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Apply modulos at end of line, not beginning.

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This commit is contained in:
Thomas Harte 2022-07-30 10:27:53 -04:00
parent 93d2a612ee
commit 27b8c29096
1 changed files with 11 additions and 7 deletions
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18
Machines/Amiga/Blitter.cpp
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@ -351,21 +351,25 @@ bool Blitter::advance_dma() {
// If this is the start of a new iteration, check for end of line,
// or of blit, and pick an appropriate mask for A based on location.
if(next.second != loop_index_) {
transient_a_mask_ = 0xffff;
if(x_ == 0) transient_a_mask_ &= a_mask_[0];
if(x_ == width_ - 1) transient_a_mask_ &= a_mask_[1];
transient_a_mask_ = x_ ? 0xffff : a_mask_[0];
// Check whether a complete row was completed in the previous iteration.
// If so then add modulos.
if(!x_ && y_) {
pointer_[0] += modulos_[0] * channel_enables_[0] * direction_;
pointer_[1] += modulos_[1] * channel_enables_[1] * direction_;
pointer_[2] += modulos_[2] * channel_enables_[2] * direction_;
pointer_[3] += modulos_[3] * channel_enables_[3] * direction_;
}
++x_;
if(x_ == width_) {
transient_a_mask_ &= a_mask_[1];
x_ = 0;
++y_;
if(y_ == height_) {
sequencer_.complete();
}
pointer_[0] += modulos_[0] * channel_enables_[0] * direction_;
pointer_[1] += modulos_[1] * channel_enables_[1] * direction_;
pointer_[2] += modulos_[2] * channel_enables_[2] * direction_;
pointer_[3] += modulos_[3] * channel_enables_[3] * direction_;
}
++loop_index_;
}