Route render context lifecycle through platform services

src/platform_windows/windows_platform_services.cpp

@@ -1,6 +1,8 @@
 #include "pch.h"
 #include "platform_windows/windows_platform_services.h"
 
+#include "renderer_gl/opengl_capabilities.h"
+
 #include <deque>
 
 extern HWND hWnd;
@@ -8,6 +10,9 @@ extern std::deque<std::packaged_task<void()>> main_tasklist;
 extern std::mutex main_task_mutex;
 
 void destroy_window();
+void async_lock();
+void async_unlock();
+void win32_async_swap();
 void win32_update_fps(int frames);
 void win32_update_stylus(float dt);
 
@@ -178,6 +183,24 @@ public:
     {
     }
 
+    void acquire_render_context() override
+    {
+        async_lock();
+        glBindFramebuffer(
+            static_cast<GLenum>(pp::renderer::gl::framebuffer_target()),
+            static_cast<GLuint>(pp::renderer::gl::default_framebuffer_id()));
+    }
+
+    void release_render_context() override
+    {
+        async_unlock();
+    }
+
+    void present_render_context() override
+    {
+        win32_async_swap();
+    }
+
     void update_platform_frame(float delta_time_seconds) override
     {
         win32_update_stylus(delta_time_seconds);