85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
|
/**
|
||
|
|
* @ Version: SCREEN SPACE SHADERS - UPDATE 12.5
|
||
|
|
* @ Description: Debanding implementation
|
||
|
|
* @ Modified time: 2022-11-23 15:47
|
||
|
|
* @ Author: https://www.moddb.com/members/ascii1457
|
||
|
|
* @ Mod: https://www.moddb.com/mods/stalker-anomaly/addons/screen-space-shaders
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "screenspace_common.h"
|
||
|
|
#include "settings_screenspace_DEBAND.h"
|
||
|
|
|
||
|
|
// Internal vars
|
||
|
|
static const float dband_threshold = 0.039215f;
|
||
|
|
|
||
|
|
static const float2 dband_dir_Offsets[4] =
|
||
|
|
{
|
||
|
|
float2( 1, 1), // XOX
|
||
|
|
float2(-1,-1), // O0O
|
||
|
|
float2(-1, 1), // XOX
|
||
|
|
float2( 1,-1)
|
||
|
|
};
|
||
|
|
|
||
|
|
void dband_process(inout float3 color, float2 tc, float noise, float2 dir, float loop_step)
|
||
|
|
{
|
||
|
|
// Some vars
|
||
|
|
float3 sampled_pixel;
|
||
|
|
float3 diff;
|
||
|
|
float3 avg = 0, max_diff = 0;
|
||
|
|
|
||
|
|
float pixel_factor = loop_step / G_DEBANDING_QUALITY;
|
||
|
|
|
||
|
|
// Radius for the sample
|
||
|
|
float radius = noise * (G_DEBANDING_RADIUS * pixel_factor * pixel_factor) * ssfx_pixel_size;
|
||
|
|
|
||
|
|
// Sample 4 points arround the original pixel
|
||
|
|
[unroll (4)]
|
||
|
|
for (int taps = 0; taps <= 4; taps++)
|
||
|
|
{
|
||
|
|
// Sample pixel
|
||
|
|
sampled_pixel = s_image.Sample(smp_linear, tc + radius * (dir * dband_dir_Offsets[taps])).rgb;
|
||
|
|
|
||
|
|
// Add to the average
|
||
|
|
avg += sampled_pixel;
|
||
|
|
|
||
|
|
// Difference between original pixel and sampled pixel
|
||
|
|
diff = abs(color - sampled_pixel);
|
||
|
|
|
||
|
|
// From the 4 samples save the biggest difference
|
||
|
|
max_diff = max(max_diff, diff);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Normalize average
|
||
|
|
avg /= 4.0f;
|
||
|
|
|
||
|
|
// Difference between original pixel and average
|
||
|
|
diff = abs(color - avg);
|
||
|
|
|
||
|
|
// Calc how much the pixel difference is close to our threshold.
|
||
|
|
float3 threshold = saturate((1.0 - diff / dband_threshold) * 3.0f) * saturate((1.0 - max_diff / dband_threshold) * 3.0f);
|
||
|
|
|
||
|
|
// We use the original pixel or average?
|
||
|
|
color = lerp(color, avg, threshold);
|
||
|
|
}
|
||
|
|
|
||
|
|
float3 ssfx_debanding(float3 color, float2 tc)
|
||
|
|
{
|
||
|
|
// Noise
|
||
|
|
float db_noise = SSFX_permute(SSFX_permute(SSFX_permute(tc.x) + tc.y) + noise(tc));
|
||
|
|
|
||
|
|
// Get random direction [ -1 ~ 1 ]
|
||
|
|
float2 dir = float2(cos(db_noise), sin(db_noise));
|
||
|
|
|
||
|
|
[unroll (G_DEBANDING_QUALITY)]
|
||
|
|
for (int loop_cnt = 1; loop_cnt <= G_DEBANDING_QUALITY; loop_cnt++)
|
||
|
|
{
|
||
|
|
// More variaton for each iteration
|
||
|
|
db_noise = SSFX_permute(db_noise);
|
||
|
|
|
||
|
|
// Process image
|
||
|
|
dband_process(color, tc, db_noise * 0.0033f, dir, loop_cnt);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Return result
|
||
|
|
return color;
|
||
|
|
}
|