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improve scanline timeout slightly i hope

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finally touch this again after 2 months
This commit is contained in:
Jaklyy 2024-02-13 21:38:53 -05:00
parent ba4b4e2263
commit ae934021e5
1 changed files with 12 additions and 14 deletions
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26
src/GPU3D_Soft.cpp
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@ -1859,11 +1859,10 @@ 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];
{
s32 rastertimingeven = 0;
s32 rastertimingodd = 0;
// scanlines are rendered in pairs of two
@ -1883,10 +1882,9 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
// 12 cycles at the end of the scanline are always used, unless the scanline got within 12 cycles of timing out. Don't ask why, it just does.
s32 timeoutdist = ScanlineTimeout - RasterTiming;
RasterTiming += std::clamp(timeoutdist, 0, 12);
}
//set next scanline timeout
if (ScanlineTimeout == FrameLength) ScanlineTimeout = rasterevents[ScanlineRead] - FinalPassLen;
if (ScanlineTimeout == FrameLength) ScanlineTimeout = rasterevents[ScanlineRead] - (ScanlineReadSpeed+RastDelay);
else ScanlineTimeout += TimeoutIncrement;
// schedule next scanline pair + the final pass of the latest pair
@ -1894,11 +1892,11 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
if (scanlinesinit < 192) rasterevents[RenderStart] = RasterTiming+RastDelay; // scheduled 4 cycles late (presumably due to initial polygon timing shenanigans?)
else rasterevents[RenderStart] = FrameLength;
break;
}
// final rendering pass (edge marking, anti-aliasing, fog) (fixed length of 496 (maybe 500?) cycles)
case RenderFinal:
{
// schedule a scanline push event
rasterevents[PushScanline] = rasterevents[RenderFinal] + ScanlinePushDelay;
@ -1923,11 +1921,11 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
else // schedule next final pass event to immediately after the current one
rasterevents[RenderFinal] += FinalPassLen;
break;
}
// push scanlines to the intermediary "frame buffer" for the 2d engine to read them. (fixed length of ??? cycles)
case PushScanline:
{
// reschedule events if buffer is full
if (scanlineswaitingforread >= 48)
{
@ -1942,11 +1940,10 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
break;
}
{
// if a scanline push might intersect a read determine the point at which it intersects
s32 pixelstopush = (scanlinespushed > scanlinesread ? 256 : (rasterevents[ScanlineRead] + (ScanlineReadInc*scanlineswaitingforread)) - rasterevents[PushScanline]);
leftovers = BeginPushScanline(scanlinespushed, pixelstopush);
}
scanlineswaitingforpush--;
scanlinespushed++;
@ -1962,11 +1959,11 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
rasterevents[PushScanline] = FrameLength; // unsched event if no scanlines are waiting to be finished
break;
}
// 2d engine reading scanlines from the intermediary "framebuffer"
case ScanlineRead:
{
// read scanline from buffer
ReadScanline(scanlinesread);
@ -1981,11 +1978,11 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
if (scanlinesread < 192) rasterevents[ScanlineRead] += ScanlineReadInc;
else rasterevents[ScanlineRead] = FrameLength;
break;
}
// finish pushing a scanline to the buffer if it got interrupted by the read process.
case PushScanlineP2:
{
FinishPushScanline(scanlinespushed2, leftovers);
scanlineswaitingforread++;
scanlinespushed2++;
@ -1994,6 +1991,7 @@ void SoftRenderer::RenderPolygons(GPU& gpu, Polygon** polygons, int npolys)
if (scanlinespushed2 >= scanlinespushed) rasterevents[PushScanlineP2] = FrameLength;
break;
}
}
}
}