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Improve parallax mirroring algorithm

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Replaces the iterative approach currently used by the standard fmod() function.
Also fixes infinite looping that happens when the mirroring value is negative.
This commit is contained in:
Pedro J. Estébanez 2016-06-24 18:39:56 +02:00
parent 9e0b6057e7
commit fbddc0b747
1 changed files with 4 additions and 14 deletions
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18
scene/2d/parallax_layer.cpp
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@ -92,23 +92,13 @@ void ParallaxLayer::set_base_offset_and_scale(const Point2& p_offset,float p_sca
Point2 new_ofs = ((orig_offset+p_offset)*motion_scale)*p_scale;
if (mirroring.x) {
while( new_ofs.x>=0) {
new_ofs.x -= mirroring.x*p_scale;
}
while(new_ofs.x < -mirroring.x*p_scale) {
new_ofs.x += mirroring.x*p_scale;
}
double den = mirroring.x*p_scale;
new_ofs.x = fmod(new_ofs.x,den) - (mirroring.x > 0 ? den : 0);
}
if (mirroring.y) {
while( new_ofs.y>=0) {
new_ofs.y -= mirroring.y*p_scale;
}
while(new_ofs.y < -mirroring.y*p_scale) {
new_ofs.y += mirroring.y*p_scale;
}
double den = mirroring.y*p_scale;
new_ofs.y = fmod(new_ofs.y,den) - (mirroring.y > 0 ? den : 0);
}