diff options
| -rw-r--r-- | src/GPU3D.cpp | 8 | ||||
| -rw-r--r-- | src/GPU3D.h | 4 | ||||
| -rw-r--r-- | src/GPU3D_Soft.cpp | 60 |
3 files changed, 63 insertions, 9 deletions
diff --git a/src/GPU3D.cpp b/src/GPU3D.cpp index e564684..b8eb2a2 100644 --- a/src/GPU3D.cpp +++ b/src/GPU3D.cpp @@ -720,6 +720,14 @@ void SubmitPolygon() u32 polyalpha = (CurPolygonAttr >> 16) & 0x1F; poly->Translucent = ((texfmt == 1 || texfmt == 6) && !(CurPolygonAttr & 0x10)) || (polyalpha > 0 && polyalpha < 31); + poly->IsShadowMask = ((CurPolygonAttr & 0x3F000030) == 0x00000030); + if ((NumPolygons == 1) || (!CurPolygonRAM[NumPolygons-2].IsShadowMask)) + poly->ClearStencil = poly->IsShadowMask; + else + poly->ClearStencil = false; + + poly->IsShadow = ((CurPolygonAttr & 0x30) == 0x30) && !poly->IsShadowMask; + if (LastStripPolygon && clipstart > 0) { if (nverts == lastpolyverts) diff --git a/src/GPU3D.h b/src/GPU3D.h index e0b6f74..a78639e 100644 --- a/src/GPU3D.h +++ b/src/GPU3D.h @@ -54,6 +54,10 @@ typedef struct bool FacingView; bool Translucent; + bool IsShadowMask; + bool IsShadow; + bool ClearStencil; + u32 VTop, VBottom; // vertex indices s32 YTop, YBottom; // Y coords s32 XTop, XBottom; // associated X coords diff --git a/src/GPU3D_Soft.cpp b/src/GPU3D_Soft.cpp index 888b823..2ca3100 100644 --- a/src/GPU3D_Soft.cpp +++ b/src/GPU3D_Soft.cpp @@ -36,6 +36,12 @@ u32 AttrBuffer[256*192]; // bit24-29: polygon ID // bit30: translucent flag +u8 StencilBuffer[256*192]; + +// note: the stencil buffer isn't emulated properly. +// emulating it properly would require rendering polygons per-scanline +// the stencil buffer is normally limited to 2 scanlines + bool Init() { @@ -662,9 +668,6 @@ void RenderPolygon(Polygon* polygon) if (rnext >= nverts) rnext = 0; } - - /*s32 dxl, dxr; - s32 lslope, rslope;*/ Slope slopeL, slopeR; s32 xL, xR; bool l_xmajor, r_xmajor; @@ -736,6 +739,13 @@ void RenderPolygon(Polygon* polygon) } if (ybot > 192) ybot = 192; + + if (polygon->ClearStencil) + { + s32 height = ybot - ytop; + memset(&StencilBuffer[ytop*256], 0, height*256); + } + for (s32 y = ytop; y < ybot; y++) { if (!isline) @@ -903,11 +913,43 @@ void RenderPolygon(Polygon* polygon) if (wireframe && edge==0) continue; - interpX.SetX(x); - u32 pixeladdr = (y*256) + x; + u32 attr = polygon->Attr & 0x3F008000; + + // check stencil buffer for shadows + if (polygon->IsShadow) + { + if (StencilBuffer[pixeladdr] == 0) + continue; + } + + interpX.SetX(x); s32 z = interpX.InterpolateZ(zl, zr); + + if (polygon->IsShadowMask) + { + // for shadow masks: set stencil bits where the depth test fails. + // draw nothing. + + // checkme + if (polyalpha == 31) + { + if (!wireframe) + { + if ((edge & 0x1) && !l_filledge) + continue; + if ((edge & 0x2) && !r_filledge) + continue; + } + } + + if (!fnDepthTest(DepthBuffer[pixeladdr], z)) + StencilBuffer[pixeladdr] = 1; + + continue; + } + if (!fnDepthTest(DepthBuffer[pixeladdr], z)) continue; @@ -919,8 +961,6 @@ void RenderPolygon(Polygon* polygon) s16 t = interpX.Interpolate(tl, tr); u32 color = RenderPixel(polygon, vr>>3, vg>>3, vb>>3, s, t); - u32 attr = polygon->Attr & 0x3F008000; - u8 alpha = color >> 24; // alpha test @@ -952,11 +992,13 @@ void RenderPolygon(Polygon* polygon) { u32 dstattr = AttrBuffer[pixeladdr]; attr |= (1<<30); + if (polygon->IsShadow) dstattr |= (1<<30); // skip if polygon IDs are equal // note: this only happens if the destination pixel was translucent - // the GPU keeps track of which pixels are translucent, regardless of - // the destination alpha + // or always when drawing a shadow + // (the GPU keeps track of which pixels are translucent, regardless of + // the destination alpha) if ((dstattr & 0x7F000000) == (attr & 0x7F000000)) continue; |