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refactor framebuffers to be more similar to hw

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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
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37
src/GPU3D_Soft.h
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@ -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);
@ -463,14 +465,19 @@ 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
@ -478,17 +485,21 @@ private:
// 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)