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libretro input: build the joystick list only when a controller layout changes

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osd_get_joy_list() rebuilt the whole list (4 players x all codes) at every
call, and the input code calls it at every key check: about 100 times a
frame, some 750k instructions a frame whatever the game. It is now built
again only when a port's layout changes.

doapp, 600 frames (callgrind): retro_run 15.02 G -> 14.57 G instructions
(-3%), video and audio identical frame by frame. The saving is per frame,
so it is a larger share on lighter games.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MEgow1uRCv8pxMErKhmoHZ
This commit is contained in:
Claude committed 2026-10-21 20:41:26 +02:00
1 parent 81fac8a81a
commit 3c9fe3a43b
1 file changed
+11
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src/mame2003/mame2003.c
+11
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@@ -1167,11 +1167,22 @@ struct JoystickInfo alternate_joystick_maps[MAX_PLAYER_COUNT][IDX_NUMBER_OF_INPU
struct JoystickInfo mame_joy_map[(MAX_PLAYER_COUNT * OSD_INPUT_CODES_PER_PLAYER) + 1] = { { 0 } }; /* + 1 for final zeroed struct */
/* the list only changes with the controller layouts: the input code asks for
it at every key check (about 100 times a frame), so it is built again only
when a layout changed */
static unsigned joy_map_types[MAX_PLAYER_COUNT];
static int joy_map_built;
const struct JoystickInfo *osd_get_joy_list(void)
{
unsigned needle = 0;
unsigned port_number = 0;
if(joy_map_built && memcmp(joy_map_types, options.active_control_type, sizeof(joy_map_types)) == 0)
return mame_joy_map;
memcpy(joy_map_types, options.active_control_type, sizeof(joy_map_types));
joy_map_built = 1;
for(port_number = 0; port_number < MAX_PLAYER_COUNT; port_number++)
{
int osd_code;