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108 lines
2.8 KiB
108 lines
2.8 KiB
3 years ago
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#pragma once
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#include <cstdint>
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#define TILE_WIDTH 64
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#define TILE_HEIGHT 32
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namespace devilution {
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/**
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* Level tile type.
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*
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* The tile type determines data encoding and the shape.
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*
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* Each tile type has its own encoding but they all encode data in the order
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* of bottom-to-top (bottom row first).
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*/
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enum class TileType : uint8_t {
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/**
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* 🮆 A 32x32 square. Stored as an array of pixels.
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*/
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Square,
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/**
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* 🮆 A 32x32 square with transparency. RLE encoded.
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*
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* Each run starts with an int8_t value.
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* If positive, it is followed by this many pixels.
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* If negative, it indicates `-value` fully transparent pixels, which are omitted.
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*
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* Runs do not cross row boundaries.
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*/
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TransparentSquare,
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/**
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*🭮 Left-pointing 32x31 triangle. Encoded as 31 varying-width rows with 2 padding bytes before every even row.
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*
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* The smallest rows (bottom and top) are 2px wide, the largest row is 16px wide (middle row).
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*
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* Encoding:
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* for i in [0, 30]:
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* - 2 unused bytes if i is even
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* - row (only the pixels within the triangle)
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*/
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LeftTriangle,
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/**
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* 🭬Right-pointing 32x31 triangle. Encoded as 31 varying-width rows with 2 padding bytes after every even row.
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*
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* The smallest rows (bottom and top) are 2px wide, the largest row is 16px wide (middle row).
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*
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* Encoding:
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* for i in [0, 30]:
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* - row (only the pixels within the triangle)
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* - 2 unused bytes if i is even
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*/
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RightTriangle,
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/**
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* 🭓 Left-pointing 32x32 trapezoid: a 32x16 rectangle and the 16x16 bottom part of `LeftTriangle`.
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*
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* Begins with triangle part, which uses the `LeftTriangle` encoding,
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* and is followed by a flat array of pixels for the top rectangle part.
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*/
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LeftTrapezoid,
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/**
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* 🭞 Right-pointing 32x32 trapezoid: 32x16 rectangle and the 16x16 bottom part of `RightTriangle`.
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*
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* Begins with the triangle part, which uses the `RightTriangle` encoding,
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* and is followed by a flat array of pixels for the top rectangle part.
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*/
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RightTrapezoid,
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};
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/**
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* Specifies the current MIN block of the level CEL file, as used during rendering of the level tiles.
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*/
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struct LevelCelBlock {
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uint16_t data;
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[[nodiscard]] bool hasValue() const
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{
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return data != 0;
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}
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[[nodiscard]] TileType type() const
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{
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return static_cast<TileType>((data & 0x7000) >> 12);
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}
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/**
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* @brief Returns the 1-based index of the frame in `pDungeonCels`.
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*/
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[[nodiscard]] uint16_t frame() const
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{
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return data & 0xFFF;
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}
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};
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/** Width of a tile rendering primitive. */
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constexpr int_fast16_t DunFrameWidth = TILE_WIDTH / 2;
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/** Height of a tile rendering primitive (except triangles). */
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constexpr int_fast16_t DunFrameHeight = TILE_HEIGHT;
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} // namespace devilution
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