2 files changed, 20 insertions, 4 deletions
diff --git a/src/openglgraphics.cpp b/src/openglgraphics.cpp
index d8d7a807..48b10a1f 100644
--- a/src/openglgraphics.cpp
+++ b/src/openglgraphics.cpp
@@ -45,7 +45,8 @@
 #include "resources/image.h"
 
 OpenGLGraphics::OpenGLGraphics():
-    mAlpha(false), mTexture(false), mColorAlpha(false)
+    mAlpha(false), mTexture(false), mColorAlpha(false),
+    mSync(false)
 {
 }
 
@@ -53,6 +54,11 @@ OpenGLGraphics::~OpenGLGraphics()
 {
 }
 
+void OpenGLGraphics::setSync(bool sync)
+{
+    mSync = sync;
+}
+
 bool OpenGLGraphics::setVideoMode(int w, int h, int bpp, bool fs, bool hwaccel)
 {
     logger->log("Setting video mode %dx%d %s",
@@ -74,8 +80,10 @@ bool OpenGLGraphics::setVideoMode(int w, int h, int bpp, bool fs, bool hwaccel)
     }
 
 #ifdef __APPLE__
-//    long VBL = 1;
-//    CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &VBL);
+    if (mSync) {
+        const GLint VBL = 1;
+        CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &VBL);
+    }
 #endif
 
     // Setup OpenGL
@@ -352,7 +360,7 @@ void OpenGLGraphics::setTexturingAndBlending(bool enable)
 
 void OpenGLGraphics::drawRectangle(const gcn::Rectangle& rect, bool filled)
 {
-    float offset = filled ? 0 : 0.5f;
+    const float offset = filled ? 0 : 0.5f;
 
     setTexturingAndBlending(false);
 
diff --git a/src/openglgraphics.h b/src/openglgraphics.h
index 7d39e306..ea30e019 100644
--- a/src/openglgraphics.h
+++ b/src/openglgraphics.h
@@ -31,6 +31,13 @@ class OpenGLGraphics : public Graphics
 
         ~OpenGLGraphics();
 
+        /**
+         * Sets whether vertical refresh syncing is enabled. Takes effect after
+         * the next call to setVideoMode(). Only implemented on MacOS for now.
+         */
+        void setSync(bool sync);
+        bool getSync() const { return mSync; }
+
         bool setVideoMode(int w, int h, int bpp, bool fs, bool hwaccel);
 
         bool drawImage(Image *image,
@@ -72,6 +79,7 @@ class OpenGLGraphics : public Graphics
     private:
         bool mAlpha, mTexture;
         bool mColorAlpha;
+        bool mSync;
 };
 
 #endif