src/coral/coral.zig

@@ -10,6 +10,8 @@ pub const heap = @import("./heap.zig");
 
 pub const io = @import("./io.zig");
 
+pub const lina = @import("./lina.zig");
+
 pub const map = @import("./map.zig");
 
 pub const scalars = @import("./scalars.zig");
@@ -22,8 +24,6 @@ const std = @import("std");
 
 pub const utf8 = @import("./utf8.zig");
 
-pub const vectors = @import("./vectors.zig");
-
 pub fn Pool(comptime Value: type) type {
 	return struct {
 		entries: stack.Sequential(Entry),

src/coral/lina.zig

@@ -1,5 +1,18 @@
 const std = @import("std");
 
+pub fn Matrix(comptime n: usize, comptime Element: type) type {
+	return [n]@Vector(n, Element);
+}
+
+pub const ProjectionMatrix = Matrix(4, f32);
+
+pub const Rect = struct {
+	left: f32,
+	top: f32,
+	right: f32,
+	bottom: f32,
+};
+
 pub fn cross(v1: anytype, v2: anytype) @typeInfo(@TypeOf(v1, v2)).Vector.child {
 	const multipled = v1 * v2;
 	const vector_info = @typeInfo(@TypeOf(v1)).Vector;
@@ -48,3 +61,16 @@ pub fn normal(v: anytype) @TypeOf(v) {
 
 	return v;
 }
+
+pub fn orthographic_projection(near: f32, far: f32, viewport: Rect) Matrix(4, f32) {
+	const width = viewport.right - viewport.left;
+	const height = viewport.bottom - viewport.top;
+
+	return .{
+		.{2 / width, 0, 0, 0},
+		.{0, 2 / height, 0, 0},
+		.{0, 0, 1 / (far - near), 0},
+		.{-((viewport.left + viewport.right) / width), -((viewport.top + viewport.bottom) / height), near / (near - far), 1},
+	};
+}
+

src/flow/World.zig

@@ -1,5 +1,7 @@
 const builtin = @import("builtin");
 
+const flow = @import("./flow.zig");
+
 const coral = @import("coral");
 
 const states = @import("./states.zig");
@@ -19,7 +21,7 @@ const Self = @This();
 pub fn create_event(self: *Self, label: []const u8) std.mem.Allocator.Error!Event {
 	var systems = try system.Schedule.init(label);
 
-	errdefer systems.deinit();
+	errdefer systems.deinit(self);
 
 	const index = self.event_systems.len();
 
@@ -34,7 +36,7 @@ pub fn deinit(self: *Self) void {
 	}
 
 	for (self.event_systems.values) |*schedule| {
-		schedule.deinit();
+		schedule.deinit(self);
 	}
 
 	if (self.thread_pool) |thread_pool| {
@@ -47,11 +49,19 @@ pub fn deinit(self: *Self) void {
 	self.* = undefined;
 }
 
-pub fn get_resource(self: Self, comptime State: type) ?*State {
+pub fn get_params(self: Self, comptime Value: type) flow.Params(Value) {
-	return @ptrCast(@alignCast(self.thread_restricted_resources[@intFromEnum(states.thread_restriction(State))].get(State)));
+	const params = self.get_state(flow.Params(Value)) orelse {
+		return .{};
+	};
+
+	return params.*;
 }
 
-pub fn set_get_resource(self: *Self, value: anytype) std.mem.Allocator.Error!*@TypeOf(value) {
+pub fn get_state(self: Self, comptime Value: type) ?*Value {
+	return @ptrCast(@alignCast(self.thread_restricted_resources[@intFromEnum(states.thread_restriction(Value))].get(Value)));
+}
+
+pub fn set_get_state(self: *Self, value: anytype) std.mem.Allocator.Error!*@TypeOf(value) {
 	return self.thread_restricted_resources[@intFromEnum(states.thread_restriction(@TypeOf(value)))].set_get(value);
 }
 
@@ -83,6 +93,6 @@ pub fn run_event(self: *Self, event: Event) anyerror!void {
 	try self.event_systems.values[@intFromEnum(event)].run(self);
 }
 
-pub fn set_resource(self: *Self, value: anytype) std.mem.Allocator.Error!void {
+pub fn set_state(self: *Self, value: anytype) std.mem.Allocator.Error!void {
 	try self.thread_restricted_resources[@intFromEnum(states.thread_restriction(@TypeOf(value)))].set(value);
 }

src/flow/flow.zig

@@ -6,6 +6,45 @@ pub const system = @import("./system.zig");
 
 pub const World = @import("./World.zig");
 
+pub const Exclusive = struct {
+	world: *World,
+
+	pub const Param = struct {
+		world: *World,
+	};
+
+	pub fn bind(context: system.BindContext) std.mem.Allocator.Error!Param {
+		return .{
+			.world = context.world,
+		};
+	}
+
+	pub fn init(param: *Param) Exclusive {
+		return .{
+			.world = param.world,
+		};
+	}
+
+	pub const thread_restriction = .main;
+};
+
+pub fn Params(comptime Value: type) type {
+	if (!@hasDecl(Value, "Param")) {
+		@compileError("System parameters must have a Params type declaration");
+	}
+
+	return struct {
+		has_head: ?*Node = null,
+		has_tail: ?*Node = null,
+
+		pub const Node = struct {
+			param: Value.Param,
+			has_prev: ?*Node = null,
+			has_next: ?*Node = null,
+		};
+	};
+}
+
 pub fn Read(comptime Value: type) type {
 	return Shared(Value, .{
 		.thread_restriction = states.thread_restriction(Value),
@@ -58,19 +97,19 @@ pub fn Shared(comptime Value: type, comptime info: ShareInfo) type {
 
 		const Self = @This();
 
-		pub const State = struct {
+		pub const Param = struct {
 			res: Qualified,
 		};
 
-		pub fn bind(context: system.BindContext) std.mem.Allocator.Error!State {
+		pub fn bind(context: system.BindContext) std.mem.Allocator.Error!Param {
 			const thread_restriction_name = switch (info.thread_restriction) {
 				.main => "main thread-restricted ",
 				.none => ""
 			};
 
 			const res = switch (info.read_only) {
-				true => (try context.register_readable_resource_access(Value)),
+				true => (try context.register_readable_state_access(Value)),
-				false => (try context.register_writable_resource_access(Value)),
+				false => (try context.register_writable_state_access(Value)),
 			};
 
 			return .{
@@ -88,9 +127,9 @@ pub fn Shared(comptime Value: type, comptime info: ShareInfo) type {
 			};
 		}
 
-		pub fn init(state: *State) Self {
+		pub fn init(param: *Param) Self {
 			return .{
-				.res = state.res,
+				.res = param.res,
 			};
 		}
 	};
@@ -104,60 +143,71 @@ pub fn Write(comptime Value: type) type {
 }
 
 fn parameter_type(comptime Value: type) *const system.Info.Parameter {
-	const has_state = @hasDecl(Value, "State");
+	const ValueParams = Params(Value);
 
 	if (@sizeOf(Value) == 0) {
 		@compileError("System parameters must have a non-zero size");
 	}
 
 	const parameters = struct {
-		fn bind(allocator: std.mem.Allocator, context: system.BindContext) std.mem.Allocator.Error!?*anyopaque {
+		fn bind(allocator: std.mem.Allocator, context: system.BindContext) std.mem.Allocator.Error!*anyopaque {
-			if (has_state) {
+			const value_name = @typeName(Value);
-				const value_name = @typeName(Value);
 
-				if (!@hasDecl(Value, "bind")) {
+			if (!@hasDecl(Value, "bind")) {
-					@compileError(
+				@compileError(
-						"a `bind` declaration on " ++
+					"a `bind` declaration on " ++
-						value_name ++
+					value_name ++
-						" is requied for parameter types with a `State` declaration");
+					" is requied for parameter types with a `Param` declaration");
-				}
-
-				const bind_type = @typeInfo(@TypeOf(Value.bind));
-
-				if (bind_type != .Fn) {
-					@compileError("`bind` declaration on " ++ value_name ++ " must be a fn");
-				}
-
-				if (bind_type.Fn.params.len != 1 or bind_type.Fn.params[0].type.? != system.BindContext) {
-					@compileError(
-						"`bind` fn on " ++
-						value_name ++
-						" must accept " ++
-						@typeName(system.BindContext) ++
-						" as it's one and only argument");
-				}
-
-				const state = try allocator.create(Value.State);
-
-				state.* = switch (bind_type.Fn.return_type.?) {
-					Value.State => Value.bind(context),
-					std.mem.Allocator.Error!Value.State => try Value.bind(context),
-					else => @compileError(
-						"`bind` fn on " ++
-						@typeName(Value) ++
-						" must return " ++
-						@typeName(Value.State) ++
-						" or " ++
-						@typeName(std.mem.Allocator.Error!Value.State)),
-				};
-
-				return @ptrCast(state);
-			} else {
-				return null;
 			}
+
+			const bind_type = @typeInfo(@TypeOf(Value.bind));
+
+			if (bind_type != .Fn) {
+				@compileError("`bind` declaration on " ++ value_name ++ " must be a fn");
+			}
+
+			if (bind_type.Fn.params.len != 1 or bind_type.Fn.params[0].type.? != system.BindContext) {
+				@compileError(
+					"`bind` fn on " ++
+					value_name ++
+					" must accept " ++
+					@typeName(system.BindContext) ++
+					" as it's one and only argument");
+			}
+
+			const params_node = try allocator.create(ValueParams.Node);
+
+			params_node.* = .{
+				.param = switch (bind_type.Fn.return_type.?) {
+					Value.Param => Value.bind(context),
+					std.mem.Allocator.Error!Value.Param => try Value.bind(context),
+
+					else => @compileError(std.fmt.comptimePrint("`bind` fn on {s} must return {s} or {s}", .{
+						@typeName(Value),
+						@typeName(Value.Param),
+						@typeName(std.mem.Allocator.Error!Value.Param)
+					})),
+				},
+			};
+
+			if (context.world.get_state(ValueParams)) |value_params| {
+				if (value_params.has_tail) |tail| {
+					tail.has_next = params_node;
+				}
+
+				params_node.has_prev = value_params.has_tail;
+				value_params.has_tail = params_node;
+			} else {
+				try context.world.set_state(ValueParams{
+					.has_head = params_node,
+					.has_tail = params_node,
+				});
+			}
+
+			return @ptrCast(params_node);
 		}
 
-		fn init(argument: *anyopaque, state: ?*anyopaque) void {
+		fn init(argument: *anyopaque, erased_node: *anyopaque) void {
 			const value_name = @typeName(Value);
 
 			if (!@hasDecl(Value, "init")) {
@@ -176,31 +226,37 @@ fn parameter_type(comptime Value: type) *const system.Info.Parameter {
 
 			const concrete_argument = @as(*Value, @ptrCast(@alignCast(argument)));
 
-			if (has_state) {
+			if (init_type.Fn.params.len != 1 or init_type.Fn.params[0].type.? != *Value.Param) {
-				if (init_type.Fn.params.len != 1 or init_type.Fn.params[0].type.? != *Value.State) {
+				@compileError("`init` fn on " ++ value_name ++ " must accept a " ++ @typeName(*Value.Param));
-					@compileError("`init` fn on stateful " ++ value_name ++ " must accept a " ++ @typeName(*Value.State));
-				}
-
-				concrete_argument.* = Value.init(@ptrCast(@alignCast(state.?)));
-			} else {
-				if (init_type.Fn.params.len != 0) {
-					@compileError("`init` fn on statelss " ++ value_name ++ " cannot use parameters");
-				}
-
-				concrete_argument.* = Value.init();
 			}
+
+			concrete_argument.* = Value.init(&@as(*ValueParams.Node, @ptrCast(@alignCast(erased_node))).param);
 		}
 
-		fn unbind(allocator: std.mem.Allocator, state: ?*anyopaque) void {
+		fn unbind(allocator: std.mem.Allocator, erased_node: *anyopaque, context: system.UnbindContext) void {
 			if (@hasDecl(Value, "unbind")) {
-				if (has_state) {
+				const node = @as(*ValueParams.Node, @ptrCast(@alignCast(erased_node)));
-					const typed_state = @as(*Value.State, @ptrCast(@alignCast(state.?)));
 
-					Value.unbind(typed_state);
+				if (node.has_prev) |prev| {
-					allocator.destroy(typed_state);
+					prev.has_next = node.has_next;
-				} else {
-					Value.unbind();
 				}
+
+				if (node.has_next) |next| {
+					next.has_prev = node.has_prev;
+				}
+
+				if (context.world.get_state(ValueParams)) |params| {
+					if (node.has_prev == null) {
+						params.has_head = node.has_next;
+					}
+
+					if (node.has_next == null) {
+						params.has_tail = node.has_prev;
+					}
+				}
+
+				Value.unbind(node);
+				allocator.destroy(node);
 			}
 		}
 	};
@@ -224,7 +280,7 @@ pub fn system_fn(comptime call: anytype) *const system.Info {
 				}
 
 				const systems = struct {
-					fn run(parameters: []const *const system.Info.Parameter, data: *const [system.max_parameters]?*anyopaque) anyerror!void {
+					fn run(parameters: []const *const system.Info.Parameter, data: *const [system.max_parameters]*anyopaque) anyerror!void {
 						var call_args = @as(std.meta.ArgsTuple(Call), undefined);
 
 						inline for (parameters, &call_args, data[0 .. parameters.len]) |parameter, *call_arg, state| {

src/flow/system.zig

@@ -37,8 +37,8 @@ pub const BindContext = struct {
 		return false;
 	}
 
-	pub fn register_writable_resource_access(self: BindContext, comptime Resource: type) std.mem.Allocator.Error!?*Resource {
+	pub fn register_writable_state_access(self: BindContext, comptime Resource: type) std.mem.Allocator.Error!?*Resource {
-		const value = self.world.get_resource(Resource) orelse {
+		const value = self.world.get_state(Resource) orelse {
 			return null;
 		};
 
@@ -65,8 +65,8 @@ pub const BindContext = struct {
 		return value;
 	}
 
-	pub fn register_readable_resource_access(self: BindContext, comptime Resource: type) std.mem.Allocator.Error!?*const Resource {
+	pub fn register_readable_state_access(self: BindContext, comptime Resource: type) std.mem.Allocator.Error!?*const Resource {
-		const value = self.world.get_resource(Resource) orelse {
+		const value = self.world.get_state(Resource) orelse {
 			return null;
 		};
 
@@ -95,16 +95,16 @@ pub const BindContext = struct {
 };
 
 pub const Info = struct {
-	execute: *const fn ([]const *const Parameter, *const [max_parameters]?*anyopaque) anyerror!void,
+	execute: *const fn ([]const *const Parameter, *const [max_parameters]*anyopaque) anyerror!void,
 	parameters: [max_parameters]*const Parameter = undefined,
 	parameter_count: u4 = 0,
 	thread_restriction: states.ThreadRestriction = .none,
 
 	pub const Parameter = struct {
 		thread_restriction: states.ThreadRestriction,
-		init: *const fn (*anyopaque, ?*anyopaque) void,
+		init: *const fn (*anyopaque, *anyopaque) void,
-		bind: *const fn (std.mem.Allocator, BindContext) std.mem.Allocator.Error!?*anyopaque,
+		bind: *const fn (std.mem.Allocator, BindContext) std.mem.Allocator.Error!*anyopaque,
-		unbind: *const fn (std.mem.Allocator, ?*anyopaque) void,
+		unbind: *const fn (std.mem.Allocator, *anyopaque, UnbindContext) void,
 	};
 
 	pub fn used_parameters(self: *const Info) []const *const Parameter {
@@ -142,7 +142,7 @@ pub const Schedule = struct {
 		info: *const Info,
 		label: [:0]u8,
 		dependencies: []Dependency,
-		parameter_states: [max_parameters]?*anyopaque = [_]?*anyopaque{null} ** max_parameters,
+		parameter_states: [max_parameters]*anyopaque = [_]*anyopaque{undefined} ** max_parameters,
 		resource_accesses: coral.stack.Sequential(ResourceAccess),
 	});
 
@@ -157,7 +157,7 @@ pub const Schedule = struct {
 
 	const ResourceNodeBundle = coral.map.Hashed(states.TypeID, NodeBundle, coral.map.enum_traits(states.TypeID));
 
-	pub fn deinit(self: *Schedule) void {
+	pub fn deinit(self: *Schedule, world: *World) void {
 		{
 			var nodes = self.system_id_nodes.entries();
 
@@ -188,7 +188,9 @@ pub const Schedule = struct {
 			const system = self.graph.get_ptr(node).?;
 
 			for (system.info.used_parameters(), system.parameter_states[0 .. system.info.parameter_count]) |parameter, state| {
-				parameter.unbind(self.arena.allocator(), state);
+				parameter.unbind(self.arena.allocator(), state, .{
+					.world = world,
+				});
 			}
 
 			system.resource_accesses.deinit();
@@ -467,9 +469,9 @@ pub const Schedule = struct {
 
 		errdefer {
 			for (info.used_parameters(), system.parameter_states[0 .. info.parameter_count]) |parameter, state| {
-				if (state) |initialized_state| {
+				parameter.unbind(self.arena.allocator(), state, .{
-					parameter.unbind(self.arena.allocator(), initialized_state);
+					.world = world,
-				}
+				});
 			}
 
 			std.debug.assert(self.graph.remove_node(node) != null);
@@ -489,4 +491,8 @@ pub const Schedule = struct {
 	}
 };
 
+pub const UnbindContext = struct {
+	world: *World,
+};
+
 pub const max_parameters = 16;

src/main.zig

@@ -80,10 +80,14 @@ fn render(commands: ona.gfx.Commands, actors: ona.Write(Actors), app: ona.Read(o
 		},
 	});
 
-	try commands.set_effect(actors.res.crt_effect, CRT{
+	try commands.set_effect(.{
-		.width = 1280,
+		.effect = actors.res.crt_effect,
-		.height = 720,
+
-		.time = @floatCast(app.res.elapsed_time),
+		.properties = std.mem.asBytes(&CRT{
+			.width = 1280,
+			.height = 720,
+			.time = @floatCast(app.res.elapsed_time),
+		}),
 	});
 
 	try commands.set_target(.{
@@ -112,8 +116,8 @@ fn update(player: ona.Read(Player), actors: ona.Write(Actors), mapping: ona.Read
 }
 
 fn setup(world: *ona.World, events: ona.App.Events) !void {
-	try world.set_resource(Actors{});
+	try world.set_state(Actors{});
-	try world.set_resource(Player{});
+	try world.set_state(Player{});
 
 	try world.on_event(events.load, ona.system_fn(load), .{.label = "load"});
 	try world.on_event(events.update, ona.system_fn(update), .{.label = "update"});

src/ona/act.zig

@@ -38,7 +38,7 @@ pub const Mapping = struct {
 };
 
 pub fn setup(world: *flow.World, events: App.Events) std.mem.Allocator.Error!void {
-	try world.set_resource(Mapping{});
+	try world.set_state(Mapping{});
 
 	try world.on_event(events.pre_update, flow.system_fn(update), .{
 		.label = "update act",

src/ona/gfx.zig

@@ -10,15 +10,9 @@ const ext = @import("./ext.zig");
 
 const flow = @import("flow");
 
-const handles = @import("./gfx/handles.zig");
-
-pub const lina = @import("./gfx/lina.zig");
-
 const msg = @import("./msg.zig");
 
-const spirv = @import("./gfx/spirv.zig");
+const sokol = @import("./gfx/sokol.zig");
-
-const rendering = @import("./gfx/rendering.zig");
 
 const std = @import("std");
 
@@ -26,6 +20,8 @@ pub const Assets = struct {
 	window: *ext.SDL_Window,
 	texture_formats: coral.stack.Sequential(TextureFormat),
 	frame_rendered: std.Thread.ResetEvent = .{},
+	pending_work: WorkQueue = .{},
+	has_worker_thread: ?std.Thread = null,
 
 	pub const LoadError = std.mem.Allocator.Error;
 
@@ -38,9 +34,51 @@ pub const Assets = struct {
 		load_file: *const fn (*std.heap.ArenaAllocator, coral.files.Storage, []const u8) LoadFileError!Texture.Desc,
 	};
 
+	pub const WorkQueue = coral.asyncio.BlockingQueue(1024, union (enum) {
+		load_effect: LoadEffectWork,
+		load_texture: LoadTextureWork,
+		render_frame: RenderFrameWork,
+		shutdown,
+		unload_effect: UnloadEffectWork,
+		unload_texture: UnloadTextureWork,
+
+		const LoadEffectWork = struct {
+			desc: Effect.Desc,
+			loaded: *coral.asyncio.Future(std.mem.Allocator.Error!Effect),
+		};
+
+		const LoadTextureWork = struct {
+			desc: Texture.Desc,
+			loaded: *coral.asyncio.Future(std.mem.Allocator.Error!Texture),
+		};
+
+		const RenderFrameWork = struct {
+			clear_color: Color,
+			width: u16,
+			height: u16,
+			finished: *std.Thread.ResetEvent,
+			has_command_params: ?*flow.Params(Commands).Node,
+		};
+
+		const UnloadEffectWork = struct {
+			handle: Effect,
+		};
+
+		const UnloadTextureWork = struct {
+			handle: Texture,
+		};
+	});
+
 	fn deinit(self: *Assets) void {
-		rendering.enqueue_work(.shutdown);
+		self.pending_work.enqueue(.shutdown);
+
+		if (self.has_worker_thread) |worker_thread| {
+			worker_thread.join();
+		}
+
 		self.texture_formats.deinit();
+
+		self.* = undefined;
 	}
 
 	fn init() !Assets {
@@ -59,15 +97,13 @@ pub const Assets = struct {
 			ext.SDL_DestroyWindow(window);
 		}
 
-		try rendering.startup(window);
-
 		return .{
 			.texture_formats = .{.allocator = coral.heap.allocator},
 			.window = window,
 		};
 	}
 
-	pub fn load_effect_file(_: *Assets, storage: coral.files.Storage, path: []const u8) LoadFileError!Effect {
+	pub fn load_effect_file(self: *Assets, storage: coral.files.Storage, path: []const u8) LoadFileError!Effect {
 		if (!std.mem.endsWith(u8, path, ".spv")) {
 			return error.FormatUnsupported;
 		}
@@ -85,7 +121,7 @@ pub const Assets = struct {
 
 		var loaded = coral.asyncio.Future(std.mem.Allocator.Error!Effect){};
 
-		rendering.enqueue_work(.{
+		self.pending_work.enqueue(.{
 			.load_effect = .{
 				.desc = .{
 					.fragment_spirv_ops = fragment_spirv_ops,
@@ -98,10 +134,10 @@ pub const Assets = struct {
 		return loaded.get().*;
 	}
 
-	pub fn load_texture(_: *Assets, desc: Texture.Desc) std.mem.Allocator.Error!Texture {
+	pub fn load_texture(self: *Assets, desc: Texture.Desc) std.mem.Allocator.Error!Texture {
 		var loaded = coral.asyncio.Future(std.mem.Allocator.Error!Texture){};
 
-		rendering.enqueue_work(.{
+		self.pending_work.enqueue(.{
 			.load_texture = .{
 				.desc = desc,
 				.loaded = &loaded,
@@ -132,55 +168,127 @@ pub const Assets = struct {
 	pub const thread_restriction = .main;
 };
 
-pub const Commands = struct {
+pub const Color = @Vector(4, f32);
-	list: *rendering.Commands.List,
 
-	pub const State = struct {
+pub const Commands = struct {
-		commands: *rendering.Commands,
+	pending: *List,
+
+	const Command = union (enum) {
+		draw_texture: DrawTextureCommand,
+		set_effect: SetEffectCommand,
+		set_target: SetTargetCommand,
 	};
 
-	pub fn bind(_: flow.system.BindContext) std.mem.Allocator.Error!State {
+	pub const DrawTextureCommand = struct {
-		var created_commands = coral.asyncio.Future(std.mem.Allocator.Error!*rendering.Commands){};
+		texture: Texture,
+		transform: Transform2D,
+	};
 
-		rendering.enqueue_work(.{
+	pub const SetEffectCommand = struct {
-			.create_commands = .{
+		effect: Effect,
-				.created = &created_commands,
+		properties: []const coral.io.Byte,
+	};
+
+	pub const SetTargetCommand = struct {
+		texture: Texture,
+		clear_color: ?Color,
+		clear_depth: ?f32,
+		clear_stencil: ?u8,
+	};
+
+	pub const List = struct {
+		arena: std.heap.ArenaAllocator,
+		stack: coral.stack.Sequential(Command),
+
+		fn clear(self: *List) void {
+			self.stack.clear();
+
+			if (!self.arena.reset(.retain_capacity)) {
+				std.log.warn("failed to reset the buffer of a gfx queue with retained capacity", .{});
+			}
+		}
+
+		fn deinit(self: *List) void {
+			self.arena.deinit();
+			self.stack.deinit();
+
+			self.* = undefined;
+		}
+
+		fn init(allocator: std.mem.Allocator) List {
+			return .{
+				.arena = std.heap.ArenaAllocator.init(allocator),
+				.stack = .{.allocator = allocator},
+			};
+		}
+	};
+
+	pub const Param = struct {
+		swap_lists: [2]List,
+		swap_state: u1 = 0,
+
+		fn deinit(self: *Param) void {
+			for (&self.swap_lists) |*list| {
+				list.deinit();
+			}
+
+			self.* = undefined;
+		}
+
+		fn pending_list(self: *Param) *List {
+			return &self.swap_lists[self.swap_state];
+		}
+
+		fn rotate(self: *Param) void {
+			const swapped_state = self.swap_state ^ 1;
+
+			self.swap_lists[swapped_state].clear();
+
+			self.swap_state = swapped_state;
+		}
+
+		pub fn submitted_commands(self: Param) []const Command {
+			return self.swap_lists[self.swap_state ^ 1].stack.values;
+		}
+	};
+
+	pub fn bind(_: flow.system.BindContext) std.mem.Allocator.Error!Param {
+		return .{
+			.swap_lists = .{
+				List.init(coral.heap.allocator),
+				List.init(coral.heap.allocator),
 			},
-		});
-
-		return .{
-			.commands = try created_commands.get().*,
 		};
 	}
 
-	pub fn init(state: *State) Commands {
+	pub fn init(state: *Param) Commands {
 		return .{
-			.list = state.commands.pending_list(),
+			.pending = state.pending_list(),
 		};
 	}
 
-	pub fn draw_texture(self: Commands, command: rendering.Command.DrawTexture) std.mem.Allocator.Error!void {
+	pub fn draw_texture(self: Commands, command: DrawTextureCommand) std.mem.Allocator.Error!void {
-		try self.list.append(.{.draw_texture = command});
+		try self.pending.stack.push_grow(.{.draw_texture = command});
 	}
 
-	pub fn set_effect(self: Commands, effect: handles.Effect, properties: anytype) std.mem.Allocator.Error!void {
+	pub fn set_effect(self: Commands, command: SetEffectCommand) std.mem.Allocator.Error!void {
-		try self.list.append(.{
+		try self.pending.stack.push_grow(.{
 			.set_effect = .{
-				.properties = std.mem.asBytes(&properties),
+				.properties = try self.pending.arena.allocator().dupe(coral.io.Byte, command.properties),
-				.effect = effect,
+				.effect = command.effect,
 			},
 		});
 	}
 
-	pub fn set_target(self: Commands, command: rendering.Command.SetTarget) std.mem.Allocator.Error!void {
+	pub fn set_target(self: Commands, command: SetTargetCommand) std.mem.Allocator.Error!void {
-		try self.list.append(.{.set_target = command});
+		try self.pending.stack.push_grow(.{.set_target = command});
 	}
 };
 
 pub const Config = struct {
 	width: u16 = 1280,
 	height: u16 = 720,
-	clear_color: lina.Color = colors.black,
+	clear_color: Color = colors.black,
 };
 
 pub const Input = union (enum) {
@@ -199,9 +307,59 @@ pub const Input = union (enum) {
 	};
 };
 
-pub const Effect = handles.Effect;
+pub const Effect = enum (u32) {
+	default,
+	_,
 
-pub const Texture = handles.Texture;
+	pub const Desc = struct {
+		fragment_spirv_ops: []const u32,
+	};
+};
+
+pub const Texture = enum (u32) {
+	default,
+	backbuffer,
+	_,
+
+	pub const Desc = struct {
+		format: Format,
+		access: Access,
+
+		pub const Access = union (enum) {
+			static: StaticAccess,
+			render: RenderAccess,
+		};
+
+		pub const StaticAccess = struct {
+			width: u16,
+			data: []const coral.io.Byte,
+		};
+
+		pub const RenderAccess = struct {
+			width: u16,
+			height: u16,
+		};
+	};
+
+	pub const Format = enum {
+		rgba8,
+		bgra8,
+
+		pub fn byte_size(self: Format) usize {
+			return switch (self) {
+				.rgba8, .bgra8 => 4,
+			};
+		}
+	};
+};
+
+pub const Transform2D = extern struct {
+	xbasis: Vector = .{1, 0},
+	ybasis: Vector = .{0, 1},
+	origin: Vector = @splat(0),
+
+	const Vector = @Vector(2, f32);
+};
 
 pub fn poll(app: flow.Write(App), inputs: msg.Send(Input)) !void {
 	var event = @as(ext.SDL_Event, undefined);
@@ -228,7 +386,7 @@ pub fn setup(world: *flow.World, events: App.Events) (error {Unsupported} || std
 			assets.deinit();
 		}
 
-		break: create try world.set_get_resource(assets);
+		break: create try world.set_get_state(assets);
 	};
 
 	assets.frame_rendered.set();
@@ -237,6 +395,8 @@ pub fn setup(world: *flow.World, events: App.Events) (error {Unsupported} || std
 		assets.deinit();
 	}
 
+	assets.has_worker_thread = try std.Thread.spawn(.{}, sokol.run, .{&assets.pending_work, assets.window});
+
 	const builtin_texture_formats = [_]Assets.TextureFormat{
 		.{
 			.extension = "bmp",
@@ -248,7 +408,7 @@ pub fn setup(world: *flow.World, events: App.Events) (error {Unsupported} || std
 		try assets.texture_formats.push_grow(format);
 	}
 
-	try world.set_resource(Config{});
+	try world.set_state(Config{});
 	try world.on_event(events.pre_update, flow.system_fn(poll), .{.label = "poll gfx"});
 	try world.on_event(events.exit, flow.system_fn(stop), .{.label = "stop gfx"});
 	try world.on_event(events.finish, flow.system_fn(synchronize), .{.label = "synchronize gfx"});
@@ -258,34 +418,40 @@ pub fn stop(assets: flow.Write(Assets)) void {
 	assets.res.deinit();
 }
 
-pub fn synchronize(assets: flow.Write(Assets), config: flow.Read(Config)) !void {
+pub fn synchronize(exclusive: flow.Exclusive) !void {
-	assets.res.frame_rendered.wait();
+	const assets = exclusive.world.get_state(Assets).?;
-	assets.res.frame_rendered.reset();
+	const config = exclusive.world.get_state(Config).?;
 
-	var commands_swapped = std.Thread.ResetEvent{};
+	assets.frame_rendered.wait();
+	assets.frame_rendered.reset();
 
-	rendering.enqueue_work(.{
+	{
-		.rotate_commands = .{
+		var has_command_param = exclusive.world.get_params(Commands).has_head;
-			.finished = &commands_swapped,
+
-		},
+		while (has_command_param) |command_param| : (has_command_param = command_param.has_next) {
-	});
+			command_param.param.rotate();
+		}
+	}
 
 	var display_width, var display_height = [_]c_int{0, 0};
 
-	ext.SDL_GL_GetDrawableSize(assets.res.window, &display_width, &display_height);
+	ext.SDL_GL_GetDrawableSize(assets.window, &display_width, &display_height);
 
-	if (config.res.width != display_width or config.res.height != display_height) {
+	if (config.width != display_width or config.height != display_height) {
-		ext.SDL_SetWindowSize(assets.res.window, config.res.width, config.res.height);
+		ext.SDL_SetWindowSize(assets.window, config.width, config.height);
 	}
 
-	commands_swapped.wait();
+	if (exclusive.world.get_params(Commands).has_head) |command_param| {
-
+		assets.pending_work.enqueue(.{
-	rendering.enqueue_work(.{
+			.render_frame = .{
-		.render_frame = .{
+				.has_command_params = command_param,
-			.width = config.res.width,
+				.width = config.width,
-			.height = config.res.height,
+				.height = config.height,
-			.clear_color = config.res.clear_color,
+				.clear_color = config.clear_color,
-			.finished = &assets.res.frame_rendered,
+				.finished = &assets.frame_rendered,
-		},
+			},
-	});
+		});
+	} else {
+		assets.frame_rendered.set();
+	}
 }

src/ona/gfx/bmp.zig

@@ -1,10 +1,10 @@
 const coral = @import("coral");
 
-const handles = @import("./handles.zig");
+const gfx = @import("../gfx.zig");
 
 const std = @import("std");
 
-pub fn load_file(arena: *std.heap.ArenaAllocator, storage: coral.files.Storage, path: []const u8) !handles.Texture.Desc {
+pub fn load_file(arena: *std.heap.ArenaAllocator, storage: coral.files.Storage, path: []const u8) !gfx.Texture.Desc {
 	const header = try storage.read_little(path, 0, extern struct {
 		type: [2]u8 align (1),
 		file_size: u32 align (1),

src/ona/gfx/colors.zig

@@ -1,13 +1,13 @@
-const lina = @import("./lina.zig");
+const gfx = @import("../gfx.zig");
 
 pub const black = greyscale(0);
 
 pub const white = greyscale(1);
 
-pub fn greyscale(v: f32) lina.Color {
+pub fn greyscale(v: f32) gfx.Color {
 	return .{v, v, v, 1};
 }
 
-pub fn rgb(r: f32, g: f32, b: f32) lina.Color {
+pub fn rgb(r: f32, g: f32, b: f32) gfx.Color {
 	return .{r, g, b, 1};
 }

src/ona/gfx/handles.zig

@@ -1,56 +0,0 @@
-const coral = @import("coral");
-
-const std = @import("std");
-
-pub const Effect = Handle(struct {
-	fragment_spirv_ops: []const u32,
-});
-
-fn Handle(comptime HandleDesc: type) type {
-	return enum (u32) {
-		default,
-		_,
-
-		pub const Desc = HandleDesc;
-
-		const Self = @This();
-	};
-}
-
-pub const Texture = enum (u32) {
-	default,
-	backbuffer,
-	_,
-
-	pub const Desc = struct {
-		format: Format,
-		access: Access,
-
-		pub const Access = union (enum) {
-			static: Static,
-			render: Render,
-
-			pub const Static = struct {
-				width: u16,
-				data: []const coral.io.Byte,
-			};
-
-			pub const Render = struct {
-				width: u16,
-				height: u16,
-			};
-		};
-
-		pub const Format = enum {
-			rgba8,
-			bgra8,
-
-			pub fn byte_size(self: Format) usize {
-				return switch (self) {
-					.rgba8, .bgra8 => 4,
-				};
-			}
-		};
-	};
-};
-

src/ona/gfx/lina.zig

@@ -1,34 +0,0 @@
-pub const Color = @Vector(4, f32);
-
-pub fn EvenOrderMatrix(comptime n: usize, comptime Element: type) type {
-	return [n]@Vector(n, Element);
-}
-
-pub const Transform2D = extern struct {
-	xbasis: Vector = .{1, 0},
-	ybasis: Vector = .{0, 1},
-	origin: Vector = @splat(0),
-
-	const Vector = @Vector(2, f32);
-};
-
-pub const ProjectionMatrix = EvenOrderMatrix(4, f32);
-
-pub const Rect = struct {
-	left: f32,
-	top: f32,
-	right: f32,
-	bottom: f32,
-};
-
-pub fn orthographic_projection(near: f32, far: f32, viewport: Rect) EvenOrderMatrix(4, f32) {
-	const width = viewport.right - viewport.left;
-	const height = viewport.bottom - viewport.top;
-
-	return .{
-		.{2 / width, 0, 0, 0},
-		.{0, 2 / height, 0, 0},
-		.{0, 0, 1 / (far - near), 0},
-		.{-((viewport.left + viewport.right) / width), -((viewport.top + viewport.bottom) / height), near / (near - far), 1},
-	};
-}

src/ona/gfx/resources.zig

@@ -1,380 +0,0 @@
-const coral = @import("coral");
-
-const handles = @import("./handles.zig");
-
-const lina = @import("./lina.zig");
-
-const sokol = @import("sokol");
-
-const spirv = @import("./spirv.zig");
-
-const std = @import("std");
-
-pub const Effect = struct {
-	shader: sokol.gfx.Shader,
-	pipeline: sokol.gfx.Pipeline,
-	properties: []coral.io.Byte,
-
-	pub fn deinit(self: *Effect) void {
-		coral.heap.allocator.free(self.properties);
-		sokol.gfx.destroyPipeline(self.pipeline);
-		sokol.gfx.destroyShader(self.shader);
-
-		self.* = undefined;
-	}
-
-	pub fn init(desc: handles.Effect.Desc) spirv.Error!Effect {
-		var spirv_arena = std.heap.ArenaAllocator.init(coral.heap.allocator);
-
-		defer {
-			spirv_arena.deinit();
-		}
-
-		const spirv_program = try spirv.analyze(&spirv_arena, .{
-			.target = try switch (sokol.gfx.queryBackend()) {
-				.GLCORE => spirv.Target.glsl,
-				else => error.InvalidSPIRV,
-			},
-
-			.vertex_source = .{
-				.ops = &spirv.to_ops(@embedFile("./shaders/2d_default.vert.spv")),
-			},
-
-			.fragment_source = .{
-				.ops = desc.fragment_spirv_ops,
-			},
-		});
-
-		const shader = sokol.gfx.makeShader(shader_desc: {
-			const shader_desc = sokol.gfx.ShaderDesc{
-				.vs = stage_desc(spirv_program.vertex_stage),
-				.fs = stage_desc(spirv_program.fragment_stage),
-			};
-
-			// TODO: Vertex attributes, for some reason they aren't needed?
-
-			break: shader_desc shader_desc;
-		});
-
-		// TODO: Review blending rules.
-		const pipeline = sokol.gfx.makePipeline(pipeline_desc: {
-			var pipeline_desc = sokol.gfx.PipelineDesc{
-				.label = "Effect pipeline",
-				.layout = vertex_layout_state,
-				.shader = shader,
-				.index_type = .UINT16,
-				.blend_color = .{.r = 1.0, .g = 1.0, .b = 1.0, .a = 1.0},
-			};
-
-			pipeline_desc.colors[0] = .{
-				.write_mask = .RGBA,
-
-				.blend = .{
-					.enabled = true,
-					.src_factor_rgb = .SRC_ALPHA,
-					.dst_factor_rgb = .ONE_MINUS_SRC_ALPHA,
-				},
-			};
-
-			break: pipeline_desc pipeline_desc;
-		});
-
-		const properties = try coral.heap.allocator.alloc(
-			coral.io.Byte,
-			if (spirv_program.fragment_stage.has_uniform_blocks[0]) |uniform_block| uniform_block.size() else 0,
-		);
-
-		errdefer {
-			coral.heap.allocator.free(properties);
-			sokol.gfx.destroyPipeline(pipeline);
-			sokol.gfx.destroyShader(shader);
-		}
-
-		return .{
-			.shader = shader,
-			.pipeline = pipeline,
-			.properties = properties,
-		};
-	}
-
-	fn stage_desc(spirv_stage: spirv.Stage) sokol.gfx.ShaderStageDesc {
-		var stage = sokol.gfx.ShaderStageDesc{
-			.entry = spirv_stage.entry_point,
-			.source = spirv_stage.source,
-		};
-
-		for (0 .. spirv.Stage.max_uniform_blocks) |slot| {
-			const uniform_block = &(spirv_stage.has_uniform_blocks[slot] orelse {
-				continue;
-			});
-
-			const stage_uniform_block = &stage.uniform_blocks[slot];
-
-			stage_uniform_block.layout = switch (uniform_block.layout) {
-				.std140 => .STD140,
-			};
-
-			stage_uniform_block.size = uniform_block.size();
-
-			for (stage_uniform_block.uniforms[0 .. uniform_block.uniforms.len], uniform_block.uniforms) |*stage_uniform, uniform| {
-				stage_uniform.* = .{
-					.type = switch (uniform.type) {
-						.float => .FLOAT,
-						.float2 => .FLOAT2,
-						.float3 => .FLOAT3,
-						.float4 => .FLOAT4,
-						.integer => .INT,
-						.integer2 => .INT2,
-						.integer3 => .INT3,
-						.integer4 => .INT4,
-						.matrix4 => .MAT4,
-					},
-
-					.name = uniform.name,
-					.array_count = uniform.len,
-				};
-			}
-		}
-
-		for (0 .. spirv.Stage.max_images) |slot| {
-			const image = &(spirv_stage.has_images[slot] orelse {
-				continue;
-			});
-
-			stage.images[slot] = .{
-				.multisampled = image.is_multisampled,
-				.image_type = ._2D,
-				.sample_type = .FLOAT,
-				.used = true,
-			};
-		}
-
-		for (0 .. spirv.Stage.max_samplers) |slot| {
-			const sampler = &(spirv_stage.has_samplers[slot] orelse {
-				continue;
-			});
-
-			stage.samplers[slot] = .{
-				.sampler_type = switch (sampler.*) {
-					.filtering => .FILTERING,
-					.non_filtering => .NONFILTERING,
-					.comparison => .COMPARISON,
-				},
-
-				.used = true,
-			};
-		}
-
-		for (0 .. spirv.Stage.max_image_sampler_pairs) |slot| {
-			const image_sampler_pair = &(spirv_stage.has_image_sampler_pairs[slot] orelse {
-				continue;
-			});
-
-			stage.image_sampler_pairs[slot] = .{
-				.glsl_name = image_sampler_pair.name,
-				.image_slot = @intCast(image_sampler_pair.image_slot),
-				.sampler_slot = @intCast(image_sampler_pair.sampler_slot),
-				.used = true,
-			};
-		}
-
-		return stage;
-	}
-
-	const vertex_layout_state = sokol.gfx.VertexLayoutState{
-		.attrs = get: {
-			var attrs = [_]sokol.gfx.VertexAttrState{.{}} ** 16;
-
-			attrs[0] = .{
-				.format = .FLOAT2,
-				.buffer_index = 0,
-			};
-
-			attrs[1] = .{
-				.format = .FLOAT2,
-				.buffer_index = 0,
-			};
-
-			attrs[2] = .{
-				.format = .FLOAT2,
-				.buffer_index = 1,
-			};
-
-			attrs[3] = .{
-				.format = .FLOAT2,
-				.buffer_index = 1,
-			};
-
-			attrs[4] = .{
-				.format = .FLOAT2,
-				.buffer_index = 1,
-			};
-
-			attrs[5] = .{
-				.format = .UBYTE4N,
-				.buffer_index = 1,
-			};
-
-			attrs[6] = .{
-				.format = .FLOAT,
-				.buffer_index = 1,
-			};
-
-			attrs[7] = .{
-				.format = .FLOAT4,
-				.buffer_index = 1,
-			};
-
-			break: get attrs;
-		},
-
-		.buffers = get: {
-			var vertex_buffer_layouts = [_]sokol.gfx.VertexBufferLayoutState{.{}} ** 8;
-
-			vertex_buffer_layouts[1].step_func = .PER_INSTANCE;
-
-			break: get vertex_buffer_layouts;
-		},
-	};
-};
-
-pub const Texture = struct {
-	width: u16,
-	height: u16,
-	access: Access,
-
-	pub const Access = union (enum) {
-		empty,
-		render: RenderAccess,
-		static: StaticAccess,
-	};
-
-	pub const RenderAccess = struct {
-		color_image: sokol.gfx.Image,
-		depth_image: sokol.gfx.Image,
-		attachments: sokol.gfx.Attachments,
-	};
-
-	pub const StaticAccess = struct {
-		image: sokol.gfx.Image,
-	};
-
-	pub fn deinit(self: *Texture) void {
-		switch (self.access) {
-			.render => |render| {
-				sokol.gfx.destroyImage(render.color_image);
-				sokol.gfx.destroyImage(render.depth_image);
-				sokol.gfx.destroyAttachments(render.attachments);
-			},
-
-			.static => |static| {
-				sokol.gfx.destroyImage(static.image);
-			},
-
-			.empty => {},
-		}
-
-		self.* = undefined;
-	}
-
-	pub fn init(desc: handles.Texture.Desc) std.mem.Allocator.Error!Texture {
-		const pixel_format = switch (desc.format) {
-			.rgba8 => sokol.gfx.PixelFormat.RGBA8,
-			.bgra8 => sokol.gfx.PixelFormat.BGRA8,
-		};
-
-		switch (desc.access) {
-			.render => |render| {
-				if (render.width == 0 or render.height == 0) {
-					return .{
-						.width = render.width,
-						.height = render.height,
-						.access = .empty,
-					};
-				}
-
-				const color_image = sokol.gfx.makeImage(.{
-					.pixel_format = pixel_format,
-					.width = render.width,
-					.height = render.height,
-					.render_target = true,
-				});
-
-				const depth_image = sokol.gfx.makeImage(.{
-					.width = render.width,
-					.height = render.height,
-					.render_target = true,
-					.pixel_format = .DEPTH_STENCIL,
-				});
-
-				const attachments = sokol.gfx.makeAttachments(attachments_desc: {
-					var attachments_desc = sokol.gfx.AttachmentsDesc{
-						.depth_stencil = .{
-							.image = depth_image,
-						},
-					};
-
-					attachments_desc.colors[0] = .{
-						.image = color_image,
-					};
-
-					break: attachments_desc attachments_desc;
-				});
-
-				return .{
-					.width = render.width,
-					.height = render.height,
-
-					.access = .{
-						.render = .{
-							.attachments = attachments,
-							.color_image = color_image,
-							.depth_image = depth_image,
-						},
-					},
-				};
-			},
-
-			.static => |static| {
-				const height = std.math.cast(u16, static.data.len / (static.width * desc.format.byte_size())) orelse {
-					return error.OutOfMemory;
-				};
-
-				if (static.width == 0 or height == 0) {
-					return .{
-						.width = static.width,
-						.height = height,
-						.access = .empty,
-					};
-				}
-
-				const image = sokol.gfx.makeImage(image_desc: {
-					var image_desc = sokol.gfx.ImageDesc{
-						.height = height,
-						.pixel_format = pixel_format,
-						.width = static.width,
-					};
-
-					image_desc.data.subimage[0][0] = sokol.gfx.asRange(static.data);
-
-					break: image_desc image_desc;
-				});
-
-				errdefer {
-					sokol.gfx.destroyImage(image);
-				}
-
-				return .{
-					.width = static.width,
-					.height = height,
-
-					.access = .{
-						.static = .{
-							.image = image,
-						},
-					},
-				};
-			},
-		}
-	}
-};

src/ona/gfx/sokol.zig

@@ -2,11 +2,7 @@ const coral = @import("coral");
 
 const ext = @import("../ext.zig");
 
-const handles = @import("./handles.zig");
+const gfx = @import("../gfx.zig");
-
-const lina = @import("./lina.zig");
-
-const resources = @import("./resources.zig");
 
 const spirv = @import("./spirv.zig");
 
@@ -14,139 +10,23 @@ const sokol = @import("sokol");
 
 const std = @import("std");
 
-pub const Command = union (enum) {
-	draw_texture: DrawTexture,
-	set_effect: SetEffect,
-	set_target: SetTarget,
-
-	pub const DrawTexture = struct {
-		texture: handles.Texture,
-		transform: lina.Transform2D,
-	};
-
-	pub const SetEffect = struct {
-		effect: handles.Effect,
-		properties: []const coral.io.Byte,
-	};
-
-	pub const SetTarget = struct {
-		texture: handles.Texture,
-		clear_color: ?lina.Color,
-		clear_depth: ?f32,
-		clear_stencil: ?u8,
-	};
-
-	fn clone(self: Command, arena: *std.heap.ArenaAllocator) !Command {
-		return switch (self) {
-			.draw_texture => |draw_texture| .{.draw_texture = draw_texture},
-
-			.set_effect => |set_effect| .{
-				.set_effect = .{
-					.properties = try arena.allocator().dupe(coral.io.Byte, set_effect.properties),
-					.effect = set_effect.effect,
-				},
-			},
-
-			.set_target => |set_target| .{.set_target = set_target},
-		};
-	}
-
-	fn process(self: Command, pools: *Pools, frame: *Frame) !void {
-		try switch (self) {
-			.draw_texture => |draw_texture| frame.draw_texture(pools, draw_texture),
-			.set_effect => |set_effect| frame.set_effect(pools, set_effect),
-			.set_target => |set_target| frame.set_target(pools, set_target),
-		};
-	}
-};
-
-pub const Commands = struct {
-	swap_lists: [2]List,
-	swap_state: u1 = 0,
-	has_next: ?*Commands = null,
-	has_prev: ?*Commands = null,
-
-	pub const List = struct {
-		arena: std.heap.ArenaAllocator,
-		stack: coral.stack.Sequential(Command),
-
-		pub fn append(self: *List, command: Command) std.mem.Allocator.Error!void {
-			return self.stack.push_grow(try command.clone(&self.arena));
-		}
-
-		pub fn clear(self: *List) void {
-			self.stack.clear();
-
-			if (!self.arena.reset(.retain_capacity)) {
-				std.log.warn("failed to reset the buffer of a gfx queue with retained capacity", .{});
-			}
-		}
-
-		fn deinit(self: *List) void {
-			self.arena.deinit();
-			self.stack.deinit();
-
-			self.* = undefined;
-		}
-
-		fn init(allocator: std.mem.Allocator) List {
-			return .{
-				.arena = std.heap.ArenaAllocator.init(allocator),
-				.stack = .{.allocator = allocator},
-			};
-		}
-	};
-
-	const Self = @This();
-
-	pub fn deinit(self: *Self) void {
-		for (&self.swap_lists) |*list| {
-			list.deinit();
-		}
-
-		self.* = undefined;
-	}
-
-	pub fn init(allocator: std.mem.Allocator) Self {
-		return .{
-			.swap_lists = .{List.init(allocator), List.init(allocator)},
-		};
-	}
-
-	pub fn pending_list(self: *Self) *List {
-		return &self.swap_lists[self.swap_state];
-	}
-
-	fn rotate(self: *Self) void {
-		const swapped_state = self.swap_state ^ 1;
-
-		self.swap_lists[swapped_state].clear();
-
-		self.swap_state = swapped_state;
-	}
-
-	pub fn submitted_commands(self: *const Self) []const Command {
-		return self.swap_lists[self.swap_state ^ 1].stack.values;
-	}
-};
-
 const Frame = struct {
 	swapchain: sokol.gfx.Swapchain,
 	drawn_count: usize = 0,
 	flushed_count: usize = 0,
-	current_source_texture: handles.Texture = .default,
+	current_source_texture: gfx.Texture = .default,
-	current_target_texture: handles.Texture = .backbuffer,
+	current_target_texture: gfx.Texture = .backbuffer,
-	current_effect: handles.Effect = .default,
+	current_effect: gfx.Effect = .default,
 
 	const DrawTexture = extern struct {
-		transform: lina.Transform2D,
+		transform: gfx.Transform2D,
 		tint: @Vector(4, u8) = @splat(std.math.maxInt(u8)),
 		depth: f32 = 0,
 		texture_offset: @Vector(2, f32) = @splat(0),
 		texture_size: @Vector(2, f32) = @splat(1),
 	};
 
-	pub fn draw_texture(self: *Frame, pools: *Pools, command: Command.DrawTexture) !void {
+	pub fn draw_texture(self: *Frame, pools: *Resources, command: gfx.Commands.DrawTextureCommand) !void {
 		if (command.texture != self.current_source_texture) {
 			self.flush(pools);
 		}
@@ -174,7 +54,7 @@ const Frame = struct {
 		self.drawn_count += 1;
 	}
 
-	pub fn flush(self: *Frame, pools: *Pools) void {
+	pub fn flush(self: *Frame, pools: *Resources) void {
 		if (self.flushed_count == self.drawn_count) {
 			return;
 		}
@@ -207,7 +87,7 @@ const Frame = struct {
 
 		const texture = pools.get_texture(self.current_target_texture).?;
 
-		sokol.gfx.applyUniforms(.VS, 0, sokol.gfx.asRange(&lina.orthographic_projection(-1.0, 1.0, .{
+		sokol.gfx.applyUniforms(.VS, 0, sokol.gfx.asRange(&coral.lina.orthographic_projection(-1.0, 1.0, .{
 			.left = 0,
 			.top = 0,
 			.right = @floatFromInt(texture.width),
@@ -236,7 +116,7 @@ const Frame = struct {
 		}
 	}
 
-	pub fn set_effect(self: *Frame, pools: *Pools, command: Command.SetEffect) void {
+	pub fn set_effect(self: *Frame, pools: *Resources, command: gfx.Commands.SetEffectCommand) void {
 		if (command.effect != self.current_effect) {
 			self.flush(pools);
 		}
@@ -248,7 +128,7 @@ const Frame = struct {
 		}
 	}
 
-	pub fn set_target(self: *Frame, pools: *Pools, command: Command.SetTarget) void {
+	pub fn set_target(self: *Frame, pools: *Resources, command: gfx.Commands.SetTargetCommand) void {
 		sokol.gfx.endPass();
 
 		var pass = sokol.gfx.Pass{
@@ -298,31 +178,401 @@ const Frame = struct {
 	const batches_per_buffer = 512;
 };
 
-const Pools = struct {
+const Resources = struct {
 	effects: EffectPool,
 	textures: TexturePool,
 
-	const EffectPool = coral.Pool(resources.Effect);
+	pub const Effect = struct {
+		shader: sokol.gfx.Shader,
+		pipeline: sokol.gfx.Pipeline,
+		properties: []coral.io.Byte,
 
-	const TexturePool = coral.Pool(resources.Texture);
+		pub fn deinit(self: *Effect) void {
+			coral.heap.allocator.free(self.properties);
+			sokol.gfx.destroyPipeline(self.pipeline);
+			sokol.gfx.destroyShader(self.shader);
 
-	pub fn create_effect(self: *Pools, desc: handles.Effect.Desc) !handles.Effect {
+			self.* = undefined;
-		var effect = try resources.Effect.init(desc);
+		}
+
+		pub fn init(desc: gfx.Effect.Desc) spirv.Error!Effect {
+			var spirv_arena = std.heap.ArenaAllocator.init(coral.heap.allocator);
+
+			defer {
+				spirv_arena.deinit();
+			}
+
+			const spirv_program = try spirv.analyze(&spirv_arena, .{
+				.target = try switch (sokol.gfx.queryBackend()) {
+					.GLCORE => spirv.Target.glsl,
+					else => error.InvalidSPIRV,
+				},
+
+				.vertex_source = .{
+					.ops = &spirv.to_ops(@embedFile("./shaders/2d_default.vert.spv")),
+				},
+
+				.fragment_source = .{
+					.ops = desc.fragment_spirv_ops,
+				},
+			});
+
+			const shader = sokol.gfx.makeShader(shader_desc: {
+				const shader_desc = sokol.gfx.ShaderDesc{
+					.vs = stage_desc(spirv_program.vertex_stage),
+					.fs = stage_desc(spirv_program.fragment_stage),
+				};
+
+				// TODO: Vertex attributes, for some reason they aren't needed?
+
+				break: shader_desc shader_desc;
+			});
+
+			// TODO: Review blending rules.
+			const pipeline = sokol.gfx.makePipeline(pipeline_desc: {
+				var pipeline_desc = sokol.gfx.PipelineDesc{
+					.label = "Effect pipeline",
+					.layout = vertex_layout_state,
+					.shader = shader,
+					.index_type = .UINT16,
+					.blend_color = .{.r = 1.0, .g = 1.0, .b = 1.0, .a = 1.0},
+				};
+
+				pipeline_desc.colors[0] = .{
+					.write_mask = .RGBA,
+
+					.blend = .{
+						.enabled = true,
+						.src_factor_rgb = .SRC_ALPHA,
+						.dst_factor_rgb = .ONE_MINUS_SRC_ALPHA,
+					},
+				};
+
+				break: pipeline_desc pipeline_desc;
+			});
+
+			const properties = try coral.heap.allocator.alloc(
+				coral.io.Byte,
+				if (spirv_program.fragment_stage.has_uniform_blocks[0]) |uniform_block| uniform_block.size() else 0,
+			);
+
+			errdefer {
+				coral.heap.allocator.free(properties);
+				sokol.gfx.destroyPipeline(pipeline);
+				sokol.gfx.destroyShader(shader);
+			}
+
+			return .{
+				.shader = shader,
+				.pipeline = pipeline,
+				.properties = properties,
+			};
+		}
+
+		fn stage_desc(spirv_stage: spirv.Stage) sokol.gfx.ShaderStageDesc {
+			var stage = sokol.gfx.ShaderStageDesc{
+				.entry = spirv_stage.entry_point,
+				.source = spirv_stage.source,
+			};
+
+			for (0 .. spirv.Stage.max_uniform_blocks) |slot| {
+				const uniform_block = &(spirv_stage.has_uniform_blocks[slot] orelse {
+					continue;
+				});
+
+				const stage_uniform_block = &stage.uniform_blocks[slot];
+
+				stage_uniform_block.layout = switch (uniform_block.layout) {
+					.std140 => .STD140,
+				};
+
+				stage_uniform_block.size = uniform_block.size();
+
+				for (stage_uniform_block.uniforms[0 .. uniform_block.uniforms.len], uniform_block.uniforms) |*stage_uniform, uniform| {
+					stage_uniform.* = .{
+						.type = switch (uniform.type) {
+							.float => .FLOAT,
+							.float2 => .FLOAT2,
+							.float3 => .FLOAT3,
+							.float4 => .FLOAT4,
+							.integer => .INT,
+							.integer2 => .INT2,
+							.integer3 => .INT3,
+							.integer4 => .INT4,
+							.matrix4 => .MAT4,
+						},
+
+						.name = uniform.name,
+						.array_count = uniform.len,
+					};
+				}
+			}
+
+			for (0 .. spirv.Stage.max_images) |slot| {
+				const image = &(spirv_stage.has_images[slot] orelse {
+					continue;
+				});
+
+				stage.images[slot] = .{
+					.multisampled = image.is_multisampled,
+					.image_type = ._2D,
+					.sample_type = .FLOAT,
+					.used = true,
+				};
+			}
+
+			for (0 .. spirv.Stage.max_samplers) |slot| {
+				const sampler = &(spirv_stage.has_samplers[slot] orelse {
+					continue;
+				});
+
+				stage.samplers[slot] = .{
+					.sampler_type = switch (sampler.*) {
+						.filtering => .FILTERING,
+						.non_filtering => .NONFILTERING,
+						.comparison => .COMPARISON,
+					},
+
+					.used = true,
+				};
+			}
+
+			for (0 .. spirv.Stage.max_image_sampler_pairs) |slot| {
+				const image_sampler_pair = &(spirv_stage.has_image_sampler_pairs[slot] orelse {
+					continue;
+				});
+
+				stage.image_sampler_pairs[slot] = .{
+					.glsl_name = image_sampler_pair.name,
+					.image_slot = @intCast(image_sampler_pair.image_slot),
+					.sampler_slot = @intCast(image_sampler_pair.sampler_slot),
+					.used = true,
+				};
+			}
+
+			return stage;
+		}
+
+		const vertex_layout_state = sokol.gfx.VertexLayoutState{
+			.attrs = get: {
+				var attrs = [_]sokol.gfx.VertexAttrState{.{}} ** 16;
+
+				attrs[0] = .{
+					.format = .FLOAT2,
+					.buffer_index = 0,
+				};
+
+				attrs[1] = .{
+					.format = .FLOAT2,
+					.buffer_index = 0,
+				};
+
+				attrs[2] = .{
+					.format = .FLOAT2,
+					.buffer_index = 1,
+				};
+
+				attrs[3] = .{
+					.format = .FLOAT2,
+					.buffer_index = 1,
+				};
+
+				attrs[4] = .{
+					.format = .FLOAT2,
+					.buffer_index = 1,
+				};
+
+				attrs[5] = .{
+					.format = .UBYTE4N,
+					.buffer_index = 1,
+				};
+
+				attrs[6] = .{
+					.format = .FLOAT,
+					.buffer_index = 1,
+				};
+
+				attrs[7] = .{
+					.format = .FLOAT4,
+					.buffer_index = 1,
+				};
+
+				break: get attrs;
+			},
+
+			.buffers = get: {
+				var vertex_buffer_layouts = [_]sokol.gfx.VertexBufferLayoutState{.{}} ** 8;
+
+				vertex_buffer_layouts[1].step_func = .PER_INSTANCE;
+
+				break: get vertex_buffer_layouts;
+			},
+		};
+	};
+
+	pub const Texture = struct {
+		width: u16,
+		height: u16,
+		access: Access,
+
+		pub const Access = union (enum) {
+			empty,
+			render: RenderAccess,
+			static: StaticAccess,
+		};
+
+		pub const RenderAccess = struct {
+			color_image: sokol.gfx.Image,
+			depth_image: sokol.gfx.Image,
+			attachments: sokol.gfx.Attachments,
+		};
+
+		pub const StaticAccess = struct {
+			image: sokol.gfx.Image,
+		};
+
+		pub fn deinit(self: *Texture) void {
+			switch (self.access) {
+				.render => |render| {
+					sokol.gfx.destroyImage(render.color_image);
+					sokol.gfx.destroyImage(render.depth_image);
+					sokol.gfx.destroyAttachments(render.attachments);
+				},
+
+				.static => |static| {
+					sokol.gfx.destroyImage(static.image);
+				},
+
+				.empty => {},
+			}
+
+			self.* = undefined;
+		}
+
+		pub fn init(desc: gfx.Texture.Desc) std.mem.Allocator.Error!Texture {
+			const pixel_format = switch (desc.format) {
+				.rgba8 => sokol.gfx.PixelFormat.RGBA8,
+				.bgra8 => sokol.gfx.PixelFormat.BGRA8,
+			};
+
+			switch (desc.access) {
+				.render => |render| {
+					if (render.width == 0 or render.height == 0) {
+						return .{
+							.width = render.width,
+							.height = render.height,
+							.access = .empty,
+						};
+					}
+
+					const color_image = sokol.gfx.makeImage(.{
+						.pixel_format = pixel_format,
+						.width = render.width,
+						.height = render.height,
+						.render_target = true,
+					});
+
+					const depth_image = sokol.gfx.makeImage(.{
+						.width = render.width,
+						.height = render.height,
+						.render_target = true,
+						.pixel_format = .DEPTH_STENCIL,
+					});
+
+					const attachments = sokol.gfx.makeAttachments(attachments_desc: {
+						var attachments_desc = sokol.gfx.AttachmentsDesc{
+							.depth_stencil = .{
+								.image = depth_image,
+							},
+						};
+
+						attachments_desc.colors[0] = .{
+							.image = color_image,
+						};
+
+						break: attachments_desc attachments_desc;
+					});
+
+					return .{
+						.width = render.width,
+						.height = render.height,
+
+						.access = .{
+							.render = .{
+								.attachments = attachments,
+								.color_image = color_image,
+								.depth_image = depth_image,
+							},
+						},
+					};
+				},
+
+				.static => |static| {
+					const height = std.math.cast(u16, static.data.len / (static.width * desc.format.byte_size())) orelse {
+						return error.OutOfMemory;
+					};
+
+					if (static.width == 0 or height == 0) {
+						return .{
+							.width = static.width,
+							.height = height,
+							.access = .empty,
+						};
+					}
+
+					const image = sokol.gfx.makeImage(image_desc: {
+						var image_desc = sokol.gfx.ImageDesc{
+							.height = height,
+							.pixel_format = pixel_format,
+							.width = static.width,
+						};
+
+						image_desc.data.subimage[0][0] = sokol.gfx.asRange(static.data);
+
+						break: image_desc image_desc;
+					});
+
+					errdefer {
+						sokol.gfx.destroyImage(image);
+					}
+
+					return .{
+						.width = static.width,
+						.height = height,
+
+						.access = .{
+							.static = .{
+								.image = image,
+							},
+						},
+					};
+				},
+			}
+		}
+	};
+
+
+	const EffectPool = coral.Pool(Effect);
+
+	const TexturePool = coral.Pool(Texture);
+
+	pub fn create_effect(self: *Resources, desc: gfx.Effect.Desc) !gfx.Effect {
+		var effect = try Effect.init(desc);
 
 		errdefer effect.deinit();
 
 		return @enumFromInt(try self.effects.insert(effect));
 	}
 
-	pub fn create_texture(self: *Pools, desc: handles.Texture.Desc) !handles.Texture {
+	pub fn create_texture(self: *Resources, desc: gfx.Texture.Desc) !gfx.Texture {
-		var texture = try resources.Texture.init(desc);
+		var texture = try Texture.init(desc);
 
 		errdefer texture.deinit();
 
 		return @enumFromInt(try self.textures.insert(texture));
 	}
 
-	pub fn deinit(self: *Pools) void {
+	pub fn deinit(self: *Resources) void {
 		var textures = self.textures.values();
 
 		while (textures.next()) |texture| {
@@ -332,7 +582,7 @@ const Pools = struct {
 		self.textures.deinit();
 	}
 
-	pub fn destroy_effect(self: *Pools, handle: handles.Effect) bool {
+	pub fn destroy_effect(self: *Resources, handle: gfx.Effect) bool {
 		switch (handle) {
 			.default => {},
 
@@ -348,7 +598,7 @@ const Pools = struct {
 		return true;
 	}
 
-	pub fn destroy_texture(self: *Pools, handle: handles.Texture) bool {
+	pub fn destroy_texture(self: *Resources, handle: gfx.Texture) bool {
 		switch (handle) {
 			.default => {},
 
@@ -364,16 +614,16 @@ const Pools = struct {
 		return true;
 	}
 
-	pub fn get_effect(self: *Pools, handle: handles.Effect) ?*resources.Effect {
+	pub fn get_effect(self: *Resources, handle: gfx.Effect) ?*Effect {
 		return self.effects.get(@intFromEnum(handle));
 	}
 
-	pub fn get_texture(self: *Pools, handle: handles.Texture) ?*resources.Texture {
+	pub fn get_texture(self: *Resources, handle: gfx.Texture) ?*Texture {
 		return self.textures.get(@intFromEnum(handle));
 	}
 
-	pub fn init(allocator: std.mem.Allocator) !Pools {
+	pub fn init(allocator: std.mem.Allocator) !Resources {
-		var pools = Pools{
+		var pools = Resources{
 			.effects = EffectPool.init(allocator),
 			.textures = TexturePool.init(allocator),
 		};
@@ -388,11 +638,11 @@ const Pools = struct {
 			}
 		};
 
-		assert.is_handle(handles.Effect.default, try pools.create_effect(.{
+		assert.is_handle(gfx.Effect.default, try pools.create_effect(.{
 			.fragment_spirv_ops = &spirv.to_ops(@embedFile("./shaders/2d_default.frag.spv")),
 		}));
 
-		assert.is_handle(handles.Texture.default, try pools.create_texture(.{
+		assert.is_handle(gfx.Texture.default, try pools.create_texture(.{
 			.format = .rgba8,
 
 			.access = .{
@@ -413,7 +663,7 @@ const Pools = struct {
 			},
 		}));
 
-		assert.is_handle(handles.Texture.backbuffer, try pools.create_texture(.{
+		assert.is_handle(gfx.Texture.backbuffer, try pools.create_texture(.{
 			.format = .rgba8,
 
 			.access = .{
@@ -428,62 +678,8 @@ const Pools = struct {
 	}
 };
 
-pub const Work = union (enum) {
-	create_commands: CreateCommandsWork,
-	load_effect: LoadEffectWork,
-	load_texture: LoadTextureWork,
-	render_frame: RenderFrameWork,
-	rotate_commands: RotateCommandsWork,
-	shutdown,
-	unload_effect: UnloadEffectWork,
-	unload_texture: UnloadTextureWork,
-
-	pub const CreateCommandsWork = struct {
-		created: *coral.asyncio.Future(std.mem.Allocator.Error!*Commands),
-	};
-
-	pub const LoadEffectWork = struct {
-		desc: handles.Effect.Desc,
-		loaded: *coral.asyncio.Future(std.mem.Allocator.Error!handles.Effect),
-	};
-
-	pub const LoadTextureWork = struct {
-		desc: handles.Texture.Desc,
-		loaded: *coral.asyncio.Future(std.mem.Allocator.Error!handles.Texture),
-	};
-
-	pub const RotateCommandsWork = struct {
-		finished: *std.Thread.ResetEvent,
-	};
-
-	pub const RenderFrameWork = struct {
-		clear_color: lina.Color,
-		width: u16,
-		height: u16,
-		finished: *std.Thread.ResetEvent,
-	};
-
-	pub const UnloadEffectWork = struct {
-		handle: handles.Effect,
-	};
-
-	pub const UnloadTextureWork = struct {
-		handle: handles.Texture,
-	};
-
-	var pending: coral.asyncio.BlockingQueue(1024, Work) = .{};
-};
-
 var default_sampler: sokol.gfx.Sampler = undefined;
 
-pub fn enqueue_work(work: Work) void {
-	Work.pending.enqueue(work);
-}
-
-pub fn startup(window: *ext.SDL_Window) !void {
-	work_thread = try std.Thread.spawn(.{}, run, .{window});
-}
-
 var quad_index_buffer: sokol.gfx.Buffer = undefined;
 
 var quad_vertex_buffer: sokol.gfx.Buffer = undefined;
@@ -493,7 +689,7 @@ const vertex_indices = .{
 	.instance = 1,
 };
 
-fn run(window: *ext.SDL_Window) !void {
+pub fn run(pending_work: *gfx.Assets.WorkQueue, window: *ext.SDL_Window) !void {
 	const context = configure_and_create: {
 		var result = @as(c_int, 0);
 
@@ -530,7 +726,7 @@ fn run(window: *ext.SDL_Window) !void {
 		sokol.gfx.shutdown();
 	}
 
-	var pools = try Pools.init(coral.heap.allocator);
+	var pools = try Resources.init(coral.heap.allocator);
 
 	defer {
 		pools.deinit();
@@ -562,36 +758,8 @@ fn run(window: *ext.SDL_Window) !void {
 
 	default_sampler = sokol.gfx.makeSampler(.{});
 
-	var has_commands_head: ?*Commands = null;
-	var has_commands_tail: ?*Commands = null;
-
 	while (true) {
-		switch (Work.pending.dequeue()) {
+		switch (pending_work.dequeue()) {
-			.create_commands => |create_commands| {
-				const commands = coral.heap.allocator.create(Commands) catch {
-					_ = create_commands.created.resolve(error.OutOfMemory);
-
-					continue;
-				};
-
-				commands.* = Commands.init(coral.heap.allocator);
-
-				if (create_commands.created.resolve(commands)) {
-					if (has_commands_tail) |tail_commands| {
-						tail_commands.has_next = commands;
-						commands.has_prev = tail_commands;
-					} else {
-						std.debug.assert(has_commands_head == null);
-
-						has_commands_head = commands;
-					}
-
-					has_commands_tail = commands;
-				} else {
-					coral.heap.allocator.destroy(commands);
-				}
-			},
-
 			.load_effect => |load| {
 				const effect = try pools.create_effect(load.desc);
 
@@ -614,7 +782,7 @@ fn run(window: *ext.SDL_Window) !void {
 				if (backbuffer.width != render_frame.width or backbuffer.height != render_frame.height) {
 					backbuffer.deinit();
 
-					backbuffer.* = try resources.Texture.init(.{
+					backbuffer.* = try Resources.Texture.init(.{
 						.format = .rgba8,
 
 						.access = .{
@@ -661,11 +829,15 @@ fn run(window: *ext.SDL_Window) !void {
 					break: pass pass;
 				});
 
-				var has_commands = has_commands_head;
+				var has_command_params = render_frame.has_command_params;
 
-				while (has_commands) |commands| : (has_commands = commands.has_next) {
+				while (has_command_params) |command_params| : (has_command_params = command_params.has_next) {
-					for (commands.submitted_commands()) |command| {
+					for (command_params.param.submitted_commands()) |command| {
-						try command.process(&pools, &frame);
+						try switch (command) {
+							.draw_texture => |draw_texture| frame.draw_texture(&pools, draw_texture),
+							.set_effect => |set_effect| frame.set_effect(&pools, set_effect),
+							.set_target => |set_target| frame.set_target(&pools, set_target),
+						};
 					}
 
 					frame.flush(&pools);
@@ -714,16 +886,6 @@ fn run(window: *ext.SDL_Window) !void {
 				render_frame.finished.set();
 			},
 
-			.rotate_commands => |rotate_commands| {
-				var has_commands = has_commands_head;
-
-				while (has_commands) |commands| : (has_commands = commands.has_next) {
-					commands.rotate();
-				}
-
-				rotate_commands.finished.set();
-			},
-
 			.shutdown => {
 				break;
 			},

src/ona/gfx/textures.zig

@@ -0,0 +1,38 @@
+const coral = @import("coral");
+
+pub const Format = enum {
+	rgba8,
+	bgra8,
+
+	pub fn byte_size(self: Format) usize {
+		return switch (self) {
+			.rgba8, .bgra8 => 4,
+		};
+	}
+};
+
+pub const Desc = struct {
+	format: Format,
+	access: Access,
+
+	pub const Access = union (enum) {
+		static: StaticAccess,
+		render: RenderAccess,
+	};
+
+	pub const StaticAccess = struct {
+		width: u16,
+		data: []const coral.io.Byte,
+	};
+
+	pub const RenderAccess = struct {
+		width: u16,
+		height: u16,
+	};
+};
+
+pub const Handle = enum (u32) {
+	default,
+	backbuffer,
+	_,
+};

src/ona/msg.zig

@@ -63,23 +63,23 @@ pub fn Receive(comptime Message: type) type {
 
 		const Self = @This();
 
-		pub const State = struct {
+		pub const Param = struct {
 			channel: *const TypedChannel,
 		};
 
-		pub fn bind(context: flow.system.BindContext) std.mem.Allocator.Error!State {
+		pub fn bind(context: flow.system.BindContext) std.mem.Allocator.Error!Param {
 			return .{
-				.channel = (try context.register_readable_resource_access(TypedChannel)) orelse set: {
+				.channel = (try context.register_readable_state_access(TypedChannel)) orelse set: {
-					try context.world.set_resource(TypedChannel.init(coral.heap.allocator));
+					try context.world.set_state(TypedChannel.init(coral.heap.allocator));
 
-					break: set (try context.register_readable_resource_access(TypedChannel)).?;
+					break: set (try context.register_readable_state_access(TypedChannel)).?;
 				},
 			};
 		}
 
-		pub fn init(state: *State) Self {
+		pub fn init(param: *Param) Self {
 			return .{
-				.channel = state.channel,
+				.channel = param.channel,
 			};
 		}
 
@@ -97,16 +97,16 @@ pub fn Send(comptime Message: type) type {
 
 		const Self = @This();
 
-		pub const State = struct {
+		pub const Param = struct {
 			channel: *TypedChannel,
 		};
 
-		pub fn bind(context: flow.system.BindContext) std.mem.Allocator.Error!State {
+		pub fn bind(context: flow.system.BindContext) std.mem.Allocator.Error!Param {
 			return .{
-				.channel = (try context.register_writable_resource_access(TypedChannel)) orelse set: {
+				.channel = (try context.register_writable_state_access(TypedChannel)) orelse set: {
-					try context.world.set_resource(TypedChannel.init(coral.heap.allocator));
+					try context.world.set_state(TypedChannel.init(coral.heap.allocator));
 
-					const app = context.world.get_resource(App).?;
+					const app = context.world.get_state(App).?;
 
 					try context.world.on_event(app.events.post_update, flow.system_fn(TypedChannel.swap), .{
 						.label = "swap channel of " ++ @typeName(Message),
@@ -116,14 +116,14 @@ pub fn Send(comptime Message: type) type {
 						.label = "clean up channel of " ++ @typeName(Message),
 					});
 
-					break: set (try context.register_writable_resource_access(TypedChannel)).?;
+					break: set (try context.register_writable_state_access(TypedChannel)).?;
 				},
 			};
 		}
 
-		pub fn init(state: *State) Self {
+		pub fn init(param: *Param) Self {
 			return .{
-				.channel = state.channel,
+				.channel = param.channel,
 			};
 		}
 

src/ona/ona.zig

@@ -72,7 +72,7 @@ pub fn start_app(setup: Setup, options: Options) anyerror!void {
 		.exit = try world.create_event("exit"),
 	};
 
-	const app = try world.set_get_resource(App{
+	const app = try world.set_get_state(App{
 		.events = &events,
 		.target_frame_time = 1.0 / @as(f64, @floatFromInt(options.tick_rate)),
 		.elapsed_time = 0,