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correct VRAM emulation.

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there is room for optimizations esp. in the GPU drawing routines.
This commit is contained in:
StapleButter
2017-02-27 21:26:11 +01:00
parent dadf1eb5a5
commit 8c2572e354
7 changed files with 776 additions and 616 deletions
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32
GPU3D_Soft.cpp
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@ -72,6 +72,7 @@ void RenderPixel(u32 attr, s32 x, s32 y, s32 z, u8 vr, u8 vg, u8 vb)
pixel[3] = 31; // TODO: alpha
// TODO: optional update for translucent pixels
if (z > 0xFFFFFF) z = 0xFFFFFF;
*depth = z;
}
@ -128,9 +129,12 @@ void RenderPolygon(Polygon* polygon)
vtx->FinalPosition[2] = posZ;
vtx->FinalPosition[3] = posW;
vtx->FinalColor[0] = vtx->Color[0] ? (((vtx->Color[0] >> 12) << 4) + 0xF) : 0;
vtx->FinalColor[1] = vtx->Color[1] ? (((vtx->Color[1] >> 12) << 4) + 0xF) : 0;
vtx->FinalColor[2] = vtx->Color[2] ? (((vtx->Color[2] >> 12) << 4) + 0xF) : 0;
vtx->FinalColor[0] = vtx->Color[0] >> 12;
if (vtx->FinalColor[0]) vtx->FinalColor[0] = ((vtx->FinalColor[0] << 4) + 0xF);
vtx->FinalColor[1] = vtx->Color[1] >> 12;
if (vtx->FinalColor[1]) vtx->FinalColor[1] = ((vtx->FinalColor[1] << 4) + 0xF);
vtx->FinalColor[2] = vtx->Color[2] >> 12;
if (vtx->FinalColor[2]) vtx->FinalColor[2] = ((vtx->FinalColor[2] << 4) + 0xF);
vtx->ViewportTransformDone = true;
}
@ -238,19 +242,24 @@ void RenderPolygon(Polygon* polygon)
s32 lfactor, rfactor;
// TODO: work out the actual division bias there. 0x400 was found to make things look good.
// but actually, it isn't right. so what's going on there?
// seems vertical slopes are interpolated starting from the bottom and not the top. maybe.
// also seems lfactor/rfactor are rounded
if (vlnext->FinalPosition[1] == vlcur->FinalPosition[1])
lfactor = 0;
else
lfactor = ((y - vlcur->FinalPosition[1]) << 12) / (vlnext->FinalPosition[1] - vlcur->FinalPosition[1]);
lfactor = (((y - vlcur->FinalPosition[1]) << 12) + 0x00) / (vlnext->FinalPosition[1] - vlcur->FinalPosition[1]);
if (vrnext->FinalPosition[1] == vrcur->FinalPosition[1])
rfactor = 0;
else
rfactor = ((y - vrcur->FinalPosition[1]) << 12) / (vrnext->FinalPosition[1] - vrcur->FinalPosition[1]);
rfactor = (((y - vrcur->FinalPosition[1]) << 12) + 0x00) / (vrnext->FinalPosition[1] - vrcur->FinalPosition[1]);
s32 xl = vlcur->FinalPosition[0] + (((vlnext->FinalPosition[0] - vlcur->FinalPosition[0]) * lfactor) >> 12);
s32 xr = vrcur->FinalPosition[0] + (((vrnext->FinalPosition[0] - vrcur->FinalPosition[0]) * rfactor) >> 12);
//printf("y:%d xl:%d xr:%d %08X\n", y, xl, xr, rfactor); // y: 48 143
if (xl > xr) // TODO: handle it in a more elegant way
{
Vertex* vtmp;
@ -270,7 +279,7 @@ void RenderPolygon(Polygon* polygon)
continue; // hax
}
s32 zl = vlcur->FinalPosition[2] + (((s64)(vlnext->FinalPosition[2] -vlcur->FinalPosition[2]) * lfactor) >> 12);
s32 zl = vlcur->FinalPosition[2] + (((s64)(vlnext->FinalPosition[2] - vlcur->FinalPosition[2]) * lfactor) >> 12);
s32 zr = vrcur->FinalPosition[2] + (((s64)(vrnext->FinalPosition[2] - vrcur->FinalPosition[2]) * rfactor) >> 12);
s32 wl = vlcur->FinalPosition[3] + (((s64)(vlnext->FinalPosition[3] - vlcur->FinalPosition[3]) * lfactor) >> 12);
@ -303,8 +312,11 @@ void RenderPolygon(Polygon* polygon)
if (xr == xl) xr++;
s32 xdiv = 0x1000 / (xr - xl);
//printf("y%d: %d->%d %08X %08X\n", y, xl, xr, lfactor, rfactor);
for (s32 x = xl; x < xr; x++)
{
//s32 xfactor = ((x - xl) << 12) / (xr - xl);
s32 xfactor = (x - xl) * xdiv;
s32 z = zl + (((s64)(zr - zl) * xfactor) >> 12);
@ -327,12 +339,6 @@ void RenderPolygon(Polygon* polygon)
u32 vb = ((perspfactor1 * bl) + (perspfactor2 * br)) / (perspfactor1 + perspfactor2);
RenderPixel(polygon->Attr, x, y, z, vr>>3, vg>>3, vb>>3);
// Z debug
/*u8 zerp = (w * 63) / 0xFFFFFF;
pixel[0] = zerp;
pixel[1] = zerp;
pixel[2] = zerp;*/
}
}