diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..6f87c94
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,36 @@
+name: ci
+on:
+  push:
+    tags-ignore: v*.*
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: init
+        run: sudo apt install -yqq ninja-build xorg-dev g++-11
+      - name: configure gcc
+        run: cmake -S . --preset=default -B build -DCMAKE_CXX_COMPILER=g++-11 -DFACADE_BUILD_SHADERS=OFF
+      - name: configure clang
+        run: cmake -S . --preset=ninja-clang -B clang -DFACADE_BUILD_SHADERS=OFF
+      - name: build gcc
+        run: cmake --build build --config=Release
+      - name: build clang
+        run: cmake --build clang --config=Release
+      - name: test
+        run: cd build && ctest -C Release
+  build-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: configure
+        run: cmake -S . --preset=vs22 -B build -DFACADE_BUILD_SHADERS=OFF
+      - name: build
+        run: cmake --build build --config=Release
+      - name: test
+        run: cd build && ctest -C Release
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30c602d..d384d36 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,27 +6,31 @@ set(CMAKE_DEBUG_POSTFIX "-d")
 
 project(facade)
 
+option(FACADE_BUILD_SHADERS ON)
+
 add_subdirectory(ext)
 add_subdirectory(cmake/interface)
 add_subdirectory(tools/embed_shader)
 
 add_subdirectory(facade-lib)
 
-add_custom_command(
-  DEPENDS
-  ${CMAKE_CURRENT_SOURCE_DIR}/shaders/default.vert
-  ${CMAKE_CURRENT_SOURCE_DIR}/shaders/unlit.frag
-  ${CMAKE_CURRENT_SOURCE_DIR}/shaders/lit.frag
-
-  OUTPUT
-  ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/default_vert.spv.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/unlit_frag.spv.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/lit_frag.spv.hpp
-
-  COMMAND embed-shader ${CMAKE_CURRENT_SOURCE_DIR}/shaders/default.vert > ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/default_vert.spv.hpp
-  COMMAND embed-shader ${CMAKE_CURRENT_SOURCE_DIR}/shaders/unlit.frag > ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/unlit_frag.spv.hpp
-  COMMAND embed-shader ${CMAKE_CURRENT_SOURCE_DIR}/shaders/lit.frag > ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/lit_frag.spv.hpp
-)
+if(FACADE_BUILD_SHADERS)
+  add_custom_command(
+    DEPENDS
+    ${CMAKE_CURRENT_SOURCE_DIR}/shaders/default.vert
+    ${CMAKE_CURRENT_SOURCE_DIR}/shaders/unlit.frag
+    ${CMAKE_CURRENT_SOURCE_DIR}/shaders/lit.frag
+
+    OUTPUT
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/default_vert.spv.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/unlit_frag.spv.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/lit_frag.spv.hpp
+
+    COMMAND embed-shader ${CMAKE_CURRENT_SOURCE_DIR}/shaders/default.vert > ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/default_vert.spv.hpp
+    COMMAND embed-shader ${CMAKE_CURRENT_SOURCE_DIR}/shaders/unlit.frag > ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/unlit_frag.spv.hpp
+    COMMAND embed-shader ${CMAKE_CURRENT_SOURCE_DIR}/shaders/lit.frag > ${CMAKE_CURRENT_SOURCE_DIR}/src/bin/lit_frag.spv.hpp
+  )
+endif()
 
 add_executable(${PROJECT_NAME})
 
diff --git a/facade-lib/src/detail/gltf.cpp b/facade-lib/src/detail/gltf.cpp
index d894735..3fd2563 100644
--- a/facade-lib/src/detail/gltf.cpp
+++ b/facade-lib/src/detail/gltf.cpp
@@ -538,7 +538,7 @@ Geometry build_geometry(Data const data, MeshData::Primitive const& mp) {
 Transform transform(dj::Json const& node) {
 	auto ret = Transform{};
 	if (auto const& mat = node["matrix"]) {
-		auto const& arr = mat.array_view();
+		[[maybe_unused]] auto const& arr = mat.array_view();
 		assert(arr.size() == 16);
 		ret.set_matrix(to<glm::mat4x4>(mat));
 	} else {
diff --git a/facade-lib/src/glfw/glfw.cpp b/facade-lib/src/glfw/glfw.cpp
index eec6222..d2ed754 100644
--- a/facade-lib/src/glfw/glfw.cpp
+++ b/facade-lib/src/glfw/glfw.cpp
@@ -1,19 +1,18 @@
 #include <facade/glfw/glfw.hpp>
 #include <facade/util/error.hpp>
-#include <atomic>
 #include <mutex>
 #include <unordered_map>
 
 namespace facade {
 namespace {
-std::atomic<std::weak_ptr<Glfw>> g_glfw{};
+std::weak_ptr<Glfw> g_glfw{};
 std::mutex g_mutex{};
 
 std::unordered_map<GLFWwindow*, Glfw::State> g_states{};
 
 std::shared_ptr<Glfw> get_or_make_glfw() {
-	if (auto glfw = g_glfw.load().lock()) { return glfw; }
 	auto lock = std::scoped_lock{g_mutex};
+	if (auto glfw = g_glfw.lock()) { return glfw; }
 	if (glfwInit() != GLFW_TRUE) { throw InitError{"GLFW initialization failed"}; }
 	if (!glfwVulkanSupported()) {
 		glfwTerminate();
@@ -21,7 +20,7 @@ std::shared_ptr<Glfw> get_or_make_glfw() {
 	}
 	auto ret = std::make_shared<Glfw>();
 	ret->active = true;
-	g_glfw.load() = ret;
+	g_glfw = ret;
 	return ret;
 }
 
diff --git a/facade-lib/src/vk/pipes.cpp b/facade-lib/src/vk/pipes.cpp
index b175209..22925de 100644
--- a/facade-lib/src/vk/pipes.cpp
+++ b/facade-lib/src/vk/pipes.cpp
@@ -7,7 +7,7 @@
 
 namespace facade {
 namespace {
-constexpr bool has_all_sets(std::span<SetLayout const> layouts) {
+[[maybe_unused]] constexpr bool has_all_sets(std::span<SetLayout const> layouts) {
 	std::uint32_t set{};
 	for (auto const& layout : layouts) {
 		if (layout.set != set) { return false; }
diff --git a/facade-lib/src/vk/vma.cpp b/facade-lib/src/vk/vma.cpp
index de17cdd..e832837 100644
--- a/facade-lib/src/vk/vma.cpp
+++ b/facade-lib/src/vk/vma.cpp
@@ -32,7 +32,7 @@ UniqueBuffer Vma::make_buffer(vk::BufferUsageFlags const usage, vk::DeviceSize c
 	ret.allocation.vma = *this;
 	ret.size = bci.size;
 	if (host_visible) { vmaMapMemory(allocator, ret.allocation.allocation, &ret.ptr); }
-	return ret;
+	return UniqueBuffer{std::move(ret)};
 }
 
 UniqueImage Vma::make_image(ImageCreateInfo const& info, vk::Extent2D const extent) const {
@@ -56,7 +56,7 @@ UniqueImage Vma::make_image(ImageCreateInfo const& info, vk::Extent2D const exte
 	ret.image = image;
 	ret.allocation.vma = *this;
 	ret.extent = extent;
-	return ret;
+	return UniqueImage{std::move(ret)};
 }
 
 vk::UniqueImageView Vma::make_image_view(vk::Image const image, vk::Format const format, vk::ImageSubresourceRange isr) const {