ref: fd7bb985bc4b66a0699b034a96affab88b05aff6
dir: /input.c/
#include <SDL2/SDL_events.h>
#include <SDL2/SDL_joystick.h>
#include <SDL2/SDL_keycode.h>
#include <SDL2/SDL_scancode.h>
#include <stdio.h>
#include "input.h"
#include "render.h"
SDL_Joystick *js;
enum keycodes {
key_left = 1 << 7,
key_up = 1 << 6,
key_down = 1 << 5,
key_select = 1 << 4,
key_start = 1 << 3,
key_right = 1 << 2,
key_opt = 1 << 1,
key_edit = 1
};
int initialize_input() {
int num_joysticks = SDL_NumJoysticks();
if (num_joysticks > 0) {
js = SDL_JoystickOpen(0);
SDL_JoystickEventState(SDL_ENABLE);
fprintf(stderr, "Opened Joystick 0");
}
return num_joysticks;
}
void close_input() { SDL_JoystickClose(js); }
uint8_t process_input() {
SDL_Event event;
uint8_t key = 0;
static uint8_t input = 0;
SDL_PollEvent(&event);
switch (event.type) {
case SDL_QUIT:
return 21;
case SDL_JOYAXISMOTION:
switch (event.jaxis.axis) {
case 0:
if (event.jaxis.value < 0) {
input |= key_left;
break;
}
if (event.jaxis.value > 0) {
input |= key_right;
break;
}
if (event.jaxis.value == 0) {
input &= ~key_left;
input &= ~key_right;
break;
}
case 1:
if (event.jaxis.value < 0) {
input |= key_up;
break;
}
if (event.jaxis.value > 0) {
input |= key_down;
break;
}
if (event.jaxis.value == 0) {
input &= ~key_up;
input &= ~key_down;
break;
}
}
break;
case SDL_JOYBUTTONDOWN:
case SDL_JOYBUTTONUP:
switch (event.jbutton.button) {
case 1:
key = key_edit;
break;
case 2:
key = key_opt;
break;
case 8:
key = key_select;
break;
case 9:
key = key_start;
break;
}
if (event.type == SDL_JOYBUTTONDOWN)
input |= key;
else
input &= ~key;
return input;
break;
case SDL_KEYDOWN:
// ALT+ENTER toggles fullscreen
if (event.key.keysym.sym == SDLK_RETURN &&
(event.key.keysym.mod & KMOD_ALT) > 0) {
toggle_fullscreen();
}
// CTRL+q quits program
if (event.key.keysym.sym == SDLK_q &&
(event.key.keysym.mod & KMOD_CTRL) > 0) {
return 21; // arbitary quit code for main loop
}
case SDL_KEYUP:
switch (event.key.keysym.scancode) {
case SDL_SCANCODE_I:
case SDL_SCANCODE_UP:
key = key_up;
break;
case SDL_SCANCODE_J:
case SDL_SCANCODE_LEFT:
key = key_left;
break;
case SDL_SCANCODE_K:
case SDL_SCANCODE_DOWN:
key = key_down;
break;
case SDL_SCANCODE_L:
case SDL_SCANCODE_RIGHT:
key = key_right;
break;
case SDL_SCANCODE_A:
key = key_select;
break;
case SDL_SCANCODE_S:
key = key_start;
break;
case SDL_SCANCODE_Z:
key = key_opt;
break;
case SDL_SCANCODE_X:
key = key_edit;
break;
default:
key = 0;
break;
}
break;
default:
break;
}
if (event.type == SDL_KEYDOWN)
input |= key;
else
input &= ~key;
return input;
}