go/chip8-emulator
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from color to index

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This commit is contained in:
Jairinho 2022-03-01 18:51:46 -03:00
parent 71b44655b7
commit 18d4d7f843
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GPG Key ID: 954589B18A21D5B6
1 changed files with 3 additions and 3 deletions
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6
chip8/instructions.go
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@ -213,13 +213,13 @@ func (emulator *Emulator) Draw(x uint8, y uint8, n uint8) {
for xline := uint8(0); xline < width; xline++ {
if (sprite & 0b10000000) != 0x00 {
px, py := int(x+xline)%Width, int(y+yline)%Height
color := emulator.Display.PixOffset(px, py) + 1 // color offset: 0:red, 1:green, 2:blue
index := emulator.Display.PixOffset(px, py) + 1 // color offset: 0:red, 1:green, 2:blue
if emulator.Display.Pix[color] != 0x00 {
if emulator.Display.Pix[index] != 0x00 {
emulator.V[0xF] = 0x01 // collision
}
emulator.Display.Pix[color] ^= 0xFF
emulator.Display.Pix[index] ^= 0xFF
}
sprite <<= 1
}