Turánszki János
46 lines
1.7 KiB
HLSL
46 lines
1.7 KiB
HLSL
#include "globals.hlsli"
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#include "oceanSurfaceHF.hlsli"
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Texture2D<float4> texture_displacementmap : register(t0);
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PSIn main(uint vertexID : SV_VertexID)
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{
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PSIn Out;
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float2 dim = xOceanScreenSpaceParams.xy;
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float2 invdim = xOceanScreenSpaceParams.zw;
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uint2 grid_coord = unflatten2D(vertexID, dim.xy);
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// Assemble screen space grid:
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Out.pos = float4(grid_coord / float2(dim - 1), 1, 1);
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Out.pos.xy = uv_to_clipspace(Out.pos.xy);
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float4 originalpos = Out.pos;
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Out.pos.xy *= max(1, xOceanSurfaceDisplacementTolerance); // extrude screen space grid to tolerate displacement
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// Perform ray tracing of screen grid and plane surface to unproject to world space:
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float4 unprojNEAR = mul(GetCamera().inverse_view_projection, float4(Out.pos.xy, 1, 1));
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unprojNEAR.xyz /= unprojNEAR.w;
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float4 unprojFAR = mul(GetCamera().inverse_view_projection, float4(Out.pos.xy, 0, 1));
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unprojFAR.xyz /= unprojFAR.w;
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const float3 d = normalize(unprojNEAR.xyz - unprojFAR.xyz);
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const float3 o = unprojNEAR.xyz;
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float3 worldPos = intersectPlaneClampInfinite(o, d, float3(0, 1, 0), xOceanWaterHeight);
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float2 uv = worldPos.xz * xOceanPatchSizeRecip;
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if (grid_coord.x > 0 && grid_coord.x < dim.x - 1 && grid_coord.y > 0 && grid_coord.y < dim.y - 1) // don't displace the side edges, to avoid holes
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{
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// Displace surface:
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float3 displacement = texture_displacementmap.SampleLevel(sampler_linear_wrap, uv, 0).xzy;
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float dist = length(worldPos - GetCamera().position);
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displacement *= saturate(1 - saturate(dist / GetCamera().z_far - 0.8) * 5.0); // fade will be on edge and inwards 20%
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worldPos += displacement;
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}
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// Reproject displaced surface and output:
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Out.pos = mul(GetCamera().view_projection, float4(worldPos, 1));
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Out.uv = uv;
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return Out;
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}
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