Fix OpenGL display scaling on high DPI (#1011)

* Fix OpenGL display scaling on high DPI

* Scale the OSD too

* Fix indent

1 files changed, 3 insertions, 2 deletions

diff --git a/src/frontend/qt_sdl/main_shaders.h b/src/frontend/qt_sdl/main_shaders.h
index c55f79e..da5a22a 100644
--- a/src/frontend/qt_sdl/main_shaders.h
+++ b/src/frontend/qt_sdl/main_shaders.h
@@ -23,6 +23,7 @@ const char* kScreenVS = R"(#version 140
 
 uniform vec2 uScreenSize;
 uniform mat2x3 uTransform;
+uniform float uScaleFactor;
 
 in vec2 vPosition;
 in vec2 vTexcoord;
@@ -33,9 +34,9 @@ void main()
 {
     vec4 fpos;
 
-    fpos.xy = vec3(vPosition, 1.0) * uTransform;
+    fpos.xy = vec3(vPosition, 1.0) * uTransform * uScaleFactor;
 
-    fpos.xy = ((fpos.xy * 2.0) / uScreenSize) - 1.0;
+    fpos.xy = ((fpos.xy * 2.0) / (uScreenSize * uScaleFactor)) - 1.0;
     fpos.y *= -1;
     fpos.z = 0.0;
     fpos.w = 1.0;