Attached is my modified dosdef.moc (you would need to rename it .com to execute it, if you dare!).
It seems to me that the bug is that the function:
static bool joystick_detected()
{
struct joystick joystick;
joystick_read(&joystick);
return joystick.axis[0] != 0 || joystick.axis[1] != 0;
}
in dosdef.c, does not work properly...
I modified it a bit to rather test for AH=0x86 when there is no joystick:
static bool joystick_detected()
{
struct joystick joystick;
joystick_read(&joystick);
return (joystick.axis[0] & 0xff00) != 0x8600;
}
I believe this fix it... a bit.
Here is the referenced function:
static void joystick_read(struct joystick *joystick)
{
asm volatile ("mov $0x84, %%ah\n"
"mov $1, %%dx\n"
"int $0x15\n"
: "=a"(joystick->axis[0]), "=b"(joystick->axis[1]),
"=c"(joystick->axis[2]), "=d"(joystick->axis[3]));
for (int i = 0; i < 4; i++) {
joystick_config.min[i] =
min(joystick_config.min[i], joystick->axis[i]);
joystick_config.max[i] =
max(joystick_config.max[i], joystick->axis[i]);
}
uint16_t buttons = 0;
asm volatile ("mov $0x84, %%ah\n"
"mov $0, %%dx\n"
"int $0x15\n"
: "=a"(buttons)
: /**/
: "bx", "cx", "dx");
for (int i = 0; i < 4; i++)
joystick->button[i] = !(buttons & (1 << (i + 4)));
}
dosdef.moc
Description: Binary data
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