cleaning up the linux part:

Makefile.engine.linux.mak

@@ -6,7 +6,7 @@ ASSEMBLY := engine
 EXTENSION := .so
 COMPILER_FLAGS := -g -MD -Werror=vla -fdeclspec -fPIC
 INCLUDE_FLAGS := -Iengine/src -I$(VULKAN_SDK)/include
-LINKER_FLAGS := -g -shared -lvulkan -lxcb -lX11 -lX11-xcb -lxkbcommon -L$(VULKAN_SDK)/lib -L/usr/X11R6/lib
+LINKER_FLAGS := -g -shared -lvulkan -lxcb -lxcb-keysyms -lxcb-xkb -L$(VULKAN_SDK)/lib -L/usr/X11R6/lib
 DEFINES := -D_DEBUG -DKEXPORT
 
 # Make does not offer a recursive wildcard function, so here's one:

engine/src/core/application.c

@@ -49,6 +49,8 @@ static application_state* app_state;
 b8 application_on_event(u16 code, void* sender, void* listener_inst, event_context context);
 b8 application_on_key(u16 code, void* sender, void* listener_inst, event_context context);
 b8 application_on_resized(u16 code, void* sender, void* listener_inst, event_context context);
+b8 application_on_minimized(u16 code, void *sender, void *listener_inst, event_context context);
+b8 application_on_raised(u16 code, void *sender, void *listener_inst, event_context context);
 
 b8 application_create(game* game_inst) {
     if (game_inst->application_state) {
@@ -95,6 +97,8 @@ b8 application_create(game* game_inst) {
     event_register(EVENT_CODE_KEY_PRESSED, 0, application_on_key);
     event_register(EVENT_CODE_KEY_RELEASED, 0, application_on_key);
     event_register(EVENT_CODE_RESIZED, 0, application_on_resized);
+    event_register(EVENT_CODE_MINIZED, 0, application_on_minimized);
+    event_register(EVENT_CODE_RAISED, 0, application_on_raised);
 
     // Platform
     platform_system_startup(&app_state->platform_system_memory_requirement, 0, 0, 0, 0, 0, 0);
@@ -206,6 +210,9 @@ b8 application_run() {
     event_unregister(EVENT_CODE_APPLICATION_QUIT, 0, application_on_event);
     event_unregister(EVENT_CODE_KEY_PRESSED, 0, application_on_key);
     event_unregister(EVENT_CODE_KEY_RELEASED, 0, application_on_key);
+    event_unregister(EVENT_CODE_RESIZED, 0, application_on_resized);
+    event_unregister(EVENT_CODE_MINIZED, 0, application_on_minimized);
+    event_unregister(EVENT_CODE_RAISED, 0, application_on_raised);
 
     input_system_shutdown(app_state->input_system_state);
 
@@ -295,4 +302,26 @@ b8 application_on_resized(u16 code, void* sender, void* listener_inst, event_con
 
     // Event purposely not handled to allow other listeners to get this.
     return false;
-}
+}
+
+b8 application_on_minimized(u16 code, void *sender, void *listener_inst, event_context context) {
+    if (code == EVENT_CODE_MINIZED) {
+        if (!app_state->is_suspended) {
+            KDEBUG("Application was minimized and suspended.");
+            app_state->is_suspended = true;
+        }
+    }
+
+    return true;
+}
+
+b8 application_on_raised(u16 code, void *sender, void *listener_inst, event_context context) {
+    if (code == EVENT_CODE_RAISED) {
+        if (app_state->is_suspended) {
+            KDEBUG("Application was raised and unsuspended.");
+            app_state->is_suspended = false;
+        }
+    }
+
+    return true;
+}

engine/src/core/event.h

@@ -108,5 +108,11 @@ typedef enum system_event_code {
      */
     EVENT_CODE_RESIZED = 0x08,
 
+    // Window was minimized
+    EVENT_CODE_MINIZED = 0x09,
+
+    // Window was raised from minimized
+    EVENT_CODE_RAISED = 0x0a,
+
     MAX_EVENT_CODE = 0xFF
 } system_event_code;

engine/src/core/input.h

@@ -12,6 +12,7 @@ typedef enum buttons {
 #define DEFINE_KEY(name, code) KEY_##name = code
 
 typedef enum keys {
+#if KPLATFORM_WINDOWS
     DEFINE_KEY(BACKSPACE, 0x08),
     DEFINE_KEY(ENTER, 0x0D),
     DEFINE_KEY(TAB, 0x09),
@@ -138,7 +139,110 @@ typedef enum keys {
     DEFINE_KEY(PERIOD, 0xBE),
     DEFINE_KEY(SLASH, 0xBF),
     DEFINE_KEY(GRAVE, 0xC0),
-
+#elif KPLATFORM_LINUX
+    DEFINE_KEY(SPACE, 0x0020),
+    DEFINE_KEY(HASH, 0x0023),
+    DEFINE_KEY(APOS, 0x0027),
+    DEFINE_KEY(COMMA, 0x002c),
+    DEFINE_KEY(MINUS, 0x002d),
+    DEFINE_KEY(PERIOD, 0x002e),
+    DEFINE_KEY(SLASH, 0x002f),
+    DEFINE_KEY(0, 0x0030),
+    DEFINE_KEY(1, 0x0031),
+    DEFINE_KEY(2, 0x0032),
+    DEFINE_KEY(3, 0x0033),
+    DEFINE_KEY(4, 0x0034),
+    DEFINE_KEY(5, 0x0035),
+    DEFINE_KEY(6, 0x0036),
+    DEFINE_KEY(7, 0x0037),
+    DEFINE_KEY(8, 0x0038),
+    DEFINE_KEY(9, 0x0039),
+    DEFINE_KEY(SEMICOLON, 0x003b),
+    DEFINE_KEY(EQUAL, 0x003d),
+    DEFINE_KEY(A, 0x0041),
+    DEFINE_KEY(B, 0x0042),
+    DEFINE_KEY(C, 0x0043),
+    DEFINE_KEY(D, 0x0044),
+    DEFINE_KEY(E, 0x0045),
+    DEFINE_KEY(F, 0x0046),
+    DEFINE_KEY(G, 0x0047),
+    DEFINE_KEY(H, 0x0048),
+    DEFINE_KEY(I, 0x0049),
+    DEFINE_KEY(J, 0x004a),
+    DEFINE_KEY(K, 0x004b),
+    DEFINE_KEY(L, 0x004c),
+    DEFINE_KEY(M, 0x004d),
+    DEFINE_KEY(N, 0x004e),
+    DEFINE_KEY(O, 0x004f),
+    DEFINE_KEY(P, 0x0050),
+    DEFINE_KEY(Q, 0x0051),
+    DEFINE_KEY(R, 0x0052),
+    DEFINE_KEY(S, 0x0053),
+    DEFINE_KEY(T, 0x0054),
+    DEFINE_KEY(U, 0x0055),
+    DEFINE_KEY(V, 0x0056),
+    DEFINE_KEY(W, 0x0057),
+    DEFINE_KEY(X, 0x0058),
+    DEFINE_KEY(Y, 0x0059),
+    DEFINE_KEY(Z, 0x005a),
+    DEFINE_KEY(LBRACKET, 0x005b),
+    DEFINE_KEY(BSLASH, 0x005c),
+    DEFINE_KEY(RBRACKET, 0x005d),
+    DEFINE_KEY(GRAVE, 0x0060),
+    DEFINE_KEY(BACKSPACE, 0xff08),
+    DEFINE_KEY(TAB, 0xff09),
+    DEFINE_KEY(ENTER, 0xff0d),
+    DEFINE_KEY(PAUSE, 0xff13),
+    DEFINE_KEY(SCROLL, 0xff14),
+    DEFINE_KEY(ESCAPE, 0xff1b),
+    DEFINE_KEY(HOME, 0xff50),
+    DEFINE_KEY(LEFT, 0xff51),
+    DEFINE_KEY(UP, 0xff52),
+    DEFINE_KEY(RIGHT, 0xff53),
+    DEFINE_KEY(DOWN, 0xff54),
+    DEFINE_KEY(PAGEUP, 0xff55),
+    DEFINE_KEY(PAGEDOWN, 0xff56),
+    DEFINE_KEY(END, 0xff57),
+    DEFINE_KEY(PRINT, 0xff61),
+    DEFINE_KEY(INSERT, 0xff63),
+    DEFINE_KEY(NUMLOCK, 0xff7f),
+    DEFINE_KEY(KP_ENTER, 0xff8d),
+    DEFINE_KEY(KP_7, 0xff95),
+    DEFINE_KEY(KP_4, 0xff96),
+    DEFINE_KEY(KP_8, 0xff97),
+    DEFINE_KEY(KP_6, 0xff98),
+    DEFINE_KEY(KP_2, 0xff99),
+    DEFINE_KEY(KP_9, 0xff9a),
+    DEFINE_KEY(KP_3, 0xff9b),
+    DEFINE_KEY(KP_1, 0xff9c),
+    DEFINE_KEY(KP_5, 0xff9d),
+    DEFINE_KEY(KP_0, 0xff9e),
+    DEFINE_KEY(KP_DECIMAL, 0xff9f ),
+    DEFINE_KEY(KP_MULTIPLY, 0xffaa),
+    DEFINE_KEY(KP_ADD, 0xffab),
+    DEFINE_KEY(KP_SUBTRACT, 0xffad),
+    DEFINE_KEY(KP_DIVIDE, 0xffaf),
+    DEFINE_KEY(F1, 0xffbe),
+    DEFINE_KEY(F2, 0xffbf),
+    DEFINE_KEY(F3, 0xffc0),
+    DEFINE_KEY(F4, 0xffc1),
+    DEFINE_KEY(F5, 0xffc2),
+    DEFINE_KEY(F6, 0xffc3),
+    DEFINE_KEY(F7, 0xffc4),
+    DEFINE_KEY(F8, 0xffc5),
+    DEFINE_KEY(F9, 0xffc6),
+    DEFINE_KEY(F10, 0xffc7),
+    DEFINE_KEY(F11, 0xffc8),
+    DEFINE_KEY(F12, 0xffc9),
+    DEFINE_KEY(LSHIFT, 0xffe1),
+    DEFINE_KEY(RSHIFT, 0xffe2),
+    DEFINE_KEY(LCONTROL, 0xffe3),
+    DEFINE_KEY(RCONTROL, 0xffe4),
+    DEFINE_KEY(CAPSLOCK, 0xffe5),
+    DEFINE_KEY(LALT, 0xffe9),
+    DEFINE_KEY(RALT, 0xfe03),
+    DEFINE_KEY(DELETE, 0xffff),
+#endif
     KEYS_MAX_KEYS
 } keys;