From 5d579fc8461ea0bc32ab09da690c5cdf99018219 Mon Sep 17 00:00:00 2001
From: Doug Johnson <dougvj@gmail.com>
Date: Sat, 8 Jul 2017 03:19:32 -0600
Subject: [PATCH] Add Linux vulkan init routines using xcb lib

---
 src/xenia/ui/vulkan/vulkan_context.cc  | 30 +++++++++++++++++++++++++-
 src/xenia/ui/vulkan/vulkan_instance.cc | 30 +++++++++++++++++++++++++-
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/src/xenia/ui/vulkan/vulkan_context.cc b/src/xenia/ui/vulkan/vulkan_context.cc
index 381fb0ab7..cef115278 100644
--- a/src/xenia/ui/vulkan/vulkan_context.cc
+++ b/src/xenia/ui/vulkan/vulkan_context.cc
@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2016 Ben Vanik. All rights reserved.                             *
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
  * Released under the BSD license - see LICENSE in the root for more details. *
  ******************************************************************************
  */
@@ -25,6 +25,10 @@
 #include "xenia/ui/vulkan/vulkan_util.h"
 #include "xenia/ui/window.h"
 
+#if XE_PLATFORM_LINUX
+#include "xenia/ui/window_gtk.h"
+#endif
+
 namespace xe {
 namespace ui {
 namespace vulkan {
@@ -61,6 +65,30 @@ bool VulkanContext::Initialize() {
     auto err = vkCreateWin32SurfaceKHR(*provider->instance(), &create_info,
                                        nullptr, &surface);
     CheckResult(err, "vkCreateWin32SurfaceKHR");
+#elif XE_PLATFORM_LINUX
+#ifdef GDK_WINDOWING_X11
+    GtkWidget* window_handle =
+        static_cast<GtkWidget*>(target_window_->native_handle());
+    GdkDisplay* gdk_display = gtk_widget_get_display(window_handle);
+    assert(GDK_IS_X11_DISPLAY(gdk_display));
+    xcb_connection_t* connection =
+        XGetXCBConnection(gdk_x11_display_get_xdisplay(gdk_display));
+    xcb_window_t window = gdk_x11_window_get_xid(
+            gtk_widget_get_window(window_handle));
+    VkXcbSurfaceCreateInfoKHR create_info;
+    create_info.sType = VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR;
+    create_info.pNext = nullptr;
+    create_info.flags = 0;
+    create_info.connection = static_cast<xcb_connection_t*>
+        (target_window_->native_platform_handle());
+    create_info.window =
+        static_cast<xcb_window_t>(window);
+    auto err = vkCreateXcbSurfaceKHR(*provider->instance(), &create_info,
+                                     nullptr, &surface);
+    CheckResult(err, "vkCreateXcbSurfaceKHR");
+#else
+#error Unsupported GDK Backend on Linux.
+#endif  // GDK_WINDOWING_X11
 #else
 #error Platform not yet implemented.
 #endif  // XE_PLATFORM_WIN32
diff --git a/src/xenia/ui/vulkan/vulkan_instance.cc b/src/xenia/ui/vulkan/vulkan_instance.cc
index cb7a3ee91..6aaa8c41c 100644
--- a/src/xenia/ui/vulkan/vulkan_instance.cc
+++ b/src/xenia/ui/vulkan/vulkan_instance.cc
@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2016 Ben Vanik. All rights reserved.                             *
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
  * Released under the BSD license - see LICENSE in the root for more details. *
  ******************************************************************************
  */
@@ -26,6 +26,10 @@
 #include "xenia/ui/vulkan/vulkan_util.h"
 #include "xenia/ui/window.h"
 
+#if XE_PLATFORM_LINUX
+#include "xenia/ui/window_gtk.h"
+#endif
+
 #define VK_API_VERSION VK_API_VERSION_1_0
 
 namespace xe {
@@ -385,6 +389,30 @@ bool VulkanInstance::QueryDevices(Window* any_target_window) {
     create_info.hwnd = static_cast<HWND>(any_target_window->native_handle());
     err = vkCreateWin32SurfaceKHR(handle, &create_info, nullptr, &any_surface);
     CheckResult(err, "vkCreateWin32SurfaceKHR");
+#elif XE_PLATFORM_LINUX
+#ifdef GDK_WINDOWING_X11
+    GtkWidget* window_handle =
+        static_cast<GtkWidget*>(any_target_window->native_handle());
+    GdkDisplay* gdk_display = gtk_widget_get_display(window_handle);
+    assert(GDK_IS_X11_DISPLAY(gdk_display));
+    xcb_connection_t* connection =
+        XGetXCBConnection(gdk_x11_display_get_xdisplay(gdk_display));
+    xcb_window_t window = gdk_x11_window_get_xid(
+            gtk_widget_get_window(window_handle));
+    VkXcbSurfaceCreateInfoKHR create_info;
+    create_info.sType = VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR;
+    create_info.pNext = nullptr;
+    create_info.flags = 0;
+    create_info.connection = static_cast<xcb_connection_t*>
+        (any_target_window->native_platform_handle());
+    create_info.window =
+        static_cast<xcb_window_t>(window);
+    auto err = vkCreateXcbSurfaceKHR(handle, &create_info,
+                                     nullptr, &any_surface);
+    CheckResult(err, "vkCreateXcbSurfaceKHR");
+#else
+#error Unsupported GDK Backend on Linux.
+#endif  // GDK_WINDOWING_X11
 #else
 #error Platform not yet implemented.
 #endif  // XE_PLATFORM_WIN32