bgprint.h

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#include <b8/ppu.h>
#pragma once
namespace bgprint {
  enum EnCmd{
    SET_SLOT_CONTEXT,
    SET_UV_SCROLL,
    EXPORT_PPU_CMD,
    GET_INFO
  };
 
  enum EnCh {
    CH0,
    CH1,
    CH2,
    CH3,
    CH4,
    CH5,
    CH6,
    CH7,
    /* --- */
    CHMAX
  };
 
  struct UvScroll {
    int _u = 0;
    int _v = 0;
  };
 
  struct Context {
    b8PpuBgTile* cpuaddr = nullptr;
 
    u16 _w_pow2   = 4;
 
    u16 _h_pow2   = 5;
 
    u16 _h_disp   = 30;
 
    bool  _scroll = true;
  };
 
  struct ExportPpuCmd {
    b8PpuCmd* _cmd = nullptr;
    u32 _otz = 0;
  };
 
  void  Reset();
 
  FILE* Open(
    EnCh ch_,
    char* buff,
    size_t buffsize,
    bgprint::Context& ctx
  );
 
  void  SetUvScroll(
    FILE* fp_,
    const bgprint::UvScroll& uv_
  );
 
  void  Export(
    FILE* fp_,
    const bgprint::ExportPpuCmd& epc
  );
 
  void  Locate(FILE* fp_ ,s16 lx_,s16 ly_ );
  void  Pal(FILE* fp_, u8 pal_ );
  struct Info {
    s16 _x_locate = 0;   
    s16 _y_locate = 0;   
    u8  _pal;
  };
  int GetInfo(FILE* fp_, Info& dest);
}