IndirectBuilder.h

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#pragma once
 
#include "graphics/GpuDrivenTypes.h"
 
#include <cstdint>
#include <vector>
#include <algorithm>
 
namespace eve::graphics {
 
class IndirectBuilder {
public:
    void reset();
 
    void add(uint32_t seq, uint32_t meshId, uint32_t materialId, uint32_t pipelineId);
 
    uint32_t build(const std::vector<GpuMeshRecord> &meshTable);
 
    const std::vector<uint32_t> &sortedInstanceOrder() const { return order_; }
 
    const std::vector<GpuIndirectCommand> &commands() const { return commands_; }
    uint32_t drawCount() const { return uint32_t(commands_.size()); }
 
private:
    struct Entry {
        uint64_t key = 0;
        uint32_t seq = 0;
        uint32_t meshId = kInvalidGpuDrivenSlot;
        uint32_t materialId = kInvalidGpuDrivenSlot;
        uint32_t pipelineId = 0;
    };
 
    static uint64_t makeKey(uint32_t seq, uint32_t meshId, uint32_t materialId,
                            uint32_t pipelineId) {
        return (uint64_t(pipelineId & 0xFF) << 56) |
               (uint64_t(materialId & 0xFFFF) << 40) |
               (uint64_t(meshId & 0xFFFF) << 24) | (seq & 0xFFFFFF);
    }
 
    std::vector<Entry> entries_;
    std::vector<uint32_t> order_;
    std::vector<GpuIndirectCommand> commands_;
};
 
}  // namespace eve::graphics