From 2089d501882f927f8d8dd932dd1b167f722ae1cd Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 28 Mar 2021 21:43:24 -0400
Subject: [WIP] map: Merge wall tiles into hor/vert lines

---
diff --git a/src/map.c b/src/map.c
index f33782f..0a093ee 100644
--- a/src/map.c
+++ b/src/map.c
@@ -32,6 +32,11 @@
 #include "output.h"
 #include "xml.h"
 
+struct db_wall {
+	SDL_Rect rect;
+	struct db_wall *next;
+};
+
 struct db_map_layer {
 	Uint32              *tiles;
 	char                *encoding;
@@ -74,7 +79,8 @@ struct db_map {
 	struct db_ball      *ball_head;
 	struct db_ball      *ball_tail;
 	Uint8               *p_col;
-	Uint8               *b_col;
+	struct db_wall      *wall_head;
+	struct db_wall      *wall_tail;
 };
 
 static char *
@@ -771,6 +777,9 @@ _db_map_set_collision_tiles(struct db_map *map)
 	struct db_map_layer *layer;
 	int                  i;
 	int                  gid;
+	Uint8               *b_col;
+	int                  x;
+	int                  y;
 
 	db_dbg("Allocating %d bit field elements", (map->w * map->h + 7) / 8);
 	map->p_col = calloc((map->w * map->h + 7) / 8, sizeof(*map->p_col));
@@ -778,8 +787,8 @@ _db_map_set_collision_tiles(struct db_map *map)
 		db_err("Failed to allocate memory");
 		return;
 	}
-	map->b_col = calloc((map->w * map->h + 7) / 8, sizeof(*map->p_col));
-	if (map->b_col == NULL) {
+	b_col = calloc((map->w * map->h + 7) / 8, sizeof(*map->p_col));
+	if (b_col == NULL) {
 		db_err("Failed to allocate memory");
 		free(map->p_col);
 		return;
@@ -798,7 +807,31 @@ _db_map_set_collision_tiles(struct db_map *map)
 				map->p_col[i / 8] |= 1 << (i % 8);
 			}
 			if (db_tile_ball_collides(map->tileset_head, gid)) {
-				map->b_col[i / 8] |= 1 << (i % 8);
+				b_col[i / 8] |= 1 << (i % 8);
+			}
+		}
+	}
+
+	for (y = 0; y < map->h; ++y) {
+		for (x = 0; x < map->w; ++x) {
+			i = y * map->w + x;
+			if ((b_col[i / 8] & (1 << (i % 8))) != 0) {
+				if (x > 0 && map->walls[i] != NULL) {
+					++map->walls[i - 1].rect.w;
+					map->walls[i] = map->walls[i - 1];
+					continue;
+				}
+				map->wall_tail = calloc(1,
+						sizeof(*map->wall_tail));
+				if (map->wall_tail == NULL) {
+					db_err("Failed to allocate memory");
+					free(map->p_col);
+					free(b_col);
+					return;
+				}
+				if (map->wall_head == NULL) {
+					map->wall_head = map->wall_tail;
+				}
 			}
 		}
 	}
--
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