From 582074256cb129d1b297258556f40834f9996355 Mon Sep 17 00:00:00 2001
From: Klemen Plestenjak <plestenjak.klemen@gmail.com>
Date: Wed, 13 Dec 2023 16:23:38 +0100
Subject: [PATCH] Add animations to terrain layer

---
 engine/breeze/map/map.c |  5 ++++-
 game/main.c             | 33 ++++++++++++++++++++++++++++++++-
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/engine/breeze/map/map.c b/engine/breeze/map/map.c
index 222ef3c..28d93f2 100644
--- a/engine/breeze/map/map.c
+++ b/engine/breeze/map/map.c
@@ -465,7 +465,10 @@ void bzTileMapDraw(BzTileMap *map) {
         if (layer->tilesetIdx != -1) {
             tileset = map->tilesets + layer->tilesetIdx;
         }
-        drawLayer(map->layers + i, tileset);
+        if (layer->desc.renderer)
+            layer->desc.renderer(map, layer);
+        else
+            drawLayer(map->layers + i, tileset);
     }
 
     for (i32 i = 0; i < map->objectGroupCount; i++) {
diff --git a/game/main.c b/game/main.c
index 6751ad8..225ba60 100644
--- a/game/main.c
+++ b/game/main.c
@@ -46,6 +46,37 @@ bool bzMain(BzAppDesc *appDesc, int argc, const char **argv) {
     return true;
 }
 
+void terrainRender(BzTileMap *map, BzTileLayer *layer) {
+    BzTileset *tileset = bzTileLayerGetTileset(map, layer);
+
+
+    Vector2 drawPos = {layer->offsetX, layer->offsetY};
+
+    static f32 elapsed = 0.0f;
+    elapsed += GetFrameTime();
+
+    for (i32 y = 0; y < layer->height; y++) {
+        for (i32 x = 0; x < layer->width; x++) {
+            BzTile tile = bzTileLayerGetTile(layer, x, y);
+            tile        = bzTilesetGetTile(tileset, tile);
+            if (tile != -1) {
+                if (terrainHasAnimation(tile)) {
+                    f32 frameDuration = terrainGetAnimationFrame(tile, 0).duration / 1000.0f;
+                    i32 numFrames     = terrainGetAnimationSequence(tile).frameCount;
+                    i32 frameIdx = (i32) (elapsed / frameDuration) % numFrames;
+                    tile = terrainGetAnimationFrame(tile, frameIdx).frame;
+                }
+                tile += tileset->startID;
+                Rectangle rec = bzTilesetGetTileRegion(tileset, tile);
+                DrawTextureRec(tileset->tiles, rec, drawPos, WHITE);
+            }
+            drawPos.x += (float) tileset->tileWidth;
+        }
+        drawPos.x = layer->offsetX;
+        drawPos.y += (float) tileset->tileHeight;
+    }
+}
+
 bool init(void *userData) {
     BZ_UNUSED(userData);
     SetExitKey(0);
@@ -103,7 +134,7 @@ bool init(void *userData) {
         .generateCollisionMap=true,
         .tilesets[0]=game->tileset,
 
-        .layers[LAYER_TERRAIN]=(BzTileLayerDesc) {"terrain", .applyColliders=true},
+        .layers[LAYER_TERRAIN]=(BzTileLayerDesc) {"terrain", .renderer=terrainRender, .applyColliders=true},
         .layers[LAYER_ROCKS]=(BzTileLayerDesc) {"rocks"},
         .layers[LAYER_ROCKS2]=(BzTileLayerDesc) {"rocks_s"},
         .layers[LAYER_TREES]=(BzTileLayerDesc) {"trees"},