diff --git a/src/Magnum/Platform/GlfwApplication.cpp b/src/Magnum/Platform/GlfwApplication.cpp
index 6316cfee9..a2d6bf0f7 100644
--- a/src/Magnum/Platform/GlfwApplication.cpp
+++ b/src/Magnum/Platform/GlfwApplication.cpp
@@ -465,7 +465,11 @@ void GlfwApplication::setupCallbacks() {
     });
     glfwSetFramebufferSizeCallback(_window, [](GLFWwindow* const window, const int w, const int h) {
         auto& app = *static_cast<GlfwApplication*>(glfwGetWindowUserPointer(window));
-        ViewportEvent e{{w, h}, app.framebufferSize(), app.dpiScaling()};
+        ViewportEvent e{{w, h}
+            #ifdef MAGNUM_TARGET_GL
+            , app.framebufferSize()
+            #endif
+            , app.dpiScaling()};
         static_cast<GlfwApplication*>(glfwGetWindowUserPointer(window))->viewportEvent(e);
     });
     glfwSetKeyCallback(_window, [](GLFWwindow* const window, const int key, int, const int action, const int mods) {
@@ -523,6 +527,7 @@ Vector2i GlfwApplication::windowSize() const {
     return size;
 }
 
+#ifdef MAGNUM_TARGET_GL
 Vector2i GlfwApplication::framebufferSize() const {
     CORRADE_ASSERT(_window, "Platform::GlfwApplication::framebufferSize(): no window opened", {});
 
@@ -530,6 +535,7 @@ Vector2i GlfwApplication::framebufferSize() const {
     glfwGetFramebufferSize(_window, &size.x(), &size.y());
     return size;
 }
+#endif
 
 void GlfwApplication::setSwapInterval(const Int interval) {
     glfwSwapInterval(interval);
diff --git a/src/Magnum/Platform/GlfwApplication.h b/src/Magnum/Platform/GlfwApplication.h
index 34ea7cf11..cc46930f0 100644
--- a/src/Magnum/Platform/GlfwApplication.h
+++ b/src/Magnum/Platform/GlfwApplication.h
@@ -1206,15 +1206,22 @@ class GlfwApplication::ViewportEvent {
          */
         Vector2i windowSize() const { return _windowSize; }
 
+        #if defined(MAGNUM_TARGET_GL) || defined(DOXYGEN_GENERATING_OUTPUT)
         /**
          * @brief Framebuffer size
          *
          * On some platforms with HiDPI displays, framebuffer size can be
          * different from @ref windowSize(). See
          * @ref Platform-GlfwApplication-dpi for more information.
-         * @see @ref GlfwApplication::framebufferSize()
+         *
+         * @note This function is available only if Magnum is compiled with
+         *      @ref MAGNUM_TARGET_GL enabled (done by default). See
+         *      @ref building-features for more information.
+         *
+         * @see @ref GlfwApplication::framebufferSize(), @ref dpiScaling()
          */
         Vector2i framebufferSize() const { return _framebufferSize; }
+        #endif
 
         /**
          * @brief DPI scaling
@@ -1223,17 +1230,27 @@ class GlfwApplication::ViewportEvent {
          * scaling value being changed in tandem with a window/framebuffer
          * size. Simply resizing a window doesn't change the DPI scaling value.
          * See @ref Platform-GlfwApplication-dpi for more information.
-         * @see @ref GlfwApplication::dpiScaling()
+         * @see @ref GlfwApplication::dpiScaling(), @ref framebufferSize()
          */
         Vector2 dpiScaling() const { return _dpiScaling; }
 
     private:
         friend GlfwApplication;
 
-        explicit ViewportEvent(const Vector2i& windowSize, const Vector2i& framebufferSize, const Vector2& dpiScaling): _windowSize{windowSize}, _framebufferSize{framebufferSize}, _dpiScaling{dpiScaling} {}
+        explicit ViewportEvent(const Vector2i& windowSize,
+            #ifdef MAGNUM_TARGET_GL
+            const Vector2i& framebufferSize,
+            #endif
+            const Vector2& dpiScaling): _windowSize{windowSize},
+                #ifdef MAGNUM_TARGET_GL
+                _framebufferSize{framebufferSize},
+                #endif
+                _dpiScaling{dpiScaling} {}
 
         const Vector2i _windowSize;
+        #ifdef MAGNUM_TARGET_GL
         const Vector2i _framebufferSize;
+        #endif
         const Vector2 _dpiScaling;
 };
 
diff --git a/src/Magnum/Platform/Sdl2Application.cpp b/src/Magnum/Platform/Sdl2Application.cpp
index 71289ebb1..44ad30403 100644
--- a/src/Magnum/Platform/Sdl2Application.cpp
+++ b/src/Magnum/Platform/Sdl2Application.cpp
@@ -547,6 +547,7 @@ Vector2i Sdl2Application::windowSize() const {
     return size;
 }
 
+#ifdef MAGNUM_TARGET_GL
 Vector2i Sdl2Application::framebufferSize() const {
     Vector2i size;
     #ifndef CORRADE_TARGET_EMSCRIPTEN
@@ -558,6 +559,7 @@ Vector2i Sdl2Application::framebufferSize() const {
     #endif
     return size;
 }
+#endif
 
 #ifdef CORRADE_TARGET_EMSCRIPTEN
 void Sdl2Application::setContainerCssClass(const std::string& cssClass) {
@@ -671,7 +673,11 @@ void Sdl2Application::mainLoopIteration() {
                            https://github.com/kripken/emscripten/issues/1731 */
                         CORRADE_ASSERT_UNREACHABLE();
                         #else
-                        ViewportEvent e{event, {event.window.data1, event.window.data2}, framebufferSize(), _dpiScaling};
+                        ViewportEvent e{event, {event.window.data1, event.window.data2},
+                            #ifdef MAGNUM_TARGET_GL
+                            framebufferSize(),
+                            #endif
+                            _dpiScaling};
                         /** @todo handle also WM_DPICHANGED events when a window is moved between displays with different DPI */
                         viewportEvent(e);
                         _flags |= Flag::Redraw;
@@ -835,7 +841,13 @@ void Sdl2Application::anyEvent(SDL_Event&) {
 void Sdl2Application::viewportEvent(ViewportEvent& event) {
     #ifdef MAGNUM_BUILD_DEPRECATED
     CORRADE_IGNORE_DEPRECATED_PUSH
-    viewportEvent(event.framebufferSize());
+    viewportEvent(
+        #ifdef MAGNUM_TARGET_GL
+        event.framebufferSize()
+        #else
+        event.windowSize()
+        #endif
+    );
     CORRADE_IGNORE_DEPRECATED_POP
     #else
     static_cast<void>(event);
diff --git a/src/Magnum/Platform/Sdl2Application.h b/src/Magnum/Platform/Sdl2Application.h
index 613b9a190..9a5ddba96 100644
--- a/src/Magnum/Platform/Sdl2Application.h
+++ b/src/Magnum/Platform/Sdl2Application.h
@@ -657,7 +657,7 @@ class Sdl2Application {
          *      @ref MAGNUM_TARGET_GL enabled (done by default). See
          *      @ref building-features for more information.
          *
-         * @see @ref dpiScaling()
+         * @see @ref Sdl2Application::framebufferSize(), @ref dpiScaling()
          */
         Vector2i framebufferSize() const;
         #endif
@@ -670,7 +670,7 @@ class Sdl2Application {
          * zero vector, use @ref dpiScaling(const Configuration&) const for
          * calculating a value independently. See @ref Platform-Sdl2Application-dpi
          * for more information.
-         * @see @ref framebufferSize()
+         * @see @ref Sdl2Application::dpiScaling(), @ref framebufferSize()
          */
         Vector2 dpiScaling() const { return _dpiScaling; }
 
@@ -1740,15 +1740,22 @@ class Sdl2Application::ViewportEvent {
          */
         Vector2i windowSize() const { return _windowSize; }
 
+        #if defined(MAGNUM_TARGET_GL) || defined(DOXYGEN_GENERATING_OUTPUT)
         /**
          * @brief Framebuffer size
          *
          * On some platforms with HiDPI displays, framebuffer size can be
          * different from @ref windowSize(). See
          * @ref Platform-Sdl2Application-dpi for more information.
+         *
+         * @note This function is available only if Magnum is compiled with
+         *      @ref MAGNUM_TARGET_GL enabled (done by default). See
+         *      @ref building-features for more information.
+         *
          * @see @ref Sdl2Application::framebufferSize()
          */
         Vector2i framebufferSize() const { return _framebufferSize; }
+        #endif
 
         /**
          * @brief DPI scaling
@@ -1779,17 +1786,27 @@ class Sdl2Application::ViewportEvent {
             #ifndef CORRADE_TARGET_EMSCRIPTEN
             const SDL_Event& event,
             #endif
-            const Vector2i& windowSize, const Vector2i& framebufferSize, const Vector2& dpiScaling):
+            const Vector2i& windowSize,
+            #ifdef MAGNUM_TARGET_GL
+            const Vector2i& framebufferSize,
+            #endif
+            const Vector2& dpiScaling):
                 #ifndef CORRADE_TARGET_EMSCRIPTEN
                 _event(event),
                 #endif
-                _windowSize{windowSize}, _framebufferSize{framebufferSize}, _dpiScaling{dpiScaling} {}
+                _windowSize{windowSize},
+                #ifdef MAGNUM_TARGET_GL
+                _framebufferSize{framebufferSize},
+                #endif
+                _dpiScaling{dpiScaling} {}
 
         #ifndef CORRADE_TARGET_EMSCRIPTEN
         const SDL_Event& _event;
         #endif
         const Vector2i _windowSize;
+        #ifdef MAGNUM_TARGET_GL
         const Vector2i _framebufferSize;
+        #endif
         const Vector2 _dpiScaling;
 };
 
diff --git a/src/Magnum/Platform/Test/GlfwApplicationTest.cpp b/src/Magnum/Platform/Test/GlfwApplicationTest.cpp
index 0a1b6655e..97fdb18c0 100644
--- a/src/Magnum/Platform/Test/GlfwApplicationTest.cpp
+++ b/src/Magnum/Platform/Test/GlfwApplicationTest.cpp
@@ -30,6 +30,15 @@ namespace Magnum { namespace Platform { namespace Test { namespace {
 struct GlfwApplicationTest: Platform::Application {
     explicit GlfwApplicationTest(const Arguments& arguments): Platform::Application{arguments} {}
 
+    /* For testing HiDPI resize events */
+    void viewportEvent(ViewportEvent& event) override {
+        Debug{} << "viewport event" << event.windowSize()
+            #ifdef MAGNUM_TARGET_GL
+            << event.framebufferSize()
+            #endif
+            << event.dpiScaling();
+    }
+
     void keyPressEvent(KeyEvent& event) override {
         #if GLFW_VERSION_MAJOR*100 + GLFW_VERSION_MINOR >= 302
         Debug{} << "key press event:" << event.keyName();
diff --git a/src/Magnum/Platform/Test/Sdl2ApplicationTest.cpp b/src/Magnum/Platform/Test/Sdl2ApplicationTest.cpp
index 02b6bff63..688fc39db 100644
--- a/src/Magnum/Platform/Test/Sdl2ApplicationTest.cpp
+++ b/src/Magnum/Platform/Test/Sdl2ApplicationTest.cpp
@@ -42,7 +42,11 @@ struct Sdl2ApplicationTest: Platform::Application {
 
     /* For testing HiDPI resize events */
     void viewportEvent(ViewportEvent& event) override {
-        Debug{} << "viewport event" << event.windowSize() << event.framebufferSize() << event.dpiScaling();
+        Debug{} << "viewport event" << event.windowSize()
+            #ifdef MAGNUM_TARGET_GL
+            << event.framebufferSize()
+            #endif
+            << event.dpiScaling();
     }
 
     /* For testing event coordinates */