From c780095d1b554a318c3ee072e704a2f7e4478ff1 Mon Sep 17 00:00:00 2001
From: Louis Pearson <louispearson@librem.one>
Date: Wed, 19 Jan 2022 01:35:14 -0700
Subject: [PATCH] Planning out circuit logic

---
 assets/maps/test.json |   2 +-
 assets/maps/test.tmx  |   4 +-
 src/circuit.zig       | 141 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 144 insertions(+), 3 deletions(-)
 create mode 100644 src/circuit.zig

diff --git a/assets/maps/test.json b/assets/maps/test.json
index a65a585..174574f 100644
--- a/assets/maps/test.json
+++ b/assets/maps/test.json
@@ -15,7 +15,7 @@
          "y":0
         }, 
         {
-         "data":[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 129, 153, 0, 0, 0, 0, 0, 0, 154, 153, 0, 0, 0, 0, 0, 0, 154, 130, 0, 0, 135, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 131, 146, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 129, 153, 0, 0, 0, 0, 0, 0, 154, 179, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+         "data":[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 162, 153, 0, 0, 0, 0, 0, 0, 154, 153, 0, 0, 0, 0, 0, 0, 154, 130, 0, 0, 135, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 131, 164, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 129, 153, 0, 0, 0, 0, 0, 0, 154, 179, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
          "height":20,
          "id":2,
          "name":"conduit",
diff --git a/assets/maps/test.tmx b/assets/maps/test.tmx
index 10b5e51..543fbee 100644
--- a/assets/maps/test.tmx
+++ b/assets/maps/test.tmx
@@ -32,9 +32,9 @@
   <data encoding="csv">
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,129,153,0,0,0,0,0,0,154,153,0,0,0,0,0,0,154,130,0,
+0,162,153,0,0,0,0,0,0,154,153,0,0,0,0,0,0,154,130,0,
 0,135,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,132,0,
-131,146,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,132,0,
+131,164,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,132,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,132,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,132,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,132,0,
diff --git a/src/circuit.zig b/src/circuit.zig
new file mode 100644
index 0000000..887edf9
--- /dev/null
+++ b/src/circuit.zig
@@ -0,0 +1,141 @@
+const std = @import("std");
+const assets = @import("assets");
+
+fn is_circuit(tile: u8) bool {
+    return is_plug(tile) or is_conduit(tile) or is_switch(tile);
+}
+
+fn is_plug(tile: u8) bool {
+    return (tile >= 149 and tile <= 153) or tile == 147;
+}
+
+fn is_conduit(tile: u8) bool {
+    return (tile >= 128 and tile < 132) or
+        (tile >= 144 and tile < 148) or
+        (tile >= 160 and tile < 164) or
+        (tile >= 176 and tile < 180);
+}
+
+fn is_switch(tile: u8) bool {
+    return tile >= 134 and tile < 136;
+}
+
+const Side = enum(u2) { up, right, down, left };
+fn side(s: Side) u2 {
+    return @enumToInt(s);
+}
+
+const Current = [4]bool;
+/// Returns sides that can conduct current
+fn get_inputs(tile: u8) Current {
+    return switch (tile) {
+        // Corners
+        128 => .{ false, true, true, false },
+        129 => .{ false, false, true, true },
+        144 => .{ true, false, false, true },
+        145 => .{ true, true, false, false },
+        // Straight
+        130 => .{ false, true, false, true },
+        131 => .{ true, false, true, false },
+        // Cross
+        146 => .{ false, false, false, false },
+        147 => .{ true, true, true, true },
+        // Ends
+        160 => .{ false, false, true, false },
+        161 => .{ false, true, false, false },
+        162 => .{ true, false, false, false },
+        163 => .{ false, false, false, true },
+        // Tees
+        176 => .{ false, true, true, true },
+        177 => .{ true, true, false, true },
+        178 => .{ true, false, true, true },
+        179 => .{ true, true, true, false },
+        // Plugs
+        149 => .{ false, false, true, false },
+        150 => .{ true, false, false, false },
+        151 => .{ false, false, false, true },
+        152 => .{ false, true, false, false },
+        // Closed switch
+        134 => .{ true, false, true, false },
+        else => .{ false, false, false, false },
+    };
+}
+
+const Plugs = [4]bool;
+/// Returns sides where wires may be plugged
+fn get_plugs(tile: u8) Plugs {
+    return switch (tile) {
+        // Plugs
+        149 => .{ true, false, false, false },
+        150 => .{ false, false, true, false },
+        151 => .{ false, true, false, false },
+        152 => .{ false, false, false, true },
+        // Cross
+        146 => .{ true, true, true, true },
+        else => .{ false, false, false, false },
+    };
+}
+
+const Signals = [4]bool;
+/// Returns sides where a signal may be sent
+fn get_signals(tile: u8) Signals {
+    return switch (tile) {
+        // Ends
+        160 => .{ true, true, false, true },
+        161 => .{ true, false, true, true },
+        162 => .{ false, true, true, true },
+        163 => .{ true, true, true, false },
+        // Switches
+        134 => .{ true, false, true, false },
+        135 => .{ true, false, true, false },
+        else => .{ false, false, false, false },
+    };
+}
+
+const Vec2 = std.meta.Vector(2, i32);
+const Cell = Vec2;
+fn dir(s: Side) Cell {
+    return switch (s) {
+        .up => Vec2{ 0, -1 },
+        .down => Vec2{ 0, 1 },
+        .left => Vec2{ -1, 0 },
+        .right => Vec2{ 1, 0 },
+    };
+}
+
+fn get_cell(c: Cell) ?u8 {
+    if (c[0] < 0 or c[0] >= 20 or c[1] >= 20 or c[1] < 0) return null;
+    const i = @intCast(usize, (c[0] % 20) + (c[1] * 20));
+    return assets.conduit[i];
+}
+
+fn index2cell(i: usize) Cell {
+    return Vec2{ i % 20, @divTrunc(i, 20) };
+}
+
+pub const Circuit = struct {
+    switches: std.BoundedArray(8, cell),
+    plugs: std.BoundedArray(8, cell),
+    enabled: bool = false,
+};
+
+pub fn createCircuitChunks() void {
+    var items = std.BoundedArray(100, u8).init(0);
+    for (assets.conduit) |tile, i| {
+        if (is_circuit(tile)) items.append(index2cell(i));
+    }
+    for (items.slice()) |cell| {
+        // TODO: iterate over the cells and create components
+    }
+}
+
+var circuits = std.BoundedArray(20, Circuit).init(0);
+pub fn toggleSwitch(cell: Cell) void {
+    for (circuits) |circuit| {
+        for (circuit.switches) |switchCell| {
+            if (switchCell == cell) {
+                // TODO: do a search and disable circuit if a source is not found
+            }
+        }
+    }
+}