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Corrects initial error value.

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This commit is contained in:
Thomas Harte 2021-09-29 22:19:17 -04:00
parent 0b9ebafc0f
commit 402fa41bc0
1 changed files with 2 additions and 4 deletions
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6
Machines/Amiga/Blitter.cpp
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@ -145,16 +145,14 @@ bool Blitter::advance() {
//
// Implementation below is heavily based on the documentation found
// at https://github.com/niklasekstrom/blitter-subpixel-line/blob/master/Drawing%20lines%20using%20the%20Amiga%20blitter.pdf
//
printf("!!! Line %08x\n", pointer_[3]);
int error = int(pointer_[0]) * line_sign_;
int error = int16_t(pointer_[0] << 1) >> 1; // TODO: what happens if line_sign_ doesn't agree with this?
bool draw_ = true;
while(height_--) {
if(draw_) {
c_ = ram_[pointer_[3] & ram_mask_];
// c_ |= a_ >> shifts_[0]; // TODO: there's an XOR mode, I think?
ram_[pointer_[3] & ram_mask_] =
apply_minterm<uint16_t>(a_ >> shifts_[0], b_, c_, minterms_);
draw_ &= !one_dot_;