config: Add a setting for graphics V-Sync.

src/citra/config.cpp

@@ -71,6 +71,7 @@ void Config::ReadValues() {
     Settings::values.use_hw_renderer = sdl2_config->GetBoolean("Renderer", "use_hw_renderer", true);
     Settings::values.use_shader_jit = sdl2_config->GetBoolean("Renderer", "use_shader_jit", true);
     Settings::values.use_scaled_resolution = sdl2_config->GetBoolean("Renderer", "use_scaled_resolution", false);
+    Settings::values.use_vsync = sdl2_config->GetBoolean("Renderer", "use_vsync", false);
 
     Settings::values.bg_red   = (float)sdl2_config->GetReal("Renderer", "bg_red",   1.0);
     Settings::values.bg_green = (float)sdl2_config->GetReal("Renderer", "bg_green", 1.0);

src/citra/default_ini.h

@@ -55,6 +55,10 @@ use_shader_jit =
 # 0 (default): Native, 1: Scaled
 use_scaled_resolution =
 
+# Whether to enable V-Sync (caps the framerate at 60FPS) or not.
+# 0 (default): Off, 1: On
+use_vsync =
+
 # The clear color for the renderer. What shows up on the sides of the bottom screen.
 # Must be in range of 0.0-1.0. Defaults to 1.0 for all.
 bg_red =

src/citra/emu_window/emu_window_sdl2.cpp

@@ -108,6 +108,7 @@ EmuWindow_SDL2::EmuWindow_SDL2() {
     OnResize();
     OnMinimalClientAreaChangeRequest(GetActiveConfig().min_client_area_size);
     SDL_PumpEvents();
+    SDL_GL_SetSwapInterval(Settings::values.use_vsync);
 
     DoneCurrent();
 }