piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-25 23:29:55 -06:00
Code Issues Packages Projects Releases Wiki Activity

refactor framebuffers to be more similar to hw

Browse Source 
allows for emulation of niche scanline glitches
This commit is contained in:
Jaklyy
2023-12-10 12:18:46 -05:00
parent c45d3320d0
commit 63a39b130e
4 changed files with 158 additions and 139 deletions
Download Patch File Download Diff File Expand all files Collapse all files

211
src/GPU3D_Soft.cpp
View File

@ -112,6 +112,43 @@ void SoftRenderer::SetThreaded(bool threaded) noexcept
}
}
template <bool odd>
bool SoftRenderer::DoTimings(s32 cycles)
{
if constexpr (odd)
{
RasterTimingCounterOdd += cycles;
if ((RasterTimingCounterOdd + RasterTimingCounterPrev) < RasterTimingCap) return false;
}
else
{
RasterTimingCounterEven += cycles;
if ((RasterTimingCounterEven + RasterTimingCounterPrev) < RasterTimingCap) return false;
}
GPU.GPU3D.DispCnt |= (1<<12);
return true;
}
template <bool odd>
void SoftRenderer::EndScanline()
{
if constexpr (!odd)
{
RasterTimingCounterPrev += std::max(RasterTimingCounterOdd, RasterTimingCounterEven);
RasterTimingCounterPrev -= PerScanlineRecup; // wip
if (RasterTimingCounterPrev < 0) RasterTimingCounterPrev = 0;
// calc is wrong, seems to round up...?
GPU.GPU3D.RDLines = (RasterTimingCap - RasterTimingCounterPrev) / PerScanlineTiming;
// seems to display the lowest scanline buffer count reached during the current frame.
// we also caps it to 46 here, because this reg does that too for some reason.
if (GPU.GPU3D.RDLines > GPU.GPU3D.RDLinesMin) GPU.GPU3D.RDLines = GPU.GPU3D.RDLinesMin;
else if (GPU.GPU3D.RDLines < GPU.GPU3D.RDLinesMin) GPU.GPU3D.RDLinesMin = GPU.GPU3D.RDLines;
RasterTimingCounterOdd = 0;
RasterTimingCounterEven = 0;
}
}
void SoftRenderer::TextureLookup(u32 texparam, u32 texpal, s16 s, s16 t, u16* color, u8* alpha)
{
u32 vramaddr = (texparam & 0xFFFF) << 3;
@ -925,7 +962,8 @@ void SoftRenderer::RenderShadowMaskScanline(RendererPolygon* rp, s32 y)
rp->XR = rp->SlopeR.Step();
}
bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
template <bool odd>
bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y)
{
Polygon* polygon = rp->PolyData;
u32 polyattr = (polygon->Attr & 0x3F008000);
@ -946,7 +984,7 @@ bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
CheckSlope(rp, y);
if (GPU.GPU3D.DoTimings(PerPolyTiming, odd)) return Step(rp, true);
if (DoTimings<odd>(PerPolyTiming)) return Step(rp, true);
Vertex *vlcur, *vlnext, *vrcur, *vrnext;
s32 xstart, xend;
@ -955,7 +993,7 @@ bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
s32 l_edgecov, r_edgecov;
Interpolator<1>* interp_start;
Interpolator<1>* interp_end;
u8 pixelsrendered = 0; // for tracking timings
u16 pixelsrendered = 0; // for tracking timings
xstart = rp->XL;
xend = rp->XR;
@ -1095,10 +1133,12 @@ bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
for (; x < xlimit; x++)
{
if (pixelsrendered >= 4 && GPU.GPU3D.DoTimings(PerPixelTiming, odd)) return Step(rp, true);
else pixelsrendered++;
if (pixelsrendered >= 4 && DoTimings<odd>(PerPixelTiming)) return Step(rp, true);
pixelsrendered++;
if (!l_filledge) continue;
u32 pixeladdr = FirstPixelOffset + (y*ScanlineWidth) + x;
u32 pixeladdr = (BufferOffset * ScanlineWidth) + x;
u32 dstattr = AttrBuffer[pixeladdr];
// check stencil buffer for shadows
@ -1192,10 +1232,12 @@ bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
for (; x < xlimit; x++)
{
if (pixelsrendered >= 4 && GPU.GPU3D.DoTimings(PerPixelTiming, odd)) return Step(rp, true);
else pixelsrendered++;
if (pixelsrendered >= 4 && DoTimings<odd>(PerPixelTiming)) return Step(rp, true);
pixelsrendered++;
if (wireframe && !edge) continue;
u32 pixeladdr = FirstPixelOffset + (y*ScanlineWidth) + x;
u32 pixeladdr = (BufferOffset * ScanlineWidth) + x;
u32 dstattr = AttrBuffer[pixeladdr];
// check stencil buffer for shadows
@ -1283,13 +1325,15 @@ bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
xcov = (r_edgecov >> 12) & 0x3FF;
if (xcov == 0x3FF) xcov = 0;
}
//if (rp->SlopeR.Increment != 0 && DoTimings(PerRightSlope, odd)) return Step(rp, true); // should be fine to not immediately return? might be wrong
for (; x < xlimit; x++)
{
if (pixelsrendered >= 4 && GPU.GPU3D.DoTimings(PerPixelTiming, odd)) return Step(rp, true);
else pixelsrendered++;
if (pixelsrendered >= 4 && DoTimings<odd>(PerPixelTiming)) return Step(rp, true);
pixelsrendered++;
if (!r_filledge) continue;
u32 pixeladdr = FirstPixelOffset + (y*ScanlineWidth) + x;
u32 pixeladdr = (BufferOffset * ScanlineWidth) + x;
u32 dstattr = AttrBuffer[pixeladdr];
// check stencil buffer for shadows
@ -1377,9 +1421,9 @@ bool SoftRenderer::RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd)
return Step(rp, false);
}
void SoftRenderer::RenderScanline(s32 y, int npolys)
template <bool odd>
bool SoftRenderer::RenderScanline(s32 y, int npolys)
{
bool odd = !(y % 2);
bool abort = false;
for (int i = 0; i < npolys; i++)
{
@ -1393,17 +1437,20 @@ void SoftRenderer::RenderScanline(s32 y, int npolys)
}
else if (y == polygon->YBottom && y != polygon->YTop)
{
if (GPU.GPU3D.DoTimings(EmptyPolyScanline, odd)) abort = true;
if (DoTimings<odd>(EmptyPolyScanline)) abort = true;
}
else if (y >= polygon->YTop && (y < polygon->YBottom || (y == polygon->YTop && polygon->YBottom == polygon->YTop)))
{
if (polygon->IsShadowMask)
RenderShadowMaskScanline(rp, y);
;//RenderShadowMaskScanline(rp, y);
else
if (RenderPolygonScanline(rp, y, odd)) abort = true;
if (RenderPolygonScanline<odd>(rp, y)) abort = true;
}
}
GPU.GPU3D.EndScanline(odd);
BufferOffset = (BufferOffset + 1) & 0x7; // loop if == 8
EndScanline<odd>();
return abort;
}
u32 SoftRenderer::CalculateFogDensity(u32 pixeladdr)
@ -1445,20 +1492,28 @@ u32 SoftRenderer::CalculateFogDensity(u32 pixeladdr)
return density;
}
void SoftRenderer::ScanlineFinalPass(s32 y)
template<bool odd, bool finish>
void SoftRenderer::ScanlineFinalPass(s32 y, u8 rdbufferoffset, bool late)
{
// to consider:
// clearing all polygon fog flags if the master flag isn't set?
// merging all final pass loops into one?
u8 tempoffset;
if constexpr (finish)
tempoffset = (BufferOffset - 2 + (!odd));
else
tempoffset = (BufferOffset - 4 + (!odd));
if (GPU.GPU3D.RenderDispCnt & (1<<5))
if (tempoffset > 7) tempoffset -= 0xF8; // handle underflows
/*if (GPU.GPU3D.RenderDispCnt & (1<<5))
{
// edge marking
// only applied to topmost pixels
for (int x = 0; x < 256; x++)
{
u32 pixeladdr = FirstPixelOffset + (y*ScanlineWidth) + x;
u32 pixeladdr = (tempoffset * ScanlineWidth) + x;
u32 attr = AttrBuffer[pixeladdr];
if (!(attr & 0xF)) continue;
@ -1482,7 +1537,7 @@ void SoftRenderer::ScanlineFinalPass(s32 y)
AttrBuffer[pixeladdr] = (AttrBuffer[pixeladdr] & 0xFFFFE0FF) | 0x00001000;
}
}
}
}*/
if (GPU.GPU3D.RenderDispCnt & (1<<7))
{
@ -1506,7 +1561,7 @@ void SoftRenderer::ScanlineFinalPass(s32 y)
for (int x = 0; x < 256; x++)
{
u32 pixeladdr = FirstPixelOffset + (y*ScanlineWidth) + x;
u32 pixeladdr = (tempoffset * ScanlineWidth) + x;
u32 density, srccolor, srcR, srcG, srcB, srcA;
u32 attr = AttrBuffer[pixeladdr];
@ -1571,7 +1626,7 @@ void SoftRenderer::ScanlineFinalPass(s32 y)
for (int x = 0; x < 256; x++)
{
u32 pixeladdr = FirstPixelOffset + (y*ScanlineWidth) + x;
u32 pixeladdr = (tempoffset * ScanlineWidth) + x;
u32 attr = AttrBuffer[pixeladdr];
if (!(attr & 0xF)) continue;
@ -1613,47 +1668,32 @@ void SoftRenderer::ScanlineFinalPass(s32 y)
ColorBuffer[pixeladdr] = topR | (topG << 8) | (topB << 16) | (topA << 24);
}
}
if (late)
{
memcpy(&FinalBuffer[y*ScanlineWidth], &RDBuffer[rdbufferoffset*ScanlineWidth], 4 * ScanlineWidth);
memcpy(&RDBuffer[rdbufferoffset*ScanlineWidth], &ColorBuffer[tempoffset*ScanlineWidth], 4 * ScanlineWidth);
}
else
{
memcpy(&RDBuffer[rdbufferoffset*ScanlineWidth], &ColorBuffer[tempoffset*ScanlineWidth], 4 * ScanlineWidth);
memcpy(&FinalBuffer[y*ScanlineWidth], &RDBuffer[rdbufferoffset*ScanlineWidth], 4 * ScanlineWidth);
}
}
void SoftRenderer::ClearBuffers()
void SoftRenderer::ClearBuffers(s32 y)
{
u32 clearz = ((GPU.GPU3D.RenderClearAttr2 & 0x7FFF) * 0x200) + 0x1FF;
u32 polyid = GPU.GPU3D.RenderClearAttr1 & 0x3F000000; // this sets the opaque polygonID
// fill screen borders for edge marking
for (int x = 0; x < ScanlineWidth; x++)
{
ColorBuffer[x] = 0;
DepthBuffer[x] = clearz;
AttrBuffer[x] = polyid;
}
for (int x = ScanlineWidth; x < ScanlineWidth*193; x+=ScanlineWidth)
{
ColorBuffer[x] = 0;
DepthBuffer[x] = clearz;
AttrBuffer[x] = polyid;
ColorBuffer[x+257] = 0;
DepthBuffer[x+257] = clearz;
AttrBuffer[x+257] = polyid;
}
for (int x = ScanlineWidth*193; x < ScanlineWidth*194; x++)
{
ColorBuffer[x] = 0;
DepthBuffer[x] = clearz;
AttrBuffer[x] = polyid;
}
// clear the screen
if (GPU.GPU3D.RenderDispCnt & (1<<14))
{
u8 xoff = (GPU.GPU3D.RenderClearAttr2 >> 16) & 0xFF;
u8 yoff = (GPU.GPU3D.RenderClearAttr2 >> 24) & 0xFF;
u8 yoff = ((GPU.GPU3D.RenderClearAttr2 >> 24) & 0xFF) + y;
for (int y = 0; y < ScanlineWidth*192; y+=ScanlineWidth)
for (int i = 0; i < 2; i++)
{
for (int x = 0; x < 256; x++)
{
@ -1669,7 +1709,7 @@ void SoftRenderer::ClearBuffers()
u32 z = ((val3 & 0x7FFF) * 0x200) + 0x1FF;
u32 pixeladdr = FirstPixelOffset + y + x;
u32 pixeladdr = ((BufferOffset+i) * ScanlineWidth) + x;
ColorBuffer[pixeladdr] = color;
DepthBuffer[pixeladdr] = z;
AttrBuffer[pixeladdr] = polyid | (val3 & 0x8000);
@ -1690,12 +1730,12 @@ void SoftRenderer::ClearBuffers()
u32 color = r | (g << 8) | (b << 16) | (a << 24);
polyid |= (GPU.GPU3D.RenderClearAttr1 & 0x8000);
for (int y = 0; y < ScanlineWidth*192; y+=ScanlineWidth)
for (int i = 0; i < 2; i++)
{
for (int x = 0; x < 256; x++)
{
u32 pixeladdr = FirstPixelOffset + y + x;
u32 pixeladdr = ((BufferOffset+i) * ScanlineWidth) + x;
ColorBuffer[pixeladdr] = color;
DepthBuffer[pixeladdr] = clearz;
AttrBuffer[pixeladdr] = polyid;
@ -1712,19 +1752,38 @@ void SoftRenderer::RenderPolygons(bool threaded, Polygon** polygons, int npolys)
if (polygons[i]->Degenerate) continue;
SetupPolygon(&PolygonList[j++], polygons[i]);
}
s32 y = 0;
s8 prevbufferline = -2;
bool latebuffer[192] = {};
RenderScanline(0, j);
for (u8 quarter = 0; quarter < 4; quarter++)
for (u8 bufferline = 0; bufferline < 48; bufferline += 2)
{
ClearBuffers(y);
latebuffer[y] = RenderScanline<true>(y, j);
latebuffer[y+1] = RenderScanline<false>(y+1, j);
for (s32 y = 1; y < 192; y++)
{
RenderScanline(y, j);
ScanlineFinalPass(y-1);
if (prevbufferline >= 0)
{
if (!latebuffer[y-2]) latebuffer[y] = false;
if (!latebuffer[y-1]) latebuffer[y+1] = false;
if (threaded)
Platform::Semaphore_Post(Sema_ScanlineCount);
}
ScanlineFinalPass<true, false>(y-2, prevbufferline, latebuffer[y-2]);
ScanlineFinalPass<false, false>(y-1, prevbufferline+1, latebuffer[y-1]);
}
ScanlineFinalPass(191);
y += 2;
prevbufferline = bufferline;
if (threaded)
Platform::Semaphore_Post(Sema_ScanlineCount);
}
ScanlineFinalPass<true, true>(190, prevbufferline, latebuffer[190]);
ScanlineFinalPass<false, true>(191, prevbufferline+1, latebuffer[191]);
if (threaded)
Platform::Semaphore_Post(Sema_ScanlineCount);
@ -1734,6 +1793,10 @@ void SoftRenderer::VCount144()
{
if (RenderThreadRunning.load(std::memory_order_relaxed) && !GPU.GPU3D.AbortFrame)
Platform::Semaphore_Wait(Sema_RenderDone);
RasterTimingCounterPrev = 0;
RasterTimingCounterOdd = 0;
RasterTimingCounterEven = 0;
}
void SoftRenderer::RenderFrame()
@ -1750,11 +1813,7 @@ void SoftRenderer::RenderFrame()
{
Platform::Semaphore_Post(Sema_RenderStart);
}
else if (!FrameIdentical)
{
ClearBuffers();
RenderPolygons(false, &GPU.GPU3D.RenderPolygonRAM[0], GPU.GPU3D.RenderNumPolygons);
}
else if (!FrameIdentical) RenderPolygons(false, &GPU.GPU3D.RenderPolygonRAM[0], GPU.GPU3D.RenderNumPolygons);
}
void SoftRenderer::RestartFrame()
@ -1774,11 +1833,7 @@ void SoftRenderer::RenderThreadFunc()
{
Platform::Semaphore_Post(Sema_ScanlineCount, 192);
}
else
{
ClearBuffers();
RenderPolygons(true, &GPU.GPU3D.RenderPolygonRAM[0], GPU.GPU3D.RenderNumPolygons);
}
else RenderPolygons(true, &GPU.GPU3D.RenderPolygonRAM[0], GPU.GPU3D.RenderNumPolygons);
Platform::Semaphore_Post(Sema_RenderDone);
RenderThreadRendering = false;
@ -1793,7 +1848,7 @@ u32* SoftRenderer::GetLine(int line)
Platform::Semaphore_Wait(Sema_ScanlineCount);
}
return &ColorBuffer[(line * ScanlineWidth) + FirstPixelOffset];
return &FinalBuffer[(line * ScanlineWidth) + FirstPixelOffset];
}
}