vulkan: Initial Vulkan support!

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

src/video/wayland/SDL_waylandvideo.c

@@ -35,6 +35,7 @@
 #include "SDL_waylandmouse.h"
 #include "SDL_waylandtouch.h"
 #include "SDL_waylandclipboard.h"
+#include "SDL_waylandvulkan.h"
 
 #include <sys/types.h>
 #include <unistd.h>
@@ -181,6 +182,13 @@ Wayland_CreateDevice(int devindex)
     device->GetClipboardText = Wayland_GetClipboardText;
     device->HasClipboardText = Wayland_HasClipboardText;
 
+#if SDL_VIDEO_VULKAN_SURFACE
+    device->Vulkan_LoadLibrary = Wayland_Vulkan_LoadLibrary;
+    device->Vulkan_UnloadLibrary = Wayland_Vulkan_UnloadLibrary;
+    device->Vulkan_GetInstanceExtensions = Wayland_Vulkan_GetInstanceExtensions;
+    device->Vulkan_CreateSurface = Wayland_Vulkan_CreateSurface;
+#endif
+
     device->free = Wayland_DeleteDevice;
 
     return device;

src/video/wayland/SDL_waylandvulkan.c

@@ -0,0 +1,175 @@
+/*
+  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.
+*/
+
+/*
+ * @author Mark Callow, www.edgewise-consulting.com. Based on Jacob Lifshay's
+ * SDL_x11vulkan.c.
+ */
+
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_VULKAN_SURFACE && SDL_VIDEO_DRIVER_WAYLAND
+
+#include "SDL_waylandvideo.h"
+#include "SDL_waylandwindow.h"
+#include "SDL_assert.h"
+
+#include "SDL_loadso.h"
+#include "SDL_waylandvulkan.h"
+#include "SDL_syswm.h"
+
+int Wayland_Vulkan_LoadLibrary(_THIS, const char *path)
+{
+    VkExtensionProperties *extensions = NULL;
+    Uint32 extensionCount = 0;
+    SDL_bool hasSurfaceExtension = SDL_FALSE;
+    SDL_bool hasWaylandSurfaceExtension = SDL_FALSE;
+    PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr = NULL;
+    if(_this->vulkan_config.loader_handle)
+        return SDL_SetError("Vulkan already loaded");
+
+    /* Load the Vulkan loader library */
+    if(!path)
+        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+    if(!path)
+        path = "libvulkan.so.1";
+    _this->vulkan_config.loader_handle = SDL_LoadObject(path);
+    if(!_this->vulkan_config.loader_handle)
+        return -1;
+    SDL_strlcpy(_this->vulkan_config.loader_path, path,
+                SDL_arraysize(_this->vulkan_config.loader_path));
+    vkGetInstanceProcAddr = (PFN_vkGetInstanceProcAddr)SDL_LoadFunction(
+        _this->vulkan_config.loader_handle, "vkGetInstanceProcAddr");
+    if(!vkGetInstanceProcAddr)
+        goto fail;
+    _this->vulkan_config.vkGetInstanceProcAddr = (void *)vkGetInstanceProcAddr;
+    _this->vulkan_config.vkEnumerateInstanceExtensionProperties =
+        (void *)((PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr)(
+            VK_NULL_HANDLE, "vkEnumerateInstanceExtensionProperties");
+    if(!_this->vulkan_config.vkEnumerateInstanceExtensionProperties)
+        goto fail;
+    extensions = SDL_Vulkan_CreateInstanceExtensionsList(
+        (PFN_vkEnumerateInstanceExtensionProperties)
+            _this->vulkan_config.vkEnumerateInstanceExtensionProperties,
+        &extensionCount);
+    if(!extensions)
+        goto fail;
+    for(Uint32 i = 0; i < extensionCount; i++)
+    {
+        if(SDL_strcmp(VK_KHR_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
+            hasSurfaceExtension = SDL_TRUE;
+        else if(SDL_strcmp(VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
+            hasWaylandSurfaceExtension = SDL_TRUE;
+    }
+    SDL_free(extensions);
+    if(!hasSurfaceExtension)
+    {
+        SDL_SetError("Installed Vulkan doesn't implement the "
+                     VK_KHR_SURFACE_EXTENSION_NAME " extension");
+        goto fail;
+    }
+    else if(!hasWaylandSurfaceExtension)
+    {
+        SDL_SetError("Installed Vulkan doesn't implement the "
+                     VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME "extension");
+        goto fail;
+    }
+    return 0;
+
+fail:
+    SDL_UnloadObject(_this->vulkan_config.loader_handle);
+    _this->vulkan_config.loader_handle = NULL;
+    return -1;
+}
+
+void Wayland_Vulkan_UnloadLibrary(_THIS)
+{
+    if(_this->vulkan_config.loader_handle)
+    {
+        SDL_UnloadObject(_this->vulkan_config.loader_handle);
+        _this->vulkan_config.loader_handle = NULL;
+    }
+}
+
+SDL_bool Wayland_Vulkan_GetInstanceExtensions(_THIS,
+                                          SDL_Window *window,
+                                          unsigned *count,
+                                          const char **names)
+{
+    static const char *const extensionsForWayland[] = {
+        VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME
+    };
+    if(!_this->vulkan_config.loader_handle)
+    {
+        SDL_SetError("Vulkan is not loaded");
+        return SDL_FALSE;
+    }
+    return SDL_Vulkan_GetInstanceExtensions_Helper(
+            count, names, SDL_arraysize(extensionsForWayland),
+            extensionsForWayland);
+}
+
+SDL_bool Wayland_Vulkan_CreateSurface(_THIS,
+                                  SDL_Window *window,
+                                  VkInstance instance,
+                                  VkSurfaceKHR *surface)
+{
+    SDL_WindowData *windowData = (SDL_WindowData *)window->driverdata;
+    PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr =
+        (PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr;
+    PFN_vkCreateWaylandSurfaceKHR vkCreateWaylandSurfaceKHR =
+        (PFN_vkCreateWaylandSurfaceKHR)vkGetInstanceProcAddr(
+                                            (VkInstance)instance,
+                                            "vkCreateWaylandSurfaceKHR");
+    VkWaylandSurfaceCreateInfoKHR createInfo = {};
+    VkResult result;
+
+    if(!_this->vulkan_config.loader_handle)
+    {
+        SDL_SetError("Vulkan is not loaded");
+        return SDL_FALSE;
+    }
+
+    if(!vkCreateWaylandSurfaceKHR)
+    {
+        SDL_SetError(VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME
+                     " extension is not enabled in the Vulkan instance.");
+        return SDL_FALSE;
+    }
+    createInfo.sType = VK_STRUCTURE_TYPE_WAYLAND_SURFACE_CREATE_INFO_KHR;
+    createInfo.pNext = NULL;
+    createInfo.flags = 0;
+    createInfo.display = windowData->waylandData->display;
+    createInfo.surface =  windowData->surface;
+    result = vkCreateWaylandSurfaceKHR(instance, &createInfo,
+                                       NULL, surface);
+    if(result != VK_SUCCESS)
+    {
+        SDL_SetError("vkCreateWaylandSurfaceKHR failed: %s",
+                     SDL_Vulkan_GetResultString(result));
+        return SDL_FALSE;
+    }
+    return SDL_TRUE;
+}
+
+#endif
+
+/* vim: set ts=4 sw=4 expandtab: */

src/video/wayland/SDL_waylandvulkan.h

@@ -0,0 +1,52 @@
+/*
+  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.
+*/
+
+/*
+ * @author Mark Callow, www.edgewise-consulting.com. Based on Jacob Lifshay's
+ * SDL_x11vulkan.h.
+ */
+
+#include "../../SDL_internal.h"
+
+#ifndef _SDL_waylandvulkan_h
+#define _SDL_waylandvulkan_h
+
+#include "../SDL_vulkan_internal.h"
+#include "../SDL_sysvideo.h"
+
+#if SDL_VIDEO_VULKAN_SURFACE && SDL_VIDEO_DRIVER_WAYLAND
+
+int Wayland_Vulkan_LoadLibrary(_THIS, const char *path);
+void Wayland_Vulkan_UnloadLibrary(_THIS);
+SDL_bool Wayland_Vulkan_GetInstanceExtensions(_THIS,
+                                          SDL_Window *window,
+                                          unsigned *count,
+                                          const char **names);
+SDL_bool Wayland_Vulkan_CreateSurface(_THIS,
+                                  SDL_Window *window,
+                                  VkInstance instance,
+                                  VkSurfaceKHR *surface);
+
+#endif
+
+#endif /* _SDL_waylandvulkan_h */
+
+/* vi: set ts=4 sw=4 expandtab: */