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Fix mappings related to MathHelper.atan2 (#3570) 

* Fix mixed up getRed/getBlue names in ColorHelper.Abgr (#3541)

* Fix mappings related to MathHelper.atan2

---------

Co-authored-by: kb1000 <kaeptmblaubaer1000@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: modmuss50 <modmuss50@gmail.com>
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Tae Lim Kook 2023-05-11 08:57:28 -04:00 committed by GitHub
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commit 82d721d9a4
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1 changed files with 42 additions and 2 deletions
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44
mappings/net/minecraft/util/math/MathHelper.mapping
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@ -4,13 +4,32 @@ CLASS net/minecraft/class_3532 net/minecraft/util/math/MathHelper
COMMENT
COMMENT <p>Trigonometric functions defined in this class use the "sine table", a pre-calculated
COMMENT table of {@code sin(N)} ({@code 0 <= N < pi * 2}).
FIELD field_15722 COSINE_TABLE [D
FIELD field_15722 COSINE_OF_ARCSINE_TABLE [D
COMMENT Holds values of cos(arcsin(x)): {@code COSINE_OF_ARCSINE_TABLE[i]} is equal to
COMMENT {@code Math.cos(Math.arcsin(i / 256.0))}.
COMMENT
COMMENT <p>This is used by {@link MathHelper#atan2} to approximate the inverse
COMMENT tangent function.
FIELD field_15723 MULTIPLY_DE_BRUIJN_BIT_POSITION [I
FIELD field_15724 SQUARE_ROOT_OF_TWO F
FIELD field_15725 SINE_TABLE [F
FIELD field_15726 RANDOM Lnet/minecraft/class_5819;
FIELD field_15727 ARCSINE_TABLE [D
FIELD field_15728 SMALLEST_FRACTION_FREE_DOUBLE D
COMMENT Holds values of arcsin(x): {@code ARCSINE_TABLE[i]} is equal to
COMMENT {@code Math.arcsin(i / 256.0)}.
COMMENT
COMMENT <p>This is used by {@link MathHelper#atan2} to approximate the inverse
COMMENT tangent function.
FIELD field_15728 ROUNDER_256THS D
COMMENT A constant for rounding a double to the nearest multiple of 1/256.
COMMENT
COMMENT <p>When this constant is added to a double that is not too large, then the
COMMENT bits of the result's mantissa reflect the original number times 256.
COMMENT Consequently, adding this constant and then subtracting it rounds such
COMMENT doubles to the nearest multiple of 1/256.
COMMENT
COMMENT <p>This is used by {@link MathHelper#atan2} to produce an index into
COMMENT {@link MathHelper#ARCSINE_TABLE} and {@link MathHelper#COSINE_OF_ARCSINE_TABLE}.
FIELD field_29844 PI F
FIELD field_29845 HALF_PI F
FIELD field_29846 TAU F
@ -20,6 +39,15 @@ CLASS net/minecraft/class_3532 net/minecraft/util/math/MathHelper
FIELD field_29849 EPSILON F
FIELD field_29853 HALF_PI_RADIANS_SINE_TABLE_INDEX J
FIELD field_29856 DEGREES_TO_SINE_TABLE_INDEX F
FIELD field_29857 ARCSINE_MACLAURIN_3 D
COMMENT Used for the third-order Maclaurin series approximation of the arcsin function,
COMMENT x + x^3/6.
FIELD field_29859 ARCSINE_TABLE_LENGTH I
COMMENT The total number of entries in {@link MathHelper#ARCSINE_TABLE} and
COMMENT {@link MathHelper#COSINE_OF_ARCSINE_TABLE}.
COMMENT
COMMENT <p>These tables have 257 elements because they store values for multiples of
COMMENT 1/256 from 0 to 1, inclusive.
METHOD method_15338 wrapDegrees (D)D
COMMENT Wraps an angle in degrees to the interval {@code [-180, 180)}.
ARG 0 degrees
@ -59,6 +87,18 @@ CLASS net/minecraft/class_3532 net/minecraft/util/math/MathHelper
ARG 1 to
ARG 2 step
METHOD method_15349 atan2 (DD)D
COMMENT {@return an approximation of {@code Math.atan2(y, x)}}
COMMENT
COMMENT @implNote This implementation transforms the arguments such that they
COMMENT lie in the first quadrant. If {@code y > x}, then {@code x} and {@code y}
COMMENT are swapped to minimize the error of the initial approximation.
COMMENT {@code x} and {@code y} are normalized, and an initial approximation
COMMENT of the result and the sine of the deviation from the true value are
COMMENT obtained using the {@link MathHelper#ARCSINE_TABLE} and
COMMENT {@link MathHelper#COSINE_OF_ARCSINE_TABLE} lookup tables. The error
COMMENT itself is approximated using the third-order Maclaurin series polynomial
COMMENT for arcsin. Finally, the implementation undoes any transformations that
COMMENT were performed initially.
ARG 0 y
ARG 2 x
METHOD method_15350 clamp (DDD)D