Implemented keyboard input

build.zig

@@ -77,9 +77,11 @@ pub fn build(b: *std.Build) void {
             if (wayland) {
                 exe.root_module.addIncludePath(b.path("ext"));
                 exe.linkSystemLibrary("wayland-client");
+                exe.linkSystemLibrary("xkbcommon");
                 exe.root_module.addCSourceFile(.{ .file = b.path("ext/xdg-shell.c") });
             } else {
                 exe.linkSystemLibrary("xcb");
+                exe.linkSystemLibrary("xcb-keysyms");
                 exe.linkSystemLibrary("xcb-icccm");
             }
             b.installArtifact(exe);

src/ecs/Input.zig

@@ -22,32 +22,32 @@ pub const KeyCode = enum(u32) {
     @"9" = 57,
     semicolon = 59,
     equal = 61,
-    a = 65,
+    a = 97,
-    b = 66,
+    b = 98,
-    c = 67,
+    c = 99,
-    d = 68,
+    d = 100,
-    e = 69,
+    e = 101,
-    f = 70,
+    f = 102,
-    g = 71,
+    g = 103,
-    h = 72,
+    h = 104,
-    i = 73,
+    i = 105,
-    j = 74,
+    j = 106,
-    k = 75,
+    k = 107,
-    l = 76,
+    l = 108,
-    m = 77,
+    m = 109,
-    n = 78,
+    n = 110,
-    o = 79,
+    o = 111,
-    p = 80,
+    p = 112,
-    q = 81,
+    q = 113,
-    r = 82,
+    r = 114,
-    s = 83,
+    s = 115,
-    t = 84,
+    t = 116,
-    u = 85,
+    u = 117,
-    v = 86,
+    v = 118,
-    w = 87,
+    w = 119,
-    x = 88,
+    x = 120,
-    y = 89,
+    y = 121,
-    z = 90,
+    z = 122,
     left_bracket = 91,
     backslash = 92,
     right_bracket = 93,
@@ -124,6 +124,7 @@ pub const KeyCode = enum(u32) {
     right_alt = 346,
     right_super = 347,
     menu = 348,
+    _,
 };
 
 key_pressed: [@intFromEnum(KeyCode.menu)]bool = .{false} ** @intFromEnum(Input.KeyCode.menu),

src/ecs/entities.zig

@@ -13,10 +13,10 @@ pub const SystemGroup = []const System;
 pub const SyncGroup = []const System;
 
 pub const Resources = struct {
-    camera: Camera,
+    camera: *Camera,
     renderer: *Renderer,
-    input: Input,
+    input: *Input,
-    delta_time: f64 = 0.0,
+    delta_time: f32 = 0.0,
 };
 
 pub const Human = struct {

src/math.zig

@@ -47,8 +47,7 @@ pub const Matrix = extern struct {
 
     pub fn lookAt(eye: [3]f32, target: [3]f32, arbitrary_up: [3]f32) Matrix {
         const t: @Vector(3, f32) = target;
-        var e: @Vector(3, f32) = eye;
+        const e: @Vector(3, f32) = eye;
-        e = -e;
         const u: @Vector(3, f32) = arbitrary_up;
         const forward = normalize(t - e);
         const right = normalize(cross(forward, u));

src/rendering/Camera.zig

@@ -12,32 +12,39 @@ pub const Uniform = struct {
 };
 
 position: @Vector(3, f32),
-target: @Vector(3, f32) = .{ 0.0, 0.0, 0.0 },
+target: @Vector(3, f32) = .{ 0.0, 0.0, -1.0 },
-front: @Vector(3, f32) = .{ 0.0, 0.0, 1.0 },
 up: @Vector(3, f32) = .{ 0.0, 1.0, 0.0 },
-speed: f32 = 2.5,
+speed: f32 = 5,
 
 pub fn getProjection(width: usize, height: usize) math.Matrix {
     return math.Matrix.perspective(math.rad(45.0), (@as(f32, @floatFromInt(width)) / @as(f32, @floatFromInt(height))), 0.1, 100.0);
 }
 
-pub fn getView(self: Camera) math.Matrix {
+pub fn getView(self: *Camera) math.Matrix {
-    return math.Matrix.lookAt(self.position, self.target, self.up);
+    return math.Matrix.lookAt(self.position, self.position + self.target, self.up);
 }
 
-pub fn moveCamera(pool: *ecs.Pool) void {
+pub fn moveCamera(pool: *ecs.Pool) !void {
     const input = pool.resources.input;
-    const camera = pool.resources.camera;
+    var camera = pool.resources.camera;
+    const mul = @as(@Vector(3, f32), @splat(camera.speed * pool.resources.delta_time));
+
     if (input.isKeyDown(.w)) {
-        camera.position += (camera.front * (camera.speed * pool.resources.delta_time));
+        camera.position += camera.target * mul;
     }
     if (input.isKeyDown(.s)) {
-        camera.position -= (camera.front * (camera.speed * pool.resources.delta_time));
+        camera.position -= camera.target * mul;
     }
     if (input.isKeyDown(.a)) {
-        camera.position -= math.normalize(math.cross(camera.front, camera.up)) * (camera.speed * pool.resources.delta_time);
+        camera.position -= math.normalize(math.cross(camera.target, camera.up)) * mul;
     }
     if (input.isKeyDown(.d)) {
-        camera.position += math.normalize(math.cross(camera.front, camera.up)) * (camera.speed * pool.resources.delta_time);
+        camera.position += math.normalize(math.cross(camera.target, camera.up)) * mul;
+    }
+    if (input.isKeyDown(.space)) {
+        camera.position += camera.up * mul;
+    }
+    if (input.isKeyDown(.left_shift)) {
+        camera.position -= camera.up * mul;
     }
 }

src/rendering/PhysicalDevice.zig

@@ -185,6 +185,7 @@ pub fn create_device(self: *PhysicalDevice, surface: vk.Surface, allocator: Allo
         samples = 2;
     }
 
+
     std.debug.print("Using {} samples for MSAA\n", .{samples});
 
     return .{

src/rendering/Renderer.zig

@@ -109,10 +109,12 @@ pub fn render(pool: *ecs.Pool) anyerror!void {
 
     const now = try std.time.Instant.now();
     const delta_time: f32 = @as(f32, @floatFromInt(now.since(renderer.previous_time))) / @as(f32, 1_000_000_000.0);
+    pool.resources.delta_time = delta_time;
     renderer.previous_time = now;
 
+    const view = camera.getView();
     const view_memory = renderer.graphics_pipeline.view_memory;
-    @memcpy(view_memory[0..@sizeOf(math.Matrix)], std.mem.asBytes(&camera.getView()));
+    @memcpy(view_memory[0..@sizeOf(math.Matrix)], std.mem.asBytes(&view));
 
     const view_pos_memory = renderer.graphics_pipeline.view_pos_memory;
     const view_pos: [*]f32 = @alignCast(@ptrCast(view_pos_memory));
@@ -120,8 +122,6 @@ pub fn render(pool: *ecs.Pool) anyerror!void {
     view_pos[1] = camera.position[1];
     view_pos[2] = camera.position[2];
 
-    _ = delta_time;
-
     const transform_memory = renderer.graphics_pipeline.transform_buffer.mapped_memory;
 
     try renderer.device.waitFence(renderer.current_frame);

src/sideros.zig

@@ -14,6 +14,10 @@ var gpa = std.heap.GeneralPurposeAllocator(.{}){};
 const allocator = gpa.allocator();
 var pool: ecs.Pool = undefined;
 var renderer: Renderer = undefined;
+var camera: rendering.Camera = .{
+    .position = .{ 0.0, 0.0, 5.0 },
+};
+var input: ecs.Input = .{ .key_pressed = .{false} ** @intFromEnum(ecs.Input.KeyCode.menu) };
 var resources: ecs.Resources = undefined;
 
 fn init_mods() void {
@@ -47,18 +51,15 @@ fn init_mods() void {
 
 export fn sideros_init(init: api.GameInit) callconv(.c) void {
     resources = .{
-        .camera = .{
+        .camera = &camera,
-            .position = .{ 0.0, 5.0, -5.0 },
-            .target = .{ 0.0, 0.0, 0.0 },
-        },
         .renderer = undefined,
-        .input = .{ .key_pressed = .{false} ** @intFromEnum(ecs.Input.KeyCode.menu) },
+        .input = &input,
     };
 
     pool = ecs.Pool.init(allocator, &resources) catch @panic("TODO: Gracefully handle error");
     // TODO(ernesto): I think this @ptrCast are unavoidable but maybe not?
     renderer = Renderer.init(allocator, @ptrCast(init.instance), @ptrCast(init.surface)) catch @panic("TODO: Gracefully handle error");
-    pool.addSystemGroup(&[_]ecs.System{Renderer.render}, true) catch @panic("TODO: Gracefuly handle error");
+    pool.addSystemGroup(&[_]ecs.System{Renderer.render, rendering.Camera.moveCamera}, true) catch @panic("TODO: Gracefuly handle error");
     pool.resources.renderer = &renderer;
     pool.tick();
     init_mods();
@@ -74,3 +75,13 @@ export fn sideros_cleanup() callconv(.c) void {
     pool.deinit();
     if (gpa.deinit() != .ok) @panic("Memory leaked");
 }
+
+export fn sideros_key_callback(key: u32, release: bool) callconv(.c) void {
+    if (key <= @intFromEnum(ecs.Input.KeyCode.menu) and key >= @intFromEnum(ecs.Input.KeyCode.space)) {
+        if (release) {
+            input.key_pressed[key] = false;
+        } else {
+            input.key_pressed[key] = true;
+        }
+    }
+}

src/sideros_api.h

@@ -1,14 +1,16 @@
 #include "vulkan/vulkan.h"
+#include <stdbool.h>
 
 typedef struct {
-  VkInstance instance;
+	VkInstance instance;
-  VkSurfaceKHR surface;
+	VkSurfaceKHR surface;
 } GameInit;
 
 typedef struct {
-  double dt;
+	double dt;
 } GameUpdate;
 
 void sideros_init(GameInit init);
 void sideros_update(GameUpdate state);
+void sideros_key_callback(unsigned int key, bool release);
 void sideros_cleanup(void);

src/wayland.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 const c = @cImport({
     @cInclude("wayland-client.h");
     @cInclude("xdg-shell.h");
+    @cInclude("xkbcommon/xkbcommon.h");
     @cInclude("vulkan/vulkan.h");
     @cInclude("vulkan/vulkan_wayland.h");
 });
@@ -16,11 +17,22 @@ var quit = false;
 var new_width: u32 = 0;
 var new_height: u32 = 0;
 
+fn mapKeysym(keysym: u32) u32 {
+    return switch (keysym) {
+        0xffe1 => 340,
+        else => keysym,
+    };
+}
+
 const State = struct {
     compositor: ?*c.wl_compositor = null,
     shell: ?*c.xdg_wm_base = null,
     surface: ?*c.wl_surface = null,
+    seat: ?*c.wl_seat = null,
     configured: bool = false,
+    xkb_context: ?*c.xkb_context = null,
+    xkb_state: ?*c.xkb_state = null,
+    allocator: std.mem.Allocator,
 };
 
 const validation_layers: []const [*c]const u8 = if (!debug) &[0][*c]const u8{} else &[_][*c]const u8{
@@ -156,6 +168,8 @@ fn registryHandleGlobal(data: ?*anyopaque, registry: ?*c.wl_registry, name: u32,
     } else if (std.mem.eql(u8, @as([:0]const u8, std.mem.span(interface)), std.mem.span(c.xdg_wm_base_interface.name))) {
         state.shell = @ptrCast(c.wl_registry_bind(registry.?, name, &c.xdg_wm_base_interface, 4));
         _ = c.xdg_wm_base_add_listener(state.shell, &shell_listener, null);
+    } else if (std.mem.eql(u8, @as([:0]const u8, std.mem.span(interface)), std.mem.span(c.wl_seat_interface.name))) {
+        state.seat = @ptrCast(c.wl_registry_bind(registry.?, name, &c.wl_seat_interface, 4));
     }
 }
 
@@ -216,6 +230,62 @@ fn frameHandleDone(data: ?*anyopaque, callback: ?*c.wl_callback, time: u32) call
     _ = c.wl_surface_commit(state.surface);
 }
 
+fn keyboardHandleKeymap(data: ?*anyopaque, keyboard: ?*c.wl_keyboard, format: u32, fd: i32, size: u32) callconv(.c) void {
+    _ = keyboard;
+    _ = format;
+
+    const state: *State = @alignCast(@ptrCast(data));
+
+    const addr = std.posix.mmap(null, size, std.posix.PROT.READ, std.os.linux.MAP { .TYPE = .PRIVATE }, fd, 0) catch @panic("Can't mmap keymap data");
+    const mapped: []u8 = @as([*]u8, @ptrCast(addr))[0..size];
+
+    const keymap = c.xkb_keymap_new_from_string(state.xkb_context, @ptrCast(mapped), c.XKB_KEYMAP_FORMAT_TEXT_V1, c.XKB_KEYMAP_COMPILE_NO_FLAGS);
+    state.xkb_state = c.xkb_state_new(keymap);
+}
+
+fn keyboardHandleEnter(data: ?*anyopaque, keyboard: ?*c.wl_keyboard, serial: u32, surface: ?*c.wl_surface, keys: ?*c.wl_array) callconv(.c) void {
+    _ = data;
+    _ = keyboard;
+    _ = serial;
+    _ = surface;
+    _ = keys;
+}
+
+fn keyboardHandleLeave(data: ?*anyopaque, keyboard: ?*c.wl_keyboard, serial: u32, surface: ?*c.wl_surface) callconv(.c) void {
+    _ = data;
+    _ = keyboard;
+    _ = serial;
+    _ = surface;
+}
+
+fn keyboardHandleKey(data: ?*anyopaque, keyboard: ?*c.wl_keyboard, serial: u32, time: u32, key: u32, s: u32) callconv(.c) void {
+    _ = keyboard;
+    _ = serial;
+    _ = time;
+
+    const state: *State = @alignCast(@ptrCast(data));
+
+    const keysym = c.xkb_state_key_get_one_sym(state.xkb_state, key+8);
+    sideros.sideros_key_callback(mapKeysym(keysym), s == 0);
+}
+
+fn keyboardHandleModifiers(data: ?*anyopaque, keyboard: ?*c.wl_keyboard, serial: u32, mods_depressed: u32, mods_latched: u32, mods_locked: u32, group: u32) callconv(.c) void {
+    _ = data;
+    _ = keyboard;
+    _ = serial;
+    _ = mods_depressed;
+    _ = mods_latched;
+    _ = mods_locked;
+    _ = group;
+}
+
+fn keyboardHandleRepeatInfo(data: ?*anyopaque, keyboard: ?*c.wl_keyboard, rate: i32, delay: i32) callconv(.c) void {
+    _ = data;
+    _ = keyboard;
+    _ = rate;
+    _ = delay;
+}
+
 const frame_listener: c.wl_callback_listener = .{
     .done = frameHandleDone,
 };
@@ -239,8 +309,22 @@ const registry_listener: c.wl_registry_listener = .{
     .global_remove = registryHandleGlobalRemove,
 };
 
+const keyboard_listener: c.wl_keyboard_listener = .{
+    .keymap = keyboardHandleKeymap,
+    .enter = keyboardHandleEnter,
+    .leave = keyboardHandleLeave,
+    .key = keyboardHandleKey,
+    .modifiers = keyboardHandleModifiers,
+    .repeat_info = keyboardHandleRepeatInfo,
+};
+
 pub fn main() !void {
-    var state: State = .{};
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer if (gpa.deinit() != .ok) @panic("Platform memory leaked");
+
+    var state: State = .{ .allocator = allocator };
+    state.xkb_context = c.xkb_context_new(c.XKB_CONTEXT_NO_FLAGS);
     const display = c.wl_display_connect(null);
     defer c.wl_display_disconnect(display);
     if (display == null) {
@@ -251,6 +335,9 @@ pub fn main() !void {
     _ = c.wl_registry_add_listener(registry, &registry_listener, @ptrCast(&state));
     _ = c.wl_display_roundtrip(display);
 
+    const keyboard = c.wl_seat_get_keyboard(state.seat);
+    _ = c.wl_keyboard_add_listener(keyboard, &keyboard_listener, @ptrCast(&state));
+
     const surface = c.wl_compositor_create_surface(state.compositor);
     const xdg_surface = c.xdg_wm_base_get_xdg_surface(state.shell, surface);
     _ = c.xdg_surface_add_listener(xdg_surface, &surface_listener, @ptrCast(&state));
@@ -272,9 +359,6 @@ pub fn main() !void {
     }
 
 
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    const allocator = gpa.allocator();
-    defer if (gpa.deinit() != .ok) @panic("Platform memory leaked");
 
     const gameInit = try vulkan_init(allocator, display, surface);
     defer vulkan_cleanup(gameInit);

src/xorg.zig

@@ -4,6 +4,7 @@ const sideros = @cImport({
 });
 const c = @cImport({
     @cInclude("xcb/xcb.h");
+    @cInclude("xcb/xcb_keysyms.h");
     @cInclude("vulkan/vulkan.h");
     @cInclude("vulkan/vulkan_xcb.h");
     @cInclude("xcb/xcb_icccm.h");
@@ -138,13 +139,15 @@ fn vulkan_cleanup(gameInit: sideros.GameInit) void {
 pub fn main() !void {
     const connection = c.xcb_connect(null, null);
     defer c.xcb_disconnect(connection);
+    const keysyms = c.xcb_key_symbols_alloc(connection);
+    defer c.xcb_key_symbols_free(keysyms);
 
     const setup = c.xcb_get_setup(connection);
     const iter = c.xcb_setup_roots_iterator(setup);
     const screen = iter.data;
 
     const mask = c.XCB_CW_EVENT_MASK;
-    const value = c.XCB_EVENT_MASK_EXPOSURE;
+    const value = c.XCB_EVENT_MASK_EXPOSURE | c.XCB_EVENT_MASK_KEY_PRESS | c.XCB_EVENT_MASK_KEY_RELEASE;
 
     const window = c.xcb_generate_id(connection);
     _ = c.xcb_create_window(connection, c.XCB_COPY_FROM_PARENT, window, screen.*.root, 0, 0, 800, 600, 10, c.XCB_WINDOW_CLASS_INPUT_OUTPUT, screen.*.root_visual, mask, &value);
@@ -170,6 +173,16 @@ pub fn main() !void {
     while (true) {
         if (c.xcb_poll_for_event(connection)) |e| {
             switch (e.*.response_type & ~@as(u32, 0x80)) {
+                c.XCB_KEY_PRESS => {
+                    const ev: *c.xcb_key_press_event_t = @ptrCast(e);
+                    const key = c.xcb_key_symbols_get_keysym(keysyms, ev.detail, 0);
+                    sideros.sideros_key_callback(key, false);
+                },
+                c.XCB_KEY_RELEASE => {
+                    const ev: *c.xcb_key_release_event_t = @ptrCast(e);
+                    const key = c.xcb_key_symbols_get_keysym(keysyms, ev.detail, 0);
+                    sideros.sideros_key_callback(key, false);
+                },
                 else => {},
             }
             std.c.free(e);