69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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//
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// Created by Wouter Groeneveld on 08/07/20.
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//
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#ifndef GBA_BITMAP_ENGINE_PROJECT_MATH_H
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#define GBA_BITMAP_ENGINE_PROJECT_MATH_H
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#include <libgba-sprite-engine/gba/tonc_types.h>
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#ifdef CODE_COMPILED_AS_PART_OF_TEST
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#include <libgba-sprite-engine/gba/tonc_math_stub.h>
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#else
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#include <libgba-sprite-engine/gba/tonc_math.h>
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#endif
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// fixed point math things that were missing from TONC
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extern FIXED HALF;
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extern FIXED ONE;
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// -----
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INLINE float gr2rad(uint grad);
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INLINE FIXED gr2lut(uint grad);
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INLINE FIXED rad2lut(float rad);
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INLINE FIXED fxrad2lut(FIXED rad);
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INLINE float fx12ToFloat(FIXED fx);
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INLINE FIXED fx12Tofx8(FIXED fx12);
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INLINE FIXED fxtan(FIXED fxrad);
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INLINE float rnd(float val);
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// ---- impl
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INLINE float rnd(float val) {
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return (float) ((std::floor(val * 100) + .5) / 100);
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}
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INLINE float gr2rad(uint grad) {
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return grad*M_PI/180;
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}
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INLINE FIXED gr2lut(uint grad) {
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return 65535 / (360 / grad);
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}
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INLINE FIXED rad2lut(float rad) {
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return gr2lut(rad * 180 / M_PI);
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}
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INLINE FIXED fxrad2lut(FIXED rad) {
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// TODO NOT good; too much divisions, but hey, fuck it
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return rad2lut(fx2float(rad));
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}
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INLINE float fx12ToFloat(FIXED fx) {
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return fx / (float) (1<<12);
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}
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INLINE FIXED fx12Tofx8(FIXED fx12) {
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return fx12 >> 4;
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}
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INLINE FIXED fxtan(FIXED fxrad) {
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FIXED theta = fxrad2lut(fxrad);
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FIXED sin = fx12Tofx8(lu_sin(theta));
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FIXED cos = fx12Tofx8(lu_cos(theta));
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return fxdiv(sin, cos);
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}
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#endif //GBA_BITMAP_ENGINE_PROJECT_MATH_H
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