Camera controls, fix some math; lighting probably broken

src/asset_pipeline.zig

@@ -17,7 +17,7 @@ pub const Texture = struct {
 
 pub const AssetMap = std.hash_map.StringHashMapUnmanaged;
 
-pub fn visitTextures(allocator: std.mem.Allocator) std.hash_map.StringHashMapUnmanaged(Texture) {
+pub fn visitTextures(allocator: std.mem.Allocator) AssetMap(Texture) {
     zstbi.init(allocator);
     defer zstbi.deinit();
 
@@ -153,7 +153,7 @@ fn rearrange(grid_w: u32, grid_h: u32, tile_w: u32, tile_h: u32, inbuf: []const
     }
 }
 
-pub fn deinitTextures(allocator: std.mem.Allocator, map: AssetMap(Texture)) void {
+pub fn deinitTextures(allocator: std.mem.Allocator, map: *AssetMap(Texture)) void {
     var it = map.iterator();
     while (it.next()) |entry| {
         allocator.free(entry.key_ptr.*);