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https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-30 08:00:51 +00:00
[qwaq] Create some ring-buffer macros
I expect I will need several messaging buffers, and ring buffers tend to be quite robust. Replacing the event buffer code with the macros made testing easy.
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parent
6a58dcdddd
commit
644ef93dde
2 changed files with 62 additions and 11 deletions
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@ -28,7 +28,7 @@ int main (int argc, string *argv)
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ch = event.e.key;
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mvwprintf (win, 1, 1, "key: %d\n", ch);
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} else if (event.event_type == qe_mouse) {
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mvwprintf (win, 1, 2, "mouse: %d %d %d\n",
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mvwprintf (win, 1, 2, "mouse: %2d %2d %08x\n",
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event.e.mouse.x,
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event.e.mouse.y,
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event.e.mouse.buttons);
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@ -48,6 +48,61 @@
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#define QUEUE_MASK (QUEUE_SIZE - 1)
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#define MOUSE_MOVES "\033[?1003h" // Make the terminal report mouse movements
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#define RING_BUFFER(type, size) \
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struct { \
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type buffer[size]; \
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unsigned head; \
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unsigned tail; \
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}
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#define RB_buffer_size(ring_buffer) \
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({ __auto_type rb = (ring_buffer); \
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sizeof (rb->buffer) / sizeof (rb->buffer[0]); \
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})
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#define RB_SPACE_AVAILABLE(ring_buffer) \
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({ __auto_type rb = &(ring_buffer); \
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(rb->tail + RB_buffer_size(rb) - rb->head - 1) % RB_buffer_size(rb);\
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})
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#define RB_DATA_AVAILABLE(ring_buffer) \
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({ __auto_type rb = &(ring_buffer); \
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(rb->head + RB_buffer_size (rb) - rb->tail) % RB_buffer_size (rb); \
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})
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#define RB_WRITE_DATA(ring_buffer, data, count) \
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({ __auto_type rb = &(ring_buffer); \
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typeof (&rb->buffer[0]) d = (data); \
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unsigned c = (count); \
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unsigned h = rb->head; \
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rb->head = (h + c) % RB_buffer_size (rb); \
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if (c > RB_buffer_size (rb) - h) { \
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memcpy (rb->buffer + h, d, \
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(RB_buffer_size (rb) - h) * sizeof (rb->buffer[0])); \
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c -= RB_buffer_size (rb) - h; \
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d += RB_buffer_size (rb) - h; \
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h = 0; \
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} \
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memcpy (rb->buffer + h, d, c * sizeof (rb->buffer[0])); \
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})
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#define RB_READ_DATA(ring_buffer, data, count) \
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({ __auto_type rb = &(ring_buffer); \
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typeof (&rb->buffer[0]) d = (data); \
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unsigned c = (count); \
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unsigned oc = c; \
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unsigned t = rb->tail; \
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if (c > RB_buffer_size (rb) - t) { \
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memcpy (d, rb->buffer + t, \
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(RB_buffer_size (rb) - t) * sizeof (rb->buffer[0])); \
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c -= RB_buffer_size (rb) - t; \
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d += RB_buffer_size (rb) - t; \
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t = 0; \
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} \
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memcpy (d, rb->buffer + t, c * sizeof (rb->buffer[0])); \
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rb->tail = (t + oc) % RB_buffer_size (rb); \
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})
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typedef struct window_s {
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WINDOW *win;
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} window_t;
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@ -57,9 +112,7 @@ typedef struct qwaq_resources_s {
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int initialized;
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dstring_t *print_buffer;
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PR_RESMAP (window_t) window_map;
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qwaq_event_t event_queue[QUEUE_SIZE];
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unsigned queue_head;
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unsigned queue_tail;
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RING_BUFFER (qwaq_event_t, QUEUE_SIZE) event_queue;
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} qwaq_resources_t;
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static window_t *
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@ -92,7 +145,7 @@ window_index (qwaq_resources_t *res, window_t *win)
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PR_RESINDEX (res->window_map, win);
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}
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static always_inline window_t *
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static always_inline window_t * __attribute__((pure))
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get_window (qwaq_resources_t *res, const char *name, int handle)
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{
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window_t *window = window_get (res, handle);
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@ -198,19 +251,17 @@ bi_wgetch (progs_t *pr)
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static void
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add_event (qwaq_resources_t *res, qwaq_event_t *event)
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{
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if (((res->queue_head - res->queue_tail) & QUEUE_MASK) != QUEUE_MASK) {
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res->event_queue[res->queue_head] = *event;
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res->queue_head = (res->queue_head + 1) & QUEUE_MASK;
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if (RB_SPACE_AVAILABLE (res->event_queue) >= 1) {
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RB_WRITE_DATA (res->event_queue, event, 1);
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}
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}
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static int
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get_event (qwaq_resources_t *res, qwaq_event_t *event)
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{
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if (res->queue_head != res->queue_tail) {
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if (RB_DATA_AVAILABLE (res->event_queue) >= 1) {
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if (event) {
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*event = res->event_queue[res->queue_tail];
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res->queue_tail = (res->queue_tail + 1) & QUEUE_MASK;
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RB_READ_DATA (res->event_queue, event, 1);
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}
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return 1;
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}
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