From 350c74bc8ef61833be11bbb2bab6747245e3ae0d Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 23 Aug 2026 00:38:32 -0700
Subject: refactor out content

---
 src/sim/cell/materials/liquid.rs | 75 ----------------------------------------
 1 file changed, 75 deletions(-)
 delete mode 100644 src/sim/cell/materials/liquid.rs

(limited to 'src/sim/cell/materials/liquid.rs')

diff --git a/src/sim/cell/materials/liquid.rs b/src/sim/cell/materials/liquid.rs
deleted file mode 100644
index 6c3bdcd..0000000
--- a/src/sim/cell/materials/liquid.rs
+++ /dev/null
@@ -1,75 +0,0 @@
-use crate::sim::cell_manager::sim::{PostUpdateAction, UpdateCtx};
-
-#[inline]
-pub fn sim_update(ctx: &mut UpdateCtx) -> PostUpdateAction {
-    // if the water can fall, do so
-    if ctx.swap_or_settle(&[
-        (0, 1),
-        (-1 + 2 * ctx.seqno_parity as i32, 1),
-        (1 - 2 * ctx.seqno_parity as i32, 1),
-    ]) == PostUpdateAction::None
-    {
-        return PostUpdateAction::None;
-    }
-
-    // if the water can't fall, check if we can move left or right
-    // these are inverted on parity so that we don't preference a direction
-    let left_target = ctx.get_cell(-1, 0);
-    let can_move_left =
-        left_target.is_some_and(|c| c.material.def().density < ctx.material.density);
-    let right_target = ctx.get_cell(1, 0);
-    let can_move_right =
-        right_target.is_some_and(|c| c.material.def().density < ctx.material.density);
-
-    // we can't move down or to other side, so we're stuck
-    if !can_move_left && !can_move_right {
-        return PostUpdateAction::Settle;
-    }
-
-    // if we can't move left, just move right
-    if !can_move_left {
-        return ctx.swap_or_settle(&[(1, 0)]);
-    }
-    // and vice versa
-    if !can_move_right {
-        return ctx.swap_or_settle(&[(-1, 0)]);
-    }
-
-    // find the closest hole within 20 pixels (TODO optimize)
-    // a hole is any space below us with a lesser density
-    // prevents equidistance stuck state
-    let starting_side = if ctx.seqno_parity == 0 { 1 } else { -1 };
-    for i in 0..20 {
-        let side = if i % 2 == 0 {
-            starting_side
-        } else {
-            -starting_side
-        };
-
-        let offset = side * (1 + i / 2);
-        let hole_target = ctx.get_cell(offset, 1);
-        if let Some(target) = hole_target
-            && target.material.def().density < ctx.material.density
-        {
-            // we identified a hole and we know that the space on this side is open
-            // move toward the hole
-            return ctx.swap_or_settle(&[(side, 0)]);
-        }
-    }
-
-    return PostUpdateAction::Settle;
-
-    // we didn't find a hole, so just move "randomly" on the same surface
-    // TODO when to settle?
-    // let target_x = if !can_move_left {
-    //     1
-    // } else if !can_move_right {
-    //     -1
-    // } else if ctx.seqno_parity % 2 == 1 {
-    //     1
-    // } else {
-    //     -1
-    // };
-
-    // ctx.candidates_swap(&[(target_x, 0)]);
-}
-- 
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