mirror of
https://github.com/Michael-Prince-Sharpe/bsnes-classic.git
synced 2025-04-02 10:21:42 -04:00
79 lines
2 KiB
C++
79 lines
2 KiB
C++
#ifdef SUPERFX_CPP
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uint8 SuperFX::load_cache(unsigned dp, unsigned target) {
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unsigned sp = (regs.pbr << 16) + (uint16)(regs.cbr + dp);
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//$[00-5f]:[0000-ffff] ROM
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//$[60-7f]:[0000-ffff] RAM
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(regs.pbr <= 0x5f) ? rombuffer_sync() : rambuffer_sync();
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do {
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add_clocks(memory_access_speed());
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cache.buffer[dp++] = superfxbus.read(sp++);
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} while(dp <= target);
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if(cache.partial != cache.Flushed) {
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cache.partial = dp;
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if((target & 15) == 15) cache.valid[target >> 4] = true;
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}
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return cache.buffer[target];
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}
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uint8 SuperFX::op_read(uint16 addr) {
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unsigned offset = addr - regs.cbr;
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if(offset < 512) {
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if(cache.valid[offset >> 4] == false) {
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cache.partial = (offset & ~0xf) | (cache.partial & 0xf);
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return load_cache(cache.partial, offset);
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} else {
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add_clocks(cache_access_speed());
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return cache.buffer[offset];
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}
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}
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(regs.pbr <= 0x5f) ? rombuffer_sync() : rambuffer_sync();
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add_clocks(memory_access_speed());
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return superfxbus.read((regs.pbr << 16) + addr);
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}
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uint8 SuperFX::peekpipe() {
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uint8 result = regs.pipeline;
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regs.pipeline = op_read(regs.r[15]);
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return result;
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}
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uint8 SuperFX::pipe() {
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uint8 result = regs.pipeline;
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regs.pipeline = op_read(++regs.r[15]);
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return result;
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}
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void SuperFX::cache_finish() {
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if(cache.partial & 15) {
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load_cache(cache.partial, cache.partial | 15);
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}
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}
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void SuperFX::cache_flush() {
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cache.partial = cache.Flushed;
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for(unsigned n = 0; n < 32; n++) cache.valid[n] = false;
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}
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uint8 SuperFX::cache_mmio_read(uint16 addr) {
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addr = (addr + regs.cbr) & 511;
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return cache.buffer[addr];
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}
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void SuperFX::cache_mmio_write(uint16 addr, uint8 data) {
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addr = (addr + regs.cbr) & 511;
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cache.buffer[addr] = data;
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if((addr & 15) == 15) cache.valid[addr >> 4] = true;
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}
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void SuperFX::memory_reset() {
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cache_flush();
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for(unsigned n = 0; n < 512; n++) cache.buffer[n] = 0x00;
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for(unsigned n = 0; n < 2; n++) {
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pixelcache[n].offset = ~0;
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pixelcache[n].bitpend = 0x00;
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}
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}
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#endif
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