From 3c377106a572aef64dc5951f15da74520d4bbc84 Mon Sep 17 00:00:00 2001
From: samstalhandske <samstalhandske@hotmail.com>
Date: Fri, 6 Feb 2026 02:44:19 +0100
Subject: [PATCH] 'Event_Mouse_Delta', Raw Input, WM_INPUT

---
 window.odin         | 13 ++++++---
 window_windows.odin | 65 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 74 insertions(+), 4 deletions(-)

diff --git a/window.odin b/window.odin
index 8946245..e6f45c1 100644
--- a/window.odin
+++ b/window.odin
@@ -11,6 +11,8 @@ Window :: struct {
     backend: Backend_Info,
 
     event_queue: Event_Queue,
+
+    mouse_delta: [2]i32,
 }
 
 Event_Queue :: queue.Queue(Event)
@@ -52,12 +54,16 @@ Event_Keyboard :: struct {
 Event_Mouse :: union {
     Event_Mouse_Move,
     Event_Mouse_Button,
+    Event_Mouse_Delta,
 }
 Event_Mouse_Move :: struct {
     x, y: u16,
 }
 Mouse_Button :: enum { Left, Middle, Right }
 Event_Mouse_Button :: struct { button: Mouse_Button, state: Event_Input_State }
+Event_Mouse_Delta :: struct {
+    x, y: i32,
+}
 
 Event_Input :: union {
     Event_Keyboard,
@@ -126,11 +132,12 @@ cursor_visible :: proc(window: ^Window) -> bool {
     return false
 }
 
-set_cursor_position :: proc(window: ^Window, pos: [2]u32) {
-    // fmt.printfln("Set cursor pos: %v:%v", pos.x, pos.y)
+lock_cursor :: proc(window: ^Window, lock: bool) {
     when ODIN_OS == .Windows {
-        set_cursor_position_windows(window, pos)
+        lock_cursor_windows(window, lock)
     }
+
+    show_cursor_window(window, !lock)
 }
 
 get_pointer_to_surface :: proc(window: ^Window) -> rawptr {
diff --git a/window_windows.odin b/window_windows.odin
index 3ea0bff..d9ad5a7 100644
--- a/window_windows.odin
+++ b/window_windows.odin
@@ -65,6 +65,33 @@ Backend_Info :: struct {
             return 0
         }
         // Mouse.
+        case win.WM_INPUT: {
+            dwSize: win.UINT = size_of(win.RAWINPUT)
+            lpb: [size_of(win.RAWINPUT)]u8
+
+            v := win.GetRawInputData(
+                win.HRAWINPUT(lparam),
+                win.RID_INPUT,
+                &lpb[0],
+                &dwSize,
+                size_of(win.RAWINPUTHEADER),
+            )
+            
+            raw := (^win.RAWINPUT)(&lpb[0])
+
+            if raw.header.dwType == win.RIM_TYPEMOUSE {
+                mouse_event: Event_Mouse = Event_Mouse_Delta {
+                    x = i32(raw.data.mouse.lLastX),
+                    y = i32(raw.data.mouse.lLastY),
+                }
+
+                assert(event_queue != nil)
+                queue.push_back(event_queue, Event_Input(mouse_event))
+            }
+
+            return 0
+        }
+
         case win.WM_MOUSEMOVE: {
             x := win.GET_X_LPARAM(lparam)
             y := win.GET_Y_LPARAM(lparam)
@@ -190,6 +217,19 @@ init_window_windows :: proc(window: ^Window) -> bool {
         hwnd = hwnd,
     }
 
+    register_raw_mouse_windows :: proc(hwnd: win.HWND) -> bool {
+        rid := win.RAWINPUTDEVICE {
+            usUsagePage = 0x01, // Generic Desktop Controls.
+            usUsage     = 0x02, // Mouse.
+            dwFlags     = win.RIDEV_INPUTSINK,
+            hwndTarget  = hwnd,
+        }
+
+        ok := win.RegisterRawInputDevices(&rid, 1, size_of(win.RAWINPUTDEVICE))
+        return ok != win.FALSE
+    }
+    assert(register_raw_mouse_windows(hwnd))
+
     // fmt.printfln("Window size: %vx%v.", actual_window_width, actual_window_height)
 
 	return true
@@ -229,7 +269,7 @@ cursor_visible_windows :: proc(window: ^Window) -> bool {
     return old_count >= 0
 }
 
-set_cursor_position_windows :: proc(window: ^Window, pos: [2]u32) {
+set_cursor_position_windows :: proc(window: ^Window, pos: [2]u16) {
     pt := win.POINT { x = i32(pos.x), y = i32(pos.y) }
     rect: win.RECT
     win.GetClientRect(window.backend.hwnd, &rect)
@@ -242,6 +282,29 @@ set_cursor_position_windows :: proc(window: ^Window, pos: [2]u32) {
     win.SetCursorPos(pt.x, pt.y)
 }
 
+lock_cursor_windows :: proc(window: ^Window, lock: bool) {
+    assert(window != nil)
+
+    if lock {
+        rect: win.RECT
+        win.GetClientRect(window.backend.hwnd, &rect)
+
+        pt := win.POINT{rect.left, rect.top}
+        win.ClientToScreen(window.backend.hwnd, &pt)
+        rect.left = pt.x
+        rect.top  = pt.y
+
+        pt = win.POINT{rect.right, rect.bottom}
+        win.ClientToScreen(window.backend.hwnd, &pt)
+        rect.right  = pt.x
+        rect.bottom = pt.y
+
+        win.ClipCursor(&rect)
+    } else {
+        win.ClipCursor(nil)
+    }
+}
+
 update_windows :: proc(window: ^Window) {
     assert(window != nil)