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improvement on r3284: instead fix new ppu debug reset problem by suspending CPU until the new PPU is in synch for a new frame

This commit is contained in:
rainwarrior 2016-08-31 03:33:04 +00:00
parent fc71914b23
commit c4bc741ee1
1 changed files with 15 additions and 10 deletions
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23
trunk/src/ppu.cpp
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@ -70,6 +70,8 @@ static uint32 ppulut1[256];
static uint32 ppulut2[256];
static uint32 ppulut3[128];
static bool new_ppu_reset = false;
int test = 0;
template<typename T, int BITS>
@ -1696,8 +1698,7 @@ void FCEUPPU_Reset(void) {
kook = 0;
idleSynch = 1;
ppur.reset();
spr_read.reset();
new_ppu_reset = true; // delay reset of ppur/spr_read until it's ready to start a new frame
}
void FCEUPPU_Power(void) {
@ -1957,8 +1958,11 @@ const int kFetchTime = 2;
void runppu(int x) {
ppur.status.cycle = (ppur.status.cycle + x) % ppur.status.end_cycle;
if (!new_ppu_reset) // if resetting, suspend CPU until the first frame
{
X6502_Run(x);
}
}
//todo - consider making this a 3 or 4 slot fifo to keep from touching so much memory
struct BGData {
@ -2028,15 +2032,16 @@ static inline int PaletteAdjustPixel(int pixel) {
int framectr = 0;
int FCEUX_PPU_Loop(int skip) {
if (new_ppu_reset) // first frame since reset, time to initialize
{
ppur.reset();
spr_read.reset();
new_ppu_reset = false;
}
//262 scanlines
if (ppudead) {
// problem: reset triggered by debugger may be mid-frame,
// causing erroneous extra PPU execution after the reset to permanently misalign ppur.status.cycle and ppur.par
// manually realigning them here, but a more "ideal" solution might be to check ppudead after every runppu,
// and goto finish so there's no time to misalign?
ppur.status.cycle = 0;
ppur.par = 0;
// not quite emulating all the NES power up behavior
// since it is known that the NES ignores writes to some
// register before around a full frame, but no games