VSync on/off switch

nzeemin · Jul 18, 2024 · e7646ef · e7646ef
1 parent 0666b42
commit e7646ef
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Showing 4 changed files with 43 additions and 0 deletions.
diff --git a/emulator/Main.h b/emulator/Main.h
@@ -26,6 +26,8 @@ extern double g_dFramesPercent;
 
 extern bool g_okDebugCpuPpu;
 
+extern bool g_okVsyncSwitchable;
+
 extern uint32_t* m_bits;  // Screen buffer
 extern ImTextureID g_ScreenTextureID;
 
@@ -79,6 +81,8 @@ void Settings_SetHardFilePath(int slot, LPCTSTR sFilePath);
 void Settings_GetHardFilePath(int slot, LPTSTR buffer);
 void Settings_SetScreenViewMode(int mode);
 int  Settings_GetScreenViewMode();
+BOOL Settings_GetScreenVsync();
+void Settings_SetScreenVsync(BOOL flag);
 void Settings_SetScreenshotMode(int mode);
 int  Settings_GetScreenshotMode();
 BOOL Settings_GetDebugCpuPpu();
@@ -150,6 +154,8 @@ void Settings_SetColor(ColorIndices colorIndex, COLORREF color);
 //extern bool Option_ShowHelp;
 extern int Option_AutoBoot;
 
+extern void SetVSync();
+
 
 //////////////////////////////////////////////////////////////////////
 // Widgets

diff --git a/emulator/MainWindow.cpp b/emulator/MainWindow.cpp
@@ -420,6 +420,16 @@ void ControlView_ImGuiWidget()
 
     ImGui::SeparatorText("ImGui");
     ImGui::TextDisabled("FPS: %.1f", ImGui::GetIO().Framerate);
+    if (g_okVsyncSwitchable)
+    {
+        bool vsync = Settings_GetScreenVsync();
+        if (ImGui::Checkbox("VSync", &vsync))
+        {
+            Settings_SetScreenVsync(vsync);
+            SetVSync();
+        }
+    }
+
 #ifdef _DEBUG
     ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
 #endif

diff --git a/emulator/Settings.cpp b/emulator/Settings.cpp
@@ -325,6 +325,8 @@ void Settings_SetCartridgeFilePath(int slot, LPCTSTR sFilePath)
 
 SETTINGS_GETSET_DWORD(ScreenViewMode, _T("ScreenViewMode"), int, 1);
 
+SETTINGS_GETSET_DWORD(ScreenVsync, _T("ScreenVsync"), BOOL, FALSE);
+
 SETTINGS_GETSET_DWORD(ScreenHeightMode, _T("ScreenHeightMode"), int, 0);
 
 SETTINGS_GETSET_DWORD(ScreenshotMode, _T("ScreenshotMode"), int, 1);

diff --git a/emulator/main.cpp b/emulator/main.cpp
@@ -36,6 +36,8 @@ double g_dFramesPercent = 0.0;
 
 bool g_okDebugCpuPpu = false;
 
+bool g_okVsyncSwitchable = false;
+
 
 //////////////////////////////////////////////////////////////////////
 
@@ -157,6 +159,27 @@ bool IsFileExist(const char * fileName)
     return errno != ENOENT;
 }
 
+void SetVSync()
+{
+    bool sync = Settings_GetScreenVsync();
+
+    typedef BOOL(APIENTRY* PFNWGLSWAPINTERVALPROC)(int);
+    PFNWGLSWAPINTERVALPROC wglSwapIntervalEXT = nullptr;
+
+    const char* extensions = (char*)glGetString(GL_EXTENSIONS);
+
+    wglSwapIntervalEXT = (PFNWGLSWAPINTERVALPROC)wglGetProcAddress("wglSwapIntervalEXT");
+
+    if (wglSwapIntervalEXT == nullptr)
+    {
+        g_okVsyncSwitchable = false;
+        return;
+    }
+
+    wglSwapIntervalEXT(sync);
+    g_okVsyncSwitchable = true;
+}
+
 // Main code
 #ifdef _WIN32
 int WinMain(HINSTANCE hInstance, HINSTANCE /*hPrevInstance*/, LPSTR /*lpCmdLine*/, int /*nShowCmd*/)
@@ -254,6 +277,8 @@ int main(int, char**)
 
     g_ScreenTextureID = (void*)(intptr_t) screen_texture;
 
+    SetVSync();  // Set initial Vsync flag value
+
     // Win32+GL needs specific hooks for viewport, as there are specific things needed to tie Win32 and GL api.
     if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
     {