add GL3 context

core/CMakeLists.txt

@@ -5,11 +5,13 @@ target_link_libraries(nf7_core
     luajit
     nf7_config
     nf7_iface
+    SDL2
     sqlite
     uvw
 )
 target_sources(nf7_core
   PRIVATE
+    gl3/context.cc
     luajit/context.cc
     luajit/lambda.cc
     luajit/thread.cc
@@ -18,6 +20,7 @@ target_sources(nf7_core
     uv/parallelism.cc
     version.cc
   PUBLIC
+    gl3/context.hh
     luajit/context.hh
     luajit/lambda.hh
     luajit/thread.hh
@@ -39,6 +42,7 @@ target_sources(nf7_core
 add_executable(nf7_core_test)
 target_sources(nf7_core_test
   PRIVATE
+    gl3/context_test.cc
     luajit/context_test.cc
     luajit/context_test.hh
     luajit/lambda_test.cc

core/gl3/context.cc

@@ -0,0 +1,132 @@
+// No copyright
+#include "core/gl3/context.hh"
+
+#include <SDL.h>
+
+#include <atomic>
+#include <chrono>
+#include <thread>
+#include <iostream>
+
+#include "iface/common/exception.hh"
+#include "iface/subsys/concurrency.hh"
+#include "iface/subsys/logger.hh"
+#include "iface/subsys/parallelism.hh"
+
+#include "core/logger.hh"
+
+
+namespace nf7::core::gl3 {
+
+class Context::Impl final : public std::enable_shared_from_this<Impl> {
+ public:
+  explicit Impl(Env& env)
+  try : concurrency_(env.GetOr<subsys::Concurrency>()),
+        logger_(env.GetOr<subsys::Logger>(NullLogger::kInstance)) {
+    sdl_video_ = !SDL_Init(SDL_INIT_VIDEO);
+    if (!sdl_video_) {
+      throw Exception {"SDL init failure"};
+    }
+    SetUpGL();
+    SetUpWindow();
+  } catch (const Exception&) {
+    TearDown();
+    throw;
+  }
+
+ public:
+  void Main() noexcept {
+    SDL_GL_MakeCurrent(win_, gl_);
+    SDL_GL_SetSwapInterval(1);
+
+    while (alive_) try {
+      SDL_GL_SwapWindow(win_);
+    } catch (Exception& e) {
+      logger_->Warn("error while GL3 window main loop");
+    }
+    concurrency_->Exec(
+        [this, self = shared_from_this()](auto&) { TearDown(); });
+  }
+  void Exit() noexcept {
+    alive_ = false;
+  }
+
+ private:
+  void SetUpGL() noexcept;
+  void SetUpWindow();
+
+  void TearDown() noexcept {
+    if (nullptr != gl_) {
+      SDL_GL_DeleteContext(gl_);
+    }
+    if (nullptr != win_) {
+      SDL_DestroyWindow(win_);
+    }
+    if (sdl_video_) {
+      SDL_Quit();
+    }
+  }
+
+ private:
+  const std::shared_ptr<subsys::Concurrency> concurrency_;
+  const std::shared_ptr<subsys::Logger> logger_;
+
+  std::atomic<bool> alive_ {true};
+
+  bool sdl_video_ {false};
+  SDL_Window* win_ {nullptr};
+  void* gl_ {nullptr};
+};
+
+Context::Context(Env& env)
+    : subsys::Interface("nf7::core::gl3::Context"),
+      impl_(std::make_shared<Impl>(env)) {
+  env.Get<subsys::Parallelism>()->Exec([impl = impl_](auto&) { impl->Main(); });
+}
+Context::~Context() noexcept {
+  impl_->Exit();
+}
+
+void Context::Impl::SetUpGL() noexcept {
+# if defined(__APPLE__)
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+# else
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+# endif
+}
+
+void Context::Impl::SetUpWindow() {
+  SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
+
+  SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+  SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+  SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+
+  constexpr auto flags {
+      SDL_WINDOW_OPENGL
+      | SDL_WINDOW_RESIZABLE
+      | SDL_WINDOW_ALLOW_HIGHDPI
+  };
+  win_ = SDL_CreateWindow(
+      "Dear ImGui SDL2+OpenGL3 example",
+      SDL_WINDOWPOS_CENTERED,
+      SDL_WINDOWPOS_CENTERED,
+      1280, 720,
+      flags);
+  if (nullptr == win_) {
+    throw Exception {"failed to create new window"};
+  }
+
+  gl_ = SDL_GL_CreateContext(win_);
+  if (nullptr == gl_) {
+    throw Exception {"failed to create new GL context"};
+  }
+}
+
+}  // namespace nf7::core::gl3

core/gl3/context.hh

@@ -0,0 +1,31 @@
+// No copyright
+#pragma once
+
+#include <memory>
+
+#include "iface/subsys/interface.hh"
+#include "iface/env.hh"
+
+
+namespace nf7::core::gl3 {
+
+class Context : public subsys::Interface {
+ private:
+  class Impl;
+
+ public:
+# if defined(__APPLE__)
+    static constexpr const char* kGlslVersion = "#version 150";
+# else
+    static constexpr const char* kGlslVersion = "#version 130";
+# endif
+
+ public:
+  explicit Context(Env&);
+  ~Context() noexcept override;
+
+ private:
+  std::shared_ptr<Impl> impl_;
+};
+
+}  // namespace nf7::core::gl3

core/gl3/context_test.cc

@@ -0,0 +1,47 @@
+// No copyright
+#include "core/gl3/context.hh"
+
+#include <gtest/gtest.h>
+
+#include <chrono>
+
+#include "iface/subsys/concurrency.hh"
+
+#include "iface/env_test.hh"
+
+
+using namespace std::literals;
+
+
+class Gl3Context : public nf7::test::EnvFixtureWithTasking {
+ public:
+  Gl3Context() noexcept : skip_(nullptr == std::getenv("NF7_TEST_GL3")) { }
+
+ public:
+  void SetUp() override {
+    if (skip_) {
+      GTEST_SKIP();
+    } else {
+      nf7::test::EnvFixtureWithTasking::SetUp();
+    }
+  }
+  void TearDown() override {
+    if (!skip_) {
+      nf7::test::EnvFixtureWithTasking::TearDown();
+    }
+  }
+
+ private:
+  const bool skip_;
+};
+
+TEST_F(Gl3Context, Initialization) {
+  auto ctx = std::make_shared<nf7::core::gl3::Context>(env());
+
+  env().Get<nf7::subsys::Concurrency>()->Push(nf7::SyncTask {
+    std::chrono::time_point_cast<std::chrono::milliseconds>(
+        std::chrono::system_clock::now())+1000ms,
+    [&](auto&) { ctx = nullptr; },
+  });
+  ConsumeTasks();
+}

iface/env_test.hh

@@ -120,7 +120,7 @@ class EnvFixtureWithTasking : public EnvFixture {
   };
 
  public:
-  explicit EnvFixtureWithTasking(SimpleEnv::FactoryMap&& fmap)
+  explicit EnvFixtureWithTasking(SimpleEnv::FactoryMap&& fmap = {})
       : EnvFixture(std::move(fmap)),
         sq_(std::make_shared<SimpleTaskQueue<SyncTask>>()),
         aq_(std::make_shared<SimpleTaskQueue<AsyncTask>>()),

thirdparty/CMakeLists.txt

@@ -2,6 +2,15 @@ set(BUILD_TESTING OFF)
 
 include(FetchContent)
 
+# ---- gtest (BSD-3-Clause)
+FetchContent_Declare(
+  googletest
+  GIT_REPOSITORY https://github.com/google/googletest.git
+  GIT_TAG        v1.13.0
+)
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
 # ---- luajit (MIT)
 FetchContent_Declare(
   luajit
@@ -11,14 +20,9 @@ FetchContent_Declare(
 FetchContent_Populate(luajit)
 include(luajit.cmake)
 
-# ---- gtest (BSD-3-Clause)
-FetchContent_Declare(
-  googletest
-  GIT_REPOSITORY https://github.com/google/googletest.git
-  GIT_TAG        v1.13.0
-)
-set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-FetchContent_MakeAvailable(googletest)
+# ---- SDL2 (zlib)
+find_package(SDL2 REQUIRED GLOBAL)
+add_library(SDL2 ALIAS SDL2::SDL2)
 
 # ---- SQLite (public domain)
 FetchContent_Declare(