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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#if defined HEADLESS
#include "lib/headlessStubs/wglstub.h"
#include "lib/headlessStubs/glxextstub.h"
#elif defined WIN32
#include "System/Platform/Win/win32.h"
#include <wingdi.h>
#else
#include <GL/glxew.h> // for glXGetVideoSyncSGI() glXWaitVideoSyncSGI()
#endif
#include "System/mmgr.h"
#include "VerticalSync.h"
#include "GL/myGL.h"
#include "System/Config/ConfigHandler.h"
CONFIG(int, VSync).defaultValue(-1);
CVerticalSync VSync;
/******************************************************************************/
CVerticalSync::CVerticalSync()
{
frames = -1;
}
CVerticalSync::~CVerticalSync()
{
}
/******************************************************************************/
void CVerticalSync::Init()
{
SetFrames(configHandler->GetInt("VSync"));
}
void CVerticalSync::SetFrames(int f)
{
configHandler->Set("VSync", f);
frames = f;
#if !defined(WIN32) && !defined(__APPLE__)
if (frames > 0)
if (!GLXEW_SGI_video_sync)
frames = 0; // disable
#endif
#ifdef WIN32
// VSync enabled is the default for OpenGL drivers
if (frames < 0) {
return;
}
// WGL_EXT_swap_control is the only WGL extension
// exposed in glGetString(GL_EXTENSIONS)
if (strstr((const char*)glGetString(GL_EXTENSIONS), "WGL_EXT_swap_control")) {
typedef BOOL (WINAPI * PFNWGLSWAPINTERVALEXTPROC) (int interval);
PFNWGLSWAPINTERVALEXTPROC SwapIntervalProc =
(PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
if (SwapIntervalProc) {
SwapIntervalProc(frames);
}
}
#endif
}
/******************************************************************************/
void CVerticalSync::Delay() const
{
#if !defined(WIN32) && !defined(__APPLE__)
if (frames > 0) {
GLuint frameCount;
if (glXGetVideoSyncSGI(&frameCount) == 0)
glXWaitVideoSyncSGI(frames, (frameCount+1) % frames, &frameCount);
}
#endif
}
/******************************************************************************/
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