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- Use floating point instead of the distrecip() function for slightly less precision loss.

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- Tweak voxel sizes and vertical positioning further.

SVN r3716 (trunk)
This commit is contained in:
Randy Heit 2012-06-29 03:58:26 +00:00
parent 006a0b1641
commit 4a3438499e
1 changed files with 9 additions and 13 deletions
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22
src/r_things.cpp
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@ -2217,12 +2217,6 @@ void R_DrawParticle (vissprite_t *vis)
} while (--ycount); } while (--ycount);
} }
static fixed_t distrecip(fixed_t y)
{
y >>= 3;
return y == 0 ? 0 : SafeDivScale32(centerxwide, y);
}
extern fixed_t baseyaspectmul; extern fixed_t baseyaspectmul;
void R_DrawVoxel(fixed_t dasprx, fixed_t daspry, fixed_t dasprz, angle_t dasprang, void R_DrawVoxel(fixed_t dasprx, fixed_t daspry, fixed_t dasprz, angle_t dasprang,
@ -2244,6 +2238,8 @@ void R_DrawVoxel(fixed_t dasprx, fixed_t daspry, fixed_t dasprz, angle_t daspran
const fixed_t globalposx = viewx >> 12; const fixed_t globalposx = viewx >> 12;
const fixed_t globalposy = -viewy >> 12; const fixed_t globalposy = -viewy >> 12;
const fixed_t globalposz = -viewz >> 8; const fixed_t globalposz = -viewz >> 8;
const double centerxwide_f = centerxwide;
const double centerxwidebig_f = centerxwide_f * 65536*65536*8;
dasprx = dasprx >> 12; dasprx = dasprx >> 12;
daspry = -daspry >> 12; daspry = -daspry >> 12;
@ -2251,8 +2247,8 @@ void R_DrawVoxel(fixed_t dasprx, fixed_t daspry, fixed_t dasprz, angle_t daspran
// Shift the scales from 16 bits of fractional precision to 6. // Shift the scales from 16 bits of fractional precision to 6.
// Also do some magic voodoo scaling to make them the right size. // Also do some magic voodoo scaling to make them the right size.
daxscale = daxscale / (0xC400 >> 6); daxscale = daxscale / (0xC000 >> 6);
dayscale = dayscale / (0xC400 >> 6); dayscale = dayscale / (0xC000 >> 6);
cosang = viewcos >> 2; cosang = viewcos >> 2;
sinang = -viewsin >> 2; sinang = -viewsin >> 2;
@ -2317,7 +2313,7 @@ void R_DrawVoxel(fixed_t dasprx, fixed_t daspry, fixed_t dasprz, angle_t daspran
ggyinc[i] = y; y += gyinc; ggyinc[i] = y; y += gyinc;
} }
syoff = DivScale21(globalposz - dasprz, FixedMul(dazscale, 0xE900)) + (mip->PivotZ << 7); syoff = DivScale21(globalposz - dasprz, FixedMul(dazscale, 0xE800)) + (mip->PivotZ << 7);
yoff = (abs(gxinc) + abs(gyinc)) >> 1; yoff = (abs(gxinc) + abs(gyinc)) >> 1;
for (cnt = 0; cnt < 8; cnt++) for (cnt = 0; cnt < 8; cnt++)
@ -2393,14 +2389,14 @@ void R_DrawVoxel(fixed_t dasprx, fixed_t daspry, fixed_t dasprz, angle_t daspran
voxend = (kvxslab_t *)(slabxoffs + xyoffs[y+1]); voxend = (kvxslab_t *)(slabxoffs + xyoffs[y+1]);
if (voxptr >= voxend) continue; if (voxptr >= voxend) continue;
lx = MulScale32(nx >> 3, distrecip(ny+y1)) + centerx; lx = xs_RoundToInt(nx * centerxwide_f / (ny + y1)) + centerx;
if (lx < 0) lx = 0; if (lx < 0) lx = 0;
rx = MulScale32((nx + nxoff) >> 3, distrecip(ny+y2)) + centerx; rx = xs_RoundToInt((nx + nxoff) * centerxwide_f / (ny + y2)) + centerx;
if (rx > viewwidth) rx = viewwidth; if (rx > viewwidth) rx = viewwidth;
if (rx <= lx) continue; if (rx <= lx) continue;
fixed_t l1 = distrecip(ny-yoff); fixed_t l1 = xs_RoundToInt(centerxwidebig_f / (ny - yoff));
fixed_t l2 = distrecip(ny+yoff); fixed_t l2 = xs_RoundToInt(centerxwidebig_f / (ny + yoff));
for (; voxptr < voxend; voxptr = (kvxslab_t *)((BYTE *)voxptr + voxptr->zleng + 3)) for (; voxptr < voxend; voxptr = (kvxslab_t *)((BYTE *)voxptr + voxptr->zleng + 3))
{ {
const BYTE *col = voxptr->col; const BYTE *col = voxptr->col;