92 lines
2.3 KiB
HLSL
92 lines
2.3 KiB
HLSL
#include "common.hlsli"
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#undef USE_ULTRA_SHADOWS
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#define RAY_PATH 2.0h
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#define JITTER_TEXTURE_SIZE 64.0f
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#define JITTER_SUN_SHAFTS
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#ifdef SUN_SHAFTS_QUALITY
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#if SUN_SHAFTS_QUALITY == 1
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// #define FILTER_LOW
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#define RAY_SAMPLES 20
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#elif SUN_SHAFTS_QUALITY == 2
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// #define FILTER_LOW
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#define RAY_SAMPLES 20
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#elif SUN_SHAFTS_QUALITY == 3
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// #define FILTER_LOW
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#define RAY_SAMPLES 40
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#endif
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#endif
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#include "shadow.hlsli"
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float4 volume_range; // x - near plane, y - far plane
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float4 sun_shafts_intensity;
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float4 main(v2p_TL I) : SV_Target
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{
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#ifndef SUN_SHAFTS_QUALITY
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return float4(0, 0, 0, 0);
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#else // SUN_SHAFTS_QUALITY
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IXrayGbuffer O;
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GbufferUnpack(I.Tex0.xy, I.HPos.xy, O);
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float3 P = O.Point;
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#ifndef JITTER_SUN_SHAFTS
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// Fixed ray length, fixed step dencity
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// float3 direction = (RAY_PATH/RAY_SAMPLES)*normalize(P);
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// Variable ray length, variable step dencity
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float3 direction = P / RAY_SAMPLES;
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#else // JITTER_SUN_SHAFTS
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// Variable ray length, variable step dencity, use jittering
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float4 J0 = jitter0.Sample(smp_jitter, I.HPos.xy / JITTER_TEXTURE_SIZE);
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float coeff = (RAY_SAMPLES - J0.x) / (RAY_SAMPLES * RAY_SAMPLES);
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float3 direction = P * coeff;
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#endif // JITTER_SUN_SHAFTS
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float depth = P.z;
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float deltaDepth = direction.z;
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float4 current = mul(m_shadow, float4(P, 1.0f));
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float4 delta = mul(m_shadow, float4(direction, 0.0f));
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float res = 0.0f;
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float max_density = sun_shafts_intensity.x;
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float density = max_density / RAY_SAMPLES;
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if(O.Depth > 0.9999f) {
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depth = 0.0f;
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res = max_density;
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}
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[unroll] for(int i = 0; i < RAY_SAMPLES; ++i)
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{
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if (depth > 0.3)
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{
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#ifndef FILTER_LOW
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res += density * shadow(current);
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#else
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res += density * sample_hw_pcf(current, float4(0, 0, 0, 0));
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#endif
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}
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depth -= deltaDepth;
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current -= delta;
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}
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float fSturation = dot(normalize(P), -Ldynamic_dir.xyz);
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// Normalize dot product to
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fSturation = 0.4f * fSturation + 0.6f;
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float fog = saturate(length(P.xyz) * fog_params.w + fog_params.x);
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res = lerp(res, max_density, fog);
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res *= fSturation;
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return PushGamma(res * Ldynamic_color);
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#endif // SUN_SHAFTS_QUALITY
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}
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