52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
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/**
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* @ Version: SCREEN SPACE SHADERS - UPDATE 12.5
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* @ Description: Main file - Noise
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* @ Modified time: 2022-11-23 14:22
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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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float4 SSFX_mod289(float4 x)
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{
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return x - floor(x / 289.0f) * 289.0f;
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}
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float4 SSFX_permute(float4 x)
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{
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return SSFX_mod289((x * 34.0f + 1.0f) * x);
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}
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float SSFX_noise(float2 tc)
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{
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float2 noise = frac(tc.xy * 0.5f);
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return noise.x + noise.y * 0.5f;
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}
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float2 SSFX_noise2(float2 p)
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{
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p = p % 289;
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float x = (34 * p.x + 1) * p.x % 289 + p.y;
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x = (34 * x + 1) * x % 289;
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x = frac(x / 41) * 2 - 1;
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return normalize(float2(x - floor(x + 0.5), abs(x) - 0.5));
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}
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float SSFX_gradient_noise_IGN(float2 uv)
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{
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// IGN
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uv = frac(uv);
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float f = 0.06711056 * uv.x + 0.00583715 * uv.y;
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return frac(52.9829189 * frac(f));
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}
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float SSFX_gradientNoise(float2 p)
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{
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float2 ip = floor(p);
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float2 fp = frac(p);
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float d00 = dot(SSFX_noise2(ip), fp);
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float d01 = dot(SSFX_noise2(ip + float2(0, 1)), fp - float2(0, 1));
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float d10 = dot(SSFX_noise2(ip + float2(1, 0)), fp - float2(1, 0));
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float d11 = dot(SSFX_noise2(ip + float2(1, 1)), fp - float2(1, 1));
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fp = fp * fp * fp * (fp * (fp * 6 - 15) + 10);
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return lerp(lerp(d00, d01, fp.y), lerp(d10, d11, fp.y), fp.x);
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}
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