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Makes first attempt to support PAL timings.
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@ -21,6 +21,11 @@ const uint8_t StatusSpriteOverflow = 0x40;
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const int StatusSpriteCollisionShift = 5;
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const uint8_t StatusSpriteCollision = 0x20;
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// 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
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// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
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const unsigned int CRTCyclesPerLine = 1365;
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const unsigned int CRTCyclesDivider = 4;
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struct ReverseTable {
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std::uint8_t map[256];
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@ -44,9 +49,7 @@ struct ReverseTable {
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Base::Base(Personality p) :
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personality_(p),
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// 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
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// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
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crt_(new Outputs::CRT::CRT(1365, 4, Outputs::CRT::DisplayType::NTSC60, 4)) {
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crt_(new Outputs::CRT::CRT(CRTCyclesPerLine, CRTCyclesDivider, Outputs::CRT::DisplayType::NTSC60, 4)) {
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switch(p) {
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case TI::TMS::TMS9918A:
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@ -98,6 +101,21 @@ TMS9918::TMS9918(Personality p):
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crt_->set_immediate_default_phase(0.85f);
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}
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void TMS9918::set_tv_standard(TVStandard standard) {
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switch(standard) {
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case TVStandard::PAL:
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mode_timing_.total_lines = 313;
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mode_timing_.first_vsync_line = 253;
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crt_->set_new_display_type(CRTCyclesPerLine, Outputs::CRT::DisplayType::PAL50);
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break;
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default:
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mode_timing_.total_lines = 262;
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mode_timing_.first_vsync_line = 227;
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crt_->set_new_display_type(CRTCyclesPerLine, Outputs::CRT::DisplayType::NTSC60);
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break;
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}
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}
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Outputs::CRT::CRT *TMS9918::get_crt() {
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return crt_.get();
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}
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@ -66,8 +66,10 @@ class TMS9918: public Base {
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/*! Gets the current scan line; provided by the Master System only. */
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uint8_t get_current_line();
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/*! Gets the current latched horizontal counter; provided by the Master System only. */
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uint8_t get_latched_horizontal_counter();
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/*! Latches the current horizontal counter. */
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void latch_horizontal_counter();
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/*!
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