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20 lines
609 B
C
20 lines
609 B
C
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#include "pspmath.h"
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// simple ease in/out function
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// input will be clamped to range of 0 < t < 1
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float vfpu_ease_in_out(float t) {
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float r;
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__asm__ volatile (
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"mtv %1, S000\n"
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"vmov.q C000[0:1,,,], C000[x, 2, 1, 1/2]\n" // C000 = [0<t<1, 2, 1, 1/2]
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"vmul.s S000, S000, S001\n" // raise S000 to 0..2 range
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"vsub.s S000, S000, S002\n" // S000 now in -1 to 1 range
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"vsin.s S000, S000\n" // S000 = sin(S000)
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"vmul.s S000, S000, S003\n" // S000 = sin(t)/2
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"vadd.s S000, S000, S003\n" // S000 = 0.5 + sin(t)/2
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"mfv %0, S000\n"
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: "=r"(r) : "r"(t));
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return r;
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}
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