mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-10-05 08:11:51 +02:00
7dec0b2a3c
This version adds speed regulation, greatly improves PPU rendering, and increases speed by ~30% over the previous version.
Changelog:
- Rewrote offset-per-tile mode emulation, should be correct now. Fixes Chrono Trigger, Contra III, Tetris Attack, etc.
- Fixed a bug with HDMA occuring during interrupts. Fixes Tales of Phantasia souond test screen
- Updated compiler to Visual Studio 2005, and enabled profile guided optimizations
- Added conditional compilation of debugging functions (faster without them)
- Added conditional compilation of core classes as pointers (allowing polymorphism) or objects (allowing inlining). The latter results in a speed increase
- Small fixes to BG and OAM rendering routines
- Corrected sprite tile bounds wrapping
- Corrected sprite rendering in hires video modes
- Rewrote color add/sub routines, should be correct now. Fixes Illusion of Gaia menu, etc.
- Optimized video blitting routines, will temporarilly break mixed video mode screenshots
- Prevented selecting menu options via return key from being recognized as keypresses by the emulator
- Added system speed regulation (60hz/NTSC or 50hz/PAL)! Many thanks to kode54, GIGO, and Richard Bannister for their assistance
I disabled the debugger and polymorphism, and enabled profile guided optimizations for this build, to maximize speed. The debugger and polymorphism can be re-enabled via uncommenting the respective #defines in src/base.h and recompiling, or bsnes v0.013 can be used. I may start releasing two separate builds in the future... not sure yet.
70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*
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[IRQ cycles]
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[0] pbr,pc ; opcode
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[1] pbr,pc ; io
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[2] 0,s ; pbr
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[3] 0,s-1 ; pch
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[4] 0,s-2 ; pcl
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[5] 0,s-3 ; p
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[6] 0,va ; aavl
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[7] 0,va+1 ; aavh
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*/
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void bCPU::irq_run() {
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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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switch(status.cycle_pos++) {
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case 0: add_cycles(r_mem->speed(regs.pc.d)); break;
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case 1: add_cycles(6); break;
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case 2: stack_write(regs.pc.b); break;
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case 3: stack_write(regs.pc.h); break;
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case 4: stack_write(regs.pc.l); break;
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case 5: stack_write(regs.p); break;
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case 6: rd.l = op_read(OPMODE_ADDR, aa.w); break;
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case 7: rd.h = op_read(OPMODE_ADDR, aa.w + 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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#ifdef DEBUGGER
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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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#endif
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status.cycle_pos = 0;
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run_state.irq = false;
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break;
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}
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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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run_state.wai = false;
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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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run_state.wai = false;
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if(regs.p.i)return false;
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return true;
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}
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