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Makes first attempt to support PAL timings.

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This commit is contained in:
Thomas Harte 2018-10-19 21:36:13 -04:00
parent fa77d81813
commit f9a6c00493
2 changed files with 23 additions and 3 deletions
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24
Components/9918/9918.cpp
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@ -21,6 +21,11 @@ const uint8_t StatusSpriteOverflow = 0x40;
const int StatusSpriteCollisionShift = 5;
const uint8_t StatusSpriteCollision = 0x20;
// 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
const unsigned int CRTCyclesPerLine = 1365;
const unsigned int CRTCyclesDivider = 4;
struct ReverseTable {
std::uint8_t map[256];
@ -44,9 +49,7 @@ struct ReverseTable {
Base::Base(Personality p) :
personality_(p),
// 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
crt_(new Outputs::CRT::CRT(1365, 4, Outputs::CRT::DisplayType::NTSC60, 4)) {
crt_(new Outputs::CRT::CRT(CRTCyclesPerLine, CRTCyclesDivider, Outputs::CRT::DisplayType::NTSC60, 4)) {
switch(p) {
case TI::TMS::TMS9918A:
@ -98,6 +101,21 @@ TMS9918::TMS9918(Personality p):
crt_->set_immediate_default_phase(0.85f);
}
void TMS9918::set_tv_standard(TVStandard standard) {
switch(standard) {
case TVStandard::PAL:
mode_timing_.total_lines = 313;
mode_timing_.first_vsync_line = 253;
crt_->set_new_display_type(CRTCyclesPerLine, Outputs::CRT::DisplayType::PAL50);
break;
default:
mode_timing_.total_lines = 262;
mode_timing_.first_vsync_line = 227;
crt_->set_new_display_type(CRTCyclesPerLine, Outputs::CRT::DisplayType::NTSC60);
break;
}
}
Outputs::CRT::CRT *TMS9918::get_crt() {
return crt_.get();
}

2
Components/9918/9918.hpp
View File

@ -66,8 +66,10 @@ class TMS9918: public Base {
/*! Gets the current scan line; provided by the Master System only. */
uint8_t get_current_line();
/*! Gets the current latched horizontal counter; provided by the Master System only. */
uint8_t get_latched_horizontal_counter();
/*! Latches the current horizontal counter. */
void latch_horizontal_counter();
/*!