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fix bottom scanline bugging out

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use a method of tracking progress through rendering that's less prone to me messing it up
This commit is contained in:
Jaklyy 2023-12-25 13:10:32 -05:00
parent f239d0cf0d
commit ee3e38aed3
1 changed files with 38 additions and 28 deletions
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66
src/GPU3D_Soft.cpp
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@ -1798,7 +1798,6 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
// init all this junk i need to keep track of
s32 rasterevents[RasterEvents_MAX];
s32 y = 0;
rasterevents[RenderStart] = 0;
rasterevents[RenderFinal] = INT_MAX/2;
rasterevents[PushScanline] = INT_MAX/2;
@ -1809,10 +1808,12 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
s32 rastertimingeven = 0;
s32 rastertimingodd = 0;
u8 scanlinesread = 0;
u8 scanlinesinit = 0;
u8 scanlinesfin = 0;
u8 scanlinespushed = 0;
u8 scanlinespushed2 = 0;
s16 scanlinesrendered = 0;
s16 scanlineswaiting = 0;
s16 scanlineswaitingforpush = 0;
s16 scanlineswaitingforread = 0;
u8 nextevent;
u16 leftovers;
@ -1835,6 +1836,7 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
// initial rendering pass (polygons, texturing, etc.) (variable cycle length)
case RenderStart:
// set current raster time to the start of the event
RasterTiming = rasterevents[RenderStart];
@ -1842,9 +1844,10 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
s32 rastertimingeven = 0;
s32 rastertimingodd = 0;
// scanlines are rendered in pairs of two
RenderScanline(gpu, y, j, &rastertimingeven);
RenderScanline(gpu, y+1, j, &rastertimingodd);
RenderScanline(gpu, scanlinesinit, j, &rastertimingeven);
RenderScanline(gpu, scanlinesinit+1, j, &rastertimingodd);
scanlinesinit += 2;
// a new scanline pair cannot begin until both scanlines are finished.
s32 timespent = std::max(rastertimingeven, rastertimingodd);
@ -1858,11 +1861,14 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
s32 timeoutdist = ScanlineTimeout - RasterTiming;
RasterTiming += std::clamp(timeoutdist, 0, 12);
}
//set next scanline timeout
if (ScanlineTimeout == INT_MAX/2) ScanlineTimeout = rasterevents[ScanlineRead] - FinalPassLen;
else ScanlineTimeout += TimeoutIncrement;
// schedule next scanline pair + the final pass of the latest pair
rasterevents[RenderFinal] = RasterTiming;
if (y < 190) rasterevents[RenderStart] = RasterTiming+RastDelay; // scheduled 4 cycles late (presumably due to initial polygon timing shenanigans?)
if (scanlinesinit < 192) rasterevents[RenderStart] = RasterTiming+RastDelay; // scheduled 4 cycles late (presumably due to initial polygon timing shenanigans?)
else rasterevents[RenderStart] = INT_MAX/2;
break;
@ -1874,25 +1880,25 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
rasterevents[PushScanline] = rasterevents[RenderFinal] + ScanlinePushDelay;
// if the first scanline pair was just finished only render one scanline
if (y >= 2)
if (scanlinesfin > 0)
{
ScanlineFinalPass(gpu.GPU3D, y-1);
scanlinesrendered++;
ScanlineFinalPass(gpu.GPU3D, scanlinesfin);
scanlineswaitingforpush++;
scanlinesfin++;
}
// if the last scanline pair was just finished only render one scanline
if (y <= 192)
if (scanlinesfin < 191)
{
ScanlineFinalPass(gpu.GPU3D, y);
scanlinesrendered++;
// unschedule final pass event
rasterevents[RenderFinal] = INT_MAX/2;
ScanlineFinalPass(gpu.GPU3D, scanlinesfin);
scanlineswaitingforpush++;
scanlinesfin++;
}
// unschedule final pass event
if (scanlinesfin != 191)
rasterevents[RenderFinal] = INT_MAX/2;
else // schedule next final pass event to immediately after the current one
rasterevents[RenderFinal] += FinalPassLen;
// increment y for main rendering passes
y += 2;
break;
@ -1900,28 +1906,32 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
case PushScanline:
// reschedule events if buffer is full
if (scanlineswaiting >= 48)
if (scanlineswaitingforread >= 48)
{
rasterevents[PushScanline] = rasterevents[ScanlineRead];
// dont reschedule these events if they're done.
rasterevents[RenderStart] = ((y > 190) ? INT_MAX/2 : rasterevents[ScanlineRead] + RastDelay);
rasterevents[RenderFinal] = ((y > 194) ? INT_MAX/2 : rasterevents[ScanlineRead]);
if (scanlinesinit < 192)
rasterevents[RenderStart] = rasterevents[ScanlineRead] + RastDelay;
if (scanlinesfin < 192)
rasterevents[RenderFinal] = rasterevents[ScanlineRead];
break;
}
leftovers = BeginPushScanline(scanlinespushed, (rasterevents[ScanlineRead] + (ScanlineReadInc*scanlineswaiting)) - rasterevents[PushScanline]);
scanlinesrendered--;
leftovers = BeginPushScanline(scanlinespushed, (rasterevents[ScanlineRead] + (ScanlineReadInc*scanlineswaitingforread)) - rasterevents[PushScanline]);
scanlineswaitingforpush--;
scanlinespushed++;
// schedule the finish push event if needed
if (leftovers != 0) rasterevents[PushScanlineP2] = rasterevents[ScanlineRead];
else
{
scanlineswaiting++;
scanlineswaitingforread++;
scanlinespushed2++;
}
if (scanlinesrendered <= 0)
if (scanlineswaitingforpush <= 0)
rasterevents[PushScanline] = INT_MAX/2; // unsched event if no scanlines are waiting to be finished
break;
@ -1938,7 +1948,7 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
Platform::Semaphore_Post(Sema_ScanlineCount);
scanlinesread++;
scanlineswaiting--;
scanlineswaitingforread--;
// reschedule event for one scanline later unless all scanlines have been read
if (scanlinesread < 192) rasterevents[ScanlineRead] += ScanlineReadInc;
@ -1950,7 +1960,7 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
case PushScanlineP2:
FinishPushScanline(scanlinespushed2, leftovers);
scanlineswaiting++;
scanlineswaitingforread++;
scanlinespushed2++;
// unschedule event if all partially pushed scanlines have been pushed