101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
#include <mouse.h>
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#include <SDL.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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static void mouse_click(const SDL_MouseButtonEvent *const ev,
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struct mouse *const m)
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{
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int mask;
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if (!m->first_clicked)
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{
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srand(time(NULL));
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m->first_clicked = true;
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}
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switch (ev->button)
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{
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case 1:
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mask = 1 << MOUSE_BUTTON_LEFT;
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break;
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case 3:
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mask = 1 << MOUSE_BUTTON_RIGHT;
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break;
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default:
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return;
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}
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if (ev->state == SDL_PRESSED)
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m->mask |= mask;
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else
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m->mask &= ~mask;
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}
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static void mouse_event(const SDL_MouseMotionEvent *const ev,
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struct mouse *const m)
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{
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m->x = ev->x;
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m->y = ev->y;
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}
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void mouse_update(struct mouse *const m)
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{
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const short x = m->x, y = m->y;
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SDL_Event ev;
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int n;
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m->oldmask = m->mask;
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while ((n = SDL_PeepEvents(&ev, 1, SDL_GETEVENT, SDL_MOUSEMOTIONMASK
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| SDL_MOUSEBUTTONDOWNMASK | SDL_MOUSEBUTTONUPMASK)) > 0)
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{
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switch (ev.type)
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{
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case SDL_MOUSEBUTTONDOWN:
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/* Fall through. */
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case SDL_MOUSEBUTTONUP:
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mouse_click(&ev.button, m);
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/* SDL_PeepEvents might return both pressed and released
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* button events on the same cycle, but this library only
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* expects one event at a time.
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* Contrarily, all available SDL_MOUSEMOTION events must
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* be treated simultaneously to avoid latency. */
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goto end;
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case SDL_MOUSEMOTION:
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mouse_event(&ev.motion, m);
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break;
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default:
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fprintf(stderr, "%s: unexpected SDL_Event %d\n",
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__func__, ev.type);
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break;
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}
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}
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m->dx = m->x - x;
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m->dy = m->y - y;
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end:
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if (n < 0)
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{
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fprintf(stderr, "%s: SDL_PeepEvents: %s\n",
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__func__, SDL_GetError());
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return;
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}
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}
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bool mouse_available(void)
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{
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/* Mouse availability is always assumed in SDL. */
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return true;
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}
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