20 lines
886 B
HLSL
20 lines
886 B
HLSL
Texture2D<float4> xe_texture : register(t0);
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Texture1D<float3> xe_gamma_ramp : register(t1);
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SamplerState xe_sampler_linear_clamp : register(s0);
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cbuffer XeStretchGammaRootConstants : register(b0) {
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float xe_gamma_ramp_inv_size;
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};
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float4 main(float2 xe_texcoord : TEXCOORD) : SV_Target {
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float4 color =
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xe_texture.SampleLevel(xe_sampler_linear_clamp, xe_texcoord, 0.0f);
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// The center of the first texel of the LUT contains the value for 0, and the
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// center of the last texel contains the value for 1.
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color.rgb = color.rgb * (1.0f - xe_gamma_ramp_inv_size) +
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(0.5 * xe_gamma_ramp_inv_size);
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color.r = xe_gamma_ramp.SampleLevel(xe_sampler_linear_clamp, color.r, 0.0f).r;
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color.g = xe_gamma_ramp.SampleLevel(xe_sampler_linear_clamp, color.g, 0.0f).g;
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color.b = xe_gamma_ramp.SampleLevel(xe_sampler_linear_clamp, color.b, 0.0f).b;
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return color;
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}
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