95 lines
3 KiB
HLSL
95 lines
3 KiB
HLSL
#include "common.hlsli"
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struct vf
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{
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float4 hpos : POSITION;
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float2 tbase : TEXCOORD0; // base
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float2 tnorm0 : TEXCOORD1; // nm0
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float2 tnorm1 : TEXCOORD2; // nm1
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float3 M1 : TEXCOORD3;
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float3 M2 : TEXCOORD4;
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float3 M3 : TEXCOORD5;
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float3 v2point : TEXCOORD6;
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float4 tctexgen : TEXCOORD7;
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float4 c0 : COLOR0;
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};
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uniform sampler2D s_nmap;
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uniform samplerCUBE s_env0;
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uniform samplerCUBE s_env1;
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uniform sampler2D s_leaves;
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uniform float4 pos_decompression_params;
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#if defined(USE_SOFT_WATER) && defined(NEED_SOFT_WATER)
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float3 water_intensity;
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#endif // defined(USE_SOFT_WATER) && defined(NEED_SOFT_WATER)
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float4 main(vf I) : COLOR
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{
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float4 base = tex2D(s_base, I.tbase);
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float3 n0 = tex2D(s_nmap, I.tnorm0);
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float3 n1 = tex2D(s_nmap, I.tnorm1);
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float3 Navg = n0 + n1 - 1.0f;
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float3 Nw = mul(float3x3(I.M1, I.M2, I.M3), Navg);
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Nw = normalize(Nw);
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float3 v2point = normalize(I.v2point);
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float3 vreflect = reflect(v2point, Nw);
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float fresnel = saturate(dot(vreflect, v2point));
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// true remapping. Slow.
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float3 vreflectabs = abs(vreflect);
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float vreflectmax = max(vreflectabs.x, max(vreflectabs.y, vreflectabs.z));
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vreflect /= vreflectmax;
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vreflect.y = vreflect.y * 2 - 1;
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float3 env0 = texCUBE(s_env0, vreflect);
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float3 env1 = texCUBE(s_env1, vreflect);
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float3 env = lerp(env0, env1, L_ambient.w);
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env *= env * L_sky_color.xyz;
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float power = pow(fresnel, 9.0f);
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float amount = 0.25f + 0.55f * power;
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float3 c_reflection = env * amount;
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float3 final = lerp(c_reflection, base.rgb, base.a);
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#ifdef NEED_SOFT_WATER
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float alpha = 0.75f + 0.25f * power;
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// Igor: additional depth test
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#ifdef USE_SOFT_WATER
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float4 _P = tex2Dproj(s_position, I.tctexgen);
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float2 PosTc = I.tctexgen.xy / I.tctexgen.w;
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float3 waterPos = float3((PosTc * 2 - 1) * pos_decompression_params.xy, 1) * I.tctexgen.z;
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float waterDepth = length(waterPos - _P) * 0.75f;
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// water fog
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float3 Fc = float3(0.1f, 0.1f, 0.1f) * water_intensity.r;
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final = lerp(Fc, final, alpha);
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alpha = min(alpha, saturate(waterDepth));
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alpha = max(1.0f - exp(-4.0f * waterDepth), alpha);
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// Leaves
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float4 leaves = tex2D(s_leaves, I.tbase);
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leaves.rgb *= water_intensity.r;
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float calc_cos = -dot(float3(I.M1.z, I.M2.z, I.M3.z), normalize(v2point));
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float calc_depth = saturate(waterDepth * calc_cos);
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float fLeavesFactor = smoothstep(0.025f, 0.05f, calc_depth);
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fLeavesFactor *= smoothstep(0.1f, 0.075f, calc_depth);
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final = lerp(final, leaves, leaves.a * fLeavesFactor);
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alpha = lerp(alpha, leaves.a, leaves.a * fLeavesFactor);
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#endif // USE_SOFT_WATER
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final *= I.c0;
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return lerp(float4(final, alpha), fog_color, 1.0f - calc_fogging(I.v2point + eye_position));
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#else // NEED_SOFT_WATER
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return lerp(float4(final, 1.0f), fog_color, 1.0f - calc_fogging(I.v2point + eye_position));
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#endif // NEED_SOFT_WATER
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}
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