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Corrects multicolour text mode.

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This commit is contained in:
Thomas Harte 2018-10-18 20:25:42 -04:00
parent 0278d5b61c
commit 8ff265c3a1
2 changed files with 9 additions and 7 deletions
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1
Components/9918/9918.cpp
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@ -605,7 +605,6 @@ HalfCycles Base::half_cycles_before_internal_cycles(int internal_cycles) {
return HalfCycles(((internal_cycles << 2) - cycles_error_) / 3);
}
HalfCycles TMS9918::get_time_until_interrupt() {
if(!generate_interrupts_ && !enable_line_interrupts_) return HalfCycles(-1);
if(get_interrupt_line()) return HalfCycles(0);

15
Components/9918/Implementation/9918Base.hpp
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@ -554,7 +554,7 @@ class Base {
LineBuffer &line_buffer = line_buffers_[write_pointer_.row];
LineBuffer &sprite_selection_buffer = line_buffers_[(write_pointer_.row + 1) % mode_timing_.total_lines];
const size_t row_base = pattern_name_address_ & (static_cast<size_t>((write_pointer_.row << 2)&~31) | 0x3c00);
const size_t row_base = pattern_name_address_ & (size_t((write_pointer_.row << 2)&~31) | 0x3c00);
size_t pattern_base = pattern_generator_table_address_;
size_t colour_base = colour_table_address_;
@ -562,17 +562,20 @@ class Base {
if(screen_mode_ == ScreenMode::Graphics) {
// If this is high resolution mode, allow the row number to affect the pattern and colour addresses.
pattern_base &= static_cast<size_t>(0x2000 | ((write_pointer_.row & 0xc0) << 5));
colour_base &= static_cast<size_t>(0x2000 | ((write_pointer_.row & 0xc0) << 5));
pattern_base &= size_t(0x2000 | ((write_pointer_.row & 0xc0) << 5));
colour_base &= size_t(0x2000 | ((write_pointer_.row & 0xc0) << 5));
colour_base += static_cast<size_t>(write_pointer_.row & 7);
colour_base += size_t(write_pointer_.row & 7);
colour_name_shift = 0;
} else {
colour_base &= size_t(0xffc0 | (write_pointer_.row & 7));
pattern_base &= size_t(0x3800);
}
if(screen_mode_ == ScreenMode::MultiColour) {
pattern_base += static_cast<size_t>((write_pointer_.row >> 2) & 7);
pattern_base += size_t((write_pointer_.row >> 2) & 7);
} else {
pattern_base += static_cast<size_t>(write_pointer_.row & 7);
pattern_base += size_t(write_pointer_.row & 7);
}
switch(start) {