Pass SDL_WINDOW_ALLOW_HIGHDPI to SDL_CreateWindow (#10125)

distribution/changelog.txt

@@ -33,6 +33,7 @@
 - Fix: [#10106]: Ride circuits should not be used for modes that do not support it.
 - Improved: [#9466] Add the rain weather effect to the OpenGL renderer.
 - Improved: [#9987] Minimum load rounding.
+- Improved: [#10125] Better support for high DPI screens.
 
 0.2.3 (2019-07-10)
 ------------------------------------------------------------------------

src/openrct2-ui/UiContext.cpp

@@ -639,7 +639,7 @@ private:
             height = 480;
 
         // Create window in window first rather than fullscreen so we have the display the window is on first
-        uint32_t flags = SDL_WINDOW_RESIZABLE;
+        uint32_t flags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI;
         if (gConfigGeneral.drawing_engine == DRAWING_ENGINE_OPENGL)
         {
             flags |= SDL_WINDOW_OPENGL;

src/openrct2-ui/drawing/engines/opengl/OpenGLFramebuffer.cpp

@@ -23,7 +23,7 @@ OpenGLFramebuffer::OpenGLFramebuffer(SDL_Window* window)
     _id = BACKBUFFER_ID;
     _texture = 0;
     _depth = 0;
-    SDL_GetWindowSize(window, &_width, &_height);
+    SDL_GL_GetDrawableSize(window, &_width, &_height);
 }
 
 OpenGLFramebuffer::OpenGLFramebuffer(int32_t width, int32_t height, bool depth, bool integer)