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Changed float percentage mathematics in destroyed-kart.cpp into approximated fixed mathematics that will not risk a desync across platforms with different float standards

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Jack 2024-09-07 17:55:30 +01:00
parent af16e3f993
commit 40b231ff62
1 changed files with 6 additions and 2 deletions
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8
src/objects/destroyed-kart.cpp
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@ -332,8 +332,12 @@ struct Kart : Mobj
if(hasCustomHusk){
flags |= MF_NOSQUISH; //K_Squish() automates spritexscale/spriteyscale & this flag prevents that at the cost of no squish visual when the kart husk hits the ground
float div = ((float)1/(float)oldScale)*(float)scale();
auto formula = [&](fixed_t subject){return (fixed_t)((float)subject/div);};
//approximate inverse spritescale() by exaggerating fixed_t values by 100 and then dividing back down instead of doing float maths
//this way there's no decimal points and no potential for desyncs across builds/platforms
//there is potential this could overflow at exceptionally high scale() values
fixed_t z = FixedDiv(FixedMul(scale(),100),oldScale);
auto formula = [&](fixed_t subject){return FixedDiv(FixedMul(subject,100),z);};
spritexscale(formula(spritexscale()));
spriteyscale(formula(spriteyscale()));
}