src/demos/hdr/shaders/cg/shrink.cg


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// downsample float image by half

#include "hdr.cg"

half4 main(fragin In,
	   uniform samplerRECT sceneTex : TEXUNIT0
           ) : COLOR
{
    // should calculate texcoords in vertex shader here:
    half4 c;
    c = texRECT(sceneTex, In.tex0.xy);
    c = c + texRECT(sceneTex, In.tex0.xy + float2(1, 0));
    c = c + texRECT(sceneTex, In.tex0.xy + float2(0, 1));
    c = c + texRECT(sceneTex, In.tex0.xy + float2(1, 1));
    c = c * 0.25;
    return c;
}