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Selects potentially-correct interrupt times.

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This commit is contained in:
Thomas Harte 2018-10-11 21:42:09 -04:00
parent 82b7944599
commit 6a94dda60d
1 changed files with 10 additions and 8 deletions
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18
Components/9918/9918.cpp
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@ -63,10 +63,9 @@ Base::Base(Personality p) :
}
if(is_sega_vdp(personality_)) {
mode_timing_.line_interrupt_position = 4;
mode_timing_.end_of_frame_interrupt_position.column = 296;
mode_timing_.end_of_frame_interrupt_position.row = 191;
mode_timing_.line_interrupt_position = 65;
mode_timing_.end_of_frame_interrupt_position.column = 63;
mode_timing_.end_of_frame_interrupt_position.row = 193;
}
}
@ -314,7 +313,7 @@ void TMS9918::run_for(const HalfCycles cycles) {
// it is reloaded either when it overflows or upon every non-pixel line after the first.
// It is otherwise decremented.
if(is_sega_vdp(personality_)) {
if(row_ <= mode_timing_.pixel_lines) {
if(row_ > 0 && row_ <= mode_timing_.pixel_lines+1) {
--line_interrupt_counter;
if(line_interrupt_counter == 0xff) {
line_interrupt_pending_ = true;
@ -508,7 +507,7 @@ void TMS9918::set_register(int address, uint8_t value) {
break;
default:
printf("Unknown TMS write: %d to %d\n", low_write_, value);
// printf("Unknown TMS write: %d to %d\n", low_write_, value);
break;
}
} else {
@ -523,11 +522,14 @@ void TMS9918::set_register(int address, uint8_t value) {
}
uint8_t TMS9918::get_current_line() {
int source_row = (column_ < mode_timing_.line_interrupt_position) ? (row_ + mode_timing_.total_lines - 1)%mode_timing_.total_lines : row_;
// Determine the row to return.
static const int row_change_position = 62; // This is the proper Master System value; substitute if any other VDPs turn out to have this functionality.
int source_row = (column_ < row_change_position) ? (row_ + mode_timing_.total_lines - 1)%mode_timing_.total_lines : row_;
// This assumes NTSC 192-line. TODO: other modes.
if(source_row >= 0xdb) source_row -= 6;
// printf("Current row: %d -> %d\n", row_, source_row);
return static_cast<uint8_t>(source_row);
/*