From f8761dc0409000c6695467f72b32adf63e48361e Mon Sep 17 00:00:00 2001
From: Daniel Borca <dborca@users.sourceforge.net>
Date: Thu, 15 Jan 2004 08:30:05 +0000
Subject: [PATCH] implemented glutTimerFunc

---
 src/glut/dos/callback.c | 64 ++++++++++++++++++++++++++++++++++++++++-
 src/glut/dos/glutint.h  |  4 ++-
 2 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/src/glut/dos/callback.c b/src/glut/dos/callback.c
index 8ab75e794c5..174cbdda996 100644
--- a/src/glut/dos/callback.c
+++ b/src/glut/dos/callback.c
@@ -19,7 +19,7 @@
  */
 
 /*
- * DOS/DJGPP glut driver v1.3 for Mesa
+ * DOS/DJGPP glut driver v1.4 for Mesa
  *
  *  Copyright (C) 2002 - Borca Daniel
  *  Email : dborca@yahoo.com
@@ -31,10 +31,33 @@
 
 
 
+typedef struct {
+        void (*func) (int); /* function to call */
+        int value;          /* value to pass to callback */
+        int ttl;            /* time to live (blank shots) */
+        int fid;            /* func-id as returned from PCHW */
+} GLUTSShotCB;
+
+static GLboolean g_sscb_semaphore;
+
 GLUTidleCB g_idle_func = NULL;
 
 
 
+static void g_single_shot_callback (void *opaque)
+{
+ GLUTSShotCB *cb = (GLUTSShotCB *)opaque;
+ while (g_sscb_semaphore) {
+ }
+ if (!--cb->ttl) {
+    cb->func(cb->value);
+    pc_remove_int(cb->fid);
+    cb->func = NULL;
+ }
+} ENDOFUNC(g_single_shot_callback)
+
+
+
 void APIENTRY glutDisplayFunc (GLUTdisplayCB func)
 {
  g_curwin->display = func;
@@ -106,6 +129,45 @@ void APIENTRY glutIdleFunc (GLUTidleCB func)
 
 void APIENTRY glutTimerFunc (unsigned int millis, GLUTtimerCB func, int value)
 {
+ static GLUTSShotCB g_sscb[MAX_SSHOT_CB];
+ static int virgin = GL_TRUE;
+
+ int i;
+ int ttl;
+ unsigned int freq;
+
+ if (virgin) {
+    virgin = GL_FALSE;
+    LOCKDATA(g_sscb);
+    LOCKDATA(g_sscb_semaphore);
+    LOCKFUNC(g_single_shot_callback);
+    /* we should lock the callee also... */
+ }
+
+ if (millis > 0) {
+    if (millis > 50) {
+       /* don't go beyond 20Hz */
+       freq = 200;
+       ttl = millis * freq / 1000;
+    } else {
+       freq = 1000 / millis;
+       ttl = 1;
+    }
+    g_sscb_semaphore++;
+    for (i = 0; i < MAX_SSHOT_CB; i++) {
+        if (g_sscb[i].func == NULL) {
+           int fid = pc_install_int((PFUNC)func, &g_sscb[i], freq);
+           if (fid >= 0) {
+              g_sscb[i].func = func;
+              g_sscb[i].value = value;
+              g_sscb[i].ttl = ttl;
+              g_sscb[i].fid = fid;
+           }
+           break;
+        }
+    }
+    g_sscb_semaphore--;
+ }
 }
 
 
diff --git a/src/glut/dos/glutint.h b/src/glut/dos/glutint.h
index 23ab169d399..2cd0dde1b87 100644
--- a/src/glut/dos/glutint.h
+++ b/src/glut/dos/glutint.h
@@ -19,7 +19,7 @@
  */
 
 /*
- * DOS/DJGPP glut driver v1.4 for Mesa
+ * DOS/DJGPP glut driver v1.5 for Mesa
  *
  *  Copyright (C) 2002 - Borca Daniel
  *  Email : dborca@users.sourceforge.net
@@ -146,6 +146,8 @@ extern void *__glutFont(void *font);
 
 #define MAX_WINDOWS 2
 
+#define MAX_SSHOT_CB 10
+
 #define RESERVED_COLORS 0
 
 #endif /* __glutint_h__ */
-- 
2.30.2