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- fixed: y-clamped textures with negative scale need to shift their texture coordinates into the proper [0..1] range.

This commit is contained in:
Christoph Oelckers 2014-12-26 11:53:38 +01:00
parent c39e962fd5
commit fbfe0f1e7a
1 changed files with 19 additions and 11 deletions
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18
src/gl/scene/gl_walls.cpp
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@ -640,17 +640,25 @@ bool GLWall::SetWallCoordinates(seg_t * seg, FTexCoordInfo *tci, float textureto
uplft.u = lolft.u = l_ul + texlength * glseg.fracleft; uplft.u = lolft.u = l_ul + texlength * glseg.fracleft;
uprgt.u = lorgt.u = l_ul + texlength * glseg.fracright; uprgt.u = lorgt.u = l_ul + texlength * glseg.fracright;
if (gltexture != NULL)
if (gltexture && gltexture->tex->bHasCanvas && flags&GLT_CLAMPY)
{ {
// Camera textures are upside down so we have to shift the y-coordinate bool normalize = false;
// from [-1..0] to [0..1] when using texture clamping if (gltexture->tex->bHasCanvas) normalize = true;
else if (flags & GLT_CLAMPY)
{
// for negative scales we can get negative coordinates here.
normalize = (uplft.v > lolft.v || uprgt.v > lorgt.v);
}
if (normalize)
{
// we have to shift the y-coordinate from [-1..0] to [0..1] when using texture clamping with a negative scale
uplft.v+=1.f; uplft.v+=1.f;
uprgt.v+=1.f; uprgt.v+=1.f;
lolft.v+=1.f; lolft.v+=1.f;
lorgt.v+=1.f; lorgt.v+=1.f;
} }
}
return true; return true;
} }