Route render target binding through platform services

src/platform_legacy/legacy_platform_services.cpp

@@ -3,6 +3,7 @@
 
 #include "app.h"
 #include "app_core/document_platform_io.h"
+#include "renderer_gl/opengl_capabilities.h"
 
 #ifdef __ANDROID__
 void displayKeyboard(bool pShow);
@@ -224,6 +225,22 @@ public:
 #endif
     }
 
+    void bind_default_render_target() override
+    {
+        glBindFramebuffer(
+            static_cast<GLenum>(pp::renderer::gl::framebuffer_target()),
+            pp::renderer::gl::default_framebuffer_id());
+    }
+
+    void bind_main_render_target() override
+    {
+#if __IOS__
+        [App::I->ios_view->glview bindDrawable];
+#else
+        bind_default_render_target();
+#endif
+    }
+
     void begin_render_capture_frame() override
     {
     }