kc3-lang/angle/src/libANGLE/renderer/vulkan/headless/WindowSurfaceVkHeadless.cpp

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• Hash : 1f344d60
  Author :
  Date : 2020-11-05T16:33:42
  

  Vulkan: Add support for headless surface
  
  How to enable:
  add below args config to args.gn in linux build
  
  ```
  use_x11=false
  use_ozone=false
  angle_vulkan_display_mode="headless"
  ```
  
  Bug: angleproject:5260
  Change-Id: Iec931e74c061b56376ef028814859aa58af07f2f
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2536518
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/libANGLE/renderer/vulkan/headless/WindowSurfaceVkHeadless.cpp

• //
  // Copyright 2020 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // WindowSurfaceVkHeadless.cpp:
  //    Implements the class methods for WindowSurfaceVkHeadless.
  //
  
  #include "WindowSurfaceVkHeadless.h"
  #include "libANGLE/renderer/vulkan/RendererVk.h"
  
  namespace rx
  {
  
  WindowSurfaceVkHeadless::WindowSurfaceVkHeadless(const egl::SurfaceState &surfaceState,
                                                   EGLNativeWindowType window)
      : WindowSurfaceVk(surfaceState, window)
  {}
  
  WindowSurfaceVkHeadless::~WindowSurfaceVkHeadless() {}
  
  angle::Result WindowSurfaceVkHeadless::createSurfaceVk(vk::Context *context,
                                                         gl::Extents *extentsOut)
  {
      RendererVk *renderer = context->getRenderer();
      ASSERT(renderer != nullptr);
      VkInstance instance = renderer->getInstance();
  
      VkHeadlessSurfaceCreateInfoEXT createInfo = {};
      createInfo.sType                          = VK_STRUCTURE_TYPE_HEADLESS_SURFACE_CREATE_INFO_EXT;
  
      ANGLE_VK_TRY(context, vkCreateHeadlessSurfaceEXT(instance, &createInfo, nullptr, &mSurface));
  
      return getCurrentWindowSize(context, extentsOut);
  }
  
  angle::Result WindowSurfaceVkHeadless::getCurrentWindowSize(vk::Context *context,
                                                              gl::Extents *extentsOut)
  {
      const VkPhysicalDevice &physicalDevice = context->getRenderer()->getPhysicalDevice();
      ANGLE_VK_TRY(context, vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physicalDevice, mSurface,
                                                                      &mSurfaceCaps));
  
      // Spec: "For headless surfaces, currentExtent is the reserved value (0xFFFFFFFF, 0xFFFFFFFF).
      // Whatever the application sets a swapchain's imageExtent to will be the size of the surface,
      // after the first image is presented."
      // For ANGLE, in headless mode, we share the same 'SimpleDisplayWindow' structure with front
      // EGL window info to define the vulkan backend surface/image extents.
      angle::vk::SimpleDisplayWindow *simpleWindow =
          reinterpret_cast<angle::vk::SimpleDisplayWindow *>(mNativeWindowType);
  
      // Update surface extent before output the new extent.
      mSurfaceCaps.currentExtent.width  = simpleWindow->width;
      mSurfaceCaps.currentExtent.height = simpleWindow->height;
  
      *extentsOut =
          gl::Extents(mSurfaceCaps.currentExtent.width, mSurfaceCaps.currentExtent.height, 1);
  
      return angle::Result::Continue;
  }
  
  }  // namespace rx
  

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