offset ghost first movement time

(cherry picked from commit f0b43f7b7c)

.gitignore

@@ -0,0 +1 @@
+dist/

build.ts

@@ -1,229 +1,268 @@
-#!/usr/bin/env -S deno run --allow-read
-
-if (Deno.args.length !== 0) {
-  console.error(
-    "This script takes no argument (The source file list is hardcoded) and output the result on stdout.",
-  );
-  Deno.exit(1);
-}
+#!/usr/bin/env -S deno run --allow-read --allow-write --allow-run
 
 import { TextLineStream } from "jsr:@std/streams@1.1.0";
 
-const asmFilePaths = [
-  "src/consts/arch.asm",
-  "src/consts/game.asm",
-  "src/consts/keyboard.asm",
-  "src/consts/map.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 reservedSpacePath = 'src/reserved_space.asm';
+/**
+ *  CONFIG
+ */
 
 const instructionLength = 4; // in bytes
-const mapWidth = 15;
-const spriteWidth = 5;
+const rawDataInstructionLengthPrefix = "U32";
 
-const mapMatchingStrings = {
-  0x00_00_00: '0', // Empty
-  0xFF_00_00: '1', // Wall
-  0xFF_FF_00: '2', // Coin
-};
+const ppmToAsmScriptPath = "./ppmToAsm.ts";
 
-const spritesMatchingStrings = {
-  0x00_00_00: '  0', // 0b000_000_00
-  0x00_00_FF: '  3', // 0b000_000_11
-  0x00_FF_00: ' 28', // 0b000_111_00
-  0x99_50_00: ' 68', // 0b010_001_00
-  0x77_77_77: '110', // 0b011_011_10
-  0xB3_B3_B3: '146', // 0b100_100_10
-  0xFF_00_00: '224', // 0b111_000_00
-  0xFF_00_FF: '227', // 0b111_000_11
-  0xFF_80_00: '240', // 0b111_100_00
-  0xFF_FF_00: '248', // 0b111_110_00
-  0xFF_FF_FF: '255', // 0b111_111_11
-};
-
-const mapPath = 'assets/map.ppm';
+const mapPath = "assets/map.ppm";
 const spritesPath = {
-  'sprite_empty': 'assets/sprites/empty.ppm',
-  'sprite_unimplemented': 'assets/sprites/placeholder.ppm',
-  'sprite_wall_end': 'assets/sprites/wall_end.ppm',
-  'sprite_wall_straight': 'assets/sprites/wall_straight.ppm',
-  'sprite_wall_corner': 'assets/sprites/wall_corner.ppm',
-  'sprite_robot': 'assets/sprites/robot.ppm',
-  'sprite_ghost': 'assets/sprites/ghost.ppm',
-  'sprite_coin': 'assets/sprites/coin.ppm',
+  "sprite_empty": "assets/sprites/empty.ppm",
+  "sprite_unimplemented": "assets/sprites/placeholder.ppm",
+  "sprite_wall_end": "assets/sprites/wall_end.ppm",
+  "sprite_wall_straight": "assets/sprites/wall_straight.ppm",
+  "sprite_wall_corner": "assets/sprites/wall_corner.ppm",
+  "sprite_robot_up": "assets/sprites/robot_up.ppm",
+  "sprite_robot_right": "assets/sprites/robot_right.ppm",
+  "sprite_robot_down": "assets/sprites/robot_down.ppm",
+  "sprite_robot_left": "assets/sprites/robot_left.ppm",
+  "sprite_ghost_up": "assets/sprites/ghost_up.ppm",
+  "sprite_ghost_right": "assets/sprites/ghost_right.ppm",
+  "sprite_ghost_down": "assets/sprites/ghost_down.ppm",
+  "sprite_ghost_left": "assets/sprites/ghost_left.ppm",
+  "sprite_coin": "assets/sprites/coin.ppm",
 };
 
 /**
- *    START OF BUILD
+ *  END OF CONFIG
  */
 
-for (const path of asmFilePaths) {
-  const file = await Deno.open(path);
-  const readable = file.readable.pipeThrough(new TextDecoderStream())
-    .pipeThrough(new TextLineStream());
+class Minifier {
+  private buffer = "";
+  private lines: Array<string> = [];
+  private insideComment = false;
+  stream;
 
-  console.log(`
-;/*******************************
-;* ${path}
-;*******************************/
-`);
+  constructor(writableStream: WritableStream) {
+    this.stream = new TransformStream<string>({
+      transform: (chunk, controller) => {
+        this.buffer += chunk;
+        controller.enqueue(this.processChunk());
+      },
 
-  for await (const line of readable) {
-    if (!line.startsWith("include ")) {
-      console.log(line);
+      flush: (controller) => {
+        this.buffer += "\n";
+        controller.enqueue(this.processChunk());
+        controller.enqueue(this.lines.join("\n") + "\n");
+        this.lines = [];
+      },
+    });
+
+    this.stream.readable.pipeTo(writableStream);
   }
+
+  private processChunk(): string {
+    const commentFullRegex = /\/\*.*\*\//;
+    const commentStartRegex = /(.*)\/\*(.*)/;
+    const commentEndRegex = /(.*)\*\/(.*)/;
+
+    if (this.insideComment) {
+      const matches = this.buffer.match(commentEndRegex);
+      if (matches === null) {
+        this.buffer = '';
+        return '';
+      }
+
+      this.buffer = matches[2];
+      this.insideComment = false;
+    }
+
+    if (!this.insideComment) {
+      this.buffer = this.buffer.replace(commentFullRegex, '');
+
+      const matches = this.buffer.match(commentStartRegex);
+      if (matches !== null) {
+        this.buffer = matches[1];
+        this.insideComment = true;
+        return '';
+      }
+    }
+
+    const newLines = this.buffer.split("\n");
+    this.buffer = newLines.pop() as string; // keep the last (potentially incomplete) line
+
+    const removeComment = (line: string) => line.replace(/\s*;.*/, "");
+    const removeLeadingWhitespaces = (line: string) => line.replace(/^\s+/, "");
+    const removeTrailingWhitespaces = (line: string) =>
+      line.replace(/\s+$/, "");
+    const removeDoubleSpaces = (line: string) => line.replaceAll(/ +/g, " ");
+    const isNotEmpty = (line: string) => line.length !== 0;
+
+    const newLinesStripped = newLines
+      .map(removeComment)
+      .map(removeLeadingWhitespaces)
+      .map(removeTrailingWhitespaces)
+      .map(removeDoubleSpaces)
+      .filter(isNotEmpty);
+
+    this.lines.push(...newLinesStripped);
+
+    return this.processLines();
+  }
+
+  private processLines() {
+    const processedLines: Array<string> = [];
+    while (this.lines.length >= instructionLength) {
+      const mergeableLines = this.lines.slice(0, instructionLength);
+      if (!mergeableLines.every((line) => line.startsWith("U8"))) {
+        processedLines.push(this.lines.shift() as string);
+        continue;
+      }
+
+      const bytesToMerge = mergeableLines.map((line) =>
+        parseInt((line.match(/U8\s(\d+)/) as RegExpMatchArray)[1])
+      );
+      let mergedBytes = 0;
+      for (let i = 0; i < bytesToMerge.length; i++) {
+        mergedBytes += bytesToMerge[i] << (instructionLength - 1 - i) * 8;
+      }
+      processedLines.push(
+        `${rawDataInstructionLengthPrefix} ${mergedBytes >>> 0}`,
+      );
+      this.lines.splice(0, instructionLength);
+    }
+
+    return processedLines.length === 0 ? "" : `${processedLines.join("\n")}\n`;
   }
 }
 
+async function ppmToAsm(
+  mode: "map" | "sprite",
+  label: string,
+  path: string,
+): Promise<string> {
+  const command = new Deno.Command(ppmToAsmScriptPath, {
+    args: [
+      instructionLength.toString(),
+      mode,
+      label,
+      path,
+    ],
+  });
 
-const asmRawRepresentations = [];
+  const { code, stdout, stderr } = await command.output();
 
-const mapBytes = await getDataFromPPM(mapPath);
-asmRawRepresentations.push(bytesToAsmConstU8('map', mapBytes, mapMatchingStrings, mapWidth));
+  const decoder = new TextDecoder();
 
-for (const [label, path] of Object.entries(spritesPath)) {
-  const bytes = await getDataFromPPM(path);
-  asmRawRepresentations.push(bytesToAsmConstU8(label, bytes, spritesMatchingStrings, spriteWidth));
-}
-
-console.log(asmRawRepresentations.join("\n\n"));
-
-console.log(`
-;
-; RESERVED RAM SPACE
-;
-`);
-
-console.log(await Deno.readTextFile(reservedSpacePath))
-
-/**
- * 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
- * @param matchingStrings An associative array with a string representation for each possible 24 bit data value
- * @param lineLength Optional: Provide a way to wrap the result in multiple lines
- * 
- * @returns The ASM representation of that raw data, pre- and post-fixed by the given label
- */
-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)`);
+  if (code !== 0) {
+    console.error(`ppmToAsm script returned non-zero value: ${code}`);
+    console.error(`STDERR: \n${decoder.decode(stderr)}`);
     Deno.exit(1);
   }
 
-    stringValues.push(`U8 ${matchingStrings[pixelValue]}`);
+  return decoder.decode(stdout);
+}
+
+async function build(
+  pwd: string,
+  path: string,
+  output: WritableStreamDefaultWriter<string>,
+) {
+  const includeExpressionRegex = /^\s*include\s+([^\s;]+)/;
+
+  const file = await Deno.open(`${pwd}/${path}`);
+  const readable = file.readable.pipeThrough(new TextDecoderStream())
+    .pipeThrough(new TextLineStream());
+
+  for await (const line of readable) {
+    const match = line.match(includeExpressionRegex);
+    if (match === null) {
+      await output.write(`${line}\n`);
+      continue;
     }
 
-  const lines = [];
-  if (lineLength === 0) {
-    lines.push(stringValues.join("\t"));
-  } else {
-    for (let i = 0; i < stringValues.length; i += lineLength) {
-      lines.push(stringValues.slice(i, i+lineLength).join("\t"));
-    }
+    await build(pwd, `${match[1]}.asm`, output);
   }
+}
 
-  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`
+function printUsage(into: (message: string) => void) {
+  into(`Usage:
+\tbuild.ts [options...] {file}
+\t\tRead the given file and recursively include other '.asm' files to produce a single output.
+\tbuild.ts --help
+\t\tPrint this message
 
-  return `${label}:
-${lines.join("\n")}
-${label}_end:${paddingString}`
+Options:
+\t--minify\tWhen used, the result will be stripped of all comments, leading/trailing double whitespaces, empty lines and use the more compact raw data representation.
+\t--ppm   \tWhen used, the hardcoded ppm files will be translated to their matching Symfony assembly reprensentation into src/dist.`);
 }
 
 /**
- * Return the image pixels data (excluding all other fields) from a given PPM file
- * 
- * The implementation differ from the format definition (https://netpbm.sourceforge.net/doc/ppm.html) but match the file created by GIMP.
+ *  SCRIPT
  */
-async function getDataFromPPM(path: string): Promise<Uint8Array> {
-  const endOfComment = [
-    0x0a,
-    0x0d,
-  ];
-  const whitespaces = [
-    0x09,
-    0x0a,
-    0x0b,
-    0x0c,
-    0x0d,
-    0x20,
-  ];
-  const numbers = [
-    0x30,
-    0x31,
-    0x32,
-    0x33,
-    0x34,
-    0x35,
-    0x36,
-    0x37,
-    0x38,
-    0x39,
-  ];
 
-  const hashtag = 0x23;
-
-  const content = await Deno.readFile(path);
-  let offset = 0;
-
-  // magic number
-  while(!whitespaces.includes(content[offset])) {
-    offset++;
-  }
-
-  offset++; // whitespace
-
-  // potential comment
-  if (content[offset] === hashtag) {
-    while(!endOfComment.includes(content[offset])) {
-      offset++;
-    }
-
-    offset++; // end of comment
-  }
-
-  // image width
-  while(numbers.includes(content[offset])) {
-    offset++;
-  }
-
-  offset++; // whitespace
-
-  // image height
-  while(numbers.includes(content[offset])) {
-    offset++;
-  }
-
-  offset++; // whitespace
-
-  // maximum color value
-  while(numbers.includes(content[offset])) {
-    offset++;
-  }
-
-  offset++; // whitespace
-
-  return content.slice(offset, content.length);
+if (Deno.args.length < 1) {
+  printUsage(console.error);
+  Deno.exit(1);
 }
+
+let minify = false;
+let convertPPM = false;
+let path: string | undefined = undefined;
+
+Deno.args.forEach((arg, index) => {
+  switch (arg) {
+    case "--help":
+      printUsage(console.log);
+      Deno.exit(0);
+      break;
+    case "--minify":
+      minify = true;
+      break;
+    case "--ppm":
+      convertPPM = true;
+      break;
+
+    default:
+      if (index !== Deno.args.length - 1) {
+        printUsage(console.error);
+        Deno.exit(1);
+      }
+      path = arg;
+      break;
+  }
+});
+
+if (path === undefined) {
+  printUsage(console.error);
+  Deno.exit(1);
+}
+
+if (convertPPM) {
+  await Deno.mkdir(`${Deno.cwd()}/src/dist`, { recursive: true });
+  const mapPromise = async () => {
+    const assembly = await ppmToAsm("map", "map", mapPath);
+    await Deno.writeTextFile(`${Deno.cwd()}/src/dist/map.asm`, assembly);
+  };
+
+  const spritePromises = Object.entries(spritesPath).map(async ([label, path]) => {
+    const assembly = await ppmToAsm("sprite", label, path);
+    const filename = path.split("/").pop()?.split('.')[0];
+    await Deno.writeTextFile(`${Deno.cwd()}/src/dist/${filename}.asm`, assembly);
+  });
+
+  await Promise.all([
+    mapPromise(),
+    ...spritePromises,
+  ]);
+}
+
+const encoder = new TextEncoder();
+const stdoutWritable = new WritableStream<string>({
+  async write(chunk) {
+    await Deno.stdout.write(encoder.encode(chunk));
+  },
+});
+
+const writer = minify
+  ? (new Minifier(stdoutWritable)).stream.writable.getWriter()
+  : stdoutWritable.getWriter();
+
+await build(`${Deno.cwd()}/src`, path, writer);
+await writer.close();

ppmToAsm.ts

@@ -0,0 +1,184 @@
+#!/usr/bin/env -S deno run --allow-read
+
+const ppmCorrespondanceTables = {
+  map: {
+    0x00_00_00: 0, // Empty
+    0xFF_00_00: 1, // Wall
+    0xFF_FF_00: 2, // Coin
+  },
+  sprite: {
+    0x00_00_00: 0, // 0b000_000_00
+    0x00_00_FF: 3, // 0b000_000_11
+    0x00_FF_00: 28, // 0b000_111_00
+    0x99_50_00: 68, // 0b010_001_00
+    0x77_77_77: 110, // 0b011_011_10
+    0xB3_B3_B3: 146, // 0b100_100_10
+    0xFF_00_00: 224, // 0b111_000_00
+    0xFF_00_FF: 227, // 0b111_000_11
+    0xFF_80_00: 240, // 0b111_100_00
+    0xFF_FF_00: 248, // 0b111_110_00
+    0xFF_FF_FF: 255, // 0b111_111_11
+  },
+};
+
+/**
+ * Return an ASM constants (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
+ * @param matchingValues An associative array with a string representation for each possible 24 bit data value
+ * @param instructionLength The size / length in byte of an instruction. Used to pad result to ensure data stays aligned
+ *
+ * @returns The ASM representation of that raw data, pre- and post-fixed by the given label
+ */
+function ppmBytesToCorrespondingAsmConstU8(
+  label: string,
+  data: Uint8Array,
+  matchingValues: Record<number, number>,
+  instructionLength: number,
+): string {
+  if (data.length % 3 !== 0) {
+    console.error(
+      "Length of data passed to bytesToAsmConstU8 are not a multiple of 3 (it needs to, as each resulting byte need a Red, a Green and a Blue value)",
+    );
+    Deno.exit(1);
+  }
+
+  const lines = [`${label}:`];
+  for (let i = 0; i < data.length; i += 3) {
+    const pixelValue = (data[i] << 16) + (data[i + 1] << 8) + (data[i + 2]);
+    if (!Object.hasOwn(matchingValues, pixelValue)) {
+      console.error(
+        `No matching value defined for "${
+          pixelValue.toString(2)
+        }" (which is ${label}'s ${i} pixel)`,
+      );
+      Deno.exit(1);
+    }
+
+    lines.push(`U8 ${matchingValues[pixelValue]}`);
+  }
+  lines.push(`${label}_end:`);
+
+  const bytesNb = data.length / 3;
+  const unalignedBytesNb = bytesNb % instructionLength;
+
+  for (let i = 0; i < instructionLength - unalignedBytesNb; i++) {
+    lines.push(
+      `U8 0 ; padding to preserve ${8 * instructionLength} bits alignment`,
+    );
+  }
+
+  return lines.join("\n");
+}
+
+/**
+ * Return the image pixels data (excluding all other fields) from a given PPM file
+ *
+ * The implementation differ from the format definition (https://netpbm.sourceforge.net/doc/ppm.html) but match the file created by GIMP.
+ */
+async function getDataFromPPM(path: string): Promise<Uint8Array> {
+  const endOfComment = [
+    0x0a,
+    0x0d,
+  ];
+  const whitespaces = [
+    0x09,
+    0x0a,
+    0x0b,
+    0x0c,
+    0x0d,
+    0x20,
+  ];
+  const numbers = [
+    0x30,
+    0x31,
+    0x32,
+    0x33,
+    0x34,
+    0x35,
+    0x36,
+    0x37,
+    0x38,
+    0x39,
+  ];
+
+  const hashtag = 0x23;
+
+  const content = await Deno.readFile(path);
+  let offset = 0;
+
+  // magic number
+  while (!whitespaces.includes(content[offset])) {
+    offset++;
+  }
+
+  offset++; // whitespace
+
+  // potential comment
+  if (content[offset] === hashtag) {
+    while (!endOfComment.includes(content[offset])) {
+      offset++;
+    }
+
+    offset++; // end of comment
+  }
+
+  // image width
+  while (numbers.includes(content[offset])) {
+    offset++;
+  }
+
+  offset++; // whitespace
+
+  // image height
+  while (numbers.includes(content[offset])) {
+    offset++;
+  }
+
+  offset++; // whitespace
+
+  // maximum color value
+  while (numbers.includes(content[offset])) {
+    offset++;
+  }
+
+  offset++; // whitespace
+
+  return content.slice(offset, content.length);
+}
+
+function printUsage(into: (message: string) => void) {
+  into(`Usage:
+\tppmToAsm.ts {instruction length} {map|sprite} {label} {file}
+\t\tConvert the given PPM file into a Symfony assembly representation using the given correspondance table. Result will be padded with "U8 0"s to ensure alignment to given instruction length.
+\tppmToAsm.ts --help
+\t\tPrint this message`);
+}
+
+/**
+ *  SCRIPT
+ */
+
+if (Deno.args.length !== 4) {
+  printUsage(console.error);
+  Deno.exit(1);
+}
+
+if (!(Deno.args[1] in ppmCorrespondanceTables)) {
+  console.error(`"${Deno.args[1]}" is not a valid correspondance table.\n`);
+  printUsage(console.error);
+  Deno.exit(1);
+}
+
+const mode = Deno.args[1] as keyof typeof ppmCorrespondanceTables;
+const correspondanceTable = ppmCorrespondanceTables[mode];
+const label = Deno.args[2];
+const path = Deno.args[3];
+const instructionLength = parseInt(Deno.args[0]);
+
+const ppmData = await getDataFromPPM(path);
+const asm = ppmBytesToCorrespondingAsmConstU8(label, ppmData, correspondanceTable, instructionLength);
+console.log(asm);

readme.md

@@ -25,19 +25,29 @@ The following branches contains variations, allowing comparisons of performances
 
 ## Build script
 
-File inclusion is currently not supported by the game, so a `build.ts` script it provided that will concatenate the content of the hard-coded `.asm` files and output the result on stdout.
+Both scripts uses Deno's API, so you'll need to have a `deno` binary in your PATH.
 
-It also convert the PPM assets (map and sprites) into ASM raw values representation and append it after all the code.
+### PPM to Symfony assembly
+
+Output the Symfony assembly representation of the given PPM file.
 
 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, double spaces and empty lines:
-./build.ts | sed -r 's/\s*;.*//' | sed -r 's/^\s+//' | sed -r 's/ +/ /' | sed -r '/^\s*$/d' > result.asm
+./ppmToAsm.ts map map ./assets/map.ppm > ./dist/map.asm
+./ppmToAsm.ts sprite robot ./assets/sprites/robot.ppm > ./dist/robot.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.
+### Bundle and minify
+
+Bundle all `.asm` and `.ppm` files and output the (optionaly minified) result.
+
+Usage example:
+```sh
+./build.ts --minify main.asm > pacman.asm
+
+# To beforehand convert all ppm files
+./build.ts --ppm --minify main.asm > pacman.asm
+```
 
 ## Documentation
 

src/consts/game.asm

@@ -2,16 +2,3 @@ pub const game.direction_up = 0
 pub const game.direction_right = 1
 pub const game.direction_down = 2
 pub const game.direction_left = 3
-pub const game.direction_still = 4
-
-; 1_000_000_000 nano second = 0x0000_0000_3B9A_CA00
-; pub const game.tick_duration_0 = 0xCA00
-; pub const game.tick_duration_1 = 0x3B9A
-; pub const game.tick_duration_2 = 0x0000
-; pub const game.tick_duration_3 = 0x0000
-
-; 0.5 second = 500_000_000 nano second = 0x0000_0000_1DCD_6500
-pub const game.tick_duration_0 = 0x6500
-pub const game.tick_duration_1 = 0x1DCD
-pub const game.tick_duration_2 = 0x0000
-pub const game.tick_duration_3 = 0x0000

src/consts/screen.asm

@@ -1,21 +1,21 @@
-; Screen pixel mode (settings #0)
-; 0: ASCII  8
-; 1: ASCII 24
-; 2: Pixel  8
-; 3: Pixel 24
-
-; While in mode #2 (Pixel 8)
-  ; Screen memory offset (settings #1)
-  ; Screen resolutions (settings #2)
-    ; 0. 80x60
-    ; 1. 160x120
-    ; 2. 256x192
-    ; 3. 320x240
-    ; 4. 640x480
-    ; 5. 800x600
-    ; 6. 920x720
-    ; 7. 1024x768
+/* Screen pixel mode (settings #0)
+	0: ASCII  8
+	1: ASCII 24
+	2: Pixel  8
+	3: Pixel 24
 
+	While in mode #2 (Pixel 8)
+		Screen memory offset (settings #1)
+		Screen resolutions (settings #2)
+			0. 80x60
+			1. 160x120
+			2. 256x192
+			3. 320x240
+			4. 640x480
+			5. 800x600
+			6. 920x720
+			7. 1024x768
+*/
 pub const screen.mode_index = 0
 pub const screen.mode_value = 2
 pub const screen.offset_index = 1

src/consts/sprites.asm

@@ -7,12 +7,23 @@ 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.empty = 0 ; must stay 0 (some code avoid addition when it knows the tile is empty)
 pub const sprites.unimplemented = 1
 pub const sprites.wall_end = 2
 pub const sprites.wall_straight = 3
 pub const sprites.wall_corner = 4
+
 pub const sprites.robot = 5
-pub const sprites.ghost = 6
-pub const sprites.coin = 7
-pub const sprites.max = 7 ; for lookup table
+pub const sprites.robot_up = 5
+pub const sprites.robot_right = 6
+pub const sprites.robot_down = 7
+pub const sprites.robot_left = 8
+
+pub const sprites.ghost = 9
+pub const sprites.ghost_up = 9
+pub const sprites.ghost_right = 10
+pub const sprites.ghost_down = 11
+pub const sprites.ghost_left = 12
+
+pub const sprites.coin = 13
+pub const sprites.max = 13 ; for lookup table

src/init.asm

@@ -1,70 +0,0 @@
-;
-;   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_wall_end
-add r1, zr, sprites.wall_end
-lsl r2, r1, arch.instruction_increment_shift
-add r2, r2, ptr.textures_addresses
-add r3, zr, sprite_wall_end
-store_32 [r2], r3
-; sprite_wall_straight
-add r1, zr, sprites.wall_straight
-lsl r2, r1, arch.instruction_increment_shift
-add r2, r2, ptr.textures_addresses
-add r3, zr, sprite_wall_straight
-store_32 [r2], r3
-; sprite_wall_corner
-add r1, zr, sprites.wall_corner
-lsl r2, r1, arch.instruction_increment_shift
-add r2, r2, ptr.textures_addresses
-add r3, zr, sprite_wall_corner
-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, ptr.screen
-screen r1, r2
-
-mov r1, screen.resolution_index
-screen r1, screen.resolution_value

src/lib/drawing.asm

@@ -1,24 +1,13 @@
-include ../consts/offsets
-include ../consts/map
-include ../consts/screen
-include ../consts/scene
-include ../consts/sprites
-include sprite_rotation
+/* Draw the whole map (fill the screen memory with the values of the sprites based on the map)
 
-; /* 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`)
-; */
+	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
@@ -52,19 +41,71 @@ pub drawing.draw_whole_map:
 
     ret
 
-; /* Return the top-left pixel address of the tile at the given map coordinates
+/*	Draw the tile corresponding to the given coordinate with it's map content
 
-; Inputs:
-; 	r1: map x coord
-; 	r2: map y coord
+	Inputs:
+		r1, r2: Map coordinates x, y
 
-; Locals:
-; 	r3: counter
-; 	r4: offset per tile row (screen width * tile height)
+	Locals:
+		r3: tile value / sprite id / sprite address offset
+		r9: pointer
+		r13: screen address
+*/
+pub drawing.clear_tile:
+	push r1
+	push r2
+	push r3
+	push r9
+	push r13
 
-; Ouputs:
-; 	r13: the pixel address
-; */
+	add r9, r1, map
+	push r2
+	pub drawing.clear_tile_row_loop:
+		cmp r2, 0
+		je drawing.clear_tile_row_loop_end
+		sub r2, r2, 1
+		add r9, r9, map.width
+		jmp drawing.clear_tile_row_loop
+	pub drawing.clear_tile_row_loop_end:
+	pop r2
+
+	load_8 r3, [r9]
+	cmp r3, map.tiles.coin
+	add r9, zr, ptr.textures_addresses
+	jne drawing.clear_tile_get_screen_address
+	; coin
+	mov r3, sprites.coin
+	lsl r3, r3, arch.instruction_increment_shift
+	add r9, r9, r3
+
+	pub drawing.clear_tile_get_screen_address:
+	call get_tile_address
+
+	mov r1, r13
+	load_32 r2, [r9]
+	mov r3, sprites.rotation_0
+	call draw_sprite
+
+	pop r13
+	pop r9
+	pop r3
+	pop r2
+	pop r1
+	ret
+
+/* Return the top-left pixel address of the tile at the given map coordinates
+
+	Inputs:
+		r1: map x coord
+		r2: map y coord
+
+	Locals:
+		r3: counter
+		r4: offset per tile row (screen width * tile height)
+
+	Ouputs:
+		r13: the pixel address
+*/
 get_tile_address:
 	push r3
 	push r4
@@ -111,17 +152,18 @@ get_tile_address:
 	pop r3
 	ret
 
-; /* Get address of given sprite id
 
-; Inputs:
-; 	r1: sprite id
+/* Get address of given sprite id
 
-; Outputs:
-; 	r13: address
+	Inputs:
+		r1: sprite id
 
-; Locals:
-;		r2: pointer address
-; */
+	Outputs:
+		r13: address
+
+	Locals:
+		r2: pointer address
+*/
 get_sprite_address:
 	push r1
 	push r2
@@ -139,21 +181,19 @@ get_sprite_address:
 	pop r1
 	ret
 
-; /* Draw given sprite on the screen at given map coordinates
+/* Draw given sprite on the screen at given map coordinates
 
-; Inputs:
-; 	r1: map x coord
-; 	r2: map y coord
-; 	r3: sprite rotation
-; 	r4: sprite id
+	Inputs:
+		r1: map x coord
+		r2: map y coord
+		r3: sprite rotation
+		r4: sprite id
 
-; Outputs:
-
-; Locals:
-; 	r1: screen address
-; 	r2: sprite address
-; 	r13: value returned by call to `get_tile_address` and `get_sprite_address`
-; */
+	Locals:
+		r1: screen address
+		r2: sprite address
+		r13: value returned by call to `get_tile_address` and `get_sprite_address`
+*/
 pub drawing.draw_sprite_at_map_coord:
 	push r1
 	push r2
@@ -179,24 +219,22 @@ pub drawing.draw_sprite_at_map_coord:
 	pop r1
 	ret
 
-; /* Draw given sprite (by address) at given screen position (by address) with given rotation
+/* Draw given sprite (by address) at given screen position (by address) with given rotation
 
-; Inputs:
-; 	r1: screen address
-; 	r2: sprite address
-; 	r3: rotation
+	Inputs:
+		r1: screen address
+		r2: sprite address
+		r3: rotation
 
-; Outputs:
-
-; Locals:
-; 	r1: current screen pixel address
-; 	r4: x
-; 	r5: y
-; 	r6: current sprite pixel address
-; 	r7: color
-; 	r8: x increment
-; 	r9: y increment
-; */
+	Locals:
+		r1: current screen pixel address
+		r4: x
+		r5: y
+		r6: current sprite pixel address
+		r7: color
+		r8: x increment
+		r9: y increment
+*/
 draw_sprite:
 	push r1
 	push r2

src/lib/game.asm

@@ -1,13 +1,12 @@
+/* Return the tile address from the given map coordinate
 
-; /* Return the tile address from the given map coordinate
+    Inputs:
+        r1: x map coordinate
+        r2: y map coordinate
 
-; Inputs:
-;   r1: x map coordinate
-;   r2: y map coordinate
-
-; Outputs:
-;   r13: tile address
-; */
+    Outputs:
+        r13: tile address
+*/
 pub game.get_tile_address_from_map_coord:
     push r1
     push r2

src/lib/sprite_rotation.asm

@@ -1,26 +1,22 @@
-include ../consts/offsets
-include ../consts/map
-include ../consts/sprites
+/* Return the sprite id and rotation for the given map coordinates
 
-; /* Return the sprite id and rotation for the given map coordinates
+    Inputs:
+        r1: x map coord
+        r2: y map coord
 
-; Inputs:
-;     r1: x map coord
-;     r2: y map coord
+    Outputs:
+        r12: sprite rotation
+        r13: sprite id
 
-; 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
-; */
+    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

src/lib/u64.asm

@@ -0,0 +1,18 @@
+/*  Add two unsigned 64 bit
+
+    Input:
+        r1, r2: A.high, A.low
+        r3, r4: B.high, B.low
+
+    Output:
+        r5, r6: C.high, C.low
+*/
+pub u64.add:
+    add r5, r1, r3
+    add r6, r2, r4
+    cmp r6, r2
+    jae u64.add_no_low_overflow
+    add r5, r5, 1 ; overflow
+
+    pub u64.add_no_low_overflow:
+    ret

src/main.asm

@@ -1,350 +1,69 @@
+include consts/arch
+include consts/game
+include consts/keyboard
+include consts/map
+include consts/scene
 include consts/screen
+include consts/sprites
 
-include init
+include sections/init_sprite_lookup_table
+include sections/init_screen
 
 call drawing.draw_whole_map
 
-;
-;   State initialization
-;
-; Robot
-const robot_initial_x = 1
-const robot_initial_y = 1
-const robot_initial_direction = game.direction_down
-
-mov r1, robot_initial_x
-mov r2, robot_initial_y
-mov r5, robot_initial_direction
-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 r4, sprites.robot
-call drawing.draw_sprite_at_map_coord
-
-; Ghost
-const ghost_initial_x = 13
-const ghost_initial_y = 1
-const ghost_initial_direction = game.direction_down
-
-mov r1, ghost_initial_x
-mov r2, ghost_initial_y
-mov r5, ghost_initial_direction
-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 r4, sprites.ghost
-call drawing.draw_sprite_at_map_coord
-
-;
-;   Time initialization
-;
-add r1, zr, ptr.tick_duration_low
-load_32 r2, [r1]
-add r1, zr, ptr.tick_duration_high
-load_32 r3, [r1]
-
-time_0 r4
-time_1 r5
-add r4, r4, r2
-add r5, r5, r3
-cmp r4, r2
-jae init_store_next_tick
-add r5, r5, 1 ; overflow
-
-init_store_next_tick:
-add r1, zr, ptr.next_tick_low
-store_32 [r1], r4
-add r1, zr, ptr.next_tick_high
-store_32 [r1], r5
+include sections/init_robot_state
+include sections/init_ghost_state
+include sections/init_timers
 
 game_loop:
-    ;
-    ;   Event handling
-    ;
-    ; r1 = keyboard event+key / direction
-    ; r2 = keyboard key / direction address
-    ; r3 = keyboard event
-    ; r4 = jump address
-    keyboard r1
-    and r2, r1, keyboard.mask_key
-    and r3, r1, keyboard.mask_event
+    include sections/handle_event
 
-    cmp r3, keyboard.event_pressed
-    jne game_loop_event_handling_end
-    cmp r2, keyboard.key_min
-    jb game_loop_event_handling_end
-    cmp r2, keyboard.key_max
-    ja game_loop_event_handling_end
+    /*
+    For all timers:
+        r1, r2: tick duration high, low
+        r7, r8: now high, low
+    */
+    add r9, zr, ptr.tick_duration_high
+    load_32 r1, [r9]
+    add r9, zr, ptr.tick_duration_low
+    load_32 r2, [r9]
+    time_0 r8
+    time_1 r7
 
-    sub r4, r2, keyboard.key_min ; so the first value is 0
-    lsl r4, r4, 3 ; 2 * instruction length = 8
-    add r4, r4, game_loop_key_jump_table_start
-    jmp r4
-
-    game_loop_key_jump_table_start:
-    ; key_up
-    mov r1, game.direction_up
-    jmp game_loop_event_handling_store_direction
-    ; key_right
-    mov r1, game.direction_right
-    jmp game_loop_event_handling_store_direction
-    ; key_down:
-    mov r1, game.direction_down
-    jmp game_loop_event_handling_store_direction
-    ; key_left:
-    mov r1, game.direction_left
-;    jmp game_loop_event_handling_end
-
-    game_loop_event_handling_store_direction:
-    add r2, zr, ptr.state_robot
-    add r2, r2, 2
-    store_8 [r2], r1
-
-    game_loop_event_handling_end:
-
-    ;
-    ;   Elapsed time check
-    ;
-    ; r1: address
-    ; r2: now low / delay low
-    ; r3: now high / delay high
-    ; r4: next tick low
-    ; r5: next tick high
-    ;
-    time_0 r2
-    time_1 r3
-
-    add r1, zr, ptr.next_tick_low
-    load_32 r4, [r1]
-    add r1, zr, ptr.next_tick_high
-    load_32 r5, [r1]
-
-    cmp r3, r5
-    jb game_loop
-    ja update_next_tick
-    cmp r2, r4
-    jb game_loop
-
-    update_next_tick:
-    add r1, zr, ptr.tick_duration_low
-    load_32 r2, [r1]
-    add r1, zr, ptr.tick_duration_high
-    load_32 r3, [r1]
-    add r4, r4, r2
-    add r5, r5, r3
-    cmp r4, r2
-    jae store_next_tick
-    add r5, r5, 1
-
-    store_next_tick:
-    add r1, zr, ptr.next_tick_low
-    store_32 [r1], r4
-    add r1, zr, ptr.next_tick_high
-    store_32 [r1], r5
-
-
-    ;
-    ;   Robot movement
-    ;
-    ; r1 = robot's state address
-    ; r2 = x
-    ; r3 = y
-    ; r4 = direction
-    ; r5 = new x
-    ; r6 = new y
-    ; r7 = new position address
-    ; r8 = new position content
-    ; r9 = jump address
-    add r1, zr, ptr.state_robot
-    load_8 r2, [r1]
-    add r1, r1, 1
-    load_8 r3, [r1]
-    add r1, r1, 1
-    load_8 r4, [r1]
-
-    mov r5, r2
-    mov r6, r3
-
-    lsl r9, r4, 3 ; 2 * instruction size = 8
-    add r9, r9, game_loop_robot_movement_jump_table_start
-    jmp r9
-
-    game_loop_robot_movement_jump_table_start:
-    ; direction_up
-    sub r6, r6, 1
-    jmp game_loop_robot_movement_try_move
-    ; direction_right
-    add r5, r5, 1
-    jmp game_loop_robot_movement_try_move
-    ; direction_down
-    add r6, r6, 1
-    jmp game_loop_robot_movement_try_move
-    ; direction_left
-    sub r5, r5, 1
-    jmp game_loop_robot_movement_try_move
-    ; direction_still
-    jmp game_loop_robot_movement_none
-
-    game_loop_robot_movement_try_move:
+    push r1
     push r2
-    mov r1, r5
-    mov r2, r6
-    call game.get_tile_address_from_map_coord
-    mov r7, r13
+    push r7
+    push r8
+    include sections/timer_robot
+    pop r8
+    pop r7
     pop r2
+    pop r1
 
-    ;
-    ;   Collision handling
-    ;
-    load_8 r8, [r7]
-    cmp r8, map.tiles.wall
-    jne game_loop_robot_movement_some
-    ; hit wall
-    add r1, zr, ptr.state_robot
-    add r1, r1, 2
-    mov r4, game.direction_still
-    store_8 [r1], r4
-    jmp game_loop_robot_movement_none
-
-    game_loop_robot_movement_some:
-    ; TODO: handle coin and empty differently
-    mov r8, map.tiles.empty
-    store_8 [r7], r8
-
-    add r1, zr, ptr.state_robot
-    store_8 [r1], r5
-    add r1, r1, 1
-    store_8 [r1], r6
-
-    ; clear old position
-    mov r1, r2
-    mov r2, r3
-    mov r3, sprites.rotation_0
-    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 r4, sprites.robot
-    call drawing.draw_sprite_at_map_coord
-
-
-    game_loop_robot_movement_none:
-
-    ;
-    ;   Ghost movement
-    ;
-    ; r1: ghost's state address
-    ; r2: x
-    ; r3: y
-    ; r4: direction
-    ; r5: x increment
-    ; r6: y increment
-    ; r7: new x
-    ; r8: new y
-    ; r9: new position address
-    ; r10: new position content
-    ; r11: jump address
-    add r1, zr, ptr.state_ghost
-    load_8 r2, [r1]
-    add r1, r1, 1
-    load_8 r3, [r1]
-    add r1, r1, 1
-    load_8 r4, [r1]
-
-    mov r5, 0
-    mov r6, 0
-
-    lsl r11, r4, 3 ; 2 * instruction size = 8
-    add r11, r11, game_loop_ghost_movement_jump_table_start
-    jmp r11
-
-    game_loop_ghost_movement_jump_table_start:
-    ; direction_up
-    sub r6, r6, 1
-    jmp game_loop_ghost_movement_make_move
-    ; direction_right
-    add r5, r5, 1
-    jmp game_loop_ghost_movement_make_move
-    ; direction_down
-    add r6, r6, 1
-    jmp game_loop_ghost_movement_make_move
-    ; direction_left
-    sub r5, r5, 1
-    ;jmp game_loop_ghost_movement_make_move
-    ; direction_still (should never happen)
-
-    game_loop_ghost_movement_make_move:
-    add r7, r2, r5
-    add r8, r3, r6
-    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
-    pop r2
-
-    ; draw tile at previous position
-    load_8 r1, [r9]
-    cmp r1, map.tiles.coin
-    je game_loop_ghost_movement_old_tile_coin
-    ; old tile empty
-    mov r4, sprites.empty
-    jmp game_loop_ghost_movement_draw_old_tile
-    game_loop_ghost_movement_old_tile_coin:
-    mov r4, 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 r4, sprites.ghost
-    call drawing.draw_sprite_at_map_coord
-
-    ;
-    ;   Check ahead for direction change
-    ;
-    add r1, r7, r5
-    add r2, r8, r6
-    call game.get_tile_address_from_map_coord
-
-    load_8 r10, [r13]
-    cmp r10, map.tiles.wall
-    jne game_loop_ghost_movement_end
-    ; increment direction
-    add r1, zr, ptr.state_ghost
-    add r1, r1, 2
-    load_8 r4, [r1]
-    add r4, r4, 1
-    and r4, r4, 0b11 ; modulo 3
-    store_8 [r1], r4
-
-    game_loop_ghost_movement_end:
+    include sections/timer_ghost
 
 jmp game_loop
 
+include lib/u64
+include lib/game
 include lib/drawing
+include lib/sprite_rotation
+
+include dist/empty
+include dist/placeholder
+include dist/wall_end
+include dist/wall_straight
+include dist/wall_corner
+include dist/robot_up
+include dist/robot_right
+include dist/robot_down
+include dist/robot_left
+include dist/ghost_up
+include dist/ghost_right
+include dist/ghost_down
+include dist/ghost_left
+include dist/coin
+
+include dist/map
+
+include reserved_space

src/reserved_space.asm

@@ -5,8 +5,14 @@ U32 0 ; placeholder
 U32 0 ; wall_end
 U32 0 ; wall_straight
 U32 0 ; wall_corner
-U32 0 ; robot
-U32 0 ; ghost
+U32 0 ; robot up
+U32 0 ; robot right
+U32 0 ; robot down
+U32 0 ; robot left
+U32 0 ; ghost up
+U32 0 ; ghost right
+U32 0 ; ghost down
+U32 0 ; ghost left
 U32 0 ; coin
 
 ; 0.5 second = 500_000_000 nano second = 0x0000_0000_1DCD_6500
@@ -17,8 +23,11 @@ pub ptr.tick_duration_low:  U32 0x1DCD_6500
 ; 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.timer_robot_next_tick_high: U32 0x0000_0000
+pub ptr.timer_robot_next_tick_low: U32 0x1DCD_6500
+
+pub ptr.timer_ghost_next_tick_high: U32 0
+pub ptr.timer_ghost_next_tick_low: U32 0x0EE6_B280
 
 pub ptr.state_robot:
 U8 0 ; x coord

src/sections/handle_event.asm

@@ -0,0 +1,43 @@
+/*  Event handling
+    
+    r1 = keyboard event+key / direction
+    r2 = keyboard key / direction address
+    r3 = keyboard event
+    r4 = jump address
+*/
+keyboard r1
+and r2, r1, keyboard.mask_key
+and r3, r1, keyboard.mask_event
+
+cmp r3, keyboard.event_pressed
+jne handle_event_end
+cmp r2, keyboard.key_min
+jb handle_event_end
+cmp r2, keyboard.key_max
+ja handle_event_end
+
+sub r4, r2, keyboard.key_min ; so the first value is 0
+lsl r4, r4, 3 ; 2 * instruction length = 8
+add r4, r4, handle_event_jump_table_start
+jmp r4
+
+handle_event_jump_table_start:
+; key_up
+mov r1, game.direction_up
+jmp handle_event_store_direction
+; key_right
+mov r1, game.direction_right
+jmp handle_event_store_direction
+; key_down:
+mov r1, game.direction_down
+jmp handle_event_store_direction
+; key_left:
+mov r1, game.direction_left
+;jmp handle_event_end
+
+handle_event_store_direction:
+add r2, zr, ptr.state_robot
+add r2, r2, 2
+store_8 [r2], r1
+
+handle_event_end:

src/sections/init_ghost_state.asm

@@ -0,0 +1,17 @@
+const ghost_initial_x = 13
+const ghost_initial_y = 1
+const ghost_initial_direction = game.direction_down
+
+mov r1, ghost_initial_x
+mov r2, ghost_initial_y
+mov r5, ghost_initial_direction
+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 r4, sprites.ghost_down
+call drawing.draw_sprite_at_map_coord

src/sections/init_robot_state.asm

@@ -0,0 +1,17 @@
+const robot_initial_x = 1
+const robot_initial_y = 1
+const robot_initial_direction = game.direction_down
+
+mov r1, robot_initial_x
+mov r2, robot_initial_y
+mov r5, robot_initial_direction
+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 r4, sprites.robot_down
+call drawing.draw_sprite_at_map_coord

src/sections/init_screen.asm

@@ -0,0 +1,10 @@
+; r1 = screen parameter value
+mov r1, screen.mode_index
+screen r1, screen.mode_value
+
+mov r1, screen.offset_index
+add r2, zr, ptr.screen
+screen r1, r2
+
+mov r1, screen.resolution_index
+screen r1, screen.resolution_value

src/sections/init_sprite_lookup_table.asm

@@ -0,0 +1,94 @@
+/*  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_wall_end
+add r1, zr, sprites.wall_end
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_wall_end
+store_32 [r2], r3
+; sprite_wall_straight
+add r1, zr, sprites.wall_straight
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_wall_straight
+store_32 [r2], r3
+; sprite_wall_corner
+add r1, zr, sprites.wall_corner
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_wall_corner
+store_32 [r2], r3
+
+; sprite_robot_up
+add r1, zr, sprites.robot_up
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_robot_up
+store_32 [r2], r3
+; sprite_robot_right
+add r1, zr, sprites.robot_right
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_robot_right
+store_32 [r2], r3
+; sprite_robot_down
+add r1, zr, sprites.robot_down
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_robot_down
+store_32 [r2], r3
+; sprite_robot_left
+add r1, zr, sprites.robot_left
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_robot_left
+store_32 [r2], r3
+
+; sprite_ghost_up
+add r1, zr, sprites.ghost_up
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_ghost_up
+store_32 [r2], r3
+; sprite_ghost_right
+add r1, zr, sprites.ghost_right
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_ghost_right
+store_32 [r2], r3
+; sprite_ghost_down
+add r1, zr, sprites.ghost_down
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_ghost_down
+store_32 [r2], r3
+; sprite_ghost_left
+add r1, zr, sprites.ghost_left
+lsl r2, r1, arch.instruction_increment_shift
+add r2, r2, ptr.textures_addresses
+add r3, zr, sprite_ghost_left
+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

src/sections/init_timers.asm

@@ -0,0 +1,34 @@
+/*
+    r1, r2: now high, low
+    r3, r4: initial delay high, low
+    r5, r6: next tick high, low
+    r7: pointer
+*/
+time_0 r2
+time_1 r1
+
+; Robot
+add r7, zr, ptr.timer_robot_next_tick_high
+load_32 r3, [r7]
+add r7, zr, ptr.timer_robot_next_tick_low
+load_32 r4, [r7]
+
+call u64.add
+
+add r7, zr, ptr.timer_robot_next_tick_high
+store_32 [r7], r5
+add r7, zr, ptr.timer_robot_next_tick_low
+store_32 [r7], r6
+
+; Ghost
+add r7, zr, ptr.timer_ghost_next_tick_high
+load_32 r3, [r7]
+add r7, zr, ptr.timer_ghost_next_tick_low
+load_32 r4, [r7]
+
+call u64.add
+
+add r7, zr, ptr.timer_ghost_next_tick_high
+store_32 [r7], r5
+add r7, zr, ptr.timer_ghost_next_tick_low
+store_32 [r7], r6

src/sections/timer_ghost.asm

@@ -0,0 +1,99 @@
+/*  Timer comparison / update
+    r1, r2: tick duration high, low [IN]
+    r3, r4: next tick high, low
+    r5, r6: tick after this one high, low
+    r7, r8: now high, low [IN]
+    r9: pointer
+*/
+add r9, zr, ptr.timer_ghost_next_tick_high
+load_32 r3, [r9]
+add r9, zr, ptr.timer_ghost_next_tick_low
+load_32 r4, [r9]
+
+cmp r7, r3
+jb timer_ghost.end
+ja timer_ghost.trigger
+cmp r8, r4
+jb timer_ghost.end
+
+pub timer_ghost.trigger:
+; udate next_tick
+call u64.add
+add r9, zr, ptr.timer_ghost_next_tick_high
+store_32 [r9], r5
+add r9, zr, ptr.timer_ghost_next_tick_low
+store_32 [r9], r6
+
+
+/*  Movement
+    r1, r2: x, y
+    r3: rotation
+    r4: direction / sprite id
+    r5, r6: increments x, y
+    r7, r8: [RESERVED]
+    r9: pointer
+    r10: tile content
+    r13: tile address
+*/
+add r9, zr, ptr.state_ghost
+load_8 r1, [r9]
+add r9, r9, 1
+load_8 r2, [r9]
+add r9, r9, 1
+load_8 r4, [r9]
+
+call drawing.clear_tile
+
+mov r5, 0
+mov r6, 0
+
+lsl r9, r4, 3 ; 2 * instruction size = 8
+add r9, r9, timer_ghost.direction_jump_table
+jmp r9
+
+pub timer_ghost.direction_jump_table:
+; direction_up
+sub r6, r6, 1
+jmp timer_ghost.move
+; direction_right
+add r5, r5, 1
+jmp timer_ghost.move
+; direction_down
+add r6, r6, 1
+jmp timer_ghost.move
+; direction_left
+sub r5, r5, 1
+;jmp timer_ghost.move
+
+pub timer_ghost.move:
+add r1, r1, r5
+add r2, r2, r6
+add r9, zr, ptr.state_ghost
+store_8 [r9], r1
+add r9, r9, 1
+store_8 [r9], r2
+
+; draw ghost on new position
+mov r3, sprites.rotation_0
+add r4, r4, sprites.ghost
+call drawing.draw_sprite_at_map_coord
+
+/*
+    Check ahead for direction change
+*/
+add r1, r1, r5
+add r2, r2, r6
+call game.get_tile_address_from_map_coord
+
+load_8 r10, [r13]
+cmp r10, map.tiles.wall
+jne timer_ghost.end
+; increment direction
+add r9, zr, ptr.state_ghost
+add r9, r9, 2
+load_8 r4, [r9]
+add r4, r4, 1
+and r4, r4, 0b11 ; modulo 3
+store_8 [r9], r4
+
+pub timer_ghost.end:

src/sections/timer_robot.asm

@@ -0,0 +1,99 @@
+/*  Timer comparison / update
+    r1, r2: tick duration high, low [IN]
+    r3, r4: next tick high, low
+    r5, r6: tick after this one high, low
+    r7, r8: now high, low [IN]
+    r9: pointer
+*/
+add r9, zr, ptr.timer_robot_next_tick_high
+load_32 r3, [r9]
+add r9, zr, ptr.timer_robot_next_tick_low
+load_32 r4, [r9]
+
+cmp r7, r3
+jb timer_robot.end
+ja timer_robot.trigger
+cmp r8, r4
+jb timer_robot.end
+
+pub timer_robot.trigger:
+; udate next_tick
+call u64.add
+add r9, zr, ptr.timer_robot_next_tick_high
+store_32 [r9], r5
+add r9, zr, ptr.timer_robot_next_tick_low
+store_32 [r9], r6
+
+
+/*  Movement
+    r1, r2: x, y
+    r3: rotation
+    r4: direction / sprite id
+    r5, r6: increments x, y
+    r7, r8: [RESERVED]
+    r9: pointer
+    r10: tile content
+    r13: tile address
+*/
+add r9, zr, ptr.state_robot
+load_8 r1, [r9]
+add r9, r9, 1
+load_8 r2, [r9]
+add r9, r9, 1
+load_8 r4, [r9]
+
+call drawing.clear_tile
+
+mov r5, 0
+mov r6, 0
+
+lsl r9, r4, 3 ; 2 * instruction size = 8
+add r9, r9, timer_robot.direction_jump_table
+jmp r9
+
+pub timer_robot.direction_jump_table:
+; direction_up
+sub r6, r6, 1
+jmp timer_robot.try_move
+; direction_right
+add r5, r5, 1
+jmp timer_robot.try_move
+; direction_down
+add r6, r6, 1
+jmp timer_robot.try_move
+; direction_left
+sub r5, r5, 1
+;jmp timer_robot.try_move
+
+/*
+    Collision handling
+*/
+pub timer_robot.try_move:
+add r1, r1, r5
+add r2, r2, r6
+call game.get_tile_address_from_map_coord
+load_8 r10, [r13]
+cmp r10, map.tiles.wall
+jne timer_robot.move
+; hit wall -> cancel movement
+sub r1, r1, r5
+sub r2, r2, r6
+jmp timer_robot.draw
+
+pub timer_robot.move:
+; TODO: handle coin and empty differently
+mov r10, map.tiles.empty
+store_8 [r13], r10
+
+add r9, zr, ptr.state_robot
+store_8 [r9], r1
+add r9, r9, 1
+store_8 [r9], r2
+
+pub timer_robot.draw:
+; draw robot on new position
+mov r3, sprites.rotation_0
+add r4, r4, sprites.robot
+call drawing.draw_sprite_at_map_coord
+
+pub timer_robot.end: