mirror of
https://github.com/nzp-team/dquakeplus.git
synced 2024-11-23 04:12:04 +00:00
19 lines
609 B
C
19 lines
609 B
C
#include "pspmath.h"
|
|
|
|
// simple ease in/out function
|
|
// input will be clamped to range of 0 < t < 1
|
|
|
|
float vfpu_ease_in_out(float t) {
|
|
float r;
|
|
__asm__ volatile (
|
|
"mtv %1, S000\n"
|
|
"vmov.q C000[0:1,,,], C000[x, 2, 1, 1/2]\n" // C000 = [0<t<1, 2, 1, 1/2]
|
|
"vmul.s S000, S000, S001\n" // raise S000 to 0..2 range
|
|
"vsub.s S000, S000, S002\n" // S000 now in -1 to 1 range
|
|
"vsin.s S000, S000\n" // S000 = sin(S000)
|
|
"vmul.s S000, S000, S003\n" // S000 = sin(t)/2
|
|
"vadd.s S000, S000, S003\n" // S000 = 0.5 + sin(t)/2
|
|
"mfv %0, S000\n"
|
|
: "=r"(r) : "r"(t));
|
|
return r;
|
|
}
|