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Added support for vertical syncing via the Windows OS compositor (DWM.)

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This commit is contained in:
TerminalJack
2019-11-06 20:18:55 -06:00
committed by Rémi Verschelde
parent 10481046e5
commit e1dda5195c
11 changed files with 108 additions and 4 deletions
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41
platform/windows/context_gl_windows.cpp
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@@ -34,6 +34,8 @@
#include "context_gl_windows.h"
#include <dwmapi.h>
#define WGL_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define WGL_CONTEXT_MINOR_VERSION_ARB 0x2092
#define WGL_CONTEXT_FLAGS_ARB 0x2094
@@ -63,16 +65,52 @@ int ContextGL_Windows::get_window_height() {
return OS::get_singleton()->get_video_mode().height;
}
bool ContextGL_Windows::should_vsync_via_compositor() {
if (OS::get_singleton()->is_window_fullscreen() || !OS::get_singleton()->is_vsync_via_compositor_enabled()) {
return false;
}
// Note: All Windows versions supported by Godot have a compositor.
// It can be disabled on earlier Windows versions.
BOOL dwm_enabled;
if (SUCCEEDED(DwmIsCompositionEnabled(&dwm_enabled))) {
return dwm_enabled;
}
return false;
}
void ContextGL_Windows::swap_buffers() {
SwapBuffers(hDC);
if (use_vsync) {
bool vsync_via_compositor_now = should_vsync_via_compositor();
if (vsync_via_compositor_now) {
DwmFlush();
}
if (vsync_via_compositor_now != vsync_via_compositor) {
// The previous frame had a different operating mode than this
// frame. Set the 'vsync_via_compositor' member variable and the
// OpenGL swap interval to their proper values.
set_use_vsync(true);
}
}
}
void ContextGL_Windows::set_use_vsync(bool p_use) {
vsync_via_compositor = p_use && should_vsync_via_compositor();
if (wglSwapIntervalEXT) {
wglSwapIntervalEXT(p_use ? 1 : 0);
int swap_interval = (p_use && !vsync_via_compositor) ? 1 : 0;
wglSwapIntervalEXT(swap_interval);
}
use_vsync = p_use;
}
@@ -177,6 +215,7 @@ ContextGL_Windows::ContextGL_Windows(HWND hwnd, bool p_opengl_3_context) {
opengl_3_context = p_opengl_3_context;
hWnd = hwnd;
use_vsync = false;
vsync_via_compositor = false;
}
ContextGL_Windows::~ContextGL_Windows() {