mirror of https://github.com/bsnes-emu/bsnes.git
82 lines
1.5 KiB
C++
82 lines
1.5 KiB
C++
struct Background {
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struct ID { enum { BG1, BG2, BG3, BG4 }; };
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unsigned id;
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struct Mode { enum { BPP2, BPP4, BPP8, Mode7, Inactive }; };
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struct ScreenSize { enum { Size32x32, Size32x64, Size64x32, Size64x64 }; };
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struct TileSize { enum { Size8x8, Size16x16 }; };
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struct Screen { enum { Main, Sub }; };
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struct Regs {
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uint16 tiledata_addr;
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uint16 screen_addr;
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uint2 screen_size;
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uint4 mosaic;
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bool tile_size;
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unsigned mode;
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unsigned priority0;
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unsigned priority1;
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bool main_enable;
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bool sub_enable;
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uint16 hoffset;
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uint16 voffset;
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} regs;
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struct Cache {
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uint16 hoffset;
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uint16 voffset;
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} cache;
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unsigned voffset() const;
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unsigned hoffset() const;
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struct Output {
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struct Pixel {
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unsigned priority; //0 = none (transparent)
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uint8 palette;
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uint16 tile;
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} main, sub;
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} output;
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struct Mosaic : Output::Pixel {
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unsigned vcounter;
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unsigned voffset;
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unsigned hcounter;
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unsigned hoffset;
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} mosaic;
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struct {
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signed x;
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signed y;
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unsigned tile_counter;
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unsigned tile;
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unsigned priority;
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unsigned palette_number;
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unsigned palette_index;
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uint8 data[8];
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};
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void frame();
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void scanline();
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void begin();
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void run(bool screen);
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void reset();
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void get_tile();
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unsigned get_tile_color();
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unsigned get_tile(unsigned x, unsigned y);
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signed clip(signed n);
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void begin_mode7();
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void run_mode7();
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void serialize(serializer&);
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Background(PPU& self, unsigned id);
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PPU& self;
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friend class PPU;
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};
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