[client] egl: rework post process filters and add AMD FXR

client/renderers/EGL/shader/desktop.vert

@@ -3,11 +3,11 @@
 layout(location = 0) in vec2 vertex;
 out highp vec2 uv;
 
-uniform highp vec2 size;
+uniform highp vec2 desktopSize;
 uniform mat3x2 transform;
 
 void main()
 {
   gl_Position = vec4(transform * vec3(vertex, 1.0), 0.0, 1.0);
-  uv = vertex / size;
+  uv = vertex / desktopSize;
 }