[Impeller] Implement OpenGL to Vulkan texture trampolining.

ci/licenses_golden/excluded_files

@@ -214,6 +214,7 @@
 ../../../flutter/impeller/tessellator/tessellator_unittests.cc
 ../../../flutter/impeller/toolkit/android/README.md
 ../../../flutter/impeller/toolkit/android/toolkit_android_unittests.cc
+../../../flutter/impeller/toolkit/glvk/README.md
 ../../../flutter/impeller/tools/malioc_cores.py
 ../../../flutter/impeller/tools/malioc_diff.py
 ../../../flutter/impeller/tools/metal_library.py

ci/licenses_golden/licenses_flutter

@@ -42612,6 +42612,10 @@ ORIGIN: ../../../flutter/impeller/toolkit/egl/surface.cc + ../../../flutter/LICE
 ORIGIN: ../../../flutter/impeller/toolkit/egl/surface.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/toolkit/gles/gles.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/toolkit/gles/texture.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/toolkit/glvk/proc_table.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/toolkit/glvk/proc_table.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/toolkit/glvk/trampoline.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/toolkit/glvk/trampoline.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/typographer/backends/skia/typeface_skia.cc + ../../../flutter/LICENSE
@@ -43502,6 +43506,8 @@ ORIGIN: ../../../flutter/shell/platform/android/surface_texture_external_texture
 ORIGIN: ../../../flutter/shell/platform/android/surface_texture_external_texture_gl_impeller.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/android/surface_texture_external_texture_gl_skia.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/android/surface_texture_external_texture_gl_skia.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/shell/platform/android/surface_texture_external_texture_vk_impeller.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/shell/platform/android/surface_texture_external_texture_vk_impeller.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/android/vsync_waiter_android.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/android/vsync_waiter_android.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/common/accessibility_bridge.cc + ../../../flutter/LICENSE
@@ -45488,6 +45494,10 @@ FILE: ../../../flutter/impeller/toolkit/egl/surface.h
 FILE: ../../../flutter/impeller/toolkit/gles/gles.h
 FILE: ../../../flutter/impeller/toolkit/gles/texture.cc
 FILE: ../../../flutter/impeller/toolkit/gles/texture.h
+FILE: ../../../flutter/impeller/toolkit/glvk/proc_table.cc
+FILE: ../../../flutter/impeller/toolkit/glvk/proc_table.h
+FILE: ../../../flutter/impeller/toolkit/glvk/trampoline.cc
+FILE: ../../../flutter/impeller/toolkit/glvk/trampoline.h
 FILE: ../../../flutter/impeller/tools/malioc.json
 FILE: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.cc
 FILE: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.h
@@ -46392,6 +46402,8 @@ FILE: ../../../flutter/shell/platform/android/surface_texture_external_texture_g
 FILE: ../../../flutter/shell/platform/android/surface_texture_external_texture_gl_impeller.h
 FILE: ../../../flutter/shell/platform/android/surface_texture_external_texture_gl_skia.cc
 FILE: ../../../flutter/shell/platform/android/surface_texture_external_texture_gl_skia.h
+FILE: ../../../flutter/shell/platform/android/surface_texture_external_texture_vk_impeller.cc
+FILE: ../../../flutter/shell/platform/android/surface_texture_external_texture_vk_impeller.h
 FILE: ../../../flutter/shell/platform/android/vsync_waiter_android.cc
 FILE: ../../../flutter/shell/platform/android/vsync_waiter_android.h
 FILE: ../../../flutter/shell/platform/common/accessibility_bridge.cc

impeller/toolkit/egl/context.cc

@@ -99,5 +99,9 @@ void Context::DispatchLifecyleEvent(LifecycleEvent event) const {
   }
 }
 
+bool Context::IsCurrent() const {
+  return ::eglGetCurrentContext() == context_;
+}
+
 }  // namespace egl
 }  // namespace impeller

impeller/toolkit/egl/context.h

@@ -99,6 +99,12 @@ class Context {
   ///
   bool RemoveLifecycleListener(UniqueID id);
 
+  //----------------------------------------------------------------------------
+  /// @return     True if the context is current and attached to any surface,
+  ///             False otherwise.
+  ///
+  bool IsCurrent() const;
+
  private:
   friend class Display;
 

impeller/toolkit/egl/display.cc

@@ -206,5 +206,9 @@ std::unique_ptr<Surface> Display::CreatePixelBufferSurface(const Config& config,
   return std::unique_ptr<Surface>(new Surface(display_, surface));
 }
 
+const EGLDisplay& Display::GetHandle() const {
+  return display_;
+}
+
 }  // namespace egl
 }  // namespace impeller

impeller/toolkit/egl/display.h

@@ -96,6 +96,8 @@ class Display {
   virtual std::unique_ptr<Surface>
   CreatePixelBufferSurface(const Config& config, size_t width, size_t height);
 
+  const EGLDisplay& GetHandle() const;
+
  private:
   EGLDisplay display_ = EGL_NO_DISPLAY;
 

impeller/toolkit/glvk/BUILD.gn

@@ -0,0 +1,23 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("../../tools/impeller.gni")
+
+impeller_component("glvk") {
+  sources = [
+    "proc_table.cc",
+    "proc_table.h",
+    "trampoline.cc",
+    "trampoline.h",
+  ]
+
+  public_deps = [
+    "../../renderer",
+    "../../renderer/backend/gles",
+    "../../renderer/backend/vulkan",
+    "../../toolkit/egl",
+    "../../toolkit/gles",
+    "//flutter/fml",
+  ]
+}

impeller/toolkit/glvk/README.md

@@ -0,0 +1,3 @@
+# GLVK Toolkit
+
+A toolkit for inter-operating between OpenGL and Vulkan.

impeller/toolkit/glvk/proc_table.cc

@@ -0,0 +1,45 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "impeller/toolkit/glvk/proc_table.h"
+
+#include "impeller/base/validation.h"
+
+namespace impeller::glvk {
+
+ProcTable::ProcTable(const Resolver& resolver) {
+  if (!resolver) {
+    return;
+  }
+
+  auto error_fn = reinterpret_cast<PFNGLGETERRORPROC>(resolver("glGetError"));
+  if (!error_fn) {
+    VALIDATION_LOG << "Could not resolve " << "glGetError";
+    return;
+  }
+
+#define GLVK_PROC(proc_ivar)                                    \
+  if (auto fn_ptr = resolver(proc_ivar.name)) {                 \
+    proc_ivar.function =                                        \
+        reinterpret_cast<decltype(proc_ivar.function)>(fn_ptr); \
+    proc_ivar.error_fn = error_fn;                              \
+  } else {                                                      \
+    VALIDATION_LOG << "Could not resolve " << proc_ivar.name;   \
+    return;                                                     \
+  }
+
+  FOR_EACH_GLVK_PROC(GLVK_PROC);
+
+#undef GLVK_PROC
+
+  is_valid_ = true;
+}
+
+ProcTable::~ProcTable() = default;
+
+bool ProcTable::IsValid() const {
+  return is_valid_;
+}
+
+}  // namespace impeller::glvk

impeller/toolkit/glvk/proc_table.h

@@ -0,0 +1,102 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef FLUTTER_IMPELLER_TOOLKIT_GLVK_PROC_TABLE_H_
+#define FLUTTER_IMPELLER_TOOLKIT_GLVK_PROC_TABLE_H_
+
+#include "impeller/renderer/backend/gles/proc_table_gles.h"
+#include "impeller/toolkit/gles/gles.h"
+
+namespace impeller::glvk {
+
+#define FOR_EACH_GLVK_PROC(PROC)   \
+  PROC(ActiveTexture)              \
+  PROC(AttachShader)               \
+  PROC(BindAttribLocation)         \
+  PROC(BindBuffer)                 \
+  PROC(BindFramebuffer)            \
+  PROC(BindTexture)                \
+  PROC(BufferData)                 \
+  PROC(CheckFramebufferStatus)     \
+  PROC(Clear)                      \
+  PROC(ClearColor)                 \
+  PROC(ColorMask)                  \
+  PROC(CompileShader)              \
+  PROC(CreateProgram)              \
+  PROC(CreateShader)               \
+  PROC(DeleteBuffers)              \
+  PROC(DeleteFramebuffers)         \
+  PROC(DeleteProgram)              \
+  PROC(DeleteShader)               \
+  PROC(DeleteTextures)             \
+  PROC(Disable)                    \
+  PROC(DrawArrays)                 \
+  PROC(EGLImageTargetTexture2DOES) \
+  PROC(Enable)                     \
+  PROC(EnableVertexAttribArray)    \
+  PROC(Flush)                      \
+  PROC(FramebufferTexture2D)       \
+  PROC(GenBuffers)                 \
+  PROC(GenFramebuffers)            \
+  PROC(GenTextures)                \
+  PROC(GetProgramiv)               \
+  PROC(GetShaderiv)                \
+  PROC(GetUniformLocation)         \
+  PROC(LinkProgram)                \
+  PROC(ShaderSource)               \
+  PROC(TexParameteri)              \
+  PROC(Uniform1i)                  \
+  PROC(UniformMatrix4fv)           \
+  PROC(UseProgram)                 \
+  PROC(VertexAttribPointer)        \
+  PROC(Viewport)
+
+//------------------------------------------------------------------------------
+/// @brief      A proc. table consisting of methods that are useful when
+///             interoperating between OpenGL and Vulkan. This is different from
+///             the OpenGL proc. table since it may contain more interop
+///             extension related methods.
+///
+class ProcTable {
+ public:
+  using Resolver = std::function<void*(const char* function_name)>;
+
+  //----------------------------------------------------------------------------
+  /// @brief      Create a proc table using a resolver to resolve OpenGL
+  ///             methods.
+  ///
+  /// @param[in]  resolver  The resolver
+  ///
+  explicit ProcTable(const Resolver& resolver);
+
+  ~ProcTable();
+
+  ProcTable(const ProcTable&) = delete;
+
+  ProcTable& operator=(const ProcTable&) = delete;
+
+  //----------------------------------------------------------------------------
+  /// @brief      Determines if a proc. table is suitable for interop purposes.
+  ///             The absence of optional extension methods that have fallbacks
+  ///             don't result in an invalid proc. table. But an invalid proc
+  ///             table must always be discarded as there can be no error
+  ///             recovery.
+  ///
+  /// @return     True if valid, False otherwise.
+  ///
+  bool IsValid() const;
+
+#define GLVK_PROC(name) GLProc<decltype(gl##name)> name = {"gl" #name, nullptr};
+
+  FOR_EACH_GLVK_PROC(GLVK_PROC);
+
+#undef GLVK_PROC
+
+ private:
+  bool is_valid_ = false;
+};
+
+}  // namespace impeller::glvk
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_GLVK_PROC_TABLE_H_