vulkan: Initial Vulkan support!

This work was done by Jacob Lifshay and Mark Callow; I'm just merging it
into revision control.

src/video/SDL_vulkan_internal.h

@@ -0,0 +1,80 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#ifndef _SDL_vulkan_internal_h
+#define _SDL_vulkan_internal_h
+
+#include "../SDL_internal.h"
+
+#include "SDL_stdinc.h"
+
+#if defined(SDL_LOADSO_DISABLED)
+#undef SDL_VIDEO_VULKAN_SURFACE
+#define SDL_VIDEO_VULKAN_SURFACE 0
+#endif
+
+#if SDL_VIDEO_DRIVER_ANDROID
+#define VK_USE_PLATFORM_ANDROID_KHR
+#endif
+#if SDL_VIDEO_DRIVER_COCOA
+#define VK_USE_PLATFORM_MACOS_MVK
+#endif
+#if SDL_VIDEO_DRIVER_MIR
+#define VK_USE_PLATFORM_MIR_KHR
+#endif
+#if SDL_VIDEO_DRIVER_UIKIT
+#define VK_USE_PLATFORM_IOS_MVK
+#endif
+#if SDL_VIDEO_DRIVER_WAYLAND
+#define VK_USE_PLATFORM_WAYLAND_KHR
+#endif
+#if SDL_VIDEO_DRIVER_WINDOWS
+#define VK_USE_PLATFORM_WIN32_KHR
+#endif
+#if SDL_VIDEO_DRIVER_X11
+#define VK_USE_PLATFORM_XLIB_KHR
+#define VK_USE_PLATFORM_XCB_KHR
+#endif
+
+#if SDL_VIDEO_VULKAN_SURFACE
+
+/* Need vulkan.h for the following declarations. Must ensure the first
+ * inclusion of vulkan has the appropriate USE_PLATFORM defined, hence
+ * the above. */
+#define VK_NO_PROTOTYPES
+#include "vulkan/vulkan.h"
+
+extern const char *SDL_Vulkan_GetResultString(VkResult result);
+
+extern VkExtensionProperties *SDL_Vulkan_CreateInstanceExtensionsList(
+    PFN_vkEnumerateInstanceExtensionProperties vkEnumerateInstanceExtensionProperties,
+    Uint32 *extensionCount); /* free returned list with SDL_free */
+
+/* Implements functionality of SDL_Vulkan_GetInstanceExtensions for a list of
+ * names passed in nameCount and names. */
+extern SDL_bool SDL_Vulkan_GetInstanceExtensions_Helper(unsigned *userCount,
+                                                        const char **userNames,
+                                                        unsigned nameCount,
+                                                        const char *const *names);
+
+#endif
+
+#endif
+/* vi: set ts=4 sw=4 expandtab: */