Ticket #523: SDLGLSWAPCONTROLWIN.patch

wsdl.cpp

@@ -261 +261 @@
 
 static int depth_bits = 24; // depth buffer size; set via SDL_GL_SetAttribute
 
+typedef BOOL (APIENTRY *PFNWGLEXTSWAPCONTROLPROC)( int );
+static int vSyncValue = 1;
+
 // check if resolution needs to be changed
 static bool video_NeedsChange(int w, int h, int cur_w, int cur_h, bool fullscreen)
 {
@@ -279 +282 @@
     return false;
 }
 
+void SetVSyncValue() {
 
+  char* e = (char*)glGetString(GL_EXTENSIONS);
+
+  if(!e)
+    return;
+
+  if (!strstr(e, "WGL_EXT_swap_control"))
+    return;
+ 
+  PFNWGLEXTSWAPCONTROLPROC wglSwapEXT = (PFNWGLEXTSWAPCONTROLPROC) wglGetProcAddress("wglSwapIntervalEXT");
+
+  if (!wglSwapEXT)
+    return;
+
+  wglSwapEXT(vSyncValue);
+}
+
+
 int SDL_GL_SetAttribute(SDL_GLattr attr, int value)
 {
     if(attr == SDL_GL_DEPTH_SIZE)
         depth_bits = value;
 
+  if (attr == SDL_GL_SWAP_CONTROL) {
+    vSyncValue = value;
+  }
+
     return 0;
 }
 
@@ -373 +398 @@
 
         if(!wglMakeCurrent(g_hDC, hGLRC))
             return 0;
+
+    // We should not have to call this here but since our code is not really friendly
+    // this will have to do!.
+    SetVSyncValue();
     }
     else    // update the existing window
     {