50 lines
1.4 KiB
HLSL
50 lines
1.4 KiB
HLSL
#include "common.hlsli"
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#include "shared\waterconfig.hlsli"
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struct v2p
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{
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float2 tbase : TEXCOORD0; // base
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float2 tdist0 : TEXCOORD1; // d0
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float2 tdist1 : TEXCOORD2; // d1
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float4 tctexgen : TEXCOORD3;
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};
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uniform sampler2D s_distort;
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#define POWER .5h
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// Pixel
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float4 main(v2p I) : COLOR
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{
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float4 t_base = tex2D(s_base, I.tbase);
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float2 t_d0 = tex2D(s_distort, I.tdist0);
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float2 t_d1 = tex2D(s_distort, I.tdist1);
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float2 distort = (t_d0 + t_d1) * 0.5f; // average
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float2 zero = float2(0.5f, 0.5f);
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float2 faded = lerp(distort, zero, t_base.a);
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// Igor: additional depth test
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#ifdef USE_SOFT_WATER
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#ifdef NEED_SOFT_WATER
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float alphaDistort;
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float4 _P = tex2Dproj(s_position, I.tctexgen);
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float waterDepth = _P.z - I.tctexgen.z;
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alphaDistort = saturate(5 * waterDepth);
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faded = lerp(zero, faded, alphaDistort);
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#endif // NEED_SOFT_WATER
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#endif // USE_SOFT_WATER & NEED_SOFT_WATER
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float2 faded_bx2 = (faded * 2.0f - 1.0f) * W_DISTORT_POWER;
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float faded_dot = dot(float3(faded_bx2, 0.0f), 0.75f); // 0.75
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float alpha = 0.5f; // abs (faded_dot);
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faded = faded * POWER - .5 * POWER + 0.5;
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// out
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// Igor: need for alpha water
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#ifdef NEED_SOFT_WATER
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return float4(faded, 0.0f, alpha);
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#else // NEED_SOFT_WATER
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return float4(faded, 0.08f, alpha);
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#endif // NEED_SOFT_WATER
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}
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