initial commit. can build openmvg into archimedes

src/CMakeLists.txt

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+# The Flutter tooling requires that developers have CMake 3.10 or later
+# installed. You should not increase this version, as doing so will cause
+# the plugin to fail to compile for some customers of the plugin.
+cmake_minimum_required(VERSION 3.10)
+
+include(ExternalProject)
+
+project(archimedes_mobile_lib_library VERSION 0.0.1 LANGUAGES C)
+
+ExternalProject_Add(openMVG
+  GIT_REPOSITORY "git@github.com:src-r-r/openMVG.git"
+  GIT_TAG "develop"
+  SOURCE_SUBDIR "src"
+  CMAKE_ARGS "-DCMAKE_INSTALL_PREFIX=${CMAKE_BUILD_DIR} -DCMAKE_INCLUDE-PATH=${CMAKE_BUILD_DIR}/include"
+  PREFIX ${CMAKE_BUILD_DIR}
+  INSTALL_DIR ${CMAKE_BUILD_DIR}
+)
+
+add_library(archimedes_mobile_lib SHARED
+  "archimedes_mobile_lib.c"
+)
+
+target_link_libraries(archimedes_mobile_lib ${OPENMVG_LIBRARIES})
+include_directories(${OPENMVG_INCLUDE_DIRS})
+
+set_target_properties(archimedes_mobile_lib PROPERTIES
+  PUBLIC_HEADER archimedes_mobile_lib.h
+  OUTPUT_NAME "archimedes_mobile_lib"
+)
+
+target_compile_definitions(archimedes_mobile_lib PUBLIC DART_SHARED_LIB)

src/archimedes_mobile_lib.c

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+#include "archimedes_mobile_lib.h"
+
+// A very short-lived native function.
+//
+// For very short-lived functions, it is fine to call them on the main isolate.
+// They will block the Dart execution while running the native function, so
+// only do this for native functions which are guaranteed to be short-lived.
+FFI_PLUGIN_EXPORT intptr_t sum(intptr_t a, intptr_t b) { return a + b; }
+
+// A longer-lived native function, which occupies the thread calling it.
+//
+// Do not call these kind of native functions in the main isolate. They will
+// block Dart execution. This will cause dropped frames in Flutter applications.
+// Instead, call these native functions on a separate isolate.
+FFI_PLUGIN_EXPORT intptr_t sum_long_running(intptr_t a, intptr_t b) {
+  // Simulate work.
+#if _WIN32
+  Sleep(5000);
+#else
+  usleep(5000 * 1000);
+#endif
+  return a + b;
+}

src/archimedes_mobile_lib.h

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+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if _WIN32
+#include <windows.h>
+#else
+#include <pthread.h>
+#include <unistd.h>
+#endif
+
+#if _WIN32
+#define FFI_PLUGIN_EXPORT __declspec(dllexport)
+#else
+#define FFI_PLUGIN_EXPORT
+#endif
+
+// A very short-lived native function.
+//
+// For very short-lived functions, it is fine to call them on the main isolate.
+// They will block the Dart execution while running the native function, so
+// only do this for native functions which are guaranteed to be short-lived.
+FFI_PLUGIN_EXPORT intptr_t sum(intptr_t a, intptr_t b);
+
+// A longer lived native function, which occupies the thread calling it.
+//
+// Do not call these kind of native functions in the main isolate. They will
+// block Dart execution. This will cause dropped frames in Flutter applications.
+// Instead, call these native functions on a separate isolate.
+FFI_PLUGIN_EXPORT intptr_t sum_long_running(intptr_t a, intptr_t b);