Fix transparent blocks

common/everything_registry.ts

@@ -93,10 +93,18 @@ interface BlockStateVariant {
 	y: number;
 }
 
+// solid: fully opaque. cutout: texels are either opaque or see-through (leaves).
+// translucent: blended and sorted back to front (water, glass)
+export const RENDER_LAYERS = ["solid", "cutout", "translucent"] as const;
+export type RenderLayer = typeof RENDER_LAYERS[number];
+
 export interface BlockRegistry {
 	id: string;
 	textures: string | TextureSideTopBottom | TextureFront;
-	transparent?: boolean;
+	// solid when not set. anything else doesn't hide its neighbors' faces
+	render_layer?: RenderLayer;
+	// hide faces between two of this block, like glass and water. defaults to true for translucent blocks
+	cull_same?: boolean;
 	alpha?: number;
 
 	has_collision: boolean;