51 lines
1.4 KiB
C++
Executable File
51 lines
1.4 KiB
C++
Executable File
#ifdef PPU_CPP
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//wrappers to allow PPUcounter::tick()/tock() to be inlined
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bool PPUcounter::region() const { return snes.region() == SNES::NTSC ? 0 : 1; }
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bool PPUcounter::interlace() const { return ppu.interlace(); }
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void PPUcounter::scanline() { cpu.scanline(); }
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//one PPU dot = 4 CPU clocks
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//
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//PPU dots 323 and 327 are 6 CPU clocks long.
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//this does not apply to NTSC non-interlace scanline 240 on odd fields. this is
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//because the PPU skips one dot to alter the color burst phase of the video signal.
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//
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//dot 323 range = { 1292, 1294, 1296 }
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//dot 327 range = { 1310, 1312, 1314 }
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uint16 PPUcounter::hdot() const {
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if(region() == 0 && interlace() == false && status.vcounter == 240 && status.field == 1) {
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return (status.hcounter >> 2);
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} else {
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return (status.hcounter - ((status.hcounter > 1292) << 1) - ((status.hcounter > 1310) << 1)) >> 2;
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}
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}
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uint16 PPUcounter::lineclocks() const {
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if(region() == 0 && interlace() == false && vcounter() == 240 && status.field == 1) return 1360;
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return 1364;
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}
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uint16 PPUcounter::ilineclocks() const {
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if(region() == 0 && interlace() == false && ivcounter() == 240 && status.field == 1) return 1360;
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return 1364;
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}
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void PPUcounter::reset() {
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status.field = 0;
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status.vcounter = 0;
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status.hcounter = 0;
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history.index = 0;
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history.ppudiff = 0;
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for(unsigned i = 0; i < 2048; i++) {
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history.field [i] = 0;
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history.vcounter[i] = 0;
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history.hcounter[i] = 0;
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}
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}
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#endif
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