82 lines
3.4 KiB
C
82 lines
3.4 KiB
C
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#pragma once
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#include "VoxelTypes.h"
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#include <vector>
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#include <cstdint>
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namespace voxel {
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class VoxelWorld;
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// ── Toping mesh vertex (position + normal) ──────────────────────
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struct TopingVertex {
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float px, py, pz; // position in voxel-local space [0,1]³
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float nx, ny, nz; // normal
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};
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// ── Reference to a slice of vertices in the shared pool ─────────
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struct MeshSlice {
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uint32_t offset; // first vertex index in TopingSystem::vertices_
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uint32_t count; // number of vertices (multiple of 3)
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};
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// ── Toping definition (one per decorative type) ─────────────────
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// Each def targets a specific material + face, and provides 16
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// mesh variants indexed by a 4-bit adjacency bitmask.
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//
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// Adjacency bitmask (for FACE_POS_Y):
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// bit 0 = +X neighbor has same material AND exposed +Y face
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// bit 1 = -X neighbor has same material AND exposed +Y face
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// bit 2 = +Z neighbor has same material AND exposed +Y face
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// bit 3 = -Z neighbor has same material AND exposed +Y face
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//
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// A SET bit means the neighbor IS present → no bevel on that edge.
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// An UNSET bit means the edge is "open" → bevel strip generated.
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struct TopingDef {
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uint8_t materialID; // voxel material that triggers this toping
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uint8_t face; // Face enum (FACE_POS_Y, etc.)
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float height; // bevel peak height (voxel units)
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float width; // bevel inward extent (voxel units)
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int segments; // subdivisions per edge strip (1=smooth, 3+=bumpy)
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MeshSlice variants[16]; // indexed by adjacency bitmask
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};
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// ── Placed toping instance ──────────────────────────────────────
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struct TopingInstance {
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float wx, wy, wz; // world position of the source voxel (integer coords)
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uint16_t topingType; // index into TopingSystem::defs_
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uint16_t variant; // adjacency bitmask (0-15)
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};
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// ── Toping System ───────────────────────────────────────────────
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// Manages toping definitions, procedural mesh generation, and
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// instance collection from the voxel world.
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//
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// Phase 4.1: data structures + mesh gen + collection (no rendering).
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// Phase 4.2 will upload vertices_ to a GPU vertex buffer and
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// instances_ to an instance buffer for instanced drawing.
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class TopingSystem {
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public:
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void initialize();
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void collectInstances(const VoxelWorld& world);
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// Accessors for Phase 4.2 GPU upload
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const std::vector<TopingVertex>& getVertices() const { return vertices_; }
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const std::vector<TopingInstance>& getInstances() const { return instances_; }
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const std::vector<TopingDef>& getDefs() const { return defs_; }
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size_t getDefCount() const { return defs_.size(); }
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size_t getInstanceCount() const { return instances_.size(); }
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size_t getVertexCount() const { return vertices_.size(); }
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private:
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void registerDefs();
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void generateMeshes();
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void generateVariant(TopingDef& def, uint8_t bitmask);
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std::vector<TopingDef> defs_;
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std::vector<TopingVertex> vertices_; // shared vertex pool for all types/variants
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std::vector<TopingInstance> instances_; // collected per frame/update
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};
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} // namespace voxel
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