Add a version number to Cycles standalone

Now Cycles has its own versioning, that is mainly interesting for external projects, which integrate the engine.

We start with version 1.7.0. Reasons for that:

* The engine is too mature for a 1.0 release.
* We assume that Cycles inside of Blender 2.61 was version 0.1. We count upwards in 0.1 steps, therefore Cycles inside of Blender 2.77 would be 1.7.

We use a common versioning scheme here, with 3 decimals for the major, minor and patch level.

At the moment cycles --version can be used to display the version, easy to parse for external projects. The info will be added to the UI later aswell.

intern/cycles/app/cycles_standalone.cpp

@@ -32,6 +32,7 @@
 #include "util_string.h"
 #include "util_time.h"
 #include "util_transform.h"
+#include "util_version.h"
 
 #ifdef WITH_CYCLES_STANDALONE_GUI
 #include "util_view.h"
@@ -358,7 +359,7 @@ static void options_parse(int argc, const char **argv)
 
 	/* parse options */
 	ArgParse ap;
-	bool help = false, debug = false;
+	bool help = false, debug = false, version = false;
 	int verbosity = 1;
 
 	ap.options ("Usage: cycles [options] file.xml",
@@ -380,6 +381,7 @@ static void options_parse(int argc, const char **argv)
 		"--verbose %d", &verbosity, "Set verbosity of the logger",
 #endif
 		"--help", &help, "Print help message",
+		"--version", &version, "Print version number",
 		NULL);
 
 	if(ap.parse(argc, argv) < 0) {
@@ -406,6 +408,10 @@ static void options_parse(int argc, const char **argv)
 
 		exit(EXIT_SUCCESS);
 	}
+	else if(version) {
+		printf("%s\n", cycles_version_number().c_str());
+		exit(EXIT_SUCCESS);
+	}
 	else if(help || options.filepath == "") {
 		ap.usage();
 		exit(EXIT_SUCCESS);

intern/cycles/util/CMakeLists.txt

@@ -78,6 +78,7 @@ set(SRC_HEADERS
 	util_transform.h
 	util_types.h
 	util_vector.h
+	util_version.h
 	util_view.h
 	util_windows.h
 	util_xml.h

intern/cycles/util/util_version.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2011-2016 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __UTIL_VERSION_H__
+#define __UTIL_VERSION_H__
+
+/* Cycles version number */
+
+#include <util_string.h>
+
+CCL_NAMESPACE_BEGIN
+
+#define CYCLES_VERSION_MAJOR	1
+#define CYCLES_VERSION_MINOR	7
+#define CYCLES_VERSION_PATCH	0
+
+/* Create string number, like "1.7.0" */
+string cycles_version_number()
+{
+	stringstream ss;
+	ss << CYCLES_VERSION_MAJOR << "."
+       << CYCLES_VERSION_MINOR << "."
+       << CYCLES_VERSION_PATCH;
+
+	return ss.str();
+}
+
+CCL_NAMESPACE_END
+
+#endif /* __UTIL_VERSION_H__ */
+