85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/**
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* @ Version: SCREEN SPACE SHADERS - UPDATE 12.5
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* @ Description: Debanding implementation
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* @ Modified time: 2022-11-23 15:47
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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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#include "screenspace_common.h"
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#include "settings_screenspace_DEBAND.h"
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// Internal vars
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static const float dband_threshold = 0.039215f;
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static const float2 dband_dir_Offsets[4] =
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{
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float2( 1, 1), // XOX
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float2(-1,-1), // O0O
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float2(-1, 1), // XOX
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float2( 1,-1)
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};
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void dband_process(inout float3 color, float2 tc, float noise, float2 dir, float loop_step)
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{
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// Some vars
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float3 sampled_pixel;
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float3 diff;
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float3 avg = 0, max_diff = 0;
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float pixel_factor = loop_step / G_DEBANDING_QUALITY;
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// Radius for the sample
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float radius = noise * (G_DEBANDING_RADIUS * pixel_factor * pixel_factor) * ssfx_pixel_size;
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// Sample 4 points arround the original pixel
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[unroll (4)]
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for (int taps = 0; taps <= 4; taps++)
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{
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// Sample pixel
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sampled_pixel = s_image.Sample(smp_linear, tc + radius * (dir * dband_dir_Offsets[taps])).rgb;
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// Add to the average
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avg += sampled_pixel;
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// Difference between original pixel and sampled pixel
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diff = abs(color - sampled_pixel);
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// From the 4 samples save the biggest difference
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max_diff = max(max_diff, diff);
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}
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// Normalize average
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avg /= 4.0f;
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// Difference between original pixel and average
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diff = abs(color - avg);
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// Calc how much the pixel difference is close to our threshold.
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float3 threshold = saturate((1.0 - diff / dband_threshold) * 3.0f) * saturate((1.0 - max_diff / dband_threshold) * 3.0f);
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// We use the original pixel or average?
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color = lerp(color, avg, threshold);
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}
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float3 ssfx_debanding(float3 color, float2 tc)
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{
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// Noise
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float db_noise = SSFX_permute(SSFX_permute(SSFX_permute(tc.x) + tc.y) + noise(tc));
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// Get random direction [ -1 ~ 1 ]
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float2 dir = float2(cos(db_noise), sin(db_noise));
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[unroll (G_DEBANDING_QUALITY)]
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for (int loop_cnt = 1; loop_cnt <= G_DEBANDING_QUALITY; loop_cnt++)
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{
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// More variaton for each iteration
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db_noise = SSFX_permute(db_noise);
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// Process image
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dband_process(color, tc, db_noise * 0.0033f, dir, loop_cnt);
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}
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// Return result
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return color;
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} |