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Makes bad first attempt at a Bresenham inner loop.

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This commit is contained in:
Thomas Harte 2021-09-27 22:06:00 -04:00
parent f6624bf776
commit cb460de94d
1 changed files with 27 additions and 2 deletions
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29
Machines/Amiga/Blitter.cpp
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@ -143,10 +143,35 @@ bool Blitter::advance() {
int error = int(pointer_[0]) * line_sign_;
while(height_--) {
ram_[pointer_[3] & ram_mask_] = 0x8000 >> shifts_[0];
// Assumed for now: quadrant 0.
// plot(x, y)
c_ = ram_[pointer_[3] & ram_mask_];
ram_[pointer_[3] & ram_mask_] =
apply_minterm<uint16_t>(
a_ >> shifts_[0],
0xffff, // TODO: b_ & (0x8000 >> shifts_[1]) but not that.
c_, minterms_);
shifts_[1] = (shifts_[1] + 1) & 15;
// Assumed for now: direction 0.
pointer_[3] += modulos_[2];
if(error > 0) {
++shifts_[0];
if(shifts_[0] == 16) {
shifts_[0] = 0;
++pointer_[3];
}
error -= modulos_[0] - modulos_[1];
}
error += modulos_[1];
// plot(x, y)
// if error > 0 {
// ++y
// error -= 2*dx
// }
// d += 2*dy
}
// ram_[pointer_[3] & ram_mask_] = 0xffff;
} else {