From 699a0d2deea754ce581621ad0934da3360e63cc8 Mon Sep 17 00:00:00 2001
From: Frank Richter <frank.richter@gmail.com>
Date: Sun, 25 Aug 2019 14:19:20 +0200
Subject: [PATCH] QVulkanWindow: Add function to retrieve graphics queue family
 index

Change-Id: I51e4a006e82fbcd998815da3de6daa80558a973f
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
---
 src/gui/vulkan/qvulkanwindow.cpp | 17 +++++++++++++++++
 src/gui/vulkan/qvulkanwindow.h   |  1 +
 2 files changed, 18 insertions(+)

diff --git a/src/gui/vulkan/qvulkanwindow.cpp b/src/gui/vulkan/qvulkanwindow.cpp
index 6d12377a600..3eabf729603 100644
--- a/src/gui/vulkan/qvulkanwindow.cpp
+++ b/src/gui/vulkan/qvulkanwindow.cpp
@@ -2210,6 +2210,23 @@ VkQueue QVulkanWindow::graphicsQueue() const
     return d->gfxQueue;
 }
 
+/*!
+    Returns the family index of the active graphics queue.
+
+    \note Calling this function is only valid from the invocation of
+    QVulkanWindowRenderer::initResources() up until
+    QVulkanWindowRenderer::releaseResources(). Implementations of
+    QVulkanWindowRenderer::updateQueueCreateInfo() can also call this
+    function.
+
+    \since 5.15
+ */
+uint32_t QVulkanWindow::graphicsQueueFamilyIndex() const
+{
+    Q_D(const QVulkanWindow);
+    return d->gfxQueueFamilyIdx;
+}
+
 /*!
     Returns the active graphics command pool.
 
diff --git a/src/gui/vulkan/qvulkanwindow.h b/src/gui/vulkan/qvulkanwindow.h
index 927c81042fe..91690581380 100644
--- a/src/gui/vulkan/qvulkanwindow.h
+++ b/src/gui/vulkan/qvulkanwindow.h
@@ -112,6 +112,7 @@ public:
     const VkPhysicalDeviceProperties *physicalDeviceProperties() const;
     VkDevice device() const;
     VkQueue graphicsQueue() const;
+    uint32_t graphicsQueueFamilyIndex() const;
     VkCommandPool graphicsCommandPool() const;
     uint32_t hostVisibleMemoryIndex() const;
     uint32_t deviceLocalMemoryIndex() const;