From f406e0695cdcf2f766588b635e1d6ba2b99971b9 Mon Sep 17 00:00:00 2001
From: ketmar <ketmar@ketmar.no-ip.org>
Date: Wed, 24 Aug 2016 04:52:59 +0000
Subject: [PATCH] redraw each frame, or driver (system?) will decrease our
 priority, and we won't get our desired framerate

FossilOrigin-Name: 0c20bea0df10ed1bc2a123cd60e53ca534783d6077a39abbd2f54e2b53723e53
---
 xreader.d | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/xreader.d b/xreader.d
index 05fedd0..c5eb21d 100644
--- a/xreader.d
+++ b/xreader.d
@@ -78,6 +78,7 @@ void run (string bookFileName) {
   auto stt = MonoTime.currTime;
   auto prevt = MonoTime.currTime;
   auto curt = prevt;
+  auto lastRedrawTime = curt;
   LayText laytext;
   int textHeight = GHeight-8;
   bool doSaveCheck = false;
@@ -862,6 +863,7 @@ void run (string bookFileName) {
       //vg.endFrame();
     }
     vg.endFrame();
+    lastRedrawTime = MonoTime.currTime;
   };
 
   void processThreads () {
@@ -883,10 +885,11 @@ void run (string bookFileName) {
   }
 
   auto lastTimerEventTime = MonoTime.currTime;
+  bool somethingVisible = true;
 
   sdwindow.visibilityChanged = delegate (bool vis) {
-    //import core.stdc.stdio;
-    //printf("VISCHANGED: %s\n", (vis ? "tan" : "ona").ptr);
+    //import core.stdc.stdio; printf("VISCHANGED: %s\n", (vis ? "tan" : "ona").ptr);
+    somethingVisible = vis;
   };
 
   sdwindow.eventLoop(1000/34,
@@ -897,11 +900,9 @@ void run (string bookFileName) {
       auto ctt = MonoTime.currTime;
 
       {
-        auto spass = (lastTimerEventTime-ctt).total!"msecs";
-        if (spass > 33) {
-          import core.stdc.stdio;
-          printf("WARNING: too long frame time: %u\n", cast(uint)spass);
-        }
+        auto spass = (ctt-lastTimerEventTime).total!"msecs";
+        //if (spass >= 30) { import core.stdc.stdio; printf("WARNING: too long frame time: %u\n", cast(uint)spass); }
+        //{ import core.stdc.stdio; printf("FRAME TIME: %u\n", cast(uint)spass); }
         lastTimerEventTime = ctt;
         // update FPS timer
         prevt = curt;
@@ -965,7 +966,12 @@ void run (string bookFileName) {
           refresh();
         }
       }
-      if (needRedraw) sdwindow.redrawOpenGlSceneNow();
+      if (somethingVisible) {
+        // sadly, to keep framerate we have to redraw each frame, or driver will throw us out of the ship
+        if (/*needRedraw*/true) sdwindow.redrawOpenGlSceneNow();
+      } else {
+        refresh();
+      }
       doSaveState();
       // load new book?
       if (newBookFileName.length && formatWorks == 0) {
-- 
2.11.4.GIT