mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-02-23 06:32:32 +01:00
47d4bd4d81
byuu says: Changelog: - restructured the project and removed a whole bunch of old/dead directives from higan/GNUmakefile - huge amounts of work on hiro/cocoa (compiles but ~70% of the functionality is commented out) - fixed a masking error in my ARM CPU disassembler [Lioncash] - SFC: decided to change board cic=(411,413) back to board region=(ntsc,pal) ... the former was too obtuse If you rename Boolean (it's a problem with an include from ruby, not from hiro) and disable all the ruby drivers, you can compile an OS X binary, but obviously it's not going to do anything. It's a boring WIP, I just wanted to push out the project structure change now at the start of this WIP cycle.
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
//PPUcounter emulates the H/V latch counters of the S-PPU2.
|
|
//
|
|
//real hardware has the S-CPU maintain its own copy of these counters that are
|
|
//updated based on the state of the S-PPU Vblank and Hblank pins. emulating this
|
|
//would require full lock-step synchronization for every clock tick.
|
|
//to bypass this and allow the two to run out-of-order, both the CPU and PPU
|
|
//classes inherit PPUcounter and keep their own counters.
|
|
//the timers are kept in sync, as the only differences occur on V=240 and V=261,
|
|
//based on interlace. thus, we need only synchronize and fetch interlace at any
|
|
//point before this in the frame, which is handled internally by this class at
|
|
//V=128.
|
|
|
|
class PPUcounter {
|
|
public:
|
|
alwaysinline void tick();
|
|
alwaysinline void tick(unsigned clocks);
|
|
|
|
alwaysinline bool field () const;
|
|
alwaysinline uint16 vcounter() const;
|
|
alwaysinline uint16 hcounter() const;
|
|
inline uint16 hdot() const;
|
|
inline uint16 lineclocks() const;
|
|
|
|
alwaysinline bool field (unsigned offset) const;
|
|
alwaysinline uint16 vcounter(unsigned offset) const;
|
|
alwaysinline uint16 hcounter(unsigned offset) const;
|
|
|
|
inline void reset();
|
|
function<void ()> scanline;
|
|
void serialize(serializer&);
|
|
|
|
private:
|
|
inline void vcounter_tick();
|
|
|
|
struct {
|
|
bool interlace;
|
|
bool field;
|
|
uint16 vcounter;
|
|
uint16 hcounter;
|
|
} status;
|
|
|
|
struct {
|
|
bool field[2048];
|
|
uint16 vcounter[2048];
|
|
uint16 hcounter[2048];
|
|
|
|
int32 index;
|
|
} history;
|
|
};
|