Linux texture support

ci/licenses_golden/licenses_flutter

@@ -1571,6 +1571,9 @@ FILE: ../../../flutter/shell/platform/linux/fl_method_response.cc
 FILE: ../../../flutter/shell/platform/linux/fl_method_response_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_mouse_cursor_plugin.cc
 FILE: ../../../flutter/shell/platform/linux/fl_mouse_cursor_plugin.h
+FILE: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture.cc
+FILE: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture_private.h
+FILE: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_platform_plugin.cc
 FILE: ../../../flutter/shell/platform/linux/fl_platform_plugin.h
 FILE: ../../../flutter/shell/platform/linux/fl_plugin_registrar.cc
@@ -1595,6 +1598,14 @@ FILE: ../../../flutter/shell/platform/linux/fl_task_runner.cc
 FILE: ../../../flutter/shell/platform/linux/fl_task_runner.h
 FILE: ../../../flutter/shell/platform/linux/fl_text_input_plugin.cc
 FILE: ../../../flutter/shell/platform/linux/fl_text_input_plugin.h
+FILE: ../../../flutter/shell/platform/linux/fl_texture.cc
+FILE: ../../../flutter/shell/platform/linux/fl_texture_gl.cc
+FILE: ../../../flutter/shell/platform/linux/fl_texture_gl_private.h
+FILE: ../../../flutter/shell/platform/linux/fl_texture_gl_test.cc
+FILE: ../../../flutter/shell/platform/linux/fl_texture_private.h
+FILE: ../../../flutter/shell/platform/linux/fl_texture_registrar.cc
+FILE: ../../../flutter/shell/platform/linux/fl_texture_registrar_private.h
+FILE: ../../../flutter/shell/platform/linux/fl_texture_registrar_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_value.cc
 FILE: ../../../flutter/shell/platform/linux/fl_value_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_view.cc
@@ -1616,11 +1627,15 @@ FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_method_call.
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_method_channel.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_method_codec.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_method_response.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_pixel_buffer_texture.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_plugin_registrar.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_plugin_registry.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_standard_message_codec.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_standard_method_codec.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_string_codec.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_texture.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_texture_gl.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_texture_registrar.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_value.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_view.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/flutter_linux.h

shell/platform/linux/BUILD.gn

@@ -55,11 +55,15 @@ _public_headers = [
   "public/flutter_linux/fl_method_channel.h",
   "public/flutter_linux/fl_method_codec.h",
   "public/flutter_linux/fl_method_response.h",
+  "public/flutter_linux/fl_pixel_buffer_texture.h",
   "public/flutter_linux/fl_plugin_registrar.h",
   "public/flutter_linux/fl_plugin_registry.h",
   "public/flutter_linux/fl_standard_message_codec.h",
   "public/flutter_linux/fl_standard_method_codec.h",
   "public/flutter_linux/fl_string_codec.h",
+  "public/flutter_linux/fl_texture.h",
+  "public/flutter_linux/fl_texture_gl.h",
+  "public/flutter_linux/fl_texture_registrar.h",
   "public/flutter_linux/fl_value.h",
   "public/flutter_linux/fl_view.h",
   "public/flutter_linux/flutter_linux.h",
@@ -114,6 +118,7 @@ source_set("flutter_linux_sources") {
     "fl_method_codec.cc",
     "fl_method_response.cc",
     "fl_mouse_cursor_plugin.cc",
+    "fl_pixel_buffer_texture.cc",
     "fl_platform_plugin.cc",
     "fl_plugin_registrar.cc",
     "fl_plugin_registry.cc",
@@ -127,6 +132,9 @@ source_set("flutter_linux_sources") {
     "fl_task_runner.cc",
     "fl_task_runner.h",
     "fl_text_input_plugin.cc",
+    "fl_texture.cc",
+    "fl_texture_gl.cc",
+    "fl_texture_registrar.cc",
     "fl_value.cc",
     "fl_view.cc",
     "fl_view_accessible.cc",
@@ -184,9 +192,12 @@ executable("flutter_linux_unittests") {
     "fl_method_channel_test.cc",
     "fl_method_codec_test.cc",
     "fl_method_response_test.cc",
+    "fl_pixel_buffer_texture_test.cc",
     "fl_standard_message_codec_test.cc",
     "fl_standard_method_codec_test.cc",
     "fl_string_codec_test.cc",
+    "fl_texture_gl_test.cc",
+    "fl_texture_registrar_test.cc",
     "fl_value_test.cc",
     "testing/fl_test.cc",
     "testing/mock_engine.cc",

shell/platform/linux/fl_engine.cc

@@ -8,13 +8,15 @@
 
 #include <cstring>
 
+#include "flutter/shell/platform/embedder/embedder.h"
 #include "flutter/shell/platform/linux/fl_binary_messenger_private.h"
 #include "flutter/shell/platform/linux/fl_dart_project_private.h"
 #include "flutter/shell/platform/linux/fl_engine_private.h"
 #include "flutter/shell/platform/linux/fl_plugin_registrar_private.h"
 #include "flutter/shell/platform/linux/fl_renderer.h"
 #include "flutter/shell/platform/linux/fl_renderer_headless.h"
 #include "flutter/shell/platform/linux/fl_settings_plugin.h"
+#include "flutter/shell/platform/linux/fl_texture_registrar_private.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_plugin_registry.h"
 
 // Unique number associated with platform tasks.
@@ -30,6 +32,7 @@ struct _FlEngine {
   FlRenderer* renderer;
   FlBinaryMessenger* binary_messenger;
   FlSettingsPlugin* settings_plugin;
+  FlTextureRegistrar* texture_registrar;
   FlTaskRunner* task_runner;
   FlutterEngineAOTData aot_data;
   FLUTTER_API_SYMBOL(FlutterEngine) engine;
@@ -214,6 +217,26 @@ static bool fl_engine_gl_make_resource_current(void* user_data) {
   return result;
 }
 
+// Called by the engine to retrieve an external texture.
+static bool fl_engine_gl_external_texture_frame_callback(
+    void* user_data,
+    int64_t texture_id,
+    size_t width,
+    size_t height,
+    FlutterOpenGLTexture* texture) {
+  FlEngine* self = static_cast<FlEngine*>(user_data);
+  if (!self->texture_registrar) {
+    return false;
+  }
+  g_autoptr(GError) error = nullptr;
+  gboolean result = fl_texture_registrar_populate_gl_external_texture(
+      self->texture_registrar, texture_id, width, height, texture, &error);
+  if (!result) {
+    g_warning("%s", error->message);
+  }
+  return result;
+}
+
 // Called by the engine to determine if it is on the GTK thread.
 static bool fl_engine_runs_task_on_current_thread(void* user_data) {
   FlEngine* self = static_cast<FlEngine*>(user_data);
@@ -276,7 +299,8 @@ static FlPluginRegistrar* fl_engine_get_registrar_for_plugin(
     const gchar* name) {
   FlEngine* self = FL_ENGINE(registry);
 
-  return fl_plugin_registrar_new(nullptr, self->binary_messenger);
+  return fl_plugin_registrar_new(nullptr, self->binary_messenger,
+                                 self->texture_registrar);
 }
 
 static void fl_engine_plugin_registry_iface_init(
@@ -299,6 +323,7 @@ static void fl_engine_dispose(GObject* object) {
 
   g_clear_object(&self->project);
   g_clear_object(&self->renderer);
+  g_clear_object(&self->texture_registrar);
   g_clear_object(&self->binary_messenger);
   g_clear_object(&self->settings_plugin);
   g_clear_object(&self->task_runner);
@@ -330,6 +355,7 @@ static void fl_engine_init(FlEngine* self) {
   self->embedder_api.struct_size = sizeof(FlutterEngineProcTable);
   FlutterEngineGetProcAddresses(&self->embedder_api);
 
+  self->texture_registrar = fl_texture_registrar_new(self);
   self->binary_messenger = fl_binary_messenger_new(self);
 }
 
@@ -362,6 +388,8 @@ gboolean fl_engine_start(FlEngine* self, GError** error) {
   config.open_gl.fbo_callback = fl_engine_gl_get_fbo;
   config.open_gl.present = fl_engine_gl_present;
   config.open_gl.make_resource_current = fl_engine_gl_make_resource_current;
+  config.open_gl.gl_external_texture_frame_callback =
+      fl_engine_gl_external_texture_frame_callback;
 
   FlutterTaskRunnerDescription platform_task_runner = {};
   platform_task_runner.struct_size = sizeof(FlutterTaskRunnerDescription);
@@ -673,6 +701,27 @@ void fl_engine_dispatch_semantics_action(FlEngine* self,
                                              action_data, action_data_length);
 }
 
+gboolean fl_engine_mark_texture_frame_available(FlEngine* self,
+                                                int64_t texture_id) {
+  g_return_val_if_fail(FL_IS_ENGINE(self), FALSE);
+  return self->embedder_api.MarkExternalTextureFrameAvailable(
+             self->engine, texture_id) == kSuccess;
+}
+
+gboolean fl_engine_register_external_texture(FlEngine* self,
+                                             int64_t texture_id) {
+  g_return_val_if_fail(FL_IS_ENGINE(self), FALSE);
+  return self->embedder_api.RegisterExternalTexture(self->engine, texture_id) ==
+         kSuccess;
+}
+
+gboolean fl_engine_unregister_external_texture(FlEngine* self,
+                                               int64_t texture_id) {
+  g_return_val_if_fail(FL_IS_ENGINE(self), FALSE);
+  return self->embedder_api.UnregisterExternalTexture(self->engine,
+                                                      texture_id) == kSuccess;
+}
+
 G_MODULE_EXPORT FlBinaryMessenger* fl_engine_get_binary_messenger(
     FlEngine* self) {
   g_return_val_if_fail(FL_IS_ENGINE(self), nullptr);
@@ -688,3 +737,9 @@ void fl_engine_execute_task(FlEngine* self, FlutterTask* task) {
   g_return_if_fail(FL_IS_ENGINE(self));
   self->embedder_api.RunTask(self->engine, task);
 }
+
+G_MODULE_EXPORT FlTextureRegistrar* fl_engine_get_texture_registrar(
+    FlEngine* self) {
+  g_return_val_if_fail(FL_IS_ENGINE(self), nullptr);
+  return self->texture_registrar;
+}

shell/platform/linux/fl_engine_private.h

@@ -253,6 +253,44 @@ FlTaskRunner* fl_engine_get_task_runner(FlEngine* engine);
  */
 void fl_engine_execute_task(FlEngine* engine, FlutterTask* task);
 
+/**
+ * fl_engine_mark_texture_frame_available:
+ * @engine: an #FlEngine.
+ * @texture_id: the identifier of the texture whose frame has been updated.
+ *
+ * Tells the Flutter engine that a new texture frame is available for the given
+ * texture.
+ *
+ * Returns: %TRUE on success.
+ */
+gboolean fl_engine_mark_texture_frame_available(FlEngine* engine,
+                                                int64_t texture_id);
+
+/**
+ * fl_engine_register_external_texture:
+ * @engine: an #FlEngine.
+ * @texture_id: the identifier of the texture that is available.
+ *
+ * Tells the Flutter engine that a new external texture is available.
+ *
+ * Returns: %TRUE on success.
+ */
+gboolean fl_engine_register_external_texture(FlEngine* engine,
+                                             int64_t texture_id);
+
+/**
+ * fl_engine_unregister_external_texture:
+ * @engine: an #FlEngine.
+ * @texture_id: the identifier of the texture that is not available anymore.
+ *
+ * Tells the Flutter engine that an existing external texture is not available
+ * anymore.
+ *
+ * Returns: %TRUE on success.
+ */
+gboolean fl_engine_unregister_external_texture(FlEngine* engine,
+                                               int64_t texture_id);
+
 G_END_DECLS
 
 #endif  // FLUTTER_SHELL_PLATFORM_LINUX_FL_ENGINE_PRIVATE_H_

shell/platform/linux/fl_pixel_buffer_texture.cc

@@ -0,0 +1,103 @@
+// 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 "flutter/shell/platform/linux/public/flutter_linux/fl_pixel_buffer_texture.h"
+
+#include <epoxy/gl.h>
+#include <gmodule.h>
+
+#include "flutter/shell/platform/linux/fl_pixel_buffer_texture_private.h"
+
+typedef struct {
+  GLuint texture_id;
+} FlPixelBufferTexturePrivate;
+
+// Added here to stop the compiler from optimising this function away.
+G_MODULE_EXPORT GType fl_pixel_buffer_texture_get_type();
+
+static void fl_pixel_buffer_texture_iface_init(FlTextureInterface* iface) {}
+
+G_DEFINE_TYPE_WITH_CODE(
+    FlPixelBufferTexture,
+    fl_pixel_buffer_texture,
+    G_TYPE_OBJECT,
+    G_IMPLEMENT_INTERFACE(fl_texture_get_type(),
+                          fl_pixel_buffer_texture_iface_init);
+    G_ADD_PRIVATE(FlPixelBufferTexture))
+
+static void fl_pixel_buffer_texture_dispose(GObject* object) {
+  FlPixelBufferTexture* self = FL_PIXEL_BUFFER_TEXTURE(object);
+  FlPixelBufferTexturePrivate* priv =
+      reinterpret_cast<FlPixelBufferTexturePrivate*>(
+          fl_pixel_buffer_texture_get_instance_private(self));
+
+  if (priv->texture_id) {
+    glDeleteTextures(1, &priv->texture_id);
+    priv->texture_id = 0;
+  }
+
+  G_OBJECT_CLASS(fl_pixel_buffer_texture_parent_class)->dispose(object);
+}
+
+static void check_gl_error(int line) {
+  GLenum err = glGetError();
+  if (err) {
+    g_warning("glGetError %x (%s:%d)\n", err, __FILE__, line);
+  }
+}
+
+gboolean fl_pixel_buffer_texture_populate(FlPixelBufferTexture* texture,
+                                          uint32_t width,
+                                          uint32_t height,
+                                          FlutterOpenGLTexture* opengl_texture,
+                                          GError** error) {
+  FlPixelBufferTexture* self = FL_PIXEL_BUFFER_TEXTURE(texture);
+  FlPixelBufferTexturePrivate* priv =
+      reinterpret_cast<FlPixelBufferTexturePrivate*>(
+          fl_pixel_buffer_texture_get_instance_private(self));
+
+  const uint8_t* buffer = nullptr;
+  if (!FL_PIXEL_BUFFER_TEXTURE_GET_CLASS(self)->copy_pixels(
+          self, &buffer, &width, &height, error)) {
+    return FALSE;
+  }
+
+  if (priv->texture_id == 0) {
+    glGenTextures(1, &priv->texture_id);
+    check_gl_error(__LINE__);
+    glBindTexture(GL_TEXTURE_2D, priv->texture_id);
+    check_gl_error(__LINE__);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+    check_gl_error(__LINE__);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+    check_gl_error(__LINE__);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    check_gl_error(__LINE__);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    check_gl_error(__LINE__);
+  } else {
+    glBindTexture(GL_TEXTURE_2D, priv->texture_id);
+    check_gl_error(__LINE__);
+  }
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA,
+               GL_UNSIGNED_BYTE, buffer);
+  check_gl_error(__LINE__);
+
+  opengl_texture->target = GL_TEXTURE_2D;
+  opengl_texture->name = priv->texture_id;
+  opengl_texture->format = GL_RGBA8;
+  opengl_texture->destruction_callback = nullptr;
+  opengl_texture->user_data = nullptr;
+  opengl_texture->width = width;
+  opengl_texture->height = height;
+
+  return TRUE;
+}
+
+static void fl_pixel_buffer_texture_class_init(
+    FlPixelBufferTextureClass* klass) {
+  G_OBJECT_CLASS(klass)->dispose = fl_pixel_buffer_texture_dispose;
+}
+
+static void fl_pixel_buffer_texture_init(FlPixelBufferTexture* self) {}

shell/platform/linux/fl_pixel_buffer_texture_private.h

@@ -0,0 +1,36 @@
+// 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_SHELL_PLATFORM_LINUX_FL_PIXEL_BUFFER_TEXTURE_PRIVATE_H_
+#define FLUTTER_SHELL_PLATFORM_LINUX_FL_PIXEL_BUFFER_TEXTURE_PRIVATE_H_
+
+#include "flutter/shell/platform/embedder/embedder.h"
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_pixel_buffer_texture.h"
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_texture_registrar.h"
+
+G_BEGIN_DECLS
+
+/**
+ * fl_pixel_buffer_texture_populate:
+ * @texture: an #FlPixelBufferTexture.
+ * @width: width of the texture.
+ * @height: height of the texture.
+ * @opengl_texture: (out): return an #FlutterOpenGLTexture.
+ * @error: (allow-none): #GError location to store the error occurring, or
+ * %NULL to ignore.
+ *
+ * Attempts to populate the specified @opengl_texture with texture details
+ * such as the name, width, height and the pixel format.
+ *
+ * Returns: %TRUE on success.
+ */
+gboolean fl_pixel_buffer_texture_populate(FlPixelBufferTexture* texture,
+                                          uint32_t width,
+                                          uint32_t height,
+                                          FlutterOpenGLTexture* opengl_texture,
+                                          GError** error);
+
+G_END_DECLS
+
+#endif  // FLUTTER_SHELL_PLATFORM_LINUX_FL_PIXEL_BUFFER_TEXTURE_PRIVATE_H_