mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-10-04 03:02:10 +02:00
397b9c4505
Changelog:
- Added S-DSP emulation
- Added sound output support via DirectSound -- no sound buffering though, so sound is muted by default
- Added option to record raw sound output to WAV files
- Added multiple color adjustment filters to the video output
- Added mode3/4 direct color support
- Added mode7 direct color and mosaic support
- Greatly improved mode7 rendering algorithm thanks to anomie
- Fixed mode7 screen repitition and EXTBG effects
- Greatly increased accuracy of NMI and IRQ timing, and emulated many newly discovered hardware quirks involving the two
- A few speed improvements courtesy of Nach for profiling the code for me
I'm now looking for assistance with sound buffering. Specifically, I need help modifying the DirectSound code to allow the emulator to be ran between 50%-400% normal speed, while keeping the sound output relatively good. If you have experience with this and can help, please get in touch with me (setsunakun0 at hotmail dot com).
71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
/*
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[IRQ cycles]
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[1] pbr,pc ; opcode
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[2] pbr,pc ; io
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[3] 0,s ; pbr
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[4] 0,s-1 ; pch
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[5] 0,s-2 ; pcl
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[6] 0,s-3 ; p
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[7] 0,va ; aavl
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[8] 0,va+1 ; aavh
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*/
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void bCPU::irq(uint16 addr) {
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//WDC documentation is incorrect, first cycle
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//is a memory read fetch from PBR:PC
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add_cycles(mem_bus->speed(regs.pc.d));
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add_cycles(6);
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stack_write(regs.pc.b);
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stack_write(regs.pc.h);
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stack_write(regs.pc.l);
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stack_write(regs.p);
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rd.l = op_read(OPMODE_ADDR, addr);
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rd.h = op_read(OPMODE_ADDR, addr + 1);
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regs.pc.b = 0x00;
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regs.pc.w = rd.w;
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regs.p.i = 1;
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regs.p.d = 0;
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//let debugger know the new IRQ opcode address
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snes->notify(SNES::CPU_EXEC_OPCODE_END);
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}
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bool bCPU::nmi_test() {
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if(time.nmi_transition == 0)return false;
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time.nmi_transition = 0;
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if(status.cpu_state == CPUSTATE_WAI) {
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status.cpu_state = CPUSTATE_RUN;
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}
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return true;
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}
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bool bCPU::irq_test() {
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if(time.irq_transition == 1)goto _true;
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if(time.irq_read == 0) {
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if(time.irq_line == 1 && (irq_trigger_pos_match(0) || irq_trigger_pos_match(2))) {
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return false;
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}
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goto _true;
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}
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if(time.irq_line == 0) {
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time.irq_line = 1;
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goto _true;
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}
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return false;
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_true:
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time.irq_transition = 0;
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if(status.cpu_state == CPUSTATE_WAI) {
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status.cpu_state = CPUSTATE_RUN;
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}
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if(regs.p.i)return false;
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return true;
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}
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