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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#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]
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