Experiment: remove global.h dependency from sys_math, sys_math3d, z_lib (#1956)

* split sys_math, sys_math3d, z_lib from global.h

* suggestions

* forgot this

* more math stuff

* nit fix

* re-add ichain.h

* resolve tharo's comments

1 files changed, 0 insertions, 176 deletions

diff --git a/src/code/code_800FCE80.c b/src/code/code_800FCE80.c
deleted file mode 100644
index 8ac46833d..000000000
--- a/src/code/code_800FCE80.c
+++ /dev/null
@@ -1,176 +0,0 @@
-#include "global.h"
-
-s32 gUseAtanContFrac;
-
-/**
- * @param angle radians
- * @return tan(angle)
- */
-f32 Math_FTanF(f32 angle) {
-    f32 sin = sinf(angle);
-    f32 cos = cosf(angle);
-
-    return sin / cos;
-}
-
-f32 Math_FFloorF(f32 x) {
-    return floorf(x);
-}
-
-f32 Math_FCeilF(f32 x) {
-    return ceilf(x);
-}
-
-f32 Math_FRoundF(f32 x) {
-    return roundf(x);
-}
-
-f32 Math_FTruncF(f32 x) {
-    return truncf(x);
-}
-
-f32 Math_FNearbyIntF(f32 x) {
-    return nearbyintf(x);
-}
-
-/* Arctangent approximation using a Taylor series (one quadrant) */
-f32 Math_FAtanTaylorQF(f32 x) {
-    static const f32 coeffs[] = {
-        -1.0f / 3, +1.0f / 5, -1.0f / 7, +1.0f / 9, -1.0f / 11, +1.0f / 13, -1.0f / 15, +1.0f / 17, 0.0f,
-    };
-
-    f32 poly = x;
-    f32 sq = SQ(x);
-    f32 exp = x * sq;
-    const f32* c = coeffs;
-    f32 term;
-
-    while (true) {
-        term = *c++ * exp;
-        if (poly + term == poly) {
-            break;
-        }
-        poly += term;
-        exp *= sq;
-    }
-
-    return poly;
-}
-
-/* Ditto for two quadrants */
-f32 Math_FAtanTaylorF(f32 x) {
-    f32 t;
-    f32 q;
-
-    if (x > 0.0f) {
-        t = x;
-    } else if (x < 0.0f) {
-        t = -x;
-    } else if (x == 0.0f) {
-        return 0.0f;
-    } else {
-        return qNaN0x10000;
-    }
-
-    if (t <= M_SQRT2 - 1.0f) {
-        return Math_FAtanTaylorQF(x);
-    }
-
-    if (t >= M_SQRT2 + 1.0f) {
-        q = M_PI / 2 - Math_FAtanTaylorQF(1.0f / t);
-    } else {
-        q = M_PI / 4 - Math_FAtanTaylorQF((1.0f - t) / (1.0f + t));
-    }
-
-    if (x > 0.0f) {
-        return q;
-    } else {
-        return -q;
-    }
-}
-
-/* Arctangent approximation using a continued fraction */
-f32 Math_FAtanContFracF(f32 x) {
-    s32 sector;
-    f32 z;
-    f32 conv;
-    f32 sq;
-    s32 i;
-
-    if (x >= -1.0f && x <= 1.0f) {
-        sector = 0;
-    } else if (x > 1.0f) {
-        sector = 1;
-        x = 1.0f / x;
-    } else if (x < -1.0f) {
-        sector = -1;
-        x = 1.0f / x;
-    } else {
-        return qNaN0x10000;
-    }
-
-    sq = SQ(x);
-    conv = 0.0f;
-    z = 8.0f;
-    for (i = 8; i != 0; i--) {
-        conv = SQ(z) * sq / (2.0f * z + 1.0f + conv);
-        z -= 1.0f;
-    }
-    conv = x / (1.0f + conv);
-
-    if (sector == 0) {
-        return conv;
-    } else if (sector > 0) {
-        return M_PI / 2 - conv;
-    } else {
-        return -M_PI / 2 - conv;
-    }
-}
-
-/**
- * @return arctan(x) in radians, in (-pi/2,pi/2) range
- */
-f32 Math_FAtanF(f32 x) {
-    if (!gUseAtanContFrac) {
-        return Math_FAtanTaylorF(x);
-    } else {
-        return Math_FAtanContFracF(x);
-    }
-}
-
-/**
- * @return angle to (x,y) from vector (1,0) around (0,0) in radians, in (-pi,pi] range
- */
-f32 Math_FAtan2F(f32 y, f32 x) {
-    if (x == 0.0f) {
-        if (y == 0.0f) {
-            return 0.0f;
-        } else if (y > 0.0f) {
-            return M_PI / 2;
-        } else if (y < 0.0f) {
-            return -M_PI / 2;
-        } else {
-            return qNaN0x10000;
-        }
-    } else if (x >= 0.0f) {
-        return Math_FAtanF(y / x);
-    } else if (y < 0.0f) {
-        return Math_FAtanF(y / x) - M_PI;
-    } else {
-        return M_PI - Math_FAtanF(-(y / x));
-    }
-}
-
-/**
- * @return arcsin(x) in radians, in [-pi/2,pi/2] range
- */
-f32 Math_FAsinF(f32 x) {
-    return Math_FAtan2F(x, sqrtf(1.0f - SQ(x)));
-}
-
-/**
- * @return arccos(x) in radians, in [0,pi] range
- */
-f32 Math_FAcosF(f32 x) {
-    return M_PI / 2 - Math_FAsinF(x);
-}