diff --git a/src/engine/BUILD.gn b/src/engine/BUILD.gn
index 21e51a5..5def641 100644
--- a/src/engine/BUILD.gn
+++ b/src/engine/BUILD.gn
@@ -14,15 +14,6 @@ source_set("engine") {
     "asset/shader_source.h",
     "asset/sound.cc",
     "asset/sound.h",
-    "audio/audio_bus.cc",
-    "audio/audio_bus.h",
-    "audio/audio_mixer.cc",
-    "audio/audio_mixer.h",
-    "audio/audio_sink.h",
-    "audio/mixer_input.cc",
-    "audio/mixer_input.h",
-    "audio/sinc_resampler.cc",
-    "audio/sinc_resampler.h",
     "drawable.cc",
     "drawable.h",
     "engine.cc",
@@ -34,111 +25,21 @@ source_set("engine") {
     "input_event.h",
     "persistent_data.cc",
     "persistent_data.h",
-    "platform/asset_file.cc",
-    "platform/asset_file.h",
-    "platform/platform.h",
-    "platform/platform_observer.h",
-    "renderer/geometry.cc",
-    "renderer/geometry.h",
-    "renderer/opengl/opengl.h",
-    "renderer/opengl/renderer_opengl.cc",
-    "renderer/opengl/renderer_opengl.h",
-    "renderer/render_resource.h",
-    "renderer/renderer.h",
-    "renderer/renderer_types.cc",
-    "renderer/renderer_types.h",
-    "renderer/shader.cc",
-    "renderer/shader.h",
-    "renderer/texture.cc",
-    "renderer/texture.h",
-    "renderer/vulkan/renderer_vulkan.cc",
-    "renderer/vulkan/vulkan_context.cc",
     "solid_quad.cc",
     "solid_quad.h",
     "sound_player.cc",
     "sound_player.h",
   ]
 
-  libs = []
-
-  if (target_os == "linux" || target_os == "win") {
-    sources += [ "platform/asset_file_generic.cc" ]
-  }
-
-  if (target_os == "linux") {
-    sources += [
-      "audio/audio_sink_alsa.cc",
-      "audio/audio_sink_alsa.h",
-      "platform/platform_linux.cc",
-      "renderer/opengl/renderer_opengl_linux.cc",
-      "renderer/vulkan/renderer_vulkan_linux.cc",
-      "renderer/vulkan/vulkan_context_linux.cc",
-    ]
-
-    libs += [
-      "X11",
-      "GL",
-      "asound",
-    ]
-  }
-
-  if (target_os == "win") {
-    sources += [
-      "audio/audio_sink_null.h",
-      "platform/platform_win.cc",
-      "renderer/opengl/renderer_opengl_win.cc",
-      "renderer/vulkan/renderer_vulkan_win.cc",
-      "renderer/vulkan/vulkan_context_win.cc",
-    ]
-
-    libs = [
-      "gdi32.lib",  # Graphics
-      "user32.lib",  # Win32 API core functionality.
-      "opengl32.lib",
-    ]
-  }
-
-  if (target_os == "android") {
-    sources += [
-      "audio/audio_sink_oboe.cc",
-      "audio/audio_sink_oboe.h",
-      "platform/asset_file_android.cc",
-      "platform/platform_android.cc",
-      "renderer/opengl/renderer_opengl_android.cc",
-      "renderer/vulkan/renderer_vulkan_android.cc",
-      "renderer/vulkan/vulkan_context_android.cc",
-    ]
-
-    libs += [
-      "android",
-      "EGL",
-      "GLESv2",
-      "log",
-      "z",
-    ]
-  }
-
   deps = [
     "//assets/engine",
     "//src/base",
-    "//src/third_party/glslang",
+    "//src/engine/audio",
+    "//src/engine/platform",
+    "//src/engine/renderer",
     "//src/third_party/jsoncpp",
     "//src/third_party/minimp3",
-    "//src/third_party/spirv-reflect",
     "//src/third_party/stb",
     "//src/third_party/texture_compressor",
-    "//src/third_party/vma",
-    "//src/third_party/vulkan",
-    "//src/third_party/volk",
   ]
-
-  if (target_os == "android") {
-    deps += [
-      "//src/third_party/android",
-      "//src/third_party/oboe",
-      "//src/third_party/minizip",
-    ]
-  } else {
-    deps += [ "//src/third_party/glew" ]
-  }
 }
diff --git a/src/engine/audio/BUILD.gn b/src/engine/audio/BUILD.gn
new file mode 100644
index 0000000..5a73770
--- /dev/null
+++ b/src/engine/audio/BUILD.gn
@@ -0,0 +1,32 @@
+source_set("audio") {
+  sources = [
+    "audio_bus.cc",
+    "audio_bus.h",
+    "audio_mixer.cc",
+    "audio_mixer.h",
+    "audio_sink.h",
+    "mixer_input.cc",
+    "mixer_input.h",
+    "sinc_resampler.cc",
+    "sinc_resampler.h",
+  ]
+
+  libs = []
+  deps = [ "//src/base" ]
+
+  if (target_os == "linux") {
+    sources += [
+      "audio_sink_alsa.cc",
+      "audio_sink_alsa.h",
+    ]
+    libs += [ "asound" ]
+  } else if (target_os == "win") {
+    sources += [ "audio_sink_null.h" ]
+  } else if (target_os == "android") {
+    sources += [
+      "audio_sink_oboe.cc",
+      "audio_sink_oboe.h",
+    ]
+    deps += [ "//src/third_party/oboe" ]
+  }
+}
diff --git a/src/engine/engine.cc b/src/engine/engine.cc
index ff72159..bfbd9c2 100644
--- a/src/engine/engine.cc
+++ b/src/engine/engine.cc
@@ -17,11 +17,9 @@
 #include "engine/input_event.h"
 #include "engine/platform/platform.h"
 #include "engine/renderer/geometry.h"
-#include "engine/renderer/opengl/renderer_opengl.h"
 #include "engine/renderer/renderer.h"
 #include "engine/renderer/shader.h"
 #include "engine/renderer/texture.h"
-#include "engine/renderer/vulkan/renderer_vulkan.h"
 #include "third_party/texture_compressor/texture_compressor.h"
 
 using namespace base;
@@ -554,22 +552,10 @@ void Engine::AddInputEvent(std::unique_ptr<InputEvent> event) {
 }
 
 void Engine::CreateRendererInternal(RendererType type) {
-  if ((dynamic_cast<RendererVulkan*>(renderer_.get()) &&
-       type == RendererType::kVulkan) ||
-      (dynamic_cast<RendererOpenGL*>(renderer_.get()) &&
-       type == RendererType::kOpenGL))
+  if (renderer_ && renderer_->GetRendererType() == type)
     return;
 
-  if (type == RendererType::kVulkan) {
-    renderer_ =
-        std::make_unique<RendererVulkan>(std::bind(&Engine::ContextLost, this));
-  } else if (type == RendererType::kOpenGL) {
-    renderer_ =
-        std::make_unique<RendererOpenGL>(std::bind(&Engine::ContextLost, this));
-  } else {
-    NOTREACHED();
-  }
-
+  renderer_ = Renderer::Create(type, std::bind(&Engine::ContextLost, this));
   bool result = renderer_->Initialize(platform_);
   if (!result && type == RendererType::kVulkan) {
     LOG(0) << "Failed to initialize " << renderer_->GetDebugName()
diff --git a/src/engine/platform/BUILD.gn b/src/engine/platform/BUILD.gn
new file mode 100644
index 0000000..81172c2
--- /dev/null
+++ b/src/engine/platform/BUILD.gn
@@ -0,0 +1,46 @@
+source_set("platform") {
+  sources = [
+    "asset_file.cc",
+    "asset_file.h",
+    "platform.h",
+    "platform_observer.h",
+  ]
+
+  libs = []
+  deps = [ "//src/base" ]
+
+  if (target_os == "linux" || target_os == "win") {
+    sources += [ "asset_file_generic.cc" ]
+  }
+
+  if (target_os == "linux") {
+    sources += [ "platform_linux.cc" ]
+    libs += [
+      "X11",
+      "GL",
+    ]
+  } else if (target_os == "win") {
+    sources += [ "platform_win.cc" ]
+    libs = [
+      "gdi32.lib",  # Graphics
+      "user32.lib",  # Win32 API core functionality.
+      "opengl32.lib",
+    ]
+  } else if (target_os == "android") {
+    sources += [
+      "asset_file_android.cc",
+      "platform_android.cc",
+    ]
+    libs += [
+      "android",
+      "EGL",
+      "GLESv3",
+      "log",
+      "z",
+    ]
+    deps += [
+      "//src/third_party/android",
+      "//src/third_party/minizip",
+    ]
+  }
+}
diff --git a/src/engine/renderer/BUILD.gn b/src/engine/renderer/BUILD.gn
new file mode 100644
index 0000000..4ab5a91
--- /dev/null
+++ b/src/engine/renderer/BUILD.gn
@@ -0,0 +1,55 @@
+source_set("renderer") {
+  sources = [
+    "geometry.cc",
+    "geometry.h",
+    "opengl/opengl.h",
+    "opengl/renderer_opengl.cc",
+    "opengl/renderer_opengl.h",
+    "render_resource.h",
+    "renderer.cc",
+    "renderer.h",
+    "renderer_types.cc",
+    "renderer_types.h",
+    "shader.cc",
+    "shader.h",
+    "texture.cc",
+    "texture.h",
+    "vulkan/renderer_vulkan.cc",
+    "vulkan/vulkan_context.cc",
+  ]
+
+  if (target_os == "linux") {
+    sources += [
+      "opengl/renderer_opengl_linux.cc",
+      "vulkan/renderer_vulkan_linux.cc",
+      "vulkan/vulkan_context_linux.cc",
+    ]
+  } else if (target_os == "win") {
+    sources += [
+      "opengl/renderer_opengl_win.cc",
+      "vulkan/renderer_vulkan_win.cc",
+      "vulkan/vulkan_context_win.cc",
+    ]
+  } else if (target_os == "android") {
+    sources += [
+      "opengl/renderer_opengl_android.cc",
+      "vulkan/renderer_vulkan_android.cc",
+      "vulkan/vulkan_context_android.cc",
+    ]
+  }
+
+  deps = [
+    "//src/base",
+    "//src/third_party/glslang",
+    "//src/third_party/spirv-reflect",
+    "//src/third_party/vma",
+    "//src/third_party/volk",
+    "//src/third_party/vulkan",
+  ]
+
+  if (target_os == "android") {
+    deps += [ "//src/third_party/android" ]
+  } else {
+    deps += [ "//src/third_party/glew" ]
+  }
+}
diff --git a/src/engine/renderer/renderer.cc b/src/engine/renderer/renderer.cc
new file mode 100644
index 0000000..c081fb4
--- /dev/null
+++ b/src/engine/renderer/renderer.cc
@@ -0,0 +1,23 @@
+#include "engine/renderer/renderer.h"
+
+#include "base/log.h"
+#include "engine/renderer/opengl/renderer_opengl.h"
+#include "engine/renderer/vulkan/renderer_vulkan.h"
+
+namespace eng {
+
+// static
+std::unique_ptr<Renderer> Renderer::Create(RendererType type,
+                                           base::Closure context_lost_cb) {
+  std::unique_ptr<Renderer> renderer;
+  if (type == RendererType::kVulkan) {
+    renderer = std::make_unique<RendererVulkan>(std::move(context_lost_cb));
+  } else if (type == RendererType::kOpenGL) {
+    renderer = std::make_unique<RendererOpenGL>(std::move(context_lost_cb));
+  } else {
+    NOTREACHED();
+  }
+  return renderer;
+}
+
+}  // namespace eng
diff --git a/src/engine/renderer/renderer.h b/src/engine/renderer/renderer.h
index e01e7d6..16831a4 100644
--- a/src/engine/renderer/renderer.h
+++ b/src/engine/renderer/renderer.h
@@ -21,6 +21,9 @@ class Renderer {
  public:
   const unsigned kInvalidId = 0;
 
+  static std::unique_ptr<Renderer> Create(RendererType type,
+                                          base::Closure context_lost_cb);
+
   Renderer(base::Closure context_lost_cb)
       : context_lost_cb_{std::move(context_lost_cb)} {}
   virtual ~Renderer() = default;