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light: fence texture tracing: fix handling of negative texture coords

This commit is contained in:
Eric Wasylishen 2015-06-24 17:46:56 -06:00
parent e242a9c910
commit 6ca1c6957a
1 changed files with 16 additions and 2 deletions
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18
light/trace.c
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@ -170,6 +170,20 @@ MiptexForFace(const bsp2_dface_t *face, const bsp2_t *bsp)
return miptex;
}
vec_t fix_coord(vec_t in, int width)
{
if (in > 0)
{
return (int)in % width;
}
else
{
vec_t in_abs = fabs(in);
int in_abs_mod = (int)in_abs % width;
return width - in_abs_mod;
}
}
static int
SampleTexture(const bsp2_dface_t *face, const bsp2_t *bsp, const vec3_t point)
{
@ -191,8 +205,8 @@ SampleTexture(const bsp2_dface_t *face, const bsp2_t *bsp, const vec3_t point)
miptex = (miptex_t*)(bsp->dtexdata.base + miplump->dataofs[tex->miptex]);
x = (int)texcoord[0] % miptex->width;
y = (int)texcoord[1] % miptex->height;
x = fix_coord(texcoord[0], miptex->width);
y = fix_coord(texcoord[1], miptex->height);
data = (byte*)miptex + miptex->offsets[0];
sample = data[(miptex->width * y) + x];