Add test context for loading swiftshader so

Author: bdero

shell/config.gni

@@ -6,14 +6,13 @@ declare_args() {
   shell_enable_gl = !is_fuchsia
   shell_enable_metal = false
 
-  # TODO(dworsham): Enable once Fuchsia supports Vulkan through the embedder.
-  shell_enable_vulkan = false
+  shell_enable_vulkan = true
   shell_enable_software = true
 }
 
 declare_args() {
   test_enable_gl = shell_enable_gl
   test_enable_metal = shell_enable_metal
-  test_enable_vulkan = is_fuchsia
+  test_enable_vulkan = shell_enable_vulkan
   test_enable_software = shell_enable_software
 }

shell/gpu/gpu_surface_vulkan.cc

@@ -10,23 +10,17 @@ namespace flutter {
 
 GPUSurfaceVulkan::GPUSurfaceVulkan(
     GPUSurfaceVulkanDelegate* delegate,
-    std::unique_ptr<vulkan::VulkanNativeSurface> native_surface,
-    bool render_to_surface)
+    std::unique_ptr<vulkan::VulkanNativeSurface> native_surface)
     : GPUSurfaceVulkan(/*context=*/nullptr,
                        delegate,
-                       std::move(native_surface),
-                       render_to_surface) {}
+                       std::move(native_surface)) {}
 
 GPUSurfaceVulkan::GPUSurfaceVulkan(
     const sk_sp<GrDirectContext>& context,
     GPUSurfaceVulkanDelegate* delegate,
-    std::unique_ptr<vulkan::VulkanNativeSurface> native_surface,
-    bool render_to_surface)
-    : window_(context,
-              delegate->vk(),
-              std::move(native_surface),
-              render_to_surface),
-      render_to_surface_(render_to_surface),
+    std::unique_ptr<vulkan::VulkanNativeSurface> native_surface)
+    : window_(context, delegate->vk(), std::move(native_surface)),
+      render_to_surface_(native_surface),
       weak_factory_(this) {}
 
 GPUSurfaceVulkan::~GPUSurfaceVulkan() = default;

shell/gpu/gpu_surface_vulkan.h

@@ -24,17 +24,15 @@ class GPUSurfaceVulkan : public Surface {
   ///             GrDirectContext for Skia.
   ///
   GPUSurfaceVulkan(GPUSurfaceVulkanDelegate* delegate,
-                   std::unique_ptr<vulkan::VulkanNativeSurface> native_surface,
-                   bool render_to_surface);
+                   std::unique_ptr<vulkan::VulkanNativeSurface> native_surface);
 
   //------------------------------------------------------------------------------
   /// @brief      Create a GPUSurfaceVulkan while letting it reuse an existing
   ///             GrDirectContext.
   ///
   GPUSurfaceVulkan(const sk_sp<GrDirectContext>& context,
                    GPUSurfaceVulkanDelegate* delegate,
-                   std::unique_ptr<vulkan::VulkanNativeSurface> native_surface,
-                   bool render_to_surface);
+                   std::unique_ptr<vulkan::VulkanNativeSurface> native_surface);
 
   ~GPUSurfaceVulkan() override;
 

shell/platform/android/context/BUILD.gn

@@ -14,6 +14,7 @@ source_set("context") {
 
   deps = [
     "//flutter/fml",
+    "//flutter/vulkan", # TODO(bdero)
     "//third_party/skia",
   ]
 }

shell/platform/android/surface/BUILD.gn

@@ -50,6 +50,7 @@ source_set("surface_mock") {
   deps = [
     ":surface",
     "//flutter/shell/gpu:gpu_surface_gl",
+    "//flutter/vulkan", # TODO(bdero)
     "//third_party/googletest:gmock",
     "//third_party/googletest:gtest",
     "//third_party/skia",

shell/platform/embedder/BUILD.gn

@@ -228,7 +228,9 @@ if (enable_unittests) {
         "tests/embedder_unittests_gl.cc",
       ]
 
-      deps += [ "//flutter/testing:opengl" ]
+      deps += [
+        "//flutter/testing:opengl",
+      ]
     }
 
     if (test_enable_metal) {
@@ -242,6 +244,18 @@ if (enable_unittests) {
 
       deps += [ "//flutter/testing:metal" ]
     }
+
+    if (test_enable_vulkan) {
+      sources += [
+        "tests/embedder_test_context_vulkan.cc",
+        "tests/embedder_test_context_vulkan.h",
+      ]
+
+      deps += [
+        "//flutter/testing:vulkan",
+        "//flutter/vulkan",
+      ]
+    }
   }
 
   # Tests the build in FLUTTER_ENGINE_NO_PROTOTYPES mode.

shell/platform/embedder/embedder.cc

@@ -604,6 +604,14 @@ static sk_sp<SkSurface> MakeSkSurfaceFromBackingStore(
 #endif
 }
 
+static sk_sp<SkSurface> MakeSkSurfaceFromBackingStore(
+    GrDirectContext* context,
+    const FlutterBackingStoreConfig& config,
+    const FlutterVulkanBackingStore* vulkan) {
+  assert(false); // TODO(bdero)
+  return nullptr;
+}
+
 static std::unique_ptr<flutter::EmbedderRenderTarget>
 CreateEmbedderRenderTarget(const FlutterCompositor* compositor,
                            const FlutterBackingStoreConfig& config,
@@ -665,6 +673,11 @@ CreateEmbedderRenderTarget(const FlutterCompositor* compositor,
       render_surface =
           MakeSkSurfaceFromBackingStore(context, config, &backing_store.metal);
       break;
+
+    case kFlutterBackingStoreTypeVulkan:
+      render_surface =
+          MakeSkSurfaceFromBackingStore(context, config, &backing_store.vulkan);
+      break;
   };
 
   if (!render_surface) {

shell/platform/embedder/embedder.h

@@ -76,6 +76,7 @@ typedef enum {
   /// iOS version >= 10.0 (device), 13.0 (simulator)
   /// macOS version >= 10.14
   kMetal,
+  kVulkan,
 } FlutterRendererType;
 
 /// Additional accessibility features that may be enabled by the platform.
@@ -541,6 +542,33 @@ typedef struct {
   FlutterMetalTextureFrameCallback external_texture_frame_callback;
 } FlutterMetalRendererConfig;
 
+typedef uintptr_t* (*FlutterVulkanGetNextImageCallback)(void* /* user data */);
+
+typedef void* (*ProcAddressCallback)(void* user /* in */,
+                                     const char* pName /* in */);
+typedef void* (*InstanceProcAddressCallback)(void* user /* in */,
+                                             uintptr_t* instance /* in */,
+                                             const char* pName /* in */);
+typedef uintptr_t* (*UintPtrCallback)(void* user /* in */);
+
+typedef struct {
+  /// The size of this struct. Must be sizeof(FlutterVulkanRendererConfig).
+  size_t struct_size;
+
+  void* user_data;
+
+  /// Platform Callbacks
+  ProcAddressCallback get_proc_address_callback;
+  InstanceProcAddressCallback get_instance_proc_address_callback;
+  UintPtrCallback get_instance_handle_callback;
+  UintPtrCallback get_physical_device_handle_callback;
+  UintPtrCallback get_device_handle_callback;
+
+  FlutterVulkanGetNextImageCallback acquire_next_image_callback;
+  VoidCallback terminate_callback;
+
+} FlutterVulkanRendererConfig;
+
 typedef struct {
   /// The size of this struct. Must be sizeof(FlutterSoftwareRendererConfig).
   size_t struct_size;
@@ -557,6 +585,7 @@ typedef struct {
     FlutterOpenGLRendererConfig open_gl;
     FlutterSoftwareRendererConfig software;
     FlutterMetalRendererConfig metal;
+    FlutterVulkanRendererConfig vulkan;
   };
 } FlutterRendererConfig;
 
@@ -989,6 +1018,17 @@ typedef struct {
   };
 } FlutterMetalBackingStore;
 
+typedef struct {
+  /// The size of this struct. Must be sizeof(FlutterVulkanBackingStore).
+  size_t struct_size;
+
+  /// VkImage handle.
+  uint64_t handle;
+
+  /// VkSemaphore signaled when engine is done writing image.
+  uint64_t image_ready;
+} FlutterVulkanBackingStore;
+
 typedef enum {
   /// Indicates that the Flutter application requested that an opacity be
   /// applied to the platform view.
@@ -1048,6 +1088,8 @@ typedef enum {
   kFlutterBackingStoreTypeSoftware,
   /// Specifies a Metal backing store. This is backed by a Metal texture.
   kFlutterBackingStoreTypeMetal,
+  /// Specifies a Vulkan backing store. This is backed by a Vulkan VkImage.
+  kFlutterBackingStoreTypeVulkan,
 } FlutterBackingStoreType;
 
 typedef struct {
@@ -1069,6 +1111,8 @@ typedef struct {
     FlutterSoftwareBackingStore software;
     // The description of the Metal backing store.
     FlutterMetalBackingStore metal;
+    // The description of the Vulkan backing store.
+    FlutterVulkanBackingStore vulkan;
   };
 } FlutterBackingStore;
 

shell/platform/embedder/tests/embedder_assertions.h

@@ -70,6 +70,11 @@ inline bool operator==(const FlutterMetalTexture& a,
   return a.texture_id == b.texture_id && a.texture == b.texture;
 }
 
+inline bool operator==(const FlutterVulkanBackingStore& a,
+                       const FlutterVulkanBackingStore& b) {
+  return a.handle == b.handle && a.image_ready == b.image_ready;
+}
+
 inline bool operator==(const FlutterMetalBackingStore& a,
                        const FlutterMetalBackingStore& b) {
   return a.texture == b.texture;
@@ -112,6 +117,8 @@ inline bool operator==(const FlutterBackingStore& a,
       return a.software == b.software;
     case kFlutterBackingStoreTypeMetal:
       return a.metal == b.metal;
+    case kFlutterBackingStoreTypeVulkan:
+      return a.vulkan == b.vulkan;
   }
 
   return false;
@@ -230,6 +237,8 @@ inline std::string FlutterBackingStoreTypeToString(
       return "kFlutterBackingStoreTypeSoftware";
     case kFlutterBackingStoreTypeMetal:
       return "kFlutterBackingStoreTypeMetal";
+    case kFlutterBackingStoreTypeVulkan:
+      return "kFlutterBackingStoreTypeVulkan";
   }
   return "Unknown";
 }
@@ -347,6 +356,12 @@ inline std::ostream& operator<<(std::ostream& out,
   return out << "(FlutterMetalBackingStore) Texture: " << item.texture;
 }
 
+inline std::ostream& operator<<(std::ostream& out,
+                                const FlutterVulkanBackingStore& item) {
+  return out << "(FlutterVulkanBackingStore) Handle: " << item.handle
+             << "Image Ready Semaphore: " << item.image_ready;
+}
+
 inline std::ostream& operator<<(std::ostream& out,
                                 const FlutterBackingStore& backing_store) {
   out << "(FlutterBackingStore) Struct size: " << backing_store.struct_size
@@ -366,6 +381,10 @@ inline std::ostream& operator<<(std::ostream& out,
     case kFlutterBackingStoreTypeMetal:
       out << backing_store.metal;
       break;
+
+    case kFlutterBackingStoreTypeVulkan:
+      out << backing_store.vulkan;
+      break;
   }
 
   return out;

shell/platform/embedder/tests/embedder_test.cc

@@ -4,6 +4,7 @@
 
 #include "flutter/shell/platform/embedder/tests/embedder_test.h"
 #include "flutter/shell/platform/embedder/tests/embedder_test_context_software.h"
+#include "flutter/shell/platform/embedder/tests/embedder_test_context_vulkan.h"
 
 #ifdef SHELL_ENABLE_GL
 #include "flutter/shell/platform/embedder/tests/embedder_test_context_gl.h"
@@ -33,6 +34,11 @@ EmbedderTestContext& EmbedderTest::GetEmbedderContext(
             std::make_unique<EmbedderTestContextSoftware>(
                 GetFixturesDirectory());
         break;
+      case EmbedderTestContextType::kVulkanContext:
+        embedder_contexts_[type] =
+            std::make_unique<EmbedderTestContextVulkan>(
+                GetFixturesDirectory());
+        break;
 #ifdef SHELL_ENABLE_GL
       case EmbedderTestContextType::kOpenGLContext:
         embedder_contexts_[type] =