mirror of https://github.com/bsnes-emu/bsnes.git
116 lines
2.6 KiB
C++
116 lines
2.6 KiB
C++
#include <pce/pce.hpp>
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namespace PCEngine {
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VDC vdc0;
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VDC vdc1;
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#include "memory.cpp"
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#include "io.cpp"
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#include "irq.cpp"
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#include "dma.cpp"
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#include "background.cpp"
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#include "sprite.cpp"
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#include "serialization.cpp"
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auto VDC::Enter() -> void {
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while(true) {
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scheduler.synchronize();
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if(vdc0.active()) vdc0.main();
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if(vdc1.active()) vdc1.main();
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}
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}
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auto VDC::main() -> void {
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if(Model::PCEngine() && vdc1.active()) return step(frequency());
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if(timing.vclock == 0) {
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timing.voffset = 0;
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timing.vstart = max((uint8)2, timing.verticalDisplayStart) - 2;
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timing.vlength = min(242, timing.verticalDisplayLength + 1);
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}
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timing.hclock = 0;
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timing.hoffset = 0;
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timing.hstart = timing.horizontalDisplayStart;
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timing.hlength = (timing.horizontalDisplayLength + 1) << 3;
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if(timing.vclock >= timing.vstart && timing.voffset < timing.vlength) {
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background.scanline(timing.voffset);
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sprite.scanline(timing.voffset);
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step(timing.hstart);
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while(timing.hclock < 1360 && timing.hoffset < timing.hlength) {
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data = 0;
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background.run(timing.hoffset, timing.voffset);
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sprite.run(timing.hoffset, timing.voffset);
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if(sprite.color && sprite.priority) {
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data = 1 << 8 | sprite.palette << 4 | sprite.color << 0;
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} else if(background.color) {
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data = 0 << 8 | background.palette << 4 | background.color << 0;
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} else if(sprite.color) {
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data = 1 << 8 | sprite.palette << 4 | sprite.color << 0;
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}
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step(vce.clock());
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timing.hoffset++;
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}
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if(timing.voffset == io.lineCoincidence - 64) {
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irq.raise(IRQ::Line::LineCoincidence);
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}
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timing.voffset++;
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}
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data = 0;
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step(1365 - timing.hclock);
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if(timing.vclock == timing.vstart + timing.vlength) {
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irq.raise(IRQ::Line::Vblank);
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dma.satbStart();
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}
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if(++timing.vclock == 262) {
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timing.vclock = 0;
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}
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}
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auto VDC::scanline() -> void {
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timing.hpulse = true;
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}
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auto VDC::frame() -> void {
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timing.vpulse = true;
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}
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auto VDC::step(uint clocks) -> void {
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Thread::step(clocks);
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synchronize(cpu);
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synchronize(vce);
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timing.hclock += clocks;
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dma.step(clocks);
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}
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auto VDC::power() -> void {
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create(VDC::Enter, system.colorburst() * 6.0);
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memory::fill(&vram, sizeof(VRAM));
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memory::fill(&satb, sizeof(SATB));
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memory::fill(&timing, sizeof(Timing));
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memory::fill(&irq, sizeof(IRQ));
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memory::fill(&dma, sizeof(DMA));
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memory::fill(&io, sizeof(IO));
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memory::fill(&background, sizeof(Background));
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memory::fill(&sprite, sizeof(Sprite));
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dma.vdc = this;
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background.vdc = this;
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sprite.vdc = this;
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}
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}
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