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Improve parallax mirroring algorithm

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Replaces the iterative approach currently used by an equivalent direct computation.
Also fixes infinite looping that happens when the mirroring value is negative.
This commit is contained in:
Pedro J. Estébanez 2016-06-27 10:32:14 +02:00
parent 2c59f77885
commit 6ce47d9b51
1 changed files with 4 additions and 15 deletions
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19
scene/2d/parallax_layer.cpp
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@ -123,26 +123,15 @@ 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+motion_offset; Point2 new_ofs = ((orig_offset+p_offset)*motion_scale)*p_scale+motion_offset;
if (mirroring.x) { if (mirroring.x) {
double den = mirroring.x*p_scale;
while( new_ofs.x>=0) { new_ofs.x -= den*ceil(new_ofs.x/den);
new_ofs.x -= mirroring.x*p_scale;
}
while(new_ofs.x < -mirroring.x*p_scale) {
new_ofs.x += mirroring.x*p_scale;
}
} }
if (mirroring.y) { if (mirroring.y) {
double den = mirroring.y*p_scale;
while( new_ofs.y>=0) { new_ofs.y -= den*ceil(new_ofs.y/den);
new_ofs.y -= mirroring.y*p_scale;
}
while(new_ofs.y < -mirroring.y*p_scale) {
new_ofs.y += mirroring.y*p_scale;
}
} }
set_pos(new_ofs); set_pos(new_ofs);
set_scale(Vector2(1,1)*p_scale); set_scale(Vector2(1,1)*p_scale);