    mov r3, sprites.rotation_0
+    mov r3, sprites.ghost
-    mov r4, sprites.ghost
     call drawing.draw_sprite_at_map_coord
 
     ;
@@ -355,7 +323,7 @@ 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 +1,30 @@
+; Sprite addresses jump table
+pub ptr.textures_addresses:
+U32 0 ; empty
+U32 0 ; placeholder
+U32 0 ; robot
+U32 0 ; ghost
+U32 0 ; coin
+
+; 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
+U8 0 ; [padding]
+
+pub ptr.state_ghost:
+U8 0 ; x coord
+U8 0 ; y coord
+U8 0 ; direction
+U8 0 ; [padding]

visuals.md

@@ -23,4 +23,4 @@ Resolution ID | Tile size (in pixels) | Comment
 -- | -- | --
 `0` | `5x5` | with a reminder of 5 pixels en width and 5 pixels in height.
 `1` | `10x10` | with a reminder of 10w and 10h
-`2` | `17x17` | no reminder
+`2` | `17x17` | with a reminder of 1w and 5h