Samuel Bouchet
ef89bd8c49
Stone: add corner fill triangles at adjacent open edges and cap triangles at strip terminaisons. Grass: replace bevel strips with tuft-based grass blades — clusters of 3-9 curved double-sided blades with per-tuft height/lean personality and hash-driven placement (quadratic inset 0-0.30 from edge). Vegetation PS uses half-Lambert wrap lighting + translucency for soft stylized shading (inspired by Airborn Trees). Stone keeps classic Lambert.
70 lines
3 KiB
HLSL
70 lines
3 KiB
HLSL
// BVLE Voxels - Toping Pixel Shader (Phase 4.2)
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// Simplified version of voxelPS: triplanar texture sampling + basic lighting.
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// No height-based blending (topings are small decorative meshes).
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#include "voxelCommon.hlsli"
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Texture2DArray<float4> materialTextures : register(t1);
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SamplerState texSampler : register(s0);
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struct PSInput {
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float4 position : SV_POSITION;
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float3 worldPos : WORLDPOS;
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float3 normal : NORMAL;
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nointerpolation uint materialID : MATERIALID;
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};
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[RootSignature(VOXEL_ROOTSIG)]
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float4 main(PSInput input) : SV_TARGET0 {
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float3 N = normalize(input.normal);
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float tiling = textureTiling;
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// Material texture index (materialID 1-5 → array layer 0-4)
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uint texIdx = clamp(input.materialID - 1u, 0u, 4u);
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// Triplanar sampling (same as voxel PS)
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float3 blend = abs(N);
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blend = blend / (blend.x + blend.y + blend.z + 0.001);
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float4 xSample = materialTextures.Sample(texSampler, float3(input.worldPos.yz * tiling, (float)texIdx));
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float4 ySample = materialTextures.Sample(texSampler, float3(input.worldPos.xz * tiling, (float)texIdx));
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float4 zSample = materialTextures.Sample(texSampler, float3(input.worldPos.xy * tiling, (float)texIdx));
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float3 texColor = (xSample.rgb * blend.x + ySample.rgb * blend.y + zSample.rgb * blend.z);
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float3 L = normalize(-sunDirection.xyz);
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float rawNdotL = dot(N, L);
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// ── Material-dependent lighting ─────────────────────────────
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// Stone (materialID=3): standard diffuse like voxel faces
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// Vegetation (grass etc.): stylized wrap lighting + translucency
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// inspired by Airborn Trees (simonschreibt.de/gat/airborn-trees/)
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float3 lit;
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if (input.materialID == 3u) {
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// Stone: classic Lambert + cool ambient (matches voxel PS)
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float NdotL = max(rawNdotL, 0.0);
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float3 ambient = float3(0.15, 0.18, 0.25);
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lit = texColor * (sunColor.rgb * NdotL + ambient);
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} else {
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// ── Vegetation: soft wrap lighting ──────────────────────
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// Half-Lambert: wraps light around the surface, no hard terminator
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float halfLambert = rawNdotL * 0.5 + 0.5;
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float wrap = halfLambert * halfLambert; // squared for falloff shape
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// Translucency: thin blades let light through from behind
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// Simple SSS approximation: light arriving from the back side
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float3 V = normalize(cameraPosition.xyz - input.worldPos);
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float backLight = saturate(dot(V, L)); // view aligned with light = backlit
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float transAmount = (1.0 - saturate(rawNdotL)) * 0.4; // stronger when facing away from light
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float translucency = backLight * transAmount;
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// Warm vegetation ambient (higher than stone, slightly green-tinted)
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float3 vegAmbient = float3(0.22, 0.28, 0.20);
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float3 diffuse = sunColor.rgb * (wrap * 0.7 + translucency * 0.5);
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lit = texColor * (diffuse + vegAmbient);
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}
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return float4(lit, 1.0);
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}
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