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- Fix pixel center sampling bug in SWCanvas::DrawTexture

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This commit is contained in:
Magnus Norddahl 2017-07-22 10:40:30 +02:00
parent c56cd245ac
commit 3ff021608d
1 changed files with 3 additions and 1 deletions
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4
src/swrenderer/r_swcanvas.cpp
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@ -128,7 +128,7 @@ void SWCanvas::DrawTexture(DCanvas *canvas, FTexture *img, DrawParms &parms)
// There is not enough precision in the drawing routines to keep the full
// precision for y0. :(
double sprtopscreen;
modf(y0, &sprtopscreen);
modf(y0 + 0.5, &sprtopscreen);
double yscale = parms.destheight / img->GetHeight();
double iyscale = 1 / yscale;
@ -192,6 +192,8 @@ void SWCanvas::DrawTexture(DCanvas *canvas, FTexture *img, DrawParms &parms)
int x2_i = int(x2);
fixed_t xiscale_i = FLOAT2FIXED(xiscale);
frac += xiscale_i / 2;
while (x < x2_i)
{
drawerargs.DrawMaskedColumn(&thread, x, iscale, img, frac, spryscale, sprtopscreen, sprflipvert, mfloorclip, mceilingclip, !parms.masked);