From 6538c9d14d933e9bd161f0a340b6b3df4209eee5 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 11 Feb 2008 21:06:32 +0000
Subject: [PATCH] Windows also remaps the numeric keypad... grrr

---
 src/video/win32/SDL_win32events.c   | 19 ++++++++++++++-----
 src/video/win32/SDL_win32keyboard.c | 10 ++++++++++
 src/video/win32/SDL_win32keyboard.h |  1 +
 3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/src/video/win32/SDL_win32events.c b/src/video/win32/SDL_win32events.c
index db802c2a6..37ba34361 100644
--- a/src/video/win32/SDL_win32events.c
+++ b/src/video/win32/SDL_win32events.c
@@ -33,8 +33,8 @@
 #endif
 
 /* Masks for processing the windows KEYDOWN and KEYUP messages */
-#define REPEATED_KEYMASK	(1<<30)
-#define EXTENDED_KEYMASK	(1<<24)
+#define REPEATED_KEYMASK    (1<<30)
+#define EXTENDED_KEYMASK    (1<<24)
 
 #define VK_ENTER    10  /* Keypad Enter ... no VKEY defined? */
 
@@ -52,13 +52,13 @@
 static WPARAM
 RemapVKEY(WPARAM wParam, LPARAM lParam)
 {
+    int i;
+    BYTE scancode = (BYTE)((lParam >> 16) & 0xFF);
+
     /* Windows remaps alphabetic keys based on current layout.
        We try to provide USB scancodes, so undo this mapping.
      */
     if (wParam >= 'A' && wParam <= 'Z') {
-        BYTE scancode = (BYTE)((lParam >> 16) & 0xFF);
-        int i;
-
         if (scancode != alpha_scancodes[wParam - 'A']) {
             for (i = 0; i < SDL_arraysize(alpha_scancodes); ++i) {
                 if (scancode == alpha_scancodes[i]) {
@@ -68,6 +68,15 @@ RemapVKEY(WPARAM wParam, LPARAM lParam)
             }
         }
     }
+
+    /* Keypad keys are a little trickier, we always scan for them. */
+    for (i = 0; i < SDL_arraysize(keypad_scancodes); ++i) {
+        if (scancode == keypad_scancodes[i]) {
+            wParam = VK_NUMPAD0+i;
+            break;
+        }
+    }
+
     return wParam;
 }
 
diff --git a/src/video/win32/SDL_win32keyboard.c b/src/video/win32/SDL_win32keyboard.c
index 198166071..e185ddf09 100644
--- a/src/video/win32/SDL_win32keyboard.c
+++ b/src/video/win32/SDL_win32keyboard.c
@@ -41,6 +41,9 @@ BYTE alpha_scancodes[26] = {
     30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38, 50, 49, 24,
     25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44
 };
+BYTE keypad_scancodes[10] = {
+    82, 79, 80, 81, 75, 76, 77, 71, 72, 73
+};
 
 void
 WIN_InitKeyboard(_THIS)
@@ -57,6 +60,13 @@ printf("Fixing alpha scancode map, assuming US QWERTY layout!\nPlease send the f
 printf("%d = %d\n", i, alpha_scancodes[i]);
         }
     }
+    if (MapVirtualKey(VK_NUMPAD0, MAPVK_VK_TO_VSC) != keypad_scancodes[0]) {
+printf("Fixing keypad scancode map!\nPlease send the following 10 lines of output to the SDL mailing list <sdl@libsdl.org>, including a description of your keyboard hardware.\n");
+        for (i = 0; i < SDL_arraysize(keypad_scancodes); ++i) {
+            keypad_scancodes[i] = MapVirtualKey(VK_NUMPAD0+i, MAPVK_VK_TO_VSC);
+printf("%d = %d\n", i, keypad_scancodes[i]);
+        }
+    }
 
     data->key_layout = win32_scancode_table;
 
diff --git a/src/video/win32/SDL_win32keyboard.h b/src/video/win32/SDL_win32keyboard.h
index 4cd7391c0..5d23e1101 100644
--- a/src/video/win32/SDL_win32keyboard.h
+++ b/src/video/win32/SDL_win32keyboard.h
@@ -25,6 +25,7 @@
 #define _SDL_win32keyboard_h
 
 extern BYTE alpha_scancodes[26];
+extern BYTE keypad_scancodes[10];
 
 extern void WIN_InitKeyboard(_THIS);
 extern void WIN_UpdateKeymap(int keyboard);