From 213ca43656411a06bbf1c0d18e4ebacaf545eb34 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 3 Oct 2016 00:10:01 +0300
Subject: [PATCH] Add support for swap interval control

---
 source/graphics/cgl/glcontext.cpp         |  5 +++++
 source/graphics/egl_android/glcontext.cpp |  5 +++++
 source/graphics/glcontext.cpp             |  3 +++
 source/graphics/glcontext.h               |  2 ++
 source/graphics/glx/glcontext.cpp         |  9 +++++++++
 source/graphics/wgl/glcontext.cpp         | 11 +++++++++++
 6 files changed, 35 insertions(+)

diff --git a/source/graphics/cgl/glcontext.cpp b/source/graphics/cgl/glcontext.cpp
index 4d51052..02c4d44 100644
--- a/source/graphics/cgl/glcontext.cpp
+++ b/source/graphics/cgl/glcontext.cpp
@@ -67,6 +67,11 @@ GLContext::~GLContext()
 	delete priv;
 }
 
+void GLContext::set_swap_interval(unsigned)
+{
+	// TODO
+}
+
 void GLContext::swap_buffers()
 {
 	flush_gl_buffer(priv->context);
diff --git a/source/graphics/egl_android/glcontext.cpp b/source/graphics/egl_android/glcontext.cpp
index 0e98739..7853b21 100644
--- a/source/graphics/egl_android/glcontext.cpp
+++ b/source/graphics/egl_android/glcontext.cpp
@@ -109,6 +109,11 @@ GLContext::~GLContext()
 	delete priv;
 }
 
+void GLContext::set_swap_interval(unsigned)
+{
+	// TODO
+}
+
 void GLContext::swap_buffers()
 {
 	eglSwapBuffers(priv->display, priv->surface);
diff --git a/source/graphics/glcontext.cpp b/source/graphics/glcontext.cpp
index ab0ea7a..47e1e59 100644
--- a/source/graphics/glcontext.cpp
+++ b/source/graphics/glcontext.cpp
@@ -41,6 +41,9 @@ void GLContext::platform_init(const GLOptions &)
 GLContext::~GLContext()
 { }
 
+void GLContext::set_swap_interval(unsigned)
+{ }
+
 void GLContext::swap_buffers()
 { }
 
diff --git a/source/graphics/glcontext.h b/source/graphics/glcontext.h
index a248090..8cf75c8 100644
--- a/source/graphics/glcontext.h
+++ b/source/graphics/glcontext.h
@@ -44,6 +44,8 @@ private:
 public:
 	~GLContext();
 
+	void set_swap_interval(unsigned);
+
 	void swap_buffers();
 private:
 	void window_resized(unsigned, unsigned);
diff --git a/source/graphics/glx/glcontext.cpp b/source/graphics/glx/glcontext.cpp
index e4662f3..46da6d1 100644
--- a/source/graphics/glx/glcontext.cpp
+++ b/source/graphics/glx/glcontext.cpp
@@ -84,6 +84,15 @@ GLContext::~GLContext()
 	delete priv;
 }
 
+void GLContext::set_swap_interval(unsigned i)
+{
+	const GLubyte *name = reinterpret_cast<const GLubyte *>("glXSwapIntervalEXT");
+	PFNGLXSWAPINTERVALEXTPROC func = reinterpret_cast<PFNGLXSWAPINTERVALEXTPROC>(glXGetProcAddress(name));
+	if(!func)
+		throw runtime_error("glXSwapIntervalEXT not found");
+	func(display.get_private().display, priv->subwnd, i);
+}
+
 void GLContext::swap_buffers()
 {
 	glXSwapBuffers(display.get_private().display, priv->subwnd);
diff --git a/source/graphics/wgl/glcontext.cpp b/source/graphics/wgl/glcontext.cpp
index 844f7a7..3df83f3 100644
--- a/source/graphics/wgl/glcontext.cpp
+++ b/source/graphics/wgl/glcontext.cpp
@@ -1,8 +1,11 @@
 #include <windows.h>
 #include <GL/gl.h>
+#include <GL/wglext.h>
 #include "glcontext.h"
 #include "window_private.h"
 
+using namespace std;
+
 namespace Msp {
 namespace Graphics {
 
@@ -53,6 +56,14 @@ GLContext::~GLContext()
 	delete priv;
 }
 
+void GLContext::set_swap_interval(unsigned i)
+{
+	PFNWGLSWAPINTERVALEXTPROC func = reinterpret_cast<PFNWGLSWAPINTERVALEXTPROC>(wglGetProcAddress("wglSwapIntervalEXT"));
+	if(!func)
+		throw runtime_error("wglSwapIntervalEXT not found");
+	func(i);
+}
+
 void GLContext::swap_buffers()
 {
 	HDC dc = GetDC(window.get_private().window);
-- 
2.43.0