[Tizen] Support EmbedderExternalTextureGL for impeller

Author: JSUYA

engine/src/flutter/shell/platform/embedder/embedder.h

@@ -302,6 +302,7 @@ typedef struct {
 } FlutterTransformation;
 
 typedef void (*VoidCallback)(void* /* user data */);
+typedef bool (*BoolCallback)(void* /* user data */);
 
 typedef enum {
   /// Specifies an OpenGL texture target type. Textures are specified using
@@ -409,6 +410,13 @@ typedef struct {
   uint32_t name;
   /// The texture format (example GL_RGBA8).
   uint32_t format;
+  /// The pixel data buffer.
+  const uint8_t* buffer;
+  /// The size of pixel buffer.
+  size_t buffer_size;
+  /// Callback invoked that the gpu surface texture start binding.
+  BoolCallback bind_callback;
+
   /// User data to be returned on the invocation of the destruction callback.
   void* user_data;
   /// Callback invoked (on an engine managed thread) that asks the embedder to
@@ -502,7 +510,6 @@ typedef struct {
   uint32_t format;
 } FlutterOpenGLSurface;
 
-typedef bool (*BoolCallback)(void* /* user data */);
 typedef FlutterTransformation (*TransformationCallback)(void* /* user data */);
 typedef uint32_t (*UIntCallback)(void* /* user data */);
 typedef bool (*SoftwareSurfacePresentCallback)(void* /* user data */,

engine/src/flutter/shell/platform/embedder/embedder_external_texture_gl.cc

@@ -140,6 +140,10 @@ sk_sp<DlImage> EmbedderExternalTextureGL::ResolveTextureImpeller(
   }
 
   impeller::TextureDescriptor desc;
+  desc.type = impeller::TextureType::kTextureExternalOES;
+  desc.storage_mode = impeller::StorageMode::kDevicePrivate;
+  desc.format = impeller::PixelFormat::kR8G8B8A8UNormInt;
+  desc.mip_count = 1;
   desc.size = impeller::ISize(texture->width, texture->height);
 
   impeller::ContextGLES& context =
@@ -148,6 +152,9 @@ sk_sp<DlImage> EmbedderExternalTextureGL::ResolveTextureImpeller(
       impeller::HandleType::kTexture, texture->target);
   std::shared_ptr<impeller::TextureGLES> image =
       impeller::TextureGLES::WrapTexture(context.GetReactor(), desc, handle);
+  image->MarkContentsInitialized();
+  image->SetCoordinateSystem(
+      impeller::TextureCoordinateSystem::kUploadFromHost);
 
   if (!image) {
     // In case Skia rejects the image, call the release proc so that
@@ -158,6 +165,14 @@ sk_sp<DlImage> EmbedderExternalTextureGL::ResolveTextureImpeller(
     FML_LOG(ERROR) << "Could not create external texture";
     return nullptr;
   }
+
+  if (!texture->bind_callback(texture->user_data)) {
+    if (texture->destruction_callback) {
+      texture->destruction_callback(texture->user_data);
+    }
+    return nullptr;
+  }
+
   if (texture->destruction_callback &&
       !context.GetReactor()->RegisterCleanupCallback(
           handle,