render connected tiles

1 files changed, 77 insertions, 0 deletions

diff --git a/light-client/src/tilemap.rs b/light-client/src/tilemap.rs
new file mode 100644
index 00000000..cd0f13ac
--- /dev/null
+++ b/light-client/src/tilemap.rs
@@ -0,0 +1,77 @@
+use crate::sprite_renderer::SpriteRenderer;
+use hurrycurry_protocol::{glam::IVec2, TileIndex};
+use sdl2::rect::{FRect, Rect};
+use std::collections::HashMap;
+
+#[derive(Default)]
+pub struct Tilemap {
+    tile_srcs: Vec<[Rect; 16]>,
+    tiles: HashMap<IVec2, (Rect, FRect)>,
+}
+
+impl Tilemap {
+    pub fn init(&mut self, tile_names: &[String], sprite_rects: &HashMap<String, Rect>) {
+        self.tile_srcs = tile_names
+            .iter()
+            .map(|name| {
+                let fallback = sprite_rects
+                    .get(&format!("{name}+a"))
+                    .copied()
+                    .unwrap_or(Rect::new(0, 0, 0, 0));
+
+                [
+                    sprite_rects.get(&format!("{name}+")),
+                    sprite_rects.get(&format!("{name}+w")),
+                    sprite_rects.get(&format!("{name}+e")),
+                    sprite_rects.get(&format!("{name}+we")),
+                    sprite_rects.get(&format!("{name}+n")),
+                    sprite_rects.get(&format!("{name}+wn")),
+                    sprite_rects.get(&format!("{name}+en")),
+                    sprite_rects.get(&format!("{name}+wen")),
+                    sprite_rects.get(&format!("{name}+s")),
+                    sprite_rects.get(&format!("{name}+ws")),
+                    sprite_rects.get(&format!("{name}+es")),
+                    sprite_rects.get(&format!("{name}+wes")),
+                    sprite_rects.get(&format!("{name}+ns")),
+                    sprite_rects.get(&format!("{name}+wns")),
+                    sprite_rects.get(&format!("{name}+ens")),
+                    sprite_rects.get(&format!("{name}+wens")),
+                ]
+                .map(|e| e.copied().unwrap_or(fallback))
+            })
+            .collect();
+    }
+
+    pub fn set(&mut self, pos: IVec2, tile: Option<TileIndex>, neighbors: [Option<TileIndex>; 4]) {
+        let Some(tile) = tile else {
+            self.tiles.remove(&pos);
+            return;
+        };
+
+        let mut idx = 0;
+        idx |= 0b0100 * (Some(tile) == neighbors[0]) as usize;
+        idx |= 0b0001 * (Some(tile) == neighbors[1]) as usize;
+        idx |= 0b1000 * (Some(tile) == neighbors[2]) as usize;
+        idx |= 0b0010 * (Some(tile) == neighbors[3]) as usize;
+
+        let src = self.tile_srcs[tile.0][idx];
+        self.tiles.insert(
+            pos,
+            (
+                src,
+                FRect::new(
+                    pos.x as f32,
+                    pos.y as f32 + 1. - src.height() as f32 / 24.,
+                    src.width() as f32 / 32.,
+                    src.height() as f32 / 24.,
+                ),
+            ),
+        );
+    }
+
+    pub fn draw(&self, ctx: &mut SpriteRenderer) {
+        for &(src, dst) in self.tiles.values() {
+            ctx.draw(((dst.y + dst.h) * 32.) as i32, src, dst);
+        }
+    }
+}