Add blender launcher application when building with MSVC

Main idea of this change is to make a small executable which
will set OMP_WAIT_POLICY environment variable and then will
launch blender itself.

This is a teporary solution for the time being we'll have a
more clear solution to high CPU usage with OpenMP when building
with MSVC.

Reviewers: campbellbarton, juicyfruit

Reviewed By: juicyfruit

Differential Revision: https://developer.blender.org/D717

SConstruct

@@ -832,7 +832,17 @@ for x in B.create_blender_liblist(env, 'system'):
     thelibincs.append(os.path.dirname(x))
 
 if 'blender' in B.targets or not env['WITH_BF_NOBLENDER']:
-    env.BlenderProg(B.root_build_dir, "blender", creob + mainlist + thestatlibs + dobj, thesyslibs, [B.root_build_dir+'/lib'] + thelibincs, 'blender')
+    blender_progname = "blender"
+    if env['OURPLATFORM'] in ('win32-vc', 'win32-mingw', 'win64-vc', 'linuxcross'):
+        blender_progname = "blender-app"
+
+        lenv = env.Clone()
+        lenv.Append(LINKFLAGS = env['PLATFORM_LINKFLAGS'])
+        targetpath = B.root_build_dir + '/blender'
+        launcher_obj = [env.Object(B.root_build_dir + 'source/creator/creator/creator_launch_win', ['#source/creator/creator_launch_win.c'])]
+        env.BlenderProg(B.root_build_dir, 'blender', [launcher_obj] + B.resources, [], [], 'blender')
+
+    env.BlenderProg(B.root_build_dir, blender_progname, creob + mainlist + thestatlibs + dobj, thesyslibs, [B.root_build_dir+'/lib'] + thelibincs, 'blender')
 if env['WITH_BF_PLAYER']:
     playerlist = B.create_blender_liblist(env, 'player')
     playerlist += B.create_blender_liblist(env, 'player2')
@@ -882,6 +892,9 @@ if env['OURPLATFORM']!='darwin':
         td, tf = os.path.split(targetdir)
         dotblenderinstall.append(env.Install(dir=td, source=srcfile))
 
+    scriptinstall.append(env.InstallAs(env['BF_INSTALLDIR'] + '/blender-app.exe.manifest',
+                                       'source/icons/blender.exe.manifest'))
+
     if env['WITH_BF_PYTHON']:
         #-- local/VERSION/scripts
         scriptpaths=['release/scripts']

source/creator/CMakeLists.txt

@@ -932,3 +932,18 @@ setup_blender_sorted_libs()
 target_link_libraries(blender ${BLENDER_SORTED_LIBS})
 
 setup_liblinks(blender)
+
+# -----------------------------------------------------------------------------
+# Setup launcher
+
+if(WIN32 AND NOT WITH_PYTHON_MODULE)
+	set(LAUNCHER_SRC
+		creator_launch_win.c
+		../icons/winblender.rc
+	)
+	add_executable(blender-launcher ${LAUNCHER_SRC})
+	target_link_libraries(blender-launcher ${PLATFORM_LINKLIBS})
+
+	set_target_properties(blender PROPERTIES OUTPUT_NAME blender-app)
+	set_target_properties(blender-launcher PROPERTIES OUTPUT_NAME blender)
+endif()

source/creator/creator_launch_win.c

@@ -0,0 +1,63 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2014 by Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Sergey Sharybin.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#pragma comment(linker, "/subsystem:windows")
+
+/* Binary name to launch. */
+#define BLENDER_BINARY "blender-app.exe"
+
+#define WIN32_LEAN_AND_MEAN
+#include <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+
+int WINAPI WinMain(HINSTANCE hInstance,
+                   HINSTANCE hPrevInstance,
+                   LPSTR lpCmdLine,
+                   int nCmdShow)
+{
+	PROCESS_INFORMATION processInformation = {0};
+	STARTUPINFOA startupInfo = {0};
+	BOOL result;
+
+	_putenv_s("OMP_WAIT_POLICY", "PASSIVE");
+
+	startupInfo.cb = sizeof(startupInfo);
+	result = CreateProcessA(NULL, BLENDER_BINARY, NULL, NULL, FALSE,
+	                       0, NULL, NULL,
+	                       &startupInfo, &processInformation);
+
+	if (!result) {
+		fprintf(stderr, "Error launching " BLENDER_BINARY "\n");
+		return EXIT_FAILURE;
+	}
+
+	WaitForSingleObject(processInformation.hProcess, INFINITE);
+
+	CloseHandle(processInformation.hProcess);
+	CloseHandle(processInformation.hThread);
+
+	return EXIT_SUCCESS;
+}