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Support for screen + d-pad rotation using SELECT button

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- pressing SELECT rotates screen
- d-pad mapping rotates together with screen

I've never owned or used LYNX before so this is based on usuability. Not
sure how many games needs needs this rotation feature to merit it as a
core option. Pressing SELECT seems quicker than going to menu.
This commit is contained in:
retro-wertz 2019-02-02 13:58:26 +08:00
parent bd2882cf98
commit 8eacae1eb0
1 changed files with 69 additions and 13 deletions
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82
libretro.cpp
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@ -24,6 +24,9 @@ static bool overscan;
static double last_sound_rate; static double last_sound_rate;
static MDFN_PixelFormat last_pixel_format; static MDFN_PixelFormat last_pixel_format;
static unsigned rot_screen;
static unsigned select_pressed_last_frame;
static MDFN_Surface *surf; static MDFN_Surface *surf;
static bool failed_init; static bool failed_init;
@ -682,6 +685,9 @@ bool retro_load_game(const struct retro_game_info *info)
hookup_ports(true); hookup_ports(true);
rot_screen = 0;
select_pressed_last_frame = 0;
check_variables(); check_variables();
return game; return game;
@ -695,34 +701,84 @@ void retro_unload_game()
MDFNI_CloseGame(); MDFNI_CloseGame();
} }
// Hardcoded for PSX. No reason to parse lots of structures ... // Hardcoded for PSX. No reason to parse lots of structures ...
// See mednafen/psx/input/gamepad.cpp // See mednafen/psx/input/gamepad.cpp
static void update_input(void) static void update_input(void)
{ {
static unsigned map[] = { static unsigned map[4][9] = {
RETRO_DEVICE_ID_JOYPAD_A, {
RETRO_DEVICE_ID_JOYPAD_B, RETRO_DEVICE_ID_JOYPAD_A,
RETRO_DEVICE_ID_JOYPAD_L, RETRO_DEVICE_ID_JOYPAD_B,
RETRO_DEVICE_ID_JOYPAD_R, RETRO_DEVICE_ID_JOYPAD_L,
RETRO_DEVICE_ID_JOYPAD_LEFT, RETRO_DEVICE_ID_JOYPAD_R,
RETRO_DEVICE_ID_JOYPAD_RIGHT, RETRO_DEVICE_ID_JOYPAD_LEFT,
RETRO_DEVICE_ID_JOYPAD_UP, RETRO_DEVICE_ID_JOYPAD_RIGHT,
RETRO_DEVICE_ID_JOYPAD_DOWN, RETRO_DEVICE_ID_JOYPAD_UP,
RETRO_DEVICE_ID_JOYPAD_START, RETRO_DEVICE_ID_JOYPAD_DOWN,
RETRO_DEVICE_ID_JOYPAD_START
},
{
RETRO_DEVICE_ID_JOYPAD_A,
RETRO_DEVICE_ID_JOYPAD_B,
RETRO_DEVICE_ID_JOYPAD_L,
RETRO_DEVICE_ID_JOYPAD_R,
RETRO_DEVICE_ID_JOYPAD_DOWN,
RETRO_DEVICE_ID_JOYPAD_UP,
RETRO_DEVICE_ID_JOYPAD_LEFT,
RETRO_DEVICE_ID_JOYPAD_RIGHT,
RETRO_DEVICE_ID_JOYPAD_START
},
{
RETRO_DEVICE_ID_JOYPAD_A,
RETRO_DEVICE_ID_JOYPAD_B,
RETRO_DEVICE_ID_JOYPAD_L,
RETRO_DEVICE_ID_JOYPAD_R,
RETRO_DEVICE_ID_JOYPAD_RIGHT,
RETRO_DEVICE_ID_JOYPAD_LEFT,
RETRO_DEVICE_ID_JOYPAD_DOWN,
RETRO_DEVICE_ID_JOYPAD_UP,
RETRO_DEVICE_ID_JOYPAD_START
},
{
RETRO_DEVICE_ID_JOYPAD_A,
RETRO_DEVICE_ID_JOYPAD_B,
RETRO_DEVICE_ID_JOYPAD_L,
RETRO_DEVICE_ID_JOYPAD_R,
RETRO_DEVICE_ID_JOYPAD_UP,
RETRO_DEVICE_ID_JOYPAD_DOWN,
RETRO_DEVICE_ID_JOYPAD_RIGHT,
RETRO_DEVICE_ID_JOYPAD_LEFT,
RETRO_DEVICE_ID_JOYPAD_START
},
}; };
for (unsigned j = 0; j < MAX_PLAYERS; j++) for (unsigned j = 0; j < MAX_PLAYERS; j++)
{ {
uint16_t input_state = 0; uint16_t input_state = 0;
for (unsigned i = 0; i < MAX_BUTTONS; i++) for (unsigned i = 0; i < MAX_BUTTONS; i++)
input_state |= input_state_cb(j, RETRO_DEVICE_JOYPAD, 0, map[i]) ? (1 << i) : 0; input_state |= input_state_cb(j, RETRO_DEVICE_JOYPAD, 0, map[rot_screen][i]) ? (1 << i) : 0;
// Input data must be little endian. // Input data must be little endian.
input_buf[j][0] = (input_state >> 0) & 0xff; input_buf[j][0] = (input_state >> 0) & 0xff;
input_buf[j][1] = (input_state >> 8) & 0xff; input_buf[j][1] = (input_state >> 8) & 0xff;
} }
unsigned select_button = input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT);
if (select_button && !select_pressed_last_frame)
{
rot_screen++;
if (rot_screen > 3)
rot_screen = 0;
const float aspect[2] = { (80.0 / 51.0), (51.0 / 80.0) };
const unsigned rot_angle[4] = { 0, 1, 2, 3 };
struct retro_game_geometry new_geom = { FB_WIDTH, FB_HEIGHT, FB_WIDTH, FB_HEIGHT, aspect[rot_screen & 1] };
environ_cb(RETRO_ENVIRONMENT_SET_GEOMETRY, (void*)&new_geom);
environ_cb(RETRO_ENVIRONMENT_SET_ROTATION, (void*)&rot_angle[rot_screen]);
}
select_pressed_last_frame = select_button;
} }
static uint64_t video_frames, audio_frames; static uint64_t video_frames, audio_frames;