111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
//
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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-bitmap-engine/gba/tonc_types.h>
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#ifdef CODE_COMPILED_AS_PART_OF_TEST
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#include <libgba-bitmap-engine/gba/tonc_math_stub.h>
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#else
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#include <libgba-bitmap-engine/gba/tonc_math.h>
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#endif
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#include <cmath>
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#include <string>
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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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extern FIXED TWO;
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#define SIN_LUT_MAX ((512 << 6) * 2) // 65536, FFFFh range
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#define FIX12_SHIFT 12
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#define FIX12_SCALE ( 1<<FIX12_SHIFT )
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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 FIXED fxsin(FIXED fxrad);
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INLINE FIXED fxcos(FIXED fxrad);
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INLINE float rnd(float val);
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INLINE std::string fstr(FIXED which);
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INLINE FIXED interpolate(FIXED min, FIXED max, FIXED gradient);
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// ---- impl
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INLINE FIXED interpolate(FIXED min, FIXED max, FIXED gradient) {
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return min + fxmul((max - min), CLAMP(gradient, 0, ONE));
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}
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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 std::string fstr(FIXED which) {
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char buffer[30];
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snprintf(buffer, 30, "%4.3f", rnd(fx2float(which)));
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std::string strObj4(buffer);
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return strObj4;
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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 SIN_LUT_MAX / (360 / (grad % 360));
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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 could be better without fx2float() ?
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int scale = fx2float(rad) / (2*M_PI / 512);
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return (scale << 6) * 2;
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}
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INLINE float fx12ToFloat(FIXED fx) {
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return fx / (float) FIX12_SCALE;
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}
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INLINE FIXED fx12div(FIXED fa, FIXED fb) {
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return ((fa)*FIX12_SCALE)/(fb);
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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 fxsin(FIXED fxrad) {
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if(fxrad == 0) return 0;
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FIXED theta = fxrad2lut(fxrad);
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FIXED sin = lu_sin(theta);
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return fx12Tofx8(sin);
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}
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INLINE FIXED fxcos(FIXED fxrad) {
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if(fxrad == 0) return ONE;
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FIXED theta = fxrad2lut(fxrad);
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FIXED cos = lu_cos(theta);
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return fx12Tofx8(cos);
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}
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INLINE FIXED fxtan(FIXED fxrad) {
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if(fxrad == 0) return 0;
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FIXED theta = fxrad2lut(fxrad);
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FIXED sin = lu_sin(theta);
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FIXED cos = lu_cos(theta);
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return fx12Tofx8(fx12div(sin, cos));
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}
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#endif //GBA_BITMAP_ENGINE_PROJECT_MATH_H
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