VirtualGeometryAsset.h

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#pragma once
 
#include <cstdint>
#include <vector>
 
namespace eve::virtualgeometry {
 
struct VgGpuCluster {
    std::uint32_t u0[4];
    std::uint32_t u1[4];
    std::uint32_t u2[4];
    std::uint32_t u3[4];
};
 
struct VgCluster {
    float cx = 0.f, cy = 0.f, cz = 0.f, r = 0.f;  // bounding sphere
    std::uint32_t triStart = 0, triCount = 0;     // global triangle stream range
    std::uint32_t vertStart = 0, vertCount = 0;   // global position range used
    std::uint32_t lodLevel = 0;
    float errorR = 0.f;        // world-space geometric error radius
    float errorRScreen = 0.f;  // screen-space error constant (precomputed)
    std::uint32_t parent = 0xFFFFFFFFu;  // 0xFFFFFFFF = root
    std::uint32_t children[4] = {0xFFFFFFFFu, 0xFFFFFFFFu, 0xFFFFFFFFu, 0xFFFFFFFFu};
    std::uint32_t childCount = 0;
};
 
struct VirtualGeometryAsset {
    int vertexCount = 0;
    std::vector<float> positions;    // xyz packed, size = 3 * vertexCount
    std::vector<float> normals;      // optional xyz packed
 
    std::vector<std::uint32_t> triangles;
 
    std::vector<VgCluster> clusters;
 
    // Precomputed projection-dependent constant cache (recomputed on setCamera).
    float lastErrorScale = 1.f;
 
    int totalTriangles() const { return static_cast<int>(triangles.size() / 3); }
};
 
}  // namespace eve::virtualgeometry