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Limits graphical output to [all but one bit] of the display window.

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This commit is contained in:
Thomas Harte 2021-10-25 14:12:23 -07:00
parent e6001e0f22
commit 9f3efb7f05
1 changed files with 9 additions and 8 deletions
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17
Machines/Amiga/Chipset.cpp
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@ -152,10 +152,9 @@ template <int cycle> void Chipset::output() {
LINK(burst, output_default_colour_burst, burst - blank2); // TODO: only if colour enabled.
LINK(blank3, output_blank, blank3 - burst);
// TODO: these shouldn't be functions of the fetch window,
// but of the display window.
display_horizontal_ |= cycle == fetch_window_[0];
display_horizontal_ &= cycle != fetch_window_[1];
// TODO: incorporate the lowest display window bits elsewhere.
display_horizontal_ |= cycle == (display_window_start_[0] >> 1);
display_horizontal_ &= cycle != (display_window_stop_[0] >> 1);
if constexpr (cycle > blank3) {
const bool is_pixel_display = display_horizontal_ && fetch_vertical_;
@ -691,24 +690,26 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
const uint16_t value = cycle.value16();
display_window_start_[0] = value & 0xff;
display_window_start_[1] = value >> 8;
LOG("Display window start set to " << std::dec << display_window_start_[0] << ", " << display_window_start_[1]);
} break;
case Write(0x090): {
const uint16_t value = cycle.value16();
display_window_stop_[0] = 0x100 | (value & 0xff);
display_window_stop_[1] = value >> 8;
display_window_stop_[1] |= ((value >> 7) & 0x100) ^ 0x100;
LOG("Display window stop set to " << std::dec << display_window_stop_[0] << ", " << display_window_stop_[1]);
} break;
case Write(0x092):
if(fetch_window_[0] != cycle.value16()) {
LOG("Fetch window start set to " << std::dec << cycle.value16());
}
fetch_window_[0] = cycle.value16();
LOG("Fetch window start set to " << std::dec << fetch_window_[0]);
break;
case Write(0x094):
// TODO: something in my interpretation of ddfstart and ddfstop
// means a + 8 is needed below for high-res displays. Investigate.
if(fetch_window_[1] != cycle.value16() + 8) {
LOG("Fetch window stop set to " << std::dec << fetch_window_[1]);
}
fetch_window_[1] = cycle.value16() + 8;
LOG("Fetch window stop set to " << std::dec << fetch_window_[1]);
break;
// Bitplanes.