From 2420e46b449f4c8acdfe48c765ea52fc3e860de7 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Sun, 5 Jun 2016 19:14:33 -0300
Subject: vsync support

-works on windows
-may not work on X11, if so please fix
-OSX does not seem to support disabling vsync
---
 platform/windows/context_gl_win.cpp | 17 ++++++++++++++++-
 platform/windows/context_gl_win.h   |  8 ++++++++
 platform/windows/os_windows.cpp     | 15 +++++++++++++++
 platform/windows/os_windows.h       |  3 +++
 4 files changed, 42 insertions(+), 1 deletion(-)

(limited to 'platform/windows')

diff --git a/platform/windows/context_gl_win.cpp b/platform/windows/context_gl_win.cpp
index ab66b81421..fd9e895370 100644
--- a/platform/windows/context_gl_win.cpp
+++ b/platform/windows/context_gl_win.cpp
@@ -96,6 +96,20 @@ static GLWrapperFuncPtr wrapper_get_proc_address(const char* p_function) {
 }
 */
 
+void ContextGL_Win::set_use_vsync(bool p_use) {
+
+	if (wglSwapIntervalEXT) {
+		wglSwapIntervalEXT(p_use?1:0);
+	}
+	use_vsync=p_use;
+
+}
+
+bool ContextGL_Win::is_using_vsync() const {
+
+	return use_vsync;
+}
+
 
 Error ContextGL_Win::initialize() {
 
@@ -184,7 +198,7 @@ Error ContextGL_Win::initialize() {
 		printf("Activated GL 3.1 context");
 	}
 
-
+	wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)  wglGetProcAddress ("wglSwapIntervalEXT");
 //	glWrapperInit(wrapper_get_proc_address);
 
 	return OK;
@@ -194,6 +208,7 @@ ContextGL_Win::ContextGL_Win(HWND hwnd,bool p_opengl_3_context) {
 
 	opengl_3_context=p_opengl_3_context;
 	hWnd=hwnd;
+	use_vsync=false;
 }
 
 ContextGL_Win::~ContextGL_Win() {
diff --git a/platform/windows/context_gl_win.h b/platform/windows/context_gl_win.h
index 055e0b2f51..e1ab6fb26a 100644
--- a/platform/windows/context_gl_win.h
+++ b/platform/windows/context_gl_win.h
@@ -49,6 +49,8 @@
 
 #include <windows.h>
 
+typedef bool (APIENTRY *PFNWGLSWAPINTERVALEXTPROC) (int interval);
+
 class ContextGL_Win : public ContextGL {
 
 	HDC hDC;
@@ -56,6 +58,10 @@ class ContextGL_Win : public ContextGL {
 	unsigned int pixel_format;
 	HWND hWnd;
 	bool opengl_3_context;
+	bool use_vsync;
+
+
+	PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT;
 public:
 
 
@@ -69,6 +75,8 @@ public:
 
 	virtual Error initialize();
 
+	virtual void set_use_vsync(bool p_use);
+	virtual bool is_using_vsync() const;
 
 	ContextGL_Win(HWND hwnd,bool p_opengl_3_context);
 	~ContextGL_Win();
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 65ee39f4da..5e3dc438d0 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -2269,6 +2269,21 @@ String OS_Windows::get_joy_guid(int p_device) const {
 	return input->get_joy_guid_remapped(p_device);
 }
 
+void OS_Windows::set_use_vsync(bool p_enable) {
+
+	if (gl_context)
+		gl_context->set_use_vsync(p_enable);
+}
+
+bool OS_Windows::is_vsnc_enabled() const{
+
+	if (gl_context)
+		return gl_context->is_using_vsync();
+
+	return true;
+}
+
+
 OS_Windows::OS_Windows(HINSTANCE _hInstance) {
 
 	key_event_pos=0;
diff --git a/platform/windows/os_windows.h b/platform/windows/os_windows.h
index 6dd5b78bfd..509d76abbf 100644
--- a/platform/windows/os_windows.h
+++ b/platform/windows/os_windows.h
@@ -283,6 +283,9 @@ public:
 	virtual bool is_joy_known(int p_device);
 	virtual String get_joy_guid(int p_device) const;
 
+	virtual void set_use_vsync(bool p_enable);
+	virtual bool is_vsnc_enabled() const;
+
 	OS_Windows(HINSTANCE _hInstance);
 	~OS_Windows();
 
-- 
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