From 664b49726136f861d695b96f4e285f9afcdc7127 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Thu, 27 Jun 2019 22:07:36 +0200
Subject: Add puglGetTime()

---
 pugl/pugl.h       | 10 ++++++++++
 pugl/pugl_osx.m   |  9 +++++++++
 pugl/pugl_win.cpp | 13 +++++++++++++
 pugl/pugl_x11.c   | 10 ++++++++++
 4 files changed, 42 insertions(+)

diff --git a/pugl/pugl.h b/pugl/pugl.h
index 01b7f01..c8e62d4 100644
--- a/pugl/pugl.h
+++ b/pugl/pugl.h
@@ -634,6 +634,16 @@ typedef void (*PuglGlFunc)(void);
 PUGL_API PuglGlFunc
 puglGetProcAddress(const char* name);
 
+/**
+   Return the time in seconds.
+
+   This is a monotonically increasing clock with high resolution.  The returned
+   time is only useful to compare against other times returned by this
+   function, its absolute value has no meaning.
+*/
+PUGL_API double
+puglGetTime(PuglView* view);
+
 /**
    Request a redisplay on the next call to puglProcessEvents().
 */
diff --git a/pugl/pugl_osx.m b/pugl/pugl_osx.m
index 02bf46a..1503034 100644
--- a/pugl/pugl_osx.m
+++ b/pugl/pugl_osx.m
@@ -27,6 +27,7 @@
 #import <Cocoa/Cocoa.h>
 
 #include <stdlib.h>
+#include <time.h>
 
 #undef PUGL_HAVE_CAIRO
 
@@ -726,6 +727,14 @@ puglGetProcAddress(const char *name)
 	return func;
 }
 
+double
+puglGetTime(PuglView* view)
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return (double)ts.tv_sec + ts.tv_nsec / 1000000000.0;
+}
+
 void
 puglPostRedisplay(PuglView* view)
 {
diff --git a/pugl/pugl_win.cpp b/pugl/pugl_win.cpp
index 6185c91..2ae832b 100644
--- a/pugl/pugl_win.cpp
+++ b/pugl/pugl_win.cpp
@@ -55,6 +55,7 @@ struct PuglInternalsImpl {
 	HDC      hdc;
 	HGLRC    hglrc;
 	WNDCLASS wc;
+	double   timerFrequency;
 };
 
 LRESULT CALLBACK
@@ -99,6 +100,10 @@ puglCreateWindow(PuglView* view, const char* title)
 
 	PuglInternals* impl = view->impl;
 
+	LARGE_INTEGER frequency;
+	QueryPerformanceFrequency(&frequency);
+	impl->timerFrequency = frequency.QuadPart;
+
 	if (!title) {
 		title = "Window";
 	}
@@ -619,6 +624,14 @@ puglGetProcAddress(const char* name)
 	return (PuglGlFunc)wglGetProcAddress(name);
 }
 
+double
+puglGetTime(PuglView* view)
+{
+    LARGE_INTEGER count;
+    QueryPerformanceCounter(&count);
+    return double(count.QuadPart) / view->impl->timerFrequency;
+}
+
 void
 puglPostRedisplay(PuglView* view)
 {
diff --git a/pugl/pugl_x11.c b/pugl/pugl_x11.c
index 6563805..2fd6e92 100644
--- a/pugl/pugl_x11.c
+++ b/pugl/pugl_x11.c
@@ -20,6 +20,7 @@
    @file pugl_x11.c X11 Pugl Implementation.
 */
 
+#define _POSIX_C_SOURCE 199309L
 
 #include "pugl/pugl_internal.h"
 #include "pugl/pugl_x11.h"
@@ -38,6 +39,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #ifndef MIN
 #    define MIN(a, b) (((a) < (b)) ? (a) : (b))
@@ -516,6 +518,14 @@ puglProcessEvents(PuglView* view)
 	return PUGL_SUCCESS;
 }
 
+double
+puglGetTime(PuglView* view)
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return (double)ts.tv_sec + ts.tv_nsec / 1000000000.0;
+}
+
 void
 puglPostRedisplay(PuglView* view)
 {
-- 
cgit v1.2.1