Add render textures

src/main.zig

@@ -6,8 +6,9 @@ const ona = @import("ona");
 
 const Actors = struct {
 	instances: coral.stack.Sequential(ona.gfx.Point2D) = .{.allocator = coral.heap.allocator},
-	quad_mesh_2d: ona.gfx.Handle = .none,
-	body_texture: ona.gfx.Handle = .none,
+	quad_mesh_2d: ?*ona.gfx.Handle = null,
+	body_texture: ?*ona.gfx.Handle = null,
+	render_texture: ?*ona.gfx.Handle = null,
 };
 
 const Player = struct {
@@ -24,8 +25,21 @@ pub fn main() !void {
 
 fn load(display: coral.Write(ona.gfx.Display), actors: coral.Write(Actors), assets: coral.Write(ona.gfx.Assets)) !void {
 	display.res.width, display.res.height = .{1280, 720};
-	actors.res.body_texture = try assets.res.open_file(coral.files.bundle, "actor.bmp");
-	actors.res.quad_mesh_2d = try assets.res.open_quad_mesh_2d(@splat(1));
+	actors.res.body_texture = try assets.res.create_from_file(coral.files.bundle, "actor.bmp");
+	actors.res.quad_mesh_2d = try assets.res.create_quad_mesh_2d(@splat(1));
+
+	actors.res.render_texture = try assets.res.context.create(.{
+		.texture = .{
+			.format = .rgba8,
+
+			.access = .{
+				.render = .{
+					.width = display.res.width,
+					.height = display.res.height,
+				},
+			},
+		},
+	});
 
 	try actors.res.instances.push_grow(.{0, 0});
 }
@@ -34,27 +48,47 @@ fn exit(actors: coral.Write(Actors)) void {
 	actors.res.instances.deinit();
 }
 
-fn render(queue: ona.gfx.Queue, actors: coral.Write(Actors)) !void {
-	for (actors.res.instances.values) |instance| {
-		try queue.commands.append(.{
-			.instance_2d = .{
-				.mesh_2d = actors.res.quad_mesh_2d,
-				.texture = actors.res.body_texture,
+fn render(queue: ona.gfx.Queue, actors: coral.Write(Actors), display: coral.Read(ona.gfx.Display)) !void {
+	try queue.commands.append(.{.target = .{
+		.texture = actors.res.render_texture.?,
+		.clear_color = .{0, 0, 0, 0},
+		.clear_depth = 0,
+	}});
 
-				.transform = .{
-					.origin = instance,
-					.xbasis = .{64, 0},
-					.ybasis = .{0, 64},
-				},
+	for (actors.res.instances.values) |instance| {
+		try queue.commands.append(.{.instance_2d = .{
+			.mesh_2d = actors.res.quad_mesh_2d.?,
+			.texture = actors.res.body_texture.?,
+
+			.transform = .{
+				.origin = instance,
+				.xbasis = .{64, 0},
+				.ybasis = .{0, 64},
 			},
-		});
+		}});
 	}
+
+	try queue.commands.append(.{.target = .{
+		.clear_color = null,
+		.clear_depth = null,
+	}});
+
+	try queue.commands.append(.{.instance_2d = .{
+		.mesh_2d = actors.res.quad_mesh_2d.?,
+		.texture = actors.res.render_texture.?,
+
+		.transform = .{
+			.origin = .{@floatFromInt(display.res.width / 2), @floatFromInt(display.res.height / 2)},
+			.xbasis = .{@floatFromInt(display.res.width), 0},
+			.ybasis = .{0, @floatFromInt(display.res.height)},
+		},
+	}});
 }
 
 fn update(player: coral.Read(Player), actors: coral.Write(Actors), mapping: coral.Read(ona.act.Mapping)) !void {
 	actors.res.instances.values[0] += .{
-		mapping.res.axis_strength(player.res.move_x),
-		mapping.res.axis_strength(player.res.move_y),
+		mapping.res.axis_strength(player.res.move_x) * 10,
+		mapping.res.axis_strength(player.res.move_y) * 10,
 	};
 }
 

src/ona/gfx.zig

@@ -26,7 +26,7 @@ pub const Assets = struct {
 		};
 	};
 
-	pub fn open_file(self: *Assets, storage: coral.files.Storage, path: []const u8) (OpenError || Format.Error)!Handle {
+	pub fn create_from_file(self: *Assets, storage: coral.files.Storage, path: []const u8) (OpenError || Format.Error)!*Handle {
 		defer {
 			const max_cache_size = 536870912;
 
@@ -40,16 +40,16 @@ pub const Assets = struct {
 				continue;
 			}
 
-			return self.context.open(try format.file_desc(&self.staging_arena, storage, path));
+			return self.context.create(try format.file_desc(&self.staging_arena, storage, path));
 		}
 
-		return .none;
+		return error.FormatUnsupported;
 	}
 
-	pub fn open_quad_mesh_2d(self: *Assets, extents: Point2D) OpenError!Handle {
+	pub fn create_quad_mesh_2d(self: *Assets, extents: Point2D) OpenError!*Handle {
 		const width, const height = extents / @as(Point2D, @splat(2));
 
-		return self.context.open(.{
+		return self.context.create(.{
 			.mesh_2d = .{
 				.indices = &.{0, 1, 2, 0, 2, 3},
 
@@ -66,6 +66,23 @@ pub const Assets = struct {
 
 pub const Color = @Vector(4, f32);
 
+pub const Command = union (enum) {
+	instance_2d: Instance2D,
+	target: Target,
+
+	pub const Instance2D = struct {
+		texture: *Handle,
+		mesh_2d: *Handle,
+		transform: Transform2D,
+	};
+
+	pub const Target = struct {
+		texture: ?*Handle = null,
+		clear_color: ?Color,
+		clear_depth: ?f32,
+	};
+};
+
 pub const Desc = union (enum) {
 	texture: Texture,
 	mesh_2d: Mesh2D,
@@ -81,13 +98,19 @@ pub const Desc = union (enum) {
 	};
 
 	pub const Texture = struct {
-		data: []const coral.io.Byte,
-		width: u16,
 		format: Format,
 		access: Access,
 
-		pub const Access = enum {
-			static,
+		pub const Access = union (enum) {
+			static: struct {
+				width: u16,
+				data: []const coral.io.Byte,
+			},
+
+			render: struct {
+				width: u16,
+				height: u16,
+			},
 		};
 
 		pub const Format = enum {
@@ -109,17 +132,7 @@ pub const Display = struct {
 	clear_color: Color = colors.black,
 };
 
-pub const Handle = enum (usize) {
-	none,
-	_,
-
-	pub fn index(self: Handle) ?usize {
-		return switch (self) {
-			.none => null,
-			_ => @intFromEnum(self) - 1,
-		};
-	}
-};
+pub const Handle = opaque {};
 
 pub const Input = union (enum) {
 	key_up: Key,

src/ona/gfx/formats.zig

@@ -72,10 +72,14 @@ pub fn bmp_file_desc(
 
 	return .{
 		.texture = .{
-			.width = pixel_width,
-			.data = pixels,
 			.format = .rgba8,
-			.access = .static,
+
+			.access = .{
+				.static = .{
+					.width = pixel_width,
+					.data = pixels,
+				},
+			},
 		}
 	};
 }

src/ona/gfx/shaders/default_2d.glsl

@@ -1,5 +1,7 @@
-@header const Vec2 = @Vector(2, f32)
+@header pub const Vec2 = @Vector(2, f32)
+@header pub const Mat4 = [4]@Vector(4, f32)
 @ctype vec2 Vec2
+@ctype mat4 Mat4
 
 @vs vs
 in vec2 mesh_xy;
@@ -12,8 +14,8 @@ in vec4 instance_tint;
 in float instance_depth;
 in vec4 instance_rect;
 
-uniform Screen {
-	vec2 screen_size;
+uniform Projection {
+	mat4 projection;
 };
 
 out vec4 color;
@@ -22,13 +24,10 @@ out vec2 uv;
 void main() {
 	// Calculate the world position of the vertex
 	const vec2 world_position = instance_origin + mesh_xy.x * instance_xbasis + mesh_xy.y * instance_ybasis;
-
-	// Convert world position to normalized device coordinates (NDC)
-	// Assuming the screen coordinates range from (0, 0) to (screen_size.x, screen_size.y)
-	const vec2 ndc_position = (vec2(world_position.x, -world_position.y) / screen_size) * 2.0 - vec2(1.0, -1.0);
+	const vec2 projected_position = (projection * vec4(world_position, 0, 1)).xy;
 
 	// Set the position of the vertex in clip space
-	gl_Position = vec4(ndc_position, instance_depth, 1.0);
+	gl_Position = vec4(projected_position, instance_depth, 1.0);
 	color = instance_tint;
 
 	// Calculate the width and height from left, top, right, bottom configuration