matthew/The-Powder-Toy
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PHOT reflection now works as it did prior to 920f7646e4

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This fixes many saves that use 1-px mirrors, for example, id:1077513 id:828603 id:2845200 id:30082

PHOT refraction, which was wildly broken in 97.0, is unchanged, and still works. In Simulation::get_normal, I simply check if REFRACT is set, and if it is, apply the new logic
This commit is contained in:
jacob1 2023-12-22 22:28:02 -05:00
parent 3ecc1c6c6f
commit d2655fa195
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GPG Key ID: 4E58A32D510E1995
1 changed files with 34 additions and 4 deletions
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38
src/simulation/Simulation.cpp
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@ -1526,6 +1526,35 @@ void Simulation::photoelectric_effect(int nx, int ny)//create sparks from PHOT w
}
}
unsigned static direction_to_map(float dx, float dy, int t)
{
// TODO:
// Adding extra directions causes some inaccuracies.
// Not adding them causes problems with some diagonal surfaces (photons absorbed instead of reflected).
// For now, don't add them.
// Solution may involve more intelligent setting of initial i0 value in find_next_boundary?
// or rewriting normal/boundary finding code
return (dx >= 0) |
(((dx + dy) >= 0) << 1) | /* 567 */
((dy >= 0) << 2) | /* 4+0 */
(((dy - dx) >= 0) << 3) | /* 321 */
((dx <= 0) << 4) |
(((dx + dy) <= 0) << 5) |
((dy <= 0) << 6) |
(((dy - dx) <= 0) << 7);
/*
return (dx >= -0.001) |
(((dx + dy) >= -0.001) << 1) | // 567
((dy >= -0.001) << 2) | // 4+0
(((dy - dx) >= -0.001) << 3) | // 321
((dx <= 0.001) << 4) |
(((dx + dy) <= 0.001) << 5) |
((dy <= 0.001) << 6) |
(((dy - dx) <= 0.001) << 7);
}*/
}
int Simulation::is_blocking(int t, int x, int y) const
{
if (t & REFRACT) {
@ -1567,7 +1596,7 @@ int Simulation::find_next_boundary(int pt, int *x, int *y, int dm, int *em, bool
unsigned int mask = 0;
for (int i = 0; i < 8; ++i)
{
if (is_blocking(pt, *x + dx[i], *y + dy[i]))
if ((dm & (1U << i)) && is_blocking(pt, *x + dx[i], *y + dy[i]))
{
mask |= (1U << i);
}
@ -1575,7 +1604,7 @@ int Simulation::find_next_boundary(int pt, int *x, int *y, int dm, int *em, bool
for (int i = 0; i < 8; ++i)
{
int n = (i + (reverse ? 1 : -1)) & 7;
if (((dm & mask & (1U << i))) && !(mask & (1U << n)))
if (((mask & (1U << i))) && !(mask & (1U << n)))
{
*x += dx[i];
*y += dy[i];
@ -1600,8 +1629,8 @@ Simulation::GetNormalResult Simulation::get_normal(int pt, int x, int y, float d
if (!is_boundary(pt, x, y))
return { false };
ldm = 0xFF;
rdm = 0xFF;
ldm = (pt & REFRACT) ? 0xFF : direction_to_map(-dy, dx, pt);
rdm = (pt & REFRACT) ? 0xFF : direction_to_map(dy, -dx, pt);
lx = rx = x;
ly = ry = y;
lv = rv = 1;
@ -2959,6 +2988,7 @@ killed:
}
auto nn = GLASS_IOR - GLASS_DISP*(r-30)/30.0f;
nn *= nn;
auto enter = rt_glas && !lt_glas;
nrx = enter ? -nrx : nrx;
nry = enter ? -nry : nry;