From d5fd02d8eb387b477678ffbfb44303a38c105607 Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Thu, 24 Apr 2025 12:25:33 -0700
Subject: Some draft ideas on simulation

---
 src/sandbox.hpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/sandbox.hpp

(limited to 'src/sandbox.hpp')

diff --git a/src/sandbox.hpp b/src/sandbox.hpp
new file mode 100644
index 0000000..c6453c7
--- /dev/null
+++ b/src/sandbox.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "pcg.hpp"
+
+#include <cstdint>
+#include <vector>
+
+const int MBIT_DISPLACABLE = 1;
+
+struct Tile {
+    enum Material : unsigned char {
+        AIR = 0,
+        SOLID,
+        SAND,
+        WATER,
+    };
+
+    Material mat;
+    uint8_t pressure = 0;
+    bool updated = false;
+
+    uint32_t get_color() const;
+};
+
+struct Sandbox {
+    std::vector<uint32_t> _bitmap;
+    std::vector<Tile> _a;
+    Pcg32 _pcg;
+    Tile _solid_tile;
+    int width, height;
+    int ncycle = 0;
+
+    Sandbox(int w, int h);
+
+    void simulate_step();
+
+    Tile& gs(int x, int y);
+    void set_sand(int x, int y, Tile sand);
+    void shift_sand(int x, int y);
+
+    // std::vector<uint32_t> to_bitmap() const;
+};
-- 
cgit v1.2.3-70-g09d2