add resolution uniform for pp, 16bit uses this for reducing screen resolution (wtf?)

Data/User/Shaders/README.txt

@@ -1,11 +1,14 @@
 //dummy shader:
-uniform samplerRECT samp0 : register(s0);
+uniform sampler2D samp9;
 
-void main(out float4 ocol0 : COLOR0, in float2 uv0 : TEXCOORD0)
+out vec4 ocol0;
+in vec2 uv0;
+
+void main()
 {
-  float4 c0 = texRECT(samp0, uv0).rgba;
-  ocol0 = float4(c0.r, c0.g, c0.b, c0.a);
+  ocol0 = texture(samp9, uv0);
 }
+
 /*
 And now that's over with, the contents of this readme file!
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