[Vulkan] Add DisplayVkNull

BUILD.gn

@@ -132,7 +132,9 @@ config("internal_config") {
     defines += [ "__ggp__" ]
   }
 
-  if (angle_use_vulkan_display) {
+  if (angle_use_vulkan_null_display) {
+    defines += [ "ANGLE_USE_VULKAN_NULL_DISPLAY" ]
+  } else if (angle_use_vulkan_display) {
     defines += [
       "ANGLE_USE_VULKAN_DISPLAY",
       "EGL_NO_X11",

gni/angle.gni

@@ -129,6 +129,10 @@ declare_args() {
        (is_linux && (angle_use_x11 || angle_use_vulkan_display) &&
         !is_chromeos) || is_android || is_fuchsia || is_ggp || is_mac)
 
+  # When set to true, ANGLE will not use VK_KHR_surface and VK_KHR_swapchain
+  # extensions. Content can be rendered only off-screen.
+  angle_use_vulkan_null_display = build_with_chromium && is_fuchsia
+
   # Disable null backend to save space for official build.
   angle_enable_null = !is_official_build
   angle_enable_gl_desktop = !is_android && !is_ios

src/common/vulkan/BUILD.gn

@@ -31,9 +31,11 @@ group("angle_vulkan_entry_points") {
   if (is_fuchsia) {
     public_deps += [
       "$angle_root/src/common/fuchsia_egl",
-      "//third_party/fuchsia-sdk:vulkan_base",
       "//third_party/fuchsia-sdk/sdk/pkg/vulkan",
     ]
+    if (!angle_use_vulkan_null_display) {
+      public_deps += [ "//third_party/fuchsia-sdk/sdk/pkg/vulkan_layers:VkLayer_image_pipe_swapchain" ]
+    }
   } else if (!is_android && !is_ggp) {
     if (angle_shared_libvulkan) {
       data_deps = [ "$angle_vulkan_loader_dir:libvulkan" ]

src/libANGLE/Display.cpp

@@ -356,7 +356,12 @@ rx::DisplayImpl *CreateDisplayFromAttribs(EGLAttrib displayType,
 
         case EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE:
 #if defined(ANGLE_ENABLE_VULKAN)
-#    if defined(ANGLE_PLATFORM_WINDOWS)
+#    if defined(ANGLE_USE_VULKAN_NULL_DISPLAY)
+            if (rx::IsVulkanNullDisplayAvailable())
+            {
+                impl = rx::CreateVulkanNullDisplay(state);
+            }
+#    elif defined(ANGLE_PLATFORM_WINDOWS)
             if (rx::IsVulkanWin32DisplayAvailable())
             {
                 impl = rx::CreateVulkanWin32Display(state);

src/libANGLE/renderer/vulkan/BUILD.gn

@@ -115,6 +115,15 @@ if (angle_enable_cl) {
   ]
 }
 
+if (angle_use_vulkan_null_display) {
+  _vulkan_backend_sources += [
+    "null/DisplayVkNull.cpp",
+    "null/DisplayVkNull.h",
+    "null/WindowSurfaceVkNull.cpp",
+    "null/WindowSurfaceVkNull.h",
+  ]
+}
+
 if (is_linux) {
   _vulkan_backend_sources += [
     "display/DisplayVkSimple.cpp",

src/libANGLE/renderer/vulkan/DisplayVk.cpp

@@ -260,6 +260,11 @@ const char *DisplayVk::getWSILayer() const
     return nullptr;
 }
 
+bool DisplayVk::isUsingSwapchain() const
+{
+    return true;
+}
+
 bool DisplayVk::getScratchBuffer(size_t requstedSizeBytes,
                                  angle::MemoryBuffer **scratchBufferOut) const
 {

src/libANGLE/renderer/vulkan/DisplayVk.h

@@ -123,6 +123,7 @@ class DisplayVk : public DisplayImpl, public vk::Context
 
     virtual const char *getWSIExtension() const = 0;
     virtual const char *getWSILayer() const;
+    virtual bool isUsingSwapchain() const;
 
     // Determine if a config with given formats and sample counts is supported.  This callback may
     // modify the config to add or remove platform specific attributes such as nativeVisualID.  If

src/libANGLE/renderer/vulkan/DisplayVk_api.h

@@ -14,6 +14,10 @@
 
 namespace rx
 {
+
+bool IsVulkanNullDisplayAvailable();
+DisplayImpl *CreateVulkanNullDisplay(const egl::DisplayState &state);
+
 #if defined(ANGLE_PLATFORM_WINDOWS)
 bool IsVulkanWin32DisplayAvailable();
 DisplayImpl *CreateVulkanWin32Display(const egl::DisplayState &state);

src/libANGLE/renderer/vulkan/RendererVk.cpp

@@ -926,8 +926,15 @@ angle::Result RendererVk::initialize(DisplayVk *displayVk,
     }
 
     vk::ExtensionNameList enabledInstanceExtensions;
-    enabledInstanceExtensions.push_back(VK_KHR_SURFACE_EXTENSION_NAME);
-    enabledInstanceExtensions.push_back(wsiExtension);
+    if (displayVk->isUsingSwapchain())
+    {
+        enabledInstanceExtensions.push_back(VK_KHR_SURFACE_EXTENSION_NAME);
+    }
+
+    if (wsiExtension)
+    {
+        enabledInstanceExtensions.push_back(wsiExtension);
+    }
     mEnableDebugUtils = mEnableValidationLayers &&
                         ExtensionFound(VK_EXT_DEBUG_UTILS_EXTENSION_NAME, instanceExtensionNames);
 
@@ -1425,7 +1432,10 @@ angle::Result RendererVk::initializeDevice(DisplayVk *displayVk, uint32_t queueF
     }
 
     vk::ExtensionNameList enabledDeviceExtensions;
-    enabledDeviceExtensions.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
+    if (displayVk->isUsingSwapchain())
+    {
+        enabledDeviceExtensions.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
+    }
 
     // Queues: map low, med, high priority to whatever is supported up to 3 queues
     uint32_t queueCount = std::min(mQueueFamilyProperties[queueFamilyIndex].queueCount,

src/libANGLE/renderer/vulkan/null/DisplayVkNull.cpp

+//
+// Copyright 2021 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.
+//
+// DisplayVkNull.cpp:
+//    Implements the class methods for DisplayVkNull.
+//
+
+#include "DisplayVkNull.h"
+#include "WindowSurfaceVkNull.h"
+
+#include "libANGLE/Display.h"
+#include "libANGLE/renderer/vulkan/RendererVk.h"
+#include "libANGLE/renderer/vulkan/vk_caps_utils.h"
+
+namespace rx
+{
+
+DisplayVkNull::DisplayVkNull(const egl::DisplayState &state) : DisplayVk(state) {}
+
+bool DisplayVkNull::isValidNativeWindow(EGLNativeWindowType window) const
+{
+    return false;
+}
+
+SurfaceImpl *DisplayVkNull::createWindowSurfaceVk(const egl::SurfaceState &state,
+                                                  EGLNativeWindowType window)
+{
+    return new WindowSurfaceVkNull(state, window);
+}
+
+const char *DisplayVkNull::getWSIExtension() const
+{
+    return nullptr;
+}
+
+bool DisplayVkNull::isUsingSwapchain() const
+{
+    return false;
+}
+
+egl::ConfigSet DisplayVkNull::generateConfigs()
+{
+    constexpr GLenum kColorFormats[] = {GL_RGBA8, GL_BGRA8_EXT, GL_RGB565, GL_RGB8};
+
+    return egl_vk::GenerateConfigs(kColorFormats, egl_vk::kConfigDepthStencilFormats, this);
+}
+
+void DisplayVkNull::checkConfigSupport(egl::Config *config)
+{
+    config->surfaceType &= ~EGL_WINDOW_BIT;
+}
+
+bool IsVulkanNullDisplayAvailable()
+{
+    return true;
+}
+
+DisplayImpl *CreateVulkanNullDisplay(const egl::DisplayState &state)
+{
+    return new DisplayVkNull(state);
+}
+
+}  // namespace rx

src/libANGLE/renderer/vulkan/null/DisplayVkNull.h

+//
+// Copyright 2021 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.
+//
+// DisplayVkNull.h:
+//    Defines the class interface for DisplayVkNull, implementing
+//    DisplayVk that doesn't depend on Vulkan extensions. It cannot be
+//    used to output any content to a surface.
+//
+
+#ifndef LIBANGLE_RENDERER_VULKAN_NULL_DISPLAYVKNULL_H_
+#define LIBANGLE_RENDERER_VULKAN_NULL_DISPLAYVKNULL_H_
+
+#include "libANGLE/renderer/vulkan/DisplayVk.h"
+
+namespace rx
+{
+
+class DisplayVkNull : public DisplayVk
+{
+  public:
+    DisplayVkNull(const egl::DisplayState &state);
+
+    bool isValidNativeWindow(EGLNativeWindowType window) const override;
+
+    SurfaceImpl *createWindowSurfaceVk(const egl::SurfaceState &state,
+                                       EGLNativeWindowType window) override;
+
+    virtual const char *getWSIExtension() const override;
+    bool isUsingSwapchain() const override;
+    egl::ConfigSet generateConfigs() override;
+    void checkConfigSupport(egl::Config *config) override;
+
+  private:
+    std::vector<VkSurfaceFormatKHR> mSurfaceFormats;
+};
+
+}  // namespace rx
+
+#endif  // LIBANGLE_RENDERER_VULKAN_NULL_DISPLAYVKNULL_H_

src/libANGLE/renderer/vulkan/null/WindowSurfaceVkNull.cpp

+//
+// Copyright 2021 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.
+//
+// WindowSurfaceVkNull.cpp:
+//    Implements the class methods for WindowSurfaceVkNull.
+//
+
+#include "WindowSurfaceVkNull.h"
+#include "libANGLE/renderer/vulkan/RendererVk.h"
+
+namespace rx
+{
+
+WindowSurfaceVkNull::WindowSurfaceVkNull(const egl::SurfaceState &surfaceState,
+                                         EGLNativeWindowType window)
+    : WindowSurfaceVk(surfaceState, window)
+{}
+
+WindowSurfaceVkNull::~WindowSurfaceVkNull() {}
+
+angle::Result WindowSurfaceVkNull::createSurfaceVk(vk::Context *context, gl::Extents *extentsOut)
+{
+    return angle::Result::Stop;
+}
+
+angle::Result WindowSurfaceVkNull::getCurrentWindowSize(vk::Context *context,
+                                                        gl::Extents *extentsOut)
+{
+    return angle::Result::Stop;
+}
+
+}  // namespace rx

src/libANGLE/renderer/vulkan/null/WindowSurfaceVkNull.h

+//
+// Copyright 2021 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.
+//
+// WindowSurfaceVkNull.h:
+//    Defines the class interface for WindowSurfaceVkNull, implementing WindowSurfaceVk.
+//
+
+#ifndef LIBANGLE_RENDERER_VULKAN_NULL_WINDOWSURFACEVKNULL_H_
+#define LIBANGLE_RENDERER_VULKAN_NULL_WINDOWSURFACEVKNULL_H_
+
+#include "libANGLE/renderer/vulkan/SurfaceVk.h"
+
+namespace rx
+{
+
+class WindowSurfaceVkNull final : public WindowSurfaceVk
+{
+  public:
+    WindowSurfaceVkNull(const egl::SurfaceState &surfaceState, EGLNativeWindowType window);
+    ~WindowSurfaceVkNull() final;
+
+  private:
+    angle::Result createSurfaceVk(vk::Context *context, gl::Extents *extentsOut) override;
+    angle::Result getCurrentWindowSize(vk::Context *context, gl::Extents *extentsOut) override;
+};
+
+}  // namespace rx
+
+#endif  // LIBANGLE_RENDERER_VULKAN_NULL_WINDOWSURFACEVKNULL_H_