From bd38e9e98f97f8389aba2aad58da1bbe7f5c90ff Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Tue, 24 Dec 2019 21:31:08 +0100
Subject: [PATCH] Adding source/Platform/Unix/X11SharedDisplay.cpp

---
 engine.build.lua                          |  1 +
 source/Platform/Unix/X11SharedDisplay.cpp | 32 +++++++++++++++++++++++
 source/Platform/Unix/X11SharedDisplay.h   | 15 +++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 source/Platform/Unix/X11SharedDisplay.cpp
 create mode 100644 source/Platform/Unix/X11SharedDisplay.h

diff --git a/engine.build.lua b/engine.build.lua
index 24c1821..55ff80f 100644
--- a/engine.build.lua
+++ b/engine.build.lua
@@ -65,6 +65,7 @@ if TARGET_OS == "Win32" then
 elseif TARGET_OS == "Unix" then
 	platform_spec_module = Module("source/Platform/Unix", {
 		"UnixApplication.cpp",
+		"X11SharedDisplay.cpp",
 		"X11Display.cpp",
 		"GLXContext.cpp",
 		"X11Input.cpp",
diff --git a/source/Platform/Unix/X11SharedDisplay.cpp b/source/Platform/Unix/X11SharedDisplay.cpp
new file mode 100644
index 0000000..bb76064
--- /dev/null
+++ b/source/Platform/Unix/X11SharedDisplay.cpp
@@ -0,0 +1,32 @@
+
+#include "X11SharedDisplay.h"
+
+namespace sp {
+
+// Define a global display (for simplicity, we always connect to local one.)
+::Display* sharedDisplay = NULL;
+unsigned int refcount = 0;
+
+::Display* XGetDisplay() {
+
+	// Create if we dont have any references.
+	if (refcount == 0) {
+		sharedDisplay = XOpenDisplay(NULL);
+	}
+
+	refcount++;
+	return sharedDisplay;
+}
+
+void XReleaseDisplay() {
+
+	if (refcount < 1) {
+		return;
+	}
+
+	if (--refcount == 0) {
+		XCloseDisplay(sharedDisplay);
+	}
+}
+
+} // namespace sp
diff --git a/source/Platform/Unix/X11SharedDisplay.h b/source/Platform/Unix/X11SharedDisplay.h
new file mode 100644
index 0000000..91de116
--- /dev/null
+++ b/source/Platform/Unix/X11SharedDisplay.h
@@ -0,0 +1,15 @@
+
+#ifndef SPECTRE_PLATFORM_UNIX_X11SHAREDDISPLAY_H
+#define SPECTRE_PLATFORM_UNIX_X11SHAREDDISPLAY_H
+
+#include <X11/Xlib.h>
+
+namespace sp {
+
+::Display* XGetDisplay();
+
+void XReleaseDisplay();
+
+} // namespace sp
+
+#endif /* SPECTRE_PLATFORM_UNIX_X11SHAREDDISPLAY_H */