refactor framebuffers to be more similar to hw

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

View File

@ -224,9 +224,6 @@ void GPU3D::Reset() noexcept
RDLines = 46;
RDLinesMin = 46;
RasterTimingCounterPrev = 0;
RasterTimingCounterOdd = 0;
RasterTimingCounterEven = 0;
memset(ToonTable, 0, sizeof(ToonTable));
memset(EdgeTable, 0, sizeof(EdgeTable));
@ -776,41 +773,6 @@ void GPU3D::StallPolygonPipeline(s32 delay, s32 nonstalldelay) noexcept
}
}
bool GPU3D::DoTimings(s32 cycles, bool odd)
{
if (odd)
{
RasterTimingCounterOdd += cycles;
if ((RasterTimingCounterOdd + RasterTimingCounterPrev) < RasterTimingCap) return false;
}
else
{
RasterTimingCounterEven += cycles;
if ((RasterTimingCounterEven + RasterTimingCounterPrev) < RasterTimingCap) return false;
}
DispCnt |= (1<<12);
return true;
}
void GPU3D::EndScanline(bool odd)
{
if (!odd)
{
RasterTimingCounterPrev += std::max(RasterTimingCounterOdd, RasterTimingCounterEven);
RasterTimingCounterPrev -= PerScanlineRecup; // wip
if (RasterTimingCounterPrev < 0) RasterTimingCounterPrev = 0;
// calc is wrong, seems to round up...?
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 (RDLines > RDLinesMin) RDLines = RDLinesMin;
else if (RDLines < RDLinesMin) RDLinesMin = RDLines;
RasterTimingCounterOdd = 0;
RasterTimingCounterEven = 0;
}
}
template<int comp, s32 plane, bool attribs>
void ClipSegment(Vertex* outbuf, Vertex* vin, Vertex* vout)
{
@ -2409,9 +2371,6 @@ void GPU3D::CheckFIFODMA() noexcept
void GPU3D::VCount144() noexcept
{
RDLinesMin = 46;
RasterTimingCounterPrev = 0;
RasterTimingCounterOdd = 0;
RasterTimingCounterEven = 0;
CurrentRenderer->VCount144();
}

View File

@ -116,9 +116,6 @@ public:
void WriteToGXFIFO(u32 val) noexcept;
bool DoTimings(s32 cycles, bool odd);
void EndScanline(bool odd);
[[nodiscard]] bool IsRendererAccelerated() const noexcept;
[[nodiscard]] Renderer3D& GetCurrentRenderer() noexcept { return *CurrentRenderer; }
[[nodiscard]] const Renderer3D& GetCurrentRenderer() const noexcept { return *CurrentRenderer; }
@ -250,9 +247,6 @@ public:
u32 DispCnt = 0;
u32 RDLines = 0;
u32 RDLinesMin = 0;
s32 RasterTimingCounterPrev = 0;
s32 RasterTimingCounterOdd = 0;
s32 RasterTimingCounterEven = 0;
u8 AlphaRefVal = 0;
u8 AlphaRef = 0;
@ -342,7 +336,7 @@ public:
static constexpr int RasterTimingCap = 51116*Frac;
static constexpr int PerScanlineTiming = 1064*Frac; // approximate currently, used to calc RDLines. TEMPORARY UNTIL ACCURATE "FRAMEBUFFER" CAN BE IMPLEMENTED
static constexpr int PerScanlineRecup = 2112*Frac; // seems to check out?
static constexpr int PerRightSlope = 1*Frac;
static constexpr int PerPolyTiming = 12*Frac; // should be correct for *most* line polygons and polygons with vertical slopes
static constexpr int PerPixelTiming = 1*Frac; // does not apply to the first 4 pixels in a polygon (per scanline?)
static constexpr int EmptyPolyScanline = 4*Frac - 14; // seems to be slightly under 4?

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);
@ -1691,11 +1731,11 @@ void SoftRenderer::ClearBuffers()
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;
@ -1713,18 +1753,37 @@ void SoftRenderer::RenderPolygons(bool threaded, Polygon** polygons, int npolys)
SetupPolygon(&PolygonList[j++], polygons[i]);
}
RenderScanline(0, j);
s32 y = 0;
s8 prevbufferline = -2;
bool latebuffer[192] = {};
for (s32 y = 1; y < 192; y++)
for (u8 quarter = 0; quarter < 4; quarter++)
for (u8 bufferline = 0; bufferline < 48; bufferline += 2)
{
RenderScanline(y, j);
ScanlineFinalPass(y-1);
ClearBuffers(y);
latebuffer[y] = RenderScanline<true>(y, j);
latebuffer[y+1] = RenderScanline<false>(y+1, j);
if (prevbufferline >= 0)
{
if (!latebuffer[y-2]) latebuffer[y] = false;
if (!latebuffer[y-1]) latebuffer[y+1] = false;
ScanlineFinalPass<true, false>(y-2, prevbufferline, latebuffer[y-2]);
ScanlineFinalPass<false, false>(y-1, prevbufferline+1, latebuffer[y-1]);
}
y += 2;
prevbufferline = bufferline;
if (threaded)
Platform::Semaphore_Post(Sema_ScanlineCount);
}
ScanlineFinalPass(191);
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];
}
}

View File

@ -454,6 +454,8 @@ private:
melonDS::GPU& GPU;
RendererPolygon PolygonList[2048];
template <bool odd> bool DoTimings(s32 cycles);
template <bool odd> void EndScanline();
void TextureLookup(u32 texparam, u32 texpal, s16 s, s16 t, u16* color, u8* alpha);
u32 RenderPixel(Polygon* polygon, u8 vr, u8 vg, u8 vb, s16 s, s16 t);
void PlotTranslucentPixel(u32 pixeladdr, u32 color, u32 z, u32 polyattr, u32 shadow);
@ -463,32 +465,41 @@ private:
bool Step(RendererPolygon* rp, bool abortscanline);
void CheckSlope(RendererPolygon* rp, s32 y);
void RenderShadowMaskScanline(RendererPolygon* rp, s32 y);
bool RenderPolygonScanline(RendererPolygon* rp, s32 y, bool odd);
void RenderScanline(s32 y, int npolys);
template <bool odd> bool RenderPolygonScanline(RendererPolygon* rp, s32 y);
template <bool odd> bool RenderScanline(s32 y, int npolys);
u32 CalculateFogDensity(u32 pixeladdr);
void ScanlineFinalPass(s32 y);
void ClearBuffers();
template<bool odd, bool finish> void ScanlineFinalPass(s32 y, u8 rdbufferoffset, bool late);
void ClearBuffers(s32 y);
void RenderPolygons(bool threaded, Polygon** polygons, int npolys);
void RenderThreadFunc();
// counters for scanline rasterization timings
s32 RasterTimingCounterPrev = 0;
s32 RasterTimingCounterOdd = 0;
s32 RasterTimingCounterEven = 0;
// buffer dimensions are 258x194 to add a offscreen 1px border
// which simplifies edge marking tests
// buffer is duplicated to keep track of the two topmost pixels
// TODO: check if the hardware can accidentally plot pixels
// offscreen in that border
static constexpr int ScanlineWidth = 258;
static constexpr int NumScanlines = 194;
static constexpr int NumScanlinesRDLines = 194;
static constexpr int RDLinesBufferSize = ScanlineWidth * NumScanlinesRDLines;
static constexpr int ScanlineWidth = 256;
static constexpr int NumScanlines = 192;
static constexpr int NumScanlinesRD = 48;
static constexpr int NumScanlinesInternal = 8;
static constexpr int InternalBufferSize = ScanlineWidth * NumScanlinesInternal;
static constexpr int RDBufferSize = ScanlineWidth * NumScanlinesRD;
static constexpr int BufferSize = ScanlineWidth * NumScanlines;
static constexpr int FirstPixelOffset = ScanlineWidth + 1;
static constexpr int FirstPixelOffset = 0;
u32 ColorBuffer[RDLinesBufferSize * 2];
u32 DepthBuffer[RDLinesBufferSize * 2];
u32 AttrBuffer[RDLinesBufferSize * 2];
u32 FinalBuffer[BufferSize * 2];
u32 ColorBuffer[InternalBufferSize * 2];
u32 DepthBuffer[InternalBufferSize * 2];
u32 AttrBuffer[InternalBufferSize * 2];
u8 BufferOffset;
u32 RDBuffer[RDBufferSize];
u32 FinalBuffer[BufferSize];
// attribute buffer:
// bit0-3: edge flags (left/right/top/bottom)