shader.cpp Example File

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  #include "shader.h"
  #include <QtConcurrentRun>
  #include <QFile>
  #include <QVulkanDeviceFunctions>

  void Shader::load(QVulkanInstance *inst, VkDevice dev, const QString &fn)
  {
      reset();
      m_maybeRunning = true;
      m_future = QtConcurrent::run([inst, dev, fn]() {
          ShaderData sd;
          QFile f(fn);
          if (!f.open(QIODevice::ReadOnly)) {
              qWarning("Failed to open %s", qPrintable(fn));
              return sd;
          }
          QByteArray blob = f.readAll();
          VkShaderModuleCreateInfo shaderInfo;
          memset(&shaderInfo, 0, sizeof(shaderInfo));
          shaderInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
          shaderInfo.codeSize = blob.size();
          shaderInfo.pCode = reinterpret_cast<const uint32_t *>(blob.constData());
          VkResult err = inst->deviceFunctions(dev)->vkCreateShaderModule(dev, &shaderInfo, nullptr, &sd.shaderModule);
          if (err != VK_SUCCESS) {
              qWarning("Failed to create shader module: %d", err);
              return sd;
          }
          return sd;
      });
  }

  ShaderData *Shader::data()
  {
      if (m_maybeRunning && !m_data.isValid())
          m_data = m_future.result();

      return &m_data;
  }

  void Shader::reset()
  {
      *data() = ShaderData();
      m_maybeRunning = false;
  }