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Lightly refactor emulator joystick API in preparation for more comprehensive refactor

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This commit is contained in:
Aaron Culliney 2015-12-19 13:01:28 -08:00
parent a1fbc63f98
commit d69b416c58
3 changed files with 73 additions and 33 deletions
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36
Apple2Mac/Apple2Mac/Classes/OSX/EmulatorJoystickController.m
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@ -127,26 +127,6 @@ void gldriver_joystick_reset(void) {
#pragma mark NSObject(DDHidJoystickDelegate)
#define DDHID_JOYSTICK_NORMALIZER ((float)JOY_RANGE/(DDHID_JOYSTICK_VALUE_MAX*2))
#define QUARTER_JOY (HALF_JOY_RANGE>>1)
static inline void clampBeyondRadius(void) {
CGFloat half_x = joy_x - HALF_JOY_RANGE;
CGFloat half_y = joy_y - HALF_JOY_RANGE;
CGFloat r = sqrtf(half_x*half_x + half_y*half_y);
bool shouldClip = (r > HALF_JOY_RANGE);
if (joy_clip_to_radius && shouldClip) {
if (joy_x < HALF_JOY_RANGE) {
joy_x = (joy_x < QUARTER_JOY) ? 0.f : joy_x;
} else {
joy_x = (joy_x < HALF_JOY_RANGE+QUARTER_JOY) ? joy_x : JOY_RANGE-1;
}
if (joy_y < HALF_JOY_RANGE) {
joy_y = (joy_y < QUARTER_JOY) ? 0.f : joy_y;
} else {
joy_y = (joy_y < HALF_JOY_RANGE+QUARTER_JOY) ? joy_y : JOY_RANGE-1;
}
}
}
- (void)ddhidJoystick:(DDHidJoystick *)joystick stick:(unsigned int)stick xChanged:(int)value
{
@ -156,12 +136,8 @@ static inline void clampBeyondRadius(void) {
}
#endif
joy_x = (uint16_t)((value+DDHID_JOYSTICK_VALUE_MAX) * DDHID_JOYSTICK_NORMALIZER);
if (joy_x > 0xFF) {
joy_x = 0xFF;
}
clampBeyondRadius();
uint8_t x = (uint8_t)((value+DDHID_JOYSTICK_VALUE_MAX) * DDHID_JOYSTICK_NORMALIZER);
joydriver_setAxisValue(x, joydriver_getAxisY());
}
- (void)ddhidJoystick:(DDHidJoystick *)joystick stick:(unsigned int)stick yChanged:(int)value
@ -172,12 +148,8 @@ static inline void clampBeyondRadius(void) {
}
#endif
joy_y = (uint16_t)((value+DDHID_JOYSTICK_VALUE_MAX) * DDHID_JOYSTICK_NORMALIZER);
if (joy_y > 0xFF) {
joy_y = 0xFF;
}
clampBeyondRadius();
uint8_t y = (uint8_t)((value+DDHID_JOYSTICK_VALUE_MAX) * DDHID_JOYSTICK_NORMALIZER);
joydriver_setAxisValue(joydriver_getAxisX(), y);
}
- (void)ddhidJoystick:(DDHidJoystick *)joystick stick:(unsigned int)stick otherAxis:(unsigned)otherAxis valueChanged:(int)value

49
src/joystick.c
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@ -253,6 +253,55 @@ void c_joystick_reset(void)
#endif
}
// clamps modern gamepad controller axis values to the "corners" of a traditional joystick as used on the Apple //e
static inline void clampBeyondRadius(uint8_t *x, uint8_t *y) {
float half_x = (*x) - HALF_JOY_RANGE;
float half_y = (*y) - HALF_JOY_RANGE;
float r = sqrtf(half_x*half_x + half_y*half_y);
bool shouldClip = (r > HALF_JOY_RANGE);
if (joy_clip_to_radius && shouldClip) {
if ((*x) < HALF_JOY_RANGE) {
(*x) = ((*x) < QUARTER_JOY_RANGE) ? 0.f : (*x);
} else {
(*x) = ((*x) < HALF_JOY_RANGE+QUARTER_JOY_RANGE) ? (*x) : 0xFF;
}
if ((*y) < HALF_JOY_RANGE) {
(*y) = ((*y) < QUARTER_JOY_RANGE) ? 0.f : (*y);
} else {
(*y) = ((*y) < HALF_JOY_RANGE+QUARTER_JOY_RANGE) ? (*y) : JOY_RANGE-1;
}
}
}
void joydriver_setClampBeyondRadius(bool clamp) {
joy_clip_to_radius = clamp;
}
void joydriver_setAxisValue(uint8_t x, uint8_t y) {
clampBeyondRadius(&x, &y);
joy_x = x;
joy_y = y;
}
uint8_t joydriver_getAxisX(void) {
return joy_x;
}
// return Y axis value
uint8_t joydriver_getAxisY(void) {
return joy_y;
}
// set button 0 pressed
void joydriver_setButton0Pressed(bool pressed) {
joy_button0 = (pressed) ? 0x80 : 0x0;
}
// set button 1 pressed
void joydriver_setButton1Pressed(bool pressed) {
joy_button1 = (pressed) ? 0x80 : 0x0;
}
#if INTERFACE_TOUCH
bool (*joydriver_isTouchJoystickAvailable)(void) = NULL;
void (*joydriver_setTouchJoystickEnabled)(bool enabled) = NULL;

21
src/joystick.h
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@ -13,7 +13,8 @@
#define _JOYSTICK_H_
#define JOY_RANGE 0x100
#define HALF_JOY_RANGE 0x80
#define HALF_JOY_RANGE (JOY_RANGE>>1)
#define QUARTER_JOY_RANGE (HALF_JOY_RANGE>>1)
extern uint16_t joy_x;
extern uint16_t joy_y;
@ -32,6 +33,24 @@ void c_joystick_reset(void);
void c_calibrate_joystick(void);
#endif
// enable/disable gamepad clamping to joystick corners
void joydriver_setClampBeyondRadius(bool clamp);
// set joystick axis values
void joydriver_setAxisValue(uint8_t x, uint8_t y);
// return X axis value
uint8_t joydriver_getAxisX(void);
// return Y axis value
uint8_t joydriver_getAxisY(void);
// set button 0 pressed
void joydriver_setButton0Pressed(bool pressed);
// set button 1 pressed
void joydriver_setButton1Pressed(bool pressed);
#if INTERFACE_TOUCH
typedef enum touchjoy_variant_t {