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* fix overflows during fixed-point multiply

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* small fix to SwapBuffers
This commit is contained in:
StapleButter
2017-02-13 14:59:51 +01:00
parent 361ddd7595
commit fb53fd5195
3 changed files with 104 additions and 76 deletions
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22
GPU3D_Soft.cpp
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@ -102,7 +102,7 @@ void RenderPolygon(Polygon* polygon)
vbot = i;
}
//if (vtx->Color[0]==63 && vtx->Color[1]==0 && vtx->Color[2]==0)
//printf("v%d: %d,%d W=%d\n", i, scrX, 191-scrY, vtx->Position[3]);
//printf("v%d: %d,%d Z=%f W=%f\n", i, scrX, 191-scrY, vtx->Position[2]/4096.0f, vtx->Position[3]/4096.0f);
}
// draw, line per line
@ -176,11 +176,16 @@ void RenderPolygon(Polygon* polygon)
s32 xl = scrcoords[lcur][0] + (((scrcoords[lnext][0] - scrcoords[lcur][0]) * lfactor) >> 12);
s32 xr = scrcoords[rcur][0] + (((scrcoords[rnext][0] - scrcoords[rcur][0]) * rfactor) >> 12);
//if (vlcur->Color[0]==0 && vlcur->Color[1]==63 && vlcur->Color[2]==0)
// printf("y:%d xleft:%d xright:%d %d,%d %d,%d\n", y, xl, xr, lcur, rcur, vtop, vbot);
if (xl<0 || xr>255) continue; // hax
//s32 zl = scrcoords[lcur][3] + (((scrcoords[lnext][3] - scrcoords[lcur][3]) * lfactor) >> 12);
//s32 zr = scrcoords[rcur][3] + (((scrcoords[rnext][3] - scrcoords[rcur][3]) * rfactor) >> 12);
//if (vlcur->Color[0]==0 && vlcur->Color[1]==63 && vlcur->Color[2]==0)
/*printf("y:%d xleft:%d xright:%d %d,%d %d,%d | left: %d to %d right: %d to %d\n",
y, xl, xr, lcur, rcur, vtop, vbot,
scrcoords[lcur][0], scrcoords[lnext][0],
scrcoords[rcur][0], scrcoords[rnext][0]);*/
//s32 zl = scrcoords[lcur][2] + (((scrcoords[lnext][2] - scrcoords[lcur][2]) * lfactor) >> 12);
//s32 zr = scrcoords[rcur][2] + (((scrcoords[rnext][2] - scrcoords[rcur][2]) * rfactor) >> 12);
u8 rl = vlcur->Color[0] + (((vlnext->Color[0] - vlcur->Color[0]) * lfactor) >> 12);
u8 gl = vlcur->Color[1] + (((vlnext->Color[1] - vlcur->Color[1]) * lfactor) >> 12);
@ -200,12 +205,12 @@ void RenderPolygon(Polygon* polygon)
{
s32 xfactor = (x - xl) * xdiv;
//s32 z = (zl << 12) + ((zr - zl) * xfactor);
//z = zl + (((zr - zl) * xfactor) >> 12);
//s32 z = (((zr - zl) * xfactor) >> 12);
//if (zr!=zl) z = (z << 12) / (zr - zl);
//s32 z_inv = ((z>>12)==0) ? 0x1000 : 0x1000000 / (z >> 12);
//xfactor = (xfactor * z_inv) >> 12;
//xfactor = (xfactor << 12) / z;
//if (z) xfactor = (xfactor << 12) / z;
// TODO: get rid of this shit
if (x<0 || x>255 || y<0 || y>191)
@ -248,6 +253,7 @@ void RenderFrame(Vertex* vertices, Polygon* polygons, int npolys)
polygons[i].Vertices[j]->Position[1]/4096.0f,
polygons[i].Vertices[j]->Position[2]/4096.0f);
*/
//printf("polygon %d\n", i);
RenderPolygon(&polygons[i]);
}
}