kit-8 std/math.h v0

#ifndef _STD_MATH_H
#define _STD_MATH_H
;std/math.h
;(include "math.asm" somewhere if you want to actually use this)

;available defines of MATH_USE_x:
;MATH_USE_ALL (auto-defines everything else)
;MATH_USE_ADD
;MATH_USE_SIN

#include "pseudoOps.h"

#ifdef MATH_USE_ALL
 #ifndef MATH_USE_ADD
  #define MATH_USE_ADD
 #endif
 #ifndef MATH_USE_SIN
  #define MATH_USE_SIN
 #endif
#endif

;used to actually call the math subroutines
#ifdef MATH_USE_ADD
#define add8s_16(_d,_val, _ptrA) \
    lda _d,(_val) && ldc_imm(_ptrA) &&\
    stc_abs(math_ptrA)              &&\
    l1call_abs_s(_add8s_16)
#define add16_16(_ptrA,_ptrB) \
    ldc_imm(_ptrA) && stc_abs(math_ptrA)    &&\
    ldc_imm(_ptrB)                          &&\
    stc_abs(math_ptrB)                      &&\
    l1call_abs_s(_add16_16)
#endif

#ifdef MATH_USE_SIN
;this computes sin by grabbing from sin_table
;(requires sin256_8.bin)
#define sin8_i_shift(_shft) \
    lda @,sin_table                     &&\
    shr(#,_shft) && sta $,_SCRATCH_C    &&\
    and #,0x80>>_shft && bnz @+2+3      &&\
    lda #,0 && jmp @+3+2                &&\
    lda #,_l(0xff00>>_shft)             &&\
    ora_abs(_SCRATCH_C)
#endif

#endif