One post tagged with "game-dev"

// Compilation Process
const GameUI = () => (
  <Canvas>
    <Text x={10} y={10}>
      Hello World
    </Text>
  </Canvas>
);

// Compiles to:
function renderGameUI() {
  // Clear screen
  glClear(GL_COLOR_BUFFER_BIT);

  // Draw text
  drawText(10, 10, "Hello World", "#ffffff");

  // Submit to GPU
  glFlush();
}

// Canvas Component (Root)
class Canvas extends Component {
  constructor(props) {
    super(props);
    this.canvas = document.createElement("canvas");
    this.gl = this.canvas.getContext("webgl");
    this.renderLoop = this.renderLoop.bind(this);
  }

  componentDidMount() {
    this.renderLoop();
  }

  renderLoop() {
    // Clear screen
    this.gl.clear(this.gl.COLOR_BUFFER_BIT);

    // Render children
    this.renderChildren();

    // Request next frame
    requestAnimationFrame(this.renderLoop);
  }

  render() {
    return this.props.children;
  }
}

// Text Component
class Text extends Component {
  render() {
    const { x, y, color = "#fff", children } = this.props;

    // Emit draw command
    this.context.emitCommand({
      type: "DRAW_TEXT",
      x,
      y,
      color,
      text: children,
    });

    return null; // No DOM element
  }
}

// Button Component
class Button extends Component {
  render() {
    const { x, y, width, height, onClick, children } = this.props;

    // Emit draw command
    this.context.emitCommand({
      type: "DRAW_BUTTON",
      x,
      y,
      width,
      height,
      text: children,
      onClick,
    });

    return null;
  }
}

// Command Buffer
class CommandBuffer {
  constructor() {
    this.commands = [];
    this.batchSize = 1000;
  }

  addCommand(command) {
    this.commands.push(command);

    if (this.commands.length >= this.batchSize) {
      this.flush();
    }
  }

  flush() {
    // Sort commands by type for batching
    const sortedCommands = this.sortCommands(this.commands);

    // Execute in batches
    this.executeBatch(sortedCommands);

    this.commands = [];
  }

  sortCommands(commands) {
    // Group by type for efficient batching
    const groups = {
      DRAW_RECT: [],
      DRAW_TEXT: [],
      DRAW_TEXTURE: [],
      DRAW_CIRCLE: [],
    };

    commands.forEach((cmd) => {
      groups[cmd.type].push(cmd);
    });

    return groups;
  }

  executeBatch(groups) {
    // Execute each group efficiently
    Object.entries(groups).forEach(([type, commands]) => {
      this.executeCommands(type, commands);
    });
  }
}

// Game Engine Renderer
class GameRenderer {
  constructor(gl) {
    this.gl = gl;
    this.shaders = this.createShaders();
    this.buffers = this.createBuffers();
  }

  drawRect(x, y, width, height, color) {
    // Set shader uniforms
    this.gl.uniform2f(this.shaders.position, x, y);
    this.gl.uniform2f(this.shaders.size, width, height);
    this.gl.uniform4f(this.shaders.color, ...this.parseColor(color));

    // Draw rectangle
    this.gl.drawArrays(this.gl.TRIANGLES, 0, 6);
  }

  drawText(x, y, text, color) {
    // Use signed distance field for crisp text
    this.gl.uniform2f(this.shaders.position, x, y);
    this.gl.uniform4f(this.shaders.color, ...this.parseColor(color));

    // Render text using texture atlas
    this.renderText(text);
  }

  drawButton(x, y, width, height, text, onClick) {
    // Draw button background
    this.drawRect(x, y, width, height, "#4CAF50");

    // Draw button text
    this.drawText(x + 10, y + 15, text, "#fff");

    // Handle click detection
    this.handleClick(x, y, width, height, onClick);
  }
}

// Reuse objects to avoid GC
class ObjectPool {
  constructor(createFn, resetFn) {
    this.pool = [];
    this.createFn = createFn;
    this.resetFn = resetFn;
  }

  get() {
    return this.pool.pop() || this.createFn();
  }

  release(obj) {
    this.resetFn(obj);
    this.pool.push(obj);
  }
}

// Usage
const commandPool = new ObjectPool(
  () => ({ type: "", x: 0, y: 0, width: 0, height: 0 }),
  (cmd) => {
    cmd.type = "";
    cmd.x = 0;
    cmd.y = 0;
  }
);

// Only render visible elements
class SpatialHash {
  constructor(cellSize) {
    this.cellSize = cellSize;
    this.grid = new Map();
  }

  insert(element) {
    const cell = this.getCell(element.x, element.y);
    if (!this.grid.has(cell)) {
      this.grid.set(cell, []);
    }
    this.grid.get(cell).push(element);
  }

  query(viewport) {
    const visible = [];
    const cells = this.getCellsInViewport(viewport);

    cells.forEach((cell) => {
      const elements = this.grid.get(cell) || [];
      visible.push(...elements);
    });

    return visible;
  }
}

// Batch similar commands
class CommandBatcher {
  constructor() {
    this.batches = new Map();
  }

  addCommand(command) {
    const key = this.getBatchKey(command);
    if (!this.batches.has(key)) {
      this.batches.set(key, []);
    }
    this.batches.get(key).push(command);
  }

  flush() {
    this.batches.forEach((commands, key) => {
      this.executeBatch(key, commands);
    });
    this.batches.clear();
  }

  executeBatch(key, commands) {
    // Execute all commands in one GPU call
    switch (key) {
      case "RECT":
        this.batchDrawRects(commands);
        break;
      case "TEXT":
        this.batchDrawText(commands);
        break;
    }
  }
}

// Development mode hot reloading
if (process.env.NODE_ENV === "development") {
  const hotReload = new HotReload();
  hotReload.watch("./src/components", (component) => {
    // Hot reload component without full page refresh
    this.hotReloadComponent(component);
  });
}