1 files changed, 73 insertions, 0 deletions
diff --git a/src/game/switchCallbacks.c b/src/game/switchCallbacks.c
new file mode 100644
index 0000000..235e40a
--- /dev/null
+++ b/src/game/switchCallbacks.c
@@ -0,0 +1,73 @@
+#include "base/switchCallbacks.h"
+#include <string.h>
+#include <stdlib.h>
+
+Callbacks *last_callback = NULL;
+Callbacks *current_callback = NULL;
+
+void exitCallback(Callbacks *cb) {
+  if(cb != NULL)
+    if(cb->exit != NULL)
+    (cb->exit)(); /* give them the chance to quit */
+}
+
+void initCallback(Callbacks *cb) {
+  if(cb->init != NULL)
+    (cb->init)();
+  if(cb->initGL != NULL)
+    (cb->initGL)();
+}
+
+
+void switchCallbacks(Callbacks *new) {
+	// if(current_callback)
+	// fprintf(stderr, "callbacks: exiting %s\n", current_callback->name);
+  exitCallback(current_callback);
+  SystemRegisterCallbacks(new);
+	// fprintf(stderr, "callbacks: initializing %s\n", new->name);
+  initCallback(new);
+
+  last_callback = current_callback;
+  current_callback = new;
+}
+  
+void updateCallbacks(void) {
+  /* called when the window is recreated */
+  exitCallback(current_callback);
+  SystemRegisterCallbacks(current_callback);
+  initCallback(current_callback);
+}
+
+void restoreCallbacks(void) {
+  if(last_callback == NULL) {
+    fprintf(stderr, "fatal: no last callback present, exiting\n");
+    exit(1); // OK: programmer error, critical
+  }
+
+  exitCallback(last_callback);
+  current_callback = last_callback;
+  SystemRegisterCallbacks(current_callback);
+  initCallback(current_callback);
+}
+
+#define N_CALLBACKS 7
+Callbacks *callbackList[N_CALLBACKS] = {
+	&gameCallbacks, &guiCallbacks, &pauseCallbacks, &configureCallbacks,
+	&promptCallbacks, &creditsCallbacks, &timedemoCallbacks
+};
+
+void setCallback(const char *name) {
+	int i;
+
+	for(i = 0; i < N_CALLBACKS; i++) {
+		if(strcmp( callbackList[i]->name, name ) == 0)
+			break;
+	}
+	if(i == N_CALLBACKS) {
+		fprintf(stderr, "fatal: no callback named '%s' found\n", name);
+		exit(1); // OK: programmer error, critical
+	}
+	switchCallbacks(callbackList[i]);
+}
+
+