Port of "grävning" to C/SDL, started 2003-03-22

1 files changed, 75 insertions, 0 deletions

diff --git a/keyboard.c b/keyboard.c
new file mode 100644
index 0000000..06d57b9
--- /dev/null
+++ b/keyboard.c
@@ -0,0 +1,75 @@
+/*
+ * keyboard.c
+ *
+ * Basic keyboard handing functions -- allows event-handling loops
+ * to push keyboard events onto a queue so they can be processed at
+ * the appropriate time in the game rounds loop
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <math.h>
+#include "graphics.h"
+#include "grv.h"
+
+#define KEYQUEUELEN	16
+
+static SDL_KeyboardEvent keyqueue[KEYQUEUELEN];
+static SDL_KeyboardEvent *kqh = keyqueue;
+static SDL_KeyboardEvent *kqt = keyqueue;
+static int queuedkeys = 0;
+
+/*
+ * Push a keyboard event onto the queue; use this in event loops
+ */
+void push_key(SDL_KeyboardEvent *ke)
+{
+  if ( queuedkeys >= KEYQUEUELEN )
+    return;			/* Drop it */
+
+  queuedkeys++;
+  *kqh++ = *ke;
+  if ( kqh >= &keyqueue[KEYQUEUELEN] )
+    kqh = keyqueue;
+}
+
+/*
+ * Poll the keyboard queue for a key event
+ */
+SDL_KeyboardEvent *poll_key(void)
+{
+  SDL_KeyboardEvent *ke;
+
+  if ( queuedkeys ) {
+    queuedkeys--;
+    ke = kqt++;
+    if ( kqt >= &keyqueue[KEYQUEUELEN] )
+      kqt = keyqueue;
+    return ke;
+  } else {
+  return NULL;
+}
+}
+
+/*
+ * Get a key, pausing if necessary
+ */
+SDL_KeyboardEvent *get_key(void)
+{
+  static SDL_Event event;
+  SDL_KeyboardEvent *ke;
+
+  if ( (ke = poll_key()) )
+    return ke;
+
+  while ( SDL_WaitEvent(&event) ) {
+    if ( event.type == SDL_KEYDOWN )
+      return &event.key;
+    else if ( event.type == SDL_USEREVENT && event.user.code == event_blink )
+      update_blink();
+  }
+  return NULL;
+}
+