Qt 5.11 | Qt GUI | Hello Vulkan Cubes Example | shader.cpp Example File

Qt 5.11.3 Reference Documentation

# shader.cpp Example File

hellovulkancubes/shader.cpp

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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;
      }