Platform: ability to request sRGB-capable framebuffer in Sdl2Application.

src/Magnum/Platform/Sdl2Application.cpp

@@ -105,6 +105,11 @@ bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
     SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, configuration.sampleCount() > 1 ? 1 : 0);
     SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, configuration.sampleCount());
 
+    #ifndef CORRADE_TARGET_EMSCRIPTEN
+    /* sRGB */
+    SDL_GL_SetAttribute(SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, configuration.isSRGBCapable());
+    #endif
+
     /* Flags: if not hidden, set as shown */
     Uint32 windowFlags(configuration.windowFlags());
     if(!(configuration.windowFlags() & Configuration::WindowFlag::Hidden))
@@ -413,7 +418,7 @@ Sdl2Application::Configuration::Configuration():
     #endif
     _size(800, 600), _windowFlags{}, _sampleCount(0)
     #ifndef CORRADE_TARGET_EMSCRIPTEN
-    , _version(Version::None)
+    , _version(Version::None), _sRGBCapable{false}
     #endif
     {}
 

src/Magnum/Platform/Sdl2Application.h

@@ -719,6 +719,27 @@ class Sdl2Application::Configuration {
             return *this;
         }
 
+        #ifndef CORRADE_TARGET_EMSCRIPTEN
+        /**
+         * @brief sRGB-capable default framebuffer
+         *
+         * @note Not available in @ref CORRADE_TARGET_EMSCRIPTEN "Emscripten".
+         */
+        bool isSRGBCapable() const { return _sRGBCapable; }
+
+        /**
+         * @brief Set sRGB-capable default framebuffer
+         * @return Reference to self (for method chaining)
+         *
+         * Default is `false`. See also @ref Renderer::Feature::FramebufferSRGB.
+         * @note Not available in @ref CORRADE_TARGET_EMSCRIPTEN "Emscripten".
+         */
+        Configuration& setSRGBCapable(bool enabled) {
+            _sRGBCapable = enabled;
+            return *this;
+        }
+        #endif
+
     private:
         #ifndef CORRADE_TARGET_EMSCRIPTEN
         std::string _title;
@@ -729,6 +750,7 @@ class Sdl2Application::Configuration {
         #ifndef CORRADE_TARGET_EMSCRIPTEN
         Version _version;
         Flags _flags;
+        bool _sRGBCapable;
         #endif
 };