72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package d2dt1
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const (
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blockDataLength = 256
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)
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// DecodeTileGfxData decodes tile graphics data for a slice of dt1 blocks
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func DecodeTileGfxData(blocks []Block, pixels *[]byte, tileYOffset, tileWidth int32) {
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for _, block := range blocks {
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if block.Format() == BlockFormatIsometric {
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// 3D isometric decoding
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xjump := []int32{14, 12, 10, 8, 6, 4, 2, 0, 2, 4, 6, 8, 10, 12, 14}
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nbpix := []int32{4, 8, 12, 16, 20, 24, 28, 32, 28, 24, 20, 16, 12, 8, 4}
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blockX := int32(block.X)
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blockY := int32(block.Y)
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length := int32(blockDataLength)
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x := int32(0)
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y := int32(0)
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idx := 0
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for length > 0 {
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x = xjump[y]
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n := nbpix[y]
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length -= n
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for n > 0 {
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offset := ((blockY + y + tileYOffset) * tileWidth) + (blockX + x)
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(*pixels)[offset] = block.EncodedData[idx]
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x++
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n--
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idx++
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}
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y++
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}
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continue
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}
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// RLE Encoding
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blockX := int32(block.X)
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blockY := int32(block.Y)
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x := int32(0)
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y := int32(0)
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idx := 0
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length := block.Length
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for length > 0 {
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b1 := block.EncodedData[idx]
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b2 := block.EncodedData[idx+1]
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idx += 2
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length -= 2
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if (b1 | b2) == 0 {
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x = 0
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y++
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continue
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}
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x += int32(b1)
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length -= int32(b2)
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for b2 > 0 {
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offset := ((blockY + y + tileYOffset) * tileWidth) + (blockX + x)
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(*pixels)[offset] = block.EncodedData[idx]
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idx++
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x++
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b2--
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}
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}
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}
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}
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