Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

third_party/vulkan/vk_sdk_platform.h

@@ -0,0 +1,53 @@
+//
+// File: vk_sdk_platform.h
+//
+/*
+ * Copyright (c) 2015-2016 The Khronos Group Inc.
+ * Copyright (c) 2015-2016 Valve Corporation
+ * Copyright (c) 2015-2016 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and/or associated documentation files (the "Materials"), to
+ * deal in the Materials without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Materials, and to permit persons to whom the Materials are
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice(s) and this permission notice shall be included in
+ * all copies or substantial portions of the Materials.
+ *
+ * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ *
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR THE
+ * USE OR OTHER DEALINGS IN THE MATERIALS.
+ */
+
+#ifndef VK_SDK_PLATFORM_H
+#define VK_SDK_PLATFORM_H
+
+#if defined(_WIN32)
+#define NOMINMAX
+#ifndef __cplusplus
+#undef inline
+#define inline __inline
+#endif // __cplusplus
+
+#if (defined(_MSC_VER) && _MSC_VER < 1900 /*vs2015*/)
+// C99:
+// Microsoft didn't implement C99 in Visual Studio; but started adding it with
+// VS2013.  However, VS2013 still didn't have snprintf().  The following is a
+// work-around (Note: The _CRT_SECURE_NO_WARNINGS macro must be set in the
+// "CMakeLists.txt" file).
+// NOTE: This is fixed in Visual Studio 2015.
+#define snprintf _snprintf
+#endif
+
+#define strdup _strdup
+
+#endif // _WIN32
+
+#endif // VK_SDK_PLATFORM_H