TextureDownloader.cpp

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#include "TextureDownloader.hpp"
 
#include <stdexcept>
 
namespace sKit {
namespace SDL {
 
TextureDownloader::TextureDownloader(
    SDL_GPUDevice* device,
    SDL_GPUCopyPass* pass,
    SDL_GPUTexture* sourceTexture,
    Uint32 width,
    Uint32 height
)
    : device_(device) {
  auto info = SDL_GPUTransferBufferCreateInfo {
      .usage = SDL_GPU_TRANSFERBUFFERUSAGE_DOWNLOAD, .size = width * height * 4
  };
  buffer = SDL_CreateGPUTransferBuffer(device, &info);
  if (!buffer) {
    throw std::runtime_error("Could not create transfer buffer");
  }
  auto src = SDL_GPUTextureRegion {
      .texture = sourceTexture, .w = width, .h = height, .d = 1
  };
  auto dst = SDL_GPUTextureTransferInfo {
      .transfer_buffer = buffer,
  };
  SDL_DownloadFromGPUTexture(pass, &src, &dst);
}
 
TextureDownloader::~TextureDownloader() {
  SDL_UnmapGPUTransferBuffer(device_, buffer);
  SDL_ReleaseGPUTransferBuffer(device_, buffer);
}
 
auto TextureDownloader::getData() -> unsigned char* {
  return reinterpret_cast<unsigned char*>(
      SDL_MapGPUTransferBuffer(device_, buffer, false)
  );
}
 
}  // namespace SDL
}  // namespace sKit