GpuParticleBuffer.hpp

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#pragma once
 
#include <SDL3/SDL.h>
 
#include <cstdint>

class GpuParticleBuffer
{
public:
    enum class Mode
    {
        Storage,
        Vertex
    };

    void init(SDL_GPUDevice* dev, uint32_t maxBytes, Mode mode = Mode::Storage);

    void quit();

    void upload(SDL_GPUCommandBuffer* cmd, const void* data, uint32_t count, uint32_t stride);

    void bindAsVertexStorage(SDL_GPURenderPass* pass, uint32_t slot) const;

    void bindAsVertex(SDL_GPURenderPass* pass) const;
 
    [[nodiscard]] uint32_t liveCount() const { return liveCount_; }
    [[nodiscard]] uint32_t capacityBytes() const { return capacity_; }
 
private:
    SDL_GPUDevice* device_ = nullptr;
    SDL_GPUBuffer* gpuBuf_ = nullptr;
    SDL_GPUTransferBuffer* transfer_ = nullptr;
    uint32_t capacity_ = 0;  
    uint32_t liveCount_ = 0; 
};