mirror of https://github.com/bsnes-emu/bsnes.git
75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
#ifdef SUPERFX_CPP
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auto SuperFX::step(unsigned clocks) -> void {
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if(regs.romcl) {
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regs.romcl -= min(clocks, regs.romcl);
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if(regs.romcl == 0) {
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regs.sfr.r = 0;
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regs.romdr = bus_read((regs.rombr << 16) + regs.r[14]);
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}
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}
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if(regs.ramcl) {
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regs.ramcl -= min(clocks, regs.ramcl);
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if(regs.ramcl == 0) {
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bus_write(0x700000 + (regs.rambr << 16) + regs.ramar, regs.ramdr);
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}
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}
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Coprocessor::step(clocks);
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synchronize_cpu();
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}
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auto SuperFX::rombuffer_sync() -> void {
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if(regs.romcl) step(regs.romcl);
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}
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auto SuperFX::rombuffer_update() -> void {
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regs.sfr.r = 1;
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regs.romcl = memory_access_speed();
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}
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auto SuperFX::rombuffer_read() -> uint8 {
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rombuffer_sync();
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return regs.romdr;
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}
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auto SuperFX::rambuffer_sync() -> void {
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if(regs.ramcl) step(regs.ramcl);
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}
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auto SuperFX::rambuffer_read(uint16 addr) -> uint8 {
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rambuffer_sync();
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return bus_read(0x700000 + (regs.rambr << 16) + addr);
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}
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auto SuperFX::rambuffer_write(uint16 addr, uint8 data) -> void {
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rambuffer_sync();
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regs.ramcl = memory_access_speed();
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regs.ramar = addr;
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regs.ramdr = data;
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}
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auto SuperFX::r14_modify(uint16 data) -> void {
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regs.r[14].data = data;
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rombuffer_update();
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}
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auto SuperFX::r15_modify(uint16 data) -> void {
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regs.r[15].data = data;
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r15_modified = true;
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}
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auto SuperFX::timing_reset() -> void {
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r15_modified = false;
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regs.romcl = 0;
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regs.romdr = 0;
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regs.ramcl = 0;
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regs.ramar = 0;
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regs.ramdr = 0;
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}
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#endif
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