diff options
author | Laszlo Agocs <laszlo.agocs@qt.io> | 2017-02-12 15:08:52 +0100 |
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committer | Laszlo Agocs <laszlo.agocs@qt.io> | 2017-03-22 15:40:57 +0000 |
commit | 8d72aba9e3358fdf51578533ab7f46602f7fd103 (patch) | |
tree | 5e6ff0ec0ee399bf343654fc9280012eafa29a3d /examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp | |
parent | 66e162e8f19f8a1f9b4f96008f2853be7fc1822e (diff) |
Introduce QVulkanWindow
A convenience subclass of QWindow that provides a Vulkan-capable
window with a double-buffered FIFO swapchain.
While advanced use cases are better served by a custom QWindow
subclass, many applications can benefit from having a convenient
helper that makes getting started easier.
Add also three examples of increasing complexity, and a variant that
shows embeddeding into widgets via QWindowContainer.
[ChangeLog][QtGui] Added QVulkanWindow, a convenience subclass of
QWindow.
Task-number: QTBUG-55981
Change-Id: I6cdc9ff1390ac6258e278377233fd369a0bfeddc
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
Diffstat (limited to 'examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp')
-rw-r--r-- | examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp b/examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp new file mode 100644 index 0000000000..0a7d1d4174 --- /dev/null +++ b/examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp @@ -0,0 +1,128 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "hellovulkanwindow.h" +#include <QVulkanFunctions> + +//! [0] +QVulkanWindowRenderer *VulkanWindow::createRenderer() +{ + return new VulkanRenderer(this); +} + +VulkanRenderer::VulkanRenderer(QVulkanWindow *w) + : m_window(w) +{ +} +//! [0] + +//! [1] +void VulkanRenderer::initResources() +{ + qDebug("initResources"); + + m_devFuncs = m_window->vulkanInstance()->deviceFunctions(m_window->device()); +} +//! [1] + +void VulkanRenderer::initSwapChainResources() +{ + qDebug("initSwapChainResources"); +} + +void VulkanRenderer::releaseSwapChainResources() +{ + qDebug("releaseSwapChainResources"); +} + +void VulkanRenderer::releaseResources() +{ + qDebug("releaseResources"); +} + +//! [2] +void VulkanRenderer::startNextFrame() +{ + m_green += 0.005f; + if (m_green > 1.0f) + m_green = 0.0f; + + VkClearColorValue clearColor = { 0.0f, m_green, 0.0f, 1.0f }; + VkClearDepthStencilValue clearDS = { 1.0f, 0 }; + VkClearValue clearValues[2]; + memset(clearValues, 0, sizeof(clearValues)); + clearValues[0].color = clearColor; + clearValues[1].depthStencil = clearDS; + + VkRenderPassBeginInfo rpBeginInfo; + memset(&rpBeginInfo, 0, sizeof(rpBeginInfo)); + rpBeginInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO; + rpBeginInfo.renderPass = m_window->defaultRenderPass(); + rpBeginInfo.framebuffer = m_window->currentFramebuffer(); + const QSize sz = m_window->swapChainImageSize(); + rpBeginInfo.renderArea.extent.width = sz.width(); + rpBeginInfo.renderArea.extent.height = sz.height(); + rpBeginInfo.clearValueCount = 2; + rpBeginInfo.pClearValues = clearValues; + VkCommandBuffer cmdBuf = m_window->currentCommandBuffer(); + m_devFuncs->vkCmdBeginRenderPass(cmdBuf, &rpBeginInfo, VK_SUBPASS_CONTENTS_INLINE); + + // Do nothing else. We will just clear to green, changing the component on + // every invocation. This also helps verifying the rate to which the thread + // is throttled to. (The elapsed time between startNextFrame calls should + // typically be around 16 ms. Note that rendering is 2 frames ahead of what + // is displayed.) + + m_devFuncs->vkCmdEndRenderPass(cmdBuf); + + m_window->frameReady(); + m_window->requestUpdate(); // render continuously, throttled by the presentation rate +} +//! [2] |