feat: add experimental game engine & demo game, fix ACPI events

2026-03-18 14:26:50 +01:00
parent ffffb6a0c5
commit b5d2cc515c
42 changed files with 2237 additions and 12 deletions
@@ -0,0 +1,87 @@
+/*
+ * input.h
+ * MontaukOS 2D Game Engine - Input State
+ * Keyboard and mouse state tracking across frames
+ * Copyright (c) 2026 Daniel Hammer
+ */
+
+#pragma once
+#include <cstdint>
+#include <montauk/string.h>
+#include <Api/Syscall.hpp>
+
+namespace engine {
+
+// Scancode constants for common keys
+namespace key {
+    static constexpr uint8_t ESC      = 0x01;
+    static constexpr uint8_t W        = 0x11;
+    static constexpr uint8_t A        = 0x1E;
+    static constexpr uint8_t S        = 0x1F;
+    static constexpr uint8_t D        = 0x20;
+    static constexpr uint8_t E        = 0x12;
+    static constexpr uint8_t SPACE    = 0x39;
+    static constexpr uint8_t UP       = 0x48;
+    static constexpr uint8_t DOWN     = 0x50;
+    static constexpr uint8_t LEFT     = 0x4B;
+    static constexpr uint8_t RIGHT    = 0x4D;
+    static constexpr uint8_t ENTER    = 0x1C;
+    static constexpr uint8_t TAB      = 0x0F;
+}
+
+struct InputState {
+    // Key states: true = currently held
+    bool keys[256];
+    // Keys pressed this frame (edge-triggered)
+    bool keys_pressed[256];
+
+    // Mouse
+    int mouse_x = 0;
+    int mouse_y = 0;
+    int mouse_scroll = 0;
+    uint8_t mouse_buttons = 0;
+    uint8_t prev_mouse_buttons = 0;
+
+    void init() {
+        montauk::memset(keys, 0, sizeof(keys));
+        montauk::memset(keys_pressed, 0, sizeof(keys_pressed));
+    }
+
+    // Call at the start of each frame to clear per-frame state
+    void begin_frame() {
+        montauk::memset(keys_pressed, 0, sizeof(keys_pressed));
+        mouse_scroll = 0;
+        prev_mouse_buttons = mouse_buttons;
+    }
+
+    // Process a window event
+    void handle_event(const Montauk::WinEvent& ev) {
+        if (ev.type == 0) { // keyboard
+            // PS/2 scan code set 1: release codes have bit 7 set.
+            // Mask to base scancode so press and release map to the same index.
+            uint8_t sc = ev.key.scancode & 0x7F;
+            if (ev.key.pressed) {
+                if (!keys[sc])
+                    keys_pressed[sc] = true;
+                keys[sc] = true;
+            } else {
+                keys[sc] = false;
+            }
+        } else if (ev.type == 1) { // mouse
+            mouse_x = ev.mouse.x;
+            mouse_y = ev.mouse.y;
+            mouse_scroll = ev.mouse.scroll;
+            mouse_buttons = ev.mouse.buttons;
+        }
+    }
+
+    bool key_held(uint8_t scancode) const { return keys[scancode]; }
+    bool key_just_pressed(uint8_t scancode) const { return keys_pressed[scancode]; }
+
+    bool mouse_clicked() const {
+        return (mouse_buttons & 1) && !(prev_mouse_buttons & 1);
+    }
+    bool mouse_held() const { return mouse_buttons & 1; }
+};
+
+} // namespace engine