// BVLE Voxels - Smooth Surface Nets Vertex Shader (Phase 5.1)
// Vertex pulling from StructuredBuffer<SmoothVertex>.
// Each vertex is 32 bytes: float3 pos, float3 normal, uint matPacked, uint16 chunkIndex.

#include "voxelCommon.hlsli"

struct SmoothVtx {
    float3 position;    // world-space position (chunk origin already added)
    float3 normal;      // face normal
    uint   matPacked;   // materialID(8) | secondaryMat(8) | blendWeight(8) | pad(8)
    uint   chunkIndex;  // packed: chunkIndex in low 16 bits
};

StructuredBuffer<SmoothVtx> smoothVertices : register(t6);

struct VSOutput {
    float4 position : SV_POSITION;
    float3 worldPos : WORLDPOS;
    float3 normal   : NORMAL;
    nointerpolation uint matPacked : MATERIALID;
};

[RootSignature(VOXEL_ROOTSIG)]
VSOutput main(uint vertexID : SV_VertexID) {
    SmoothVtx vtx = smoothVertices[vertexID];

    VSOutput output;
    output.position  = mul(viewProjection, float4(vtx.position, 1.0));
    output.worldPos  = vtx.position;
    output.normal    = vtx.normal;
    output.matPacked = vtx.matPacked; // pass all packed material data to PS
    return output;
}