mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-02-24 07:02:27 +01:00
0f78acffd7
byuu says:
Changelog:
- importing a game won't show message box on success
- importing a game will select the game that was imported in the list
- caveat: GTK+ port doesn't seem to be removing focus from item 0 even
though the selection is on item 2
- Game Boy audio reduced in volume by 50%
- Game Boy Advance audio reduced in volume by 50%
- Game Boy internally mixes audio at 2MHz now
- Game Boy Advance's Game Boy audio hardware internally mixes audio at
2MHz now
- Game Boy Color doesn't sort sprites by X-coordinate
- Game Boy Color allows transparency on BGpriority pixels
- caveat: this seems to allow sprites to appear on top of windows
- Game Boy Color VRAM DMA transfers 16 bytes in 8 clocks (or 16 clocks
in double speed mode)
- Game Boy Color VRAM DMA masks low 4-bits of source and destination
address
- Game Boy Color VRAM DMA only allows reads from ROM or RAM
- Game Boy Color VRAM DMA only allows writes to VRAM
- fixed a bug in dereferencing a nullptr from pObject::find(), should
fix crash when pressing enter key on blank windows
- fixed Windows RadioItem selection
- Game Boy Advance color emulation code added
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#include <gba/gba.hpp>
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namespace GameBoyAdvance {
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#include "registers.cpp"
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#include "mmio.cpp"
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#include "square.cpp"
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#include "square1.cpp"
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#include "square2.cpp"
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#include "wave.cpp"
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#include "noise.cpp"
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#include "sequencer.cpp"
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#include "fifo.cpp"
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#include "serialization.cpp"
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APU apu;
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void APU::Enter() {
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while(true) {
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if(scheduler.sync == Scheduler::SynchronizeMode::All) {
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scheduler.exit(Scheduler::ExitReason::SynchronizeEvent);
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}
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apu.main();
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}
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}
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void APU::main() {
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for(unsigned n = 0; n < 64; n++) {
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runsequencer();
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}
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signed lsample = regs.bias.level - 0x0200;
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signed rsample = regs.bias.level - 0x0200;
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//(4-bit x 4 -> 6-bit) + 3-bit volume = 9-bit output
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if(sequencer.masterenable) {
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signed lsequence = 0;
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if(sequencer.lenable[0]) lsequence += square1.output;
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if(sequencer.lenable[1]) lsequence += square2.output;
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if(sequencer.lenable[2]) lsequence += wave.output;
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if(sequencer.lenable[3]) lsequence += noise.output;
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signed rsequence = 0;
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if(sequencer.renable[0]) rsequence += square1.output;
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if(sequencer.renable[1]) rsequence += square2.output;
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if(sequencer.renable[2]) rsequence += wave.output;
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if(sequencer.renable[3]) rsequence += noise.output;
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if(sequencer.volume < 3) {
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lsample += lsequence * (sequencer.lvolume + 1) >> (2 - sequencer.volume);
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rsample += rsequence * (sequencer.rvolume + 1) >> (2 - sequencer.volume);
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}
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}
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//(8-bit x 2 -> 7-bit) + 1-bit volume = 10-bit output
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signed fifo0 = fifo[0].output + (1 << fifo[0].volume);
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signed fifo1 = fifo[1].output + (1 << fifo[1].volume);
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if(fifo[0].lenable) lsample += fifo0;
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if(fifo[1].lenable) lsample += fifo1;
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if(fifo[0].renable) rsample += fifo0;
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if(fifo[1].renable) rsample += fifo1;
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lsample = sclamp<10>(lsample);
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rsample = sclamp<10>(rsample);
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if(regs.bias.amplitude == 1) lsample &= ~3, rsample &= ~3;
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if(regs.bias.amplitude == 2) lsample &= ~7, rsample &= ~7;
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if(regs.bias.amplitude == 3) lsample &= ~15, rsample &= ~15;
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if(cpu.regs.mode == CPU::Registers::Mode::Stop) lsample = 0, rsample = 0;
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interface->audioSample(sclamp<16>(lsample << 6), sclamp<16>(rsample << 6)); //should be <<5, use <<6 for added volume
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step(512);
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}
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void APU::step(unsigned clocks) {
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clock += clocks;
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if(clock >= 0 && scheduler.sync != Scheduler::SynchronizeMode::All) co_switch(cpu.thread);
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}
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void APU::power() {
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create(APU::Enter, 16777216);
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square1.power();
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square2.power();
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wave.power();
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noise.power();
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sequencer.power();
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fifo[0].power();
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fifo[1].power();
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regs.bias = 0x0200;
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for(unsigned n = 0x060; n <= 0x0a7; n++) bus.mmio[n] = this;
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}
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}
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