VoxelPack.h

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#pragma once
 
#include <cstdint>
 
namespace eve::voxel {
 
constexpr int kChunkSize = 32;
 
struct PackedRect {
    uint32_t bits = 0;
 
    static PackedRect pack(int x, int y, int z, int width, int height, int tex) {
        PackedRect r;
        r.bits = (uint32_t(x) & 31u) | ((uint32_t(y) & 31u) << 5) | ((uint32_t(z) & 31u) << 10) |
                 ((uint32_t(width - 1) & 31u) << 15) | ((uint32_t(height - 1) & 31u) << 20) |
                 ((uint32_t(tex) & 127u) << 25);
        return r;
    }
 
    int x() const { return int(bits & 31u); }
    int y() const { return int((bits >> 5) & 31u); }
    int z() const { return int((bits >> 10) & 31u); }
    int width() const { return int((bits >> 15) & 31u) + 1; }
    int height() const { return int((bits >> 20) & 31u) + 1; }
    int tex() const { return int((bits >> 25) & 127u); }
};
 
static_assert(sizeof(PackedRect) == 4, "PackedRect must be 32-bit");
 
}  // namespace eve::voxel