luboslenco
43 lines
979 B
Plaintext
43 lines
979 B
Plaintext
#[set(everything)]
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const tex: tex2d;
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#[set(everything)]
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const tex_sampler: sampler;
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struct vert_in {
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pos: float2;
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}
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struct vert_out {
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pos: float4;
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tex: float2;
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}
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const auto_exposure_speed: float = 1.0;
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fun histogram_pass_vert(input: vert_in): vert_out {
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var output: vert_out;
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output.tex = input.pos.xy * 0.5 + 0.5;
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output.tex.y = 1.0 - output.tex.y;
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output.pos = float4(input.pos.xy, 0.0, 1.0);
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return output;
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}
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fun histogram_pass_frag(input: vert_out): float4 {
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var color: float4;
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color.a = 0.01 * auto_exposure_speed;
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color.rgb = sample_lod(tex, tex_sampler, float2(0.5, 0.5), 0.0).rgb +
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sample_lod(tex, tex_sampler, float2(0.2, 0.2), 0.0).rgb +
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sample_lod(tex, tex_sampler, float2(0.8, 0.2), 0.0).rgb +
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sample_lod(tex, tex_sampler, float2(0.2, 0.8), 0.0).rgb +
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sample_lod(tex, tex_sampler, float2(0.8, 0.8), 0.0).rgb;
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color.rgb /= 5.0;
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return color;
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}
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#[pipe]
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struct pipe {
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vertex = histogram_pass_vert;
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fragment = histogram_pass_frag;
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}
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