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- Stop using sqrt when calculating texture coordinates

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This commit is contained in:
Magnus Norddahl 2017-05-13 15:48:55 +02:00
parent a8e379553e
commit 0a4f4aaffd
1 changed files with 13 additions and 9 deletions
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22
src/polyrenderer/scene/poly_wall.cpp
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@ -363,20 +363,24 @@ int RenderPolyWall::GetLightLevel()
PolyWallTextureCoordsU::PolyWallTextureCoordsU(FTexture *tex, const seg_t *lineseg, const line_t *line, const side_t *side, side_t::ETexpart texpart)
{
double lineLength = side->TexelLength;
double lineStart = 0.0;
bool entireSegment = ((lineseg->v1 == line->v1) && (lineseg->v2 == line->v2)) || ((lineseg->v2 == line->v1) && (lineseg->v1 == line->v2));
if (!entireSegment)
double t1, t2;
double deltaX = line->v2->fX() - line->v1->fX();
double deltaY = line->v2->fY() - line->v1->fY();
if (fabs(deltaX) > fabs(deltaY))
{
lineLength = (lineseg->v2->fPos() - lineseg->v1->fPos()).Length();
lineStart = (lineseg->v1->fPos() - line->v1->fPos()).Length();
t1 = (lineseg->v1->fX() - line->v1->fX()) / deltaX;
t2 = (lineseg->v2->fX() - line->v1->fX()) / deltaX;
}
else
{
t1 = (lineseg->v1->fY() - line->v1->fY()) / deltaY;
t2 = (lineseg->v2->fY() - line->v1->fY()) / deltaY;
}
int texWidth = tex->GetWidth();
double uscale = side->GetTextureXScale(texpart) * tex->Scale.X;
u1 = lineStart + side->GetTextureXOffset(texpart);
u2 = u1 + lineLength;
u1 = t1 * side->TexelLength + side->GetTextureXOffset(texpart);
u2 = t2 * side->TexelLength + side->GetTextureXOffset(texpart);
u1 *= uscale;
u2 *= uscale;
u1 /= texWidth;