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Fix sprite bit ordering.

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This commit is contained in:
Thomas Harte 2021-10-22 21:10:01 -07:00
parent 7ec21edc2f
commit 2121e32409
1 changed files with 6 additions and 6 deletions
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12
Machines/Amiga/Chipset.cpp
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@ -205,7 +205,7 @@ template <int cycle> void Chipset::output() {
// QUICK HACK: dump sprite pixels:
//
// (i) always on top, regardless of current priority;
// (ii) assuming two-colour sprites; and
// (ii) assuming four-colour sprites; and
// (iii) not using the proper triggering mechanism.
//
// (and assuming visible area is a subset of the fetch area, but elsewhere
@ -220,8 +220,8 @@ template <int cycle> void Chipset::output() {
};
const int colours[] = {
int((pixels[0] >> 31) | ((pixels[1] >> 30) & 2)),
int(((pixels[0] >> 30)&1) | ((pixels[1] >> 29) & 2))
int((pixels[1] >> 31) | ((pixels[0] >> 30) & 2)),
int(((pixels[1] >> 30)&1) | ((pixels[0] >> 29) & 2))
};
const int base = ((c&~1) << 1) + 16;
@ -606,7 +606,7 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
case Read(0x00a):
case Read(0x00c):
// LOG("TODO: Joystick/mouse position " << PADHEX(4) << *cycle.address);
cycle.set_value16(0x8080);
cycle.set_value16(0x0000);
break;
case Write(0x034):
@ -711,9 +711,9 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
LOG("Fetch window start set to " << std::dec << fetch_window_[0]);
break;
case Write(0x094):
// TODO: something in my interpretation of ddfstart and ddfend
// TODO: something in my interpretation of ddfstart and ddfstop
// means a + 8 is needed below for high-res displays. Investigate.
fetch_window_[1] = cycle.value16();
fetch_window_[1] = cycle.value16() + 8;
LOG("Fetch window stop set to " << std::dec << fetch_window_[1]);
break;