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Renderer floatification: Use floating point for texturemids and Y scales

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This commit is contained in:
Randy Heit 2016-04-15 20:30:05 -05:00
commit 3ef5a678d5
12 changed files with 185 additions and 182 deletions
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21
src/v_draw.cpp
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@ -202,30 +202,23 @@ void DCanvas::DrawTextureParms(FTexture *img, DrawParms &parms)
double centeryback = CenterY;
CenterY = 0;
sprtopscreen = FLOAT2FIXED(y0);
// There is not enough precision in the drawing routines to keep the full
// precision for y0. :(
sprtopscreen &= ~(FRACUNIT - 1);
double dummy;
sprtopscreen = modf(y0, &dummy);
double yscale = parms.destheight / img->GetHeight();
double iyscale = 1 / yscale;
spryscale = FLOAT2FIXED(yscale);
assert(spryscale > 2);
#if 0
// Fix precision errors that are noticeable at some resolutions
if ((y0 + parms.destheight) > (y0 + yscale * img->GetHeight()))
{
spryscale++;
}
#endif
spryscale = yscale;
assert(spryscale > 0);
sprflipvert = false;
//dc_iscale = FLOAT2FIXED(iyscale);
//dc_texturemid = FLOAT2FIXED((-y0) * iyscale);
//dc_texturemid = (-y0) * iyscale;
//dc_iscale = 0xffffffffu / (unsigned)spryscale;
dc_iscale = DivScale32(1, spryscale);
dc_texturemid = FixedMul(-sprtopscreen, dc_iscale) + xs_ToInt((CenterY - 1) * dc_iscale);
dc_iscale = FLOAT2FIXED(1 / spryscale);
dc_texturemid = (CenterY - 1 - sprtopscreen) * dc_iscale / 65536;
fixed_t frac = 0;
double xiscale = img->GetWidth() / parms.destwidth;
double x2 = x0 + parms.destwidth;