input: sdl2: Fix relative mode to match SDL1 behavior

Right now relative mode accelerates too fast, and has the 'invisible wall'
problem. SDL2 added an explicit API to handle this use case, so let's use
it.

Signed-off-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

configure

@@ -1448,7 +1448,7 @@ done
 if test "$stack_protector" != "no" ; then
   gcc_flags="-fstack-protector-strong -fstack-protector-all"
   for flag in $gcc_flags; do
-    if compile_prog "-Werror $flag" "" ; then
+    if do_cc $QEMU_CFLAGS -Werror $flag -c -o $TMPO $TMPC ; then
       QEMU_CFLAGS="$QEMU_CFLAGS $flag"
       LIBTOOLFLAGS="$LIBTOOLFLAGS -Wc,$flag"
       break

hw/i386/acpi-dsdt.hex.generated

@@ -3,12 +3,12 @@ static unsigned char AcpiDsdtAmlCode[] = {
 0x53,
 0x44,
 0x54,
-0x85,
+0x80,
 0x11,
 0x0,
 0x0,
 0x1,
-0x8b,
+0x60,
 0x42,
 0x58,
 0x50,
@@ -31,8 +31,8 @@ static unsigned char AcpiDsdtAmlCode[] = {
 0x4e,
 0x54,
 0x4c,
-0x23,
-0x8,
+0x15,
+0x11,
 0x13,
 0x20,
 0x10,
@@ -4010,7 +4010,7 @@ static unsigned char AcpiDsdtAmlCode[] = {
 0x53,
 0x1,
 0x10,
-0x47,
+0x42,
 0x11,
 0x5f,
 0x53,
@@ -4243,7 +4243,7 @@ static unsigned char AcpiDsdtAmlCode[] = {
 0x60,
 0x5b,
 0x82,
-0x2e,
+0x29,
 0x50,
 0x52,
 0x45,
@@ -4253,16 +4253,11 @@ static unsigned char AcpiDsdtAmlCode[] = {
 0x48,
 0x49,
 0x44,
-0xd,
+0xc,
 0x41,
-0x43,
-0x50,
-0x49,
-0x30,
-0x30,
-0x30,
-0x34,
-0x0,
+0xd0,
+0xa,
+0x6,
 0x8,
 0x5f,
 0x43,

hw/i386/q35-acpi-dsdt.hex.generated

@@ -3,12 +3,12 @@ static unsigned char Q35AcpiDsdtAmlCode[] = {
 0x53,
 0x44,
 0x54,
-0xd7,
+0xd2,
 0x1c,
 0x0,
 0x0,
 0x1,
-0x3e,
+0x13,
 0x42,
 0x58,
 0x50,
@@ -31,8 +31,8 @@ static unsigned char Q35AcpiDsdtAmlCode[] = {
 0x4e,
 0x54,
 0x4c,
-0x23,
-0x8,
+0x15,
+0x11,
 0x13,
 0x20,
 0x10,
@@ -6959,7 +6959,7 @@ static unsigned char Q35AcpiDsdtAmlCode[] = {
 0x53,
 0x1,
 0x10,
-0x47,
+0x42,
 0x11,
 0x5f,
 0x53,
@@ -7192,7 +7192,7 @@ static unsigned char Q35AcpiDsdtAmlCode[] = {
 0x60,
 0x5b,
 0x82,
-0x2e,
+0x29,
 0x50,
 0x52,
 0x45,
@@ -7202,16 +7202,11 @@ static unsigned char Q35AcpiDsdtAmlCode[] = {
 0x48,
 0x49,
 0x44,
-0xd,
+0xc,
 0x41,
-0x43,
-0x50,
-0x49,
-0x30,
-0x30,
-0x30,
-0x34,
-0x0,
+0xd0,
+0xa,
+0x6,
 0x8,
 0x5f,
 0x43,

ui/sdl2.c

@@ -278,7 +278,7 @@ static void sdl_hide_cursor(void)
         SDL_ShowCursor(1);
         SDL_SetCursor(sdl_cursor_hidden);
     } else {
-        SDL_ShowCursor(0);
+        SDL_SetRelativeMouseMode(SDL_TRUE);
     }
 }
 
@@ -289,6 +289,7 @@ static void sdl_show_cursor(void)
     }
 
     if (!qemu_input_is_absolute()) {
+        SDL_SetRelativeMouseMode(SDL_FALSE);
         SDL_ShowCursor(1);
         if (guest_cursor &&
             (gui_grab || qemu_input_is_absolute() || absolute_enabled)) {
@@ -403,13 +404,17 @@ static void sdl_send_mouse_event(struct sdl2_state *scon, int dx, int dy,
         }
         qemu_input_queue_abs(scon->dcl.con, INPUT_AXIS_X, off_x + x, max_w);
         qemu_input_queue_abs(scon->dcl.con, INPUT_AXIS_Y, off_y + y, max_h);
-    } else if (guest_cursor) {
-        x -= guest_x;
-        y -= guest_y;
-        guest_x += x;
-        guest_y += y;
-        qemu_input_queue_rel(scon->dcl.con, INPUT_AXIS_X, x);
-        qemu_input_queue_rel(scon->dcl.con, INPUT_AXIS_Y, y);
+    } else {
+        if (guest_cursor) {
+            x -= guest_x;
+            y -= guest_y;
+            guest_x += x;
+            guest_y += y;
+            dx = x;
+            dy = y;
+        }
+        qemu_input_queue_rel(scon->dcl.con, INPUT_AXIS_X, dx);
+        qemu_input_queue_rel(scon->dcl.con, INPUT_AXIS_Y, dy);
     }
     qemu_input_event_sync();
 }