From 01d4d52355894271acda20ae93a3324abaa9d848 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Wed, 6 Dec 2017 21:32:22 +1100
Subject: [PATCH] [client] removed useless delay functions

---
 client/Makefile |  1 -
 client/delay.c  | 70 -------------------------------------------------
 client/delay.h  | 22 ----------------
 client/main.c   |  3 ---
 4 files changed, 96 deletions(-)
 delete mode 100644 client/delay.c
 delete mode 100644 client/delay.h

diff --git a/client/Makefile b/client/Makefile
index c275e0a7..276b0a26 100644
--- a/client/Makefile
+++ b/client/Makefile
@@ -13,7 +13,6 @@ BUILD   ?= .build
 BIN     ?= bin
 
 OBJS	= main.o \
-	  delay.o \
 	  spice/spice.o \
 	  ivshmem/ivshmem.o \
 	  renderers/basic.o \
diff --git a/client/delay.c b/client/delay.c
deleted file mode 100644
index 9d2de265..00000000
--- a/client/delay.c
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
-Looking Glass - KVM FrameRelay (KVMFR) Client
-Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
-
-This program is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with
-this program; if not, write to the Free Software Foundation, Inc., 59 Temple
-Place, Suite 330, Boston, MA 02111-1307 USA
-*/
-
-#include "delay.h"
-
-#include <SDL2/SDL.h>
-
-#include "debug.h"
-
-static unsigned int delay_loop_count = 0;
-
-void delay()
-{
-  unsigned char j;
-  for(unsigned int i = 0; i < delay_loop_count; ++i)
-  {
-    j = 0;
-    while(--j)
-      asm("");
-  }
-}
-
-void delay_calibrate()
-{
-  // initialize the poll limit to a sane value
-  for(int start = SDL_GetTicks(); SDL_GetTicks() - start < 10; ++delay_loop_count) {}
-  DEBUG_INFO("Init : %u", delay_loop_count);
-
-  // the following loop must produce 20 concurrent valid results to ensure a valid calculation
-  int okCount = 0;
-  while(okCount < 20)
-  {
-    // time the final loop and calculate the remaining time
-    unsigned int ticks = SDL_GetTicks();
-    delay();
-    int remain = 10 - (SDL_GetTicks() - ticks);
-
-    // if the remaining time is within 2ms, accept it (Linux is not a RTOS)
-    if (remain > -2 && remain < 2)
-    {
-      ++okCount;
-      continue;
-    }
-
-    // the delay is out of spec, adjust the limit
-    okCount = 0;
-    DEBUG_INFO("Diff : %c%d ms", remain > 0 ? '-' : '+', abs(remain));
-    delay_loop_count += ceil(((double)delay_loop_count / 10.0) * remain);
-  }
-
-  DEBUG_INFO("Final: %u", delay_loop_count);
-
-  // scale the limit for a 1ms delay
-  delay_loop_count = ceil((double)delay_loop_count / 10.0);
-}
\ No newline at end of file
diff --git a/client/delay.h b/client/delay.h
deleted file mode 100644
index e365362c..00000000
--- a/client/delay.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
-Looking Glass - KVM FrameRelay (KVMFR) Client
-Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
-
-This program is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with
-this program; if not, write to the Free Software Foundation, Inc., 59 Temple
-Place, Suite 330, Boston, MA 02111-1307 USA
-*/
-
-#pragma once
-
-void delay_calibrate();
-void delay();
\ No newline at end of file
diff --git a/client/main.c b/client/main.c
index a2256fa0..6ea685ff 100644
--- a/client/main.c
+++ b/client/main.c
@@ -35,7 +35,6 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <GL/glu.h>
 
 #include "debug.h"
-#include "delay.h"
 #include "memcpySSE.h"
 #include "KVMFR.h"
 #include "ivshmem/ivshmem.h"
@@ -671,8 +670,6 @@ int run()
   state.scaleX  = 1.0f;
   state.scaleY  = 1.0f;
 
-  delay_calibrate();
-
   if (SDL_Init(SDL_INIT_VIDEO) < 0)
   {
     DEBUG_ERROR("SDL_Init Failed");