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Fix border lengths.

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This commit is contained in:
Thomas Harte 2023-01-08 17:04:19 -05:00
parent cb19c2ffb0
commit b522d65c50
1 changed files with 26 additions and 19 deletions
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45
Components/9918/Implementation/9918.cpp
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@ -470,35 +470,42 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
}
template <Personality personality>
void Base<personality>::output_border(int cycles, uint32_t cram_dot) {
cycles *= 4;
void Base<personality>::output_border(int cycles, [[maybe_unused]] uint32_t cram_dot) {
cycles = this->clock_converter_.to_crt_clock(cycles);
const uint32_t border_colour =
is_sega_vdp(personality) ?
master_system_.colour_ram[16 + background_colour_] :
palette[background_colour_];
if(cram_dot) {
uint32_t *const pixel_target = reinterpret_cast<uint32_t *>(crt_.begin_data(1));
if(pixel_target) {
*pixel_target = border_colour | cram_dot;
}
crt_.output_level(4);
cycles -= 4;
}
if(cycles) {
// If the border colour is 0, that can be communicated
// more efficiently as an explicit blank.
if(border_colour) {
if constexpr (is_sega_vdp(personality)) {
if(cram_dot) {
uint32_t *const pixel_target = reinterpret_cast<uint32_t *>(crt_.begin_data(1));
if(pixel_target) {
*pixel_target = border_colour;
*pixel_target = border_colour | cram_dot;
}
crt_.output_level(cycles);
} else {
crt_.output_blank(cycles);
// Four CRT cycles is one pixel width, so this doesn't need clock conversion.
// TODO: on the Mega Drive it may be only 3 colour cycles, depending on mode.
crt_.output_level(4);
cycles -= 4;
}
}
if(!cycles) {
return;
}
// If the border colour is 0, that can be communicated
// more efficiently as an explicit blank.
if(border_colour) {
uint32_t *const pixel_target = reinterpret_cast<uint32_t *>(crt_.begin_data(1));
if(pixel_target) {
*pixel_target = border_colour;
}
crt_.output_level(cycles);
} else {
crt_.output_blank(cycles);
}
}
template <Personality personality>