54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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/**
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* @ Version: SCREEN SPACE SHADERS - UPDATE 20
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* @ Description: LUT shader
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* @ Modified time: 2024-01-22 04:12
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* @ Author: https://www.moddb.com/members/ascii1457
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* @ Mod: https://www.moddb.com/mods/stalker-anomaly/addons/screen-space-shaders
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*/
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// Settings
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#include "settings_screenspace_LUT.h"
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// Internal --
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#define LUT_GROUPS max(1, G_CELLS_GROUPS)
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#define TEXEL_SIZE float2(1.0f / G_LUT_SIZE_W, 1.0f / (G_CELLS_SIZE * LUT_GROUPS))
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#define TEXEL_HALF float2(TEXEL_SIZE.xy / 2.0f)
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#define TEXEL_FIX TEXEL_SIZE.y * LUT_GROUPS
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uniform float4 ssfx_lut;
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float3 ssfx_lut_pp(float3 base_col)
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{
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// Prepare LUT UVs
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float3 cells = base_col * G_CELLS_SIZE - base_col;
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float lut_frac = frac(cells.b);
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cells.rg = TEXEL_HALF + cells.rg * TEXEL_SIZE;
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cells.r += (cells.b - lut_frac) * TEXEL_FIX;
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// Final LUT UVs
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float4 uvs = float4(cells.rg, cells.r + TEXEL_FIX, cells.g);
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// Group offset
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float2 grp_offset = float2(0.0, ssfx_lut.y / LUT_GROUPS);
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// Sample LUTs
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float3 lut_col = lerp( s_lut_atlas.Sample(smp_linear, uvs.xy + grp_offset).rgb,
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s_lut_atlas.Sample(smp_linear, uvs.zw + grp_offset).rgb,
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lut_frac);
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#ifdef G_ADVANCE_TRANSITION
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// Group2 offset
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grp_offset = float2(0.0, ssfx_lut.z / LUT_GROUPS);
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// Sample transition LUTs
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float3 SecondLUT = lerp(s_lut_atlas.Sample(smp_linear, uvs.xy + grp_offset).rgb,
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s_lut_atlas.Sample(smp_linear, uvs.zw + grp_offset).rgb,
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lut_frac);
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lut_col = lerp(lut_col, SecondLUT, ssfx_lut.w);
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#endif
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return lerp(base_col.rgb, lut_col.rgb, ssfx_lut.x);
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}
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