extend to support rendering to RenderTarget/OpenGL texture on Linux

linux/CMakeLists.txt

@@ -5,18 +5,35 @@ cmake_minimum_required(VERSION 3.10)
 
 # Project-level configuration.
 set(PROJECT_NAME "polyvox_filament")
-project(${PROJECT_NAME} LANGUAGES CXX)
+project(${PROJECT_NAME})
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -fPIC -Wno-unused-variable -Wno-unused-function")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC -Wno-unused-variable")
 
 # This value is used when generating builds using this plugin, so it must
 # not be changed.
 set(PLUGIN_NAME "polyvox_filament_plugin")
 
+link_directories("${CMAKE_CURRENT_SOURCE_DIR}/lib") 
+
+add_library(FILAMENT_SHADERS SHARED 
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/include/material/image_material.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/include/material/unlitopaque.c"  
+)
+
 # Define the plugin library target. Its name must not be changed (see comment
 # on PLUGIN_NAME above).
 #
 # Any new source files that you add to the plugin should be added here.
 add_library(${PLUGIN_NAME} SHARED
   "polyvox_filament_plugin.cc"
+  "filament_texture.cc"
+  "filament_pb_texture.cc"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/src/SceneAssetLoader.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/src/SceneAsset.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/src/FilamentViewer.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/src/PolyvoxFilamentApi.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../ios/src/StreamBufferAdapter.cpp"
 )
 
 # Apply a standard set of build settings that are configured in the
@@ -31,13 +48,57 @@ set_target_properties(${PLUGIN_NAME} PROPERTIES
   CXX_VISIBILITY_PRESET hidden)
 target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
 
+target_compile_features(${PLUGIN_NAME} PRIVATE cxx_std_17)
+
 # Source include directories and library dependencies. Add any plugin-specific
 # dependencies here.
 target_include_directories(${PLUGIN_NAME} INTERFACE
   "${CMAKE_CURRENT_SOURCE_DIR}/include")
+
+include_directories(../ios/src)
+include_directories(../ios/include)
+include_directories(../example/linux)
+
 target_link_libraries(${PLUGIN_NAME} PRIVATE flutter)
 target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::GTK)
 
+
+target_link_libraries(${PLUGIN_NAME} PRIVATE
+  FILAMENT_SHADERS
+  geometry 
+  filament 
+  backend 
+  geometry 
+  filameshio 
+  viewer 
+  filamat 
+  utils 
+  filabridge 
+  gltfio_core 
+  filament-iblprefilter 
+  image 
+  camutils 
+  filaflat 
+  dracodec 
+  ibl 
+  ktxreader 
+  image
+  imageio
+  tinyexr
+  stb  
+  EGL 
+  bluevk 
+  vkshaders 
+  bluegl 
+  uberzlib 
+  smol-v 
+  uberarchive 
+  meshoptimizer
+  mathio
+  -l:libmath.a
+  geometry 
+)
+
 # List of absolute paths to libraries that should be bundled with the plugin.
 # This list could contain prebuilt libraries, or libraries created by an
 # external build triggered from this build file.

linux/filament_pb_texture.cc

@@ -0,0 +1,67 @@
+#include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_registrar.h>
+#include <flutter_linux/fl_texture.h>
+#include <flutter_linux/fl_pixel_buffer_texture.h>
+#include <flutter_linux/fl_texture_gl.h>
+#include <gtk/gtk.h>
+#include <sys/utsname.h>
+
+#include <epoxy/gl.h>
+#include "include/polyvox_filament/filament_pb_texture.h"
+
+#include <iostream>
+#include <vector>
+
+
+G_DEFINE_TYPE(FilamentPBTexture,
+              filament_pb_texture,
+              fl_pixel_buffer_texture_get_type())
+
+
+static gboolean video_texture_copy_pixels (FlPixelBufferTexture* texture,
+                               const uint8_t** out_buffer,
+                               uint32_t* width,
+                               uint32_t* height,
+                               GError** error) {
+
+    auto buffer = new std::vector<uint8_t>(400*200*4);
+    for (int i = 0; i < 400*200*4; i++)
+    {
+      if(i%4 == 1 || i % 4 == 3) {
+        buffer->at(i) = (uint8_t)255;
+      } else {
+        buffer->at(i) = (uint8_t)0;
+      }
+    }
+  *width = 400;
+  *height = 200;
+  *out_buffer = buffer->data();
+  std::cout << "COPY" << std::endl;
+  return TRUE;
+}
+
+void filament_pb_texture_dispose(GObject* object) {
+    G_OBJECT_CLASS(filament_pb_texture_parent_class)->dispose(object);
+}
+
+void filament_pb_texture_class_init(FilamentPBTextureClass* klass) {
+  G_OBJECT_CLASS(klass)->dispose = filament_pb_texture_dispose;
+  FL_PIXEL_BUFFER_TEXTURE_CLASS(klass)->copy_pixels = video_texture_copy_pixels;
+}
+
+void filament_pb_texture_init(FilamentPBTexture* self) { }
+
+FLUTTER_PLUGIN_EXPORT FlTexture* create_filament_pb_texture(uint32_t width, uint32_t height, FlTextureRegistrar* registrar) {
+
+    auto pbTexture = FILAMENT_PB_TEXTURE(g_object_new(filament_pb_texture_get_type(), nullptr));
+
+    g_autoptr(FlTexture) texture = FL_TEXTURE(pbTexture);
+   
+    if(fl_texture_registrar_register_texture(registrar, texture) == TRUE) { 
+       if(fl_texture_registrar_mark_texture_frame_available(registrar,
+                                                       texture) != TRUE) {
+         std::cout << "FAILED" << std::endl;
+       } 
+    }
+    return texture;
+}

linux/filament_texture.cc

@@ -0,0 +1,74 @@
+#include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_registrar.h>
+#include <flutter_linux/fl_texture.h>
+#include <flutter_linux/fl_texture_gl.h>
+#include <gtk/gtk.h>
+#include <sys/utsname.h>
+
+#include <epoxy/gl.h>
+#include "include/polyvox_filament/filament_texture.h"
+
+#include <iostream>
+#include <vector>
+
+
+G_DEFINE_TYPE(FilamentTextureGL,
+              filament_texture_gl,
+              fl_texture_gl_get_type())
+
+static gboolean
+filament_texture_populate (FlTextureGL *texture,
+                        uint32_t *target,
+                        uint32_t *name,
+                        uint32_t *width,
+                        uint32_t *height,
+                        GError **error) {
+  FilamentTextureGL *self = FILAMENT_TEXTURE_GL (texture);
+  *target = GL_TEXTURE_2D;
+  *name = self->texture_id;
+  *width = self->width;
+  *height = self->height;
+  return TRUE;
+}
+
+void filament_texture_gl_dispose(GObject* object) {
+    G_OBJECT_CLASS(filament_texture_gl_parent_class)->dispose(object);
+}
+
+void filament_texture_gl_class_init(FilamentTextureGLClass* klass) {
+  G_OBJECT_CLASS(klass)->dispose = filament_texture_gl_dispose;
+  FL_TEXTURE_GL_CLASS(klass)->populate = filament_texture_populate;
+}
+
+void filament_texture_gl_init(FilamentTextureGL* self) { }
+
+FLUTTER_PLUGIN_EXPORT FlTexture* create_filament_texture(uint32_t width, uint32_t height, FlTextureRegistrar* registrar) {   
+  auto textureGL = FILAMENT_TEXTURE_GL(g_object_new(filament_texture_gl_get_type(), nullptr));
+  textureGL->width = width;
+  textureGL->height = height;
+
+  g_autoptr(FlTexture) texture = FL_TEXTURE(textureGL);
+
+  
+  glGenTextures(1, &textureGL->texture_id);
+
+  glBindTexture(GL_TEXTURE_2D, textureGL->texture_id);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+  glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, textureGL->width, textureGL->height, 0, GL_RGBA,
+                  GL_UNSIGNED_BYTE, 0);
+   
+    if(fl_texture_registrar_register_texture(registrar, texture) == TRUE) { 
+
+      if(fl_texture_registrar_mark_texture_frame_available(registrar,
+                                                      texture) != TRUE) {
+        std::cout << "FAILED" << std::endl;
+        return nullptr;
+      } 
+    }
+    return texture;
+}

linux/include/polyvox_filament/filament_pb_texture.h

@@ -0,0 +1,44 @@
+#ifndef FILAMENT_PB_TEXTURE_H
+#define FILAMENT_PB_TEXTURE_H
+#include <gtk/gtk.h>
+#include <glib-object.h>
+#include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_gl.h>
+#include <flutter_linux/fl_texture.h>
+#include <flutter_linux/fl_pixel_buffer_texture.h>
+#include <flutter_linux/fl_texture_registrar.h>
+
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define FLUTTER_PLUGIN_EXPORT
+#endif
+
+
+G_BEGIN_DECLS
+
+#define FILAMENT_PB_TEXTURE(obj) \
+   (G_TYPE_CHECK_INSTANCE_CAST((obj), filament_pb_texture_get_type(), \
+                               FilamentPBTexture))
+
+struct _FilamentPBTexture {
+    FlPixelBufferTexture parent_instance;
+};
+
+typedef struct _FilamentPBTexture FilamentPBTexture;
+typedef struct {
+  FlPixelBufferTextureClass parent_instance;
+  gboolean (*copy_pixels)(FlPixelBufferTexture* texture,
+                          const uint8_t** buffer,
+                          uint32_t* width,
+                          uint32_t* height,
+                          GError** error);
+
+} FilamentPBTextureClass;
+
+G_END_DECLS
+
+FLUTTER_PLUGIN_EXPORT FlTexture* create_filament_pb_texture(uint32_t width, uint32_t height, FlTextureRegistrar* registrar);
+
+#endif 

linux/include/polyvox_filament/filament_texture.h

@@ -0,0 +1,48 @@
+#ifndef FILAMENT_TEXTURE_H
+#define FILAMENT_TEXTURE_H
+#include <gtk/gtk.h>
+#include <glib-object.h>
+#include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_gl.h>
+#include <flutter_linux/fl_texture.h>
+#include <flutter_linux/fl_texture_registrar.h>
+
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define FLUTTER_PLUGIN_EXPORT
+#endif
+
+
+G_BEGIN_DECLS
+
+#define FILAMENT_TEXTURE_GL(obj) \
+   (G_TYPE_CHECK_INSTANCE_CAST((obj), filament_texture_gl_get_type(), \
+                               FilamentTextureGL))
+
+struct _FilamentTextureGL {
+    FlTextureGL parent_instance;
+    GLuint texture_id;
+    uint32_t width;
+    uint32_t height;
+};
+
+typedef struct _FilamentTextureGL FilamentTextureGL;
+typedef struct {
+  FlTextureGLClass parent_instance;
+  gboolean (*populate)(FlTextureGL* texture,
+                       uint32_t* target,
+                       uint32_t* name,
+                       uint32_t* width,
+                       uint32_t* height,
+                       GError** error);
+
+  GLuint texture_id;
+} FilamentTextureGLClass;
+
+G_END_DECLS
+
+FLUTTER_PLUGIN_EXPORT FlTexture* create_filament_texture(uint32_t width, uint32_t height, FlTextureRegistrar* registrar);
+
+#endif 

linux/include/polyvox_filament/polyvox_filament_plugin.h

@@ -2,6 +2,7 @@
 #define FLUTTER_PLUGIN_POLYVOX_FILAMENT_PLUGIN_H_
 
 #include <flutter_linux/flutter_linux.h>
+#include <epoxy/gl.h>
 
 G_BEGIN_DECLS
 

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linux/polyvox_filament_plugin.cc

@@ -1,37 +1,176 @@
 #include "include/polyvox_filament/polyvox_filament_plugin.h"
 
 #include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_registrar.h>
+#include <flutter_linux/fl_texture_gl.h>
 #include <gtk/gtk.h>
+
+
 #include <sys/utsname.h>
 
+#include <math.h>
+#include <iostream>
 #include <cstring>
+#include <vector>
+#include <string> 
+#include <map>
+#include <unistd.h>
+
+#include "include/polyvox_filament/filament_texture.h"
+#include "include/polyvox_filament/filament_pb_texture.h"
+
+#include "FilamentViewer.hpp"
+extern "C" {
+#include "PolyvoxFilamentApi.h"
+}
+
+
+#include <epoxy/gl.h>
+#include <epoxy/glx.h>
 
 #define POLYVOX_FILAMENT_PLUGIN(obj) \
   (G_TYPE_CHECK_INSTANCE_CAST((obj), polyvox_filament_plugin_get_type(), \
                               PolyvoxFilamentPlugin))
 
+
 struct _PolyvoxFilamentPlugin {
   GObject parent_instance;
+  FlTextureRegistrar* texture_registrar;
+  FlView* fl_view;
+
+  FlTexture* texture;
+  void* _viewer;
 };
 
 G_DEFINE_TYPE(PolyvoxFilamentPlugin, polyvox_filament_plugin, g_object_get_type())
 
+static map<uint32_t, void*> _file_assets;
+static uint32_t _i = 0;
+
+static ResourceBuffer loadResource(const char* name) {
+
+    char cwd[PATH_MAX];
+    if (getcwd(cwd, sizeof(cwd)) != NULL) {
+       std::cout << "Current working dir: " << cwd  << std::endl;
+    }
+
+    string name_str(name);
+    auto id = _i++;
+    
+    if (name_str.rfind("file://", 0) == 0) {
+      name_str = name_str.substr(7);
+    }
+
+    name_str = string(cwd) + string("/") + name_str;
+
+    std::cout << "Loading resource at " << name_str.c_str() << std::endl;
+
+    streampos length;
+    ifstream is(name_str, ios::binary);
+    if(!is) {
+      std::cout << "Failed to find resource at file path " << name_str.c_str() << std::endl;
+      return ResourceBuffer(nullptr, 0, -1);
+    }
+    is.seekg (0, ios::end);
+    length = is.tellg();
+    char * buffer;
+    buffer = new char [length];
+    is.seekg (0, ios::beg);
+    is.read (buffer, length);
+    is.close();      
+    _file_assets[id] = buffer;
+    return ResourceBuffer(buffer, length, id);
+}
+
+static void freeResource(uint32_t id) {
+  std::cout << "Freeing resource " << id << std::endl;
+  auto it = _file_assets.find(id);
+  if (it != _file_assets.end()) {
+    free(it->second);
+  }
+}
+
 // Called when a method call is received from Flutter.
 static void polyvox_filament_plugin_handle_method_call(
     PolyvoxFilamentPlugin* self,
     FlMethodCall* method_call) {
+
   g_autoptr(FlMethodResponse) response = nullptr;
 
   const gchar* method = fl_method_call_get_name(method_call);
 
-  if (strcmp(method, "getPlatformVersion") == 0) {
-    struct utsname uname_data = {};
-    uname(&uname_data);
-    g_autofree gchar *version = g_strdup_printf("Linux %s", uname_data.version);
-    g_autoptr(FlValue) result = fl_value_new_string(version);
+  if(strcmp(method, "initialize") == 0) {
+
+    if(self->_viewer) {
+      std::cout << "Deleting existing viewer";
+      filament_viewer_delete(self->_viewer);
+    } 
+
+    auto context = glXGetCurrentContext();
+
+    FlValue* args = fl_method_call_get_args(method_call);
+
+    const double width = fl_value_get_float(fl_value_get_list_value(args, 0));
+    const double height = fl_value_get_float(fl_value_get_list_value(args, 1));
+   
+    auto texture = create_filament_texture(uint32_t(width), uint32_t(height), self->texture_registrar);
+    //auto texture = create_filament_pb_texture(uint32_t(width), uint32_t(height), self->texture_registrar);
+    self->texture = texture;
+    
+    g_autoptr(FlValue) result =   
+         fl_value_new_int(reinterpret_cast<int64_t>(texture));   
+
+    self->_viewer = filament_viewer_new(
+      (void*)context,
+      loadResource,
+      freeResource
+    );
+
+    // don't pass a surface to the SwapChain as we are effectively creating a headless SwapChain that will render into a RenderTarget associated with a texture
+    create_swap_chain(self->_viewer, nullptr, width, height);
+    create_render_target(self->_viewer, ((FilamentTextureGL*)texture)->texture_id,width,height);
+    
+    update_viewport_and_camera_projection(self->_viewer, width, height, 1.0f);
+    
     response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));
-  } else if {
-  
+  } else if(strcmp(method, "loadSkybox") == 0) {
+
+    FlValue* args = fl_method_call_get_args(method_call);
+
+    const gchar* path = fl_value_get_string(args);
+
+    load_skybox(self->_viewer, path);
+                                       
+    g_autoptr(FlValue) result = fl_value_new_string("OK");
+    response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));
+  } else if(strcmp(method, "removeSkybox") == 0) {
+    std::cout << "Removing skybox" << std::endl;
+    remove_skybox(self->_viewer);
+    g_autoptr(FlValue) result = fl_value_new_string("OK");
+    response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));    
+  } else if(strcmp(method, "resize") == 0) { 
+      // val args = call.arguments as ArrayList<Int>
+      // val width = args[0]
+      // val height = args[1]
+      // val scale = if(args.size > 2) (args[2] as Double).toFloat() else 1.0f
+      // surfaceTexture!!.setDefaultBufferSize(width, height)
+      // _lib.update_viewport_and_camera_projection(_viewer!!, width, height, scale);
+      // result.success(null)
+  } else if(strcmp(method, "render") == 0) {
+
+    render(self->_viewer, 0);
+    g_autoptr(FlValue) result = fl_value_new_string("OK");
+    response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));    
+  } else if(strcmp(method, "setBackgroundImage") == 0) {
+
+    FlValue* args = fl_method_call_get_args(method_call);
+
+    const gchar* path = fl_value_get_string(args);
+
+    set_background_image(self->_viewer, path);
+    
+    g_autoptr(FlValue) result = fl_value_new_string("OK");
+    response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));    
   } else {
     response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
   }
@@ -59,10 +198,16 @@ void polyvox_filament_plugin_register_with_registrar(FlPluginRegistrar* registra
   PolyvoxFilamentPlugin* plugin = POLYVOX_FILAMENT_PLUGIN(
       g_object_new(polyvox_filament_plugin_get_type(), nullptr));
 
+  FlView* fl_view = fl_plugin_registrar_get_view(registrar);
+  plugin->fl_view = fl_view;
+
+  plugin->texture_registrar =
+      fl_plugin_registrar_get_texture_registrar(registrar);
+
   g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
   g_autoptr(FlMethodChannel) channel =
       fl_method_channel_new(fl_plugin_registrar_get_messenger(registrar),
-                            "polyvox_filament",
+                            "app.polyvox.filament/event",
                             FL_METHOD_CODEC(codec));
   fl_method_channel_set_method_call_handler(channel, method_call_cb,
                                             g_object_ref(plugin),