prog8/compiler/res/prog8lib/floats_functions.p8

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floats {
; the floating point functions shared across compiler targets
%option merge
sub print_f(float value) {
; ---- prints the floating point value (without a newline).
%asm {{
stx floats_store_reg
lda #<value
ldy #>value
jsr MOVFM ; load float into fac1
jsr FOUT ; fac1 to string in A/Y
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
- lda (P8ZP_SCRATCH_W1),y
beq +
jsr cbm.CHROUT
iny
bne -
+ ldx floats_store_reg
rts
}}
}
sub pow(float value, float power) -> float {
%asm {{
stx P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
lda #<value
ldy #>value
jsr floats.CONUPK
lda #<power
ldy #>power
jsr floats.FPWR
ldx P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
rts
}}
}
sub sin(float angle) -> float {
%asm {{
lda #<angle
ldy #>angle
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr SIN
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub cos(float angle) -> float {
%asm {{
lda #<angle
ldy #>angle
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr COS
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub tan(float value) -> float {
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr TAN
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub atan(float value) -> float {
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr ATN
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub ln(float value) -> float {
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr LOG
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub log2(float value) -> float {
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr LOG
jsr MOVEF
lda #<FL_LOG2_const
ldy #>FL_LOG2_const
jsr MOVFM
jsr FDIVT
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub rad(float angle) -> float {
; -- convert degrees to radians (d * pi / 180)
%asm {{
lda #<angle
ldy #>angle
jsr MOVFM
stx P8ZP_SCRATCH_REG
lda #<_pi_div_180
ldy #>_pi_div_180
jsr FMULT
ldx P8ZP_SCRATCH_REG
rts
_pi_div_180 .byte 123, 14, 250, 53, 18 ; pi / 180
}}
}
sub deg(float angle) -> float {
; -- convert radians to degrees (d * (1/ pi * 180))
%asm {{
lda #<angle
ldy #>angle
jsr MOVFM
stx P8ZP_SCRATCH_REG
lda #<_one_over_pi_div_180
ldy #>_one_over_pi_div_180
jsr FMULT
ldx P8ZP_SCRATCH_REG
rts
_one_over_pi_div_180 .byte 134, 101, 46, 224, 211 ; 1 / (pi * 180)
}}
}
sub round(float value) -> float {
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr FADDH
jsr INT
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub floor(float value) -> float {
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
jsr INT
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub ceil(float value) -> float {
; -- ceil: tr = int(f); if tr==f -> return else return tr+1
%asm {{
lda #<value
ldy #>value
jsr MOVFM
stx P8ZP_SCRATCH_REG
ldx #<fmath_float1
ldy #>fmath_float1
jsr MOVMF
jsr INT
lda #<fmath_float1
ldy #>fmath_float1
jsr FCOMP
cmp #0
beq +
lda #<FL_ONE_const
ldy #>FL_ONE_const
jsr FADD
+ ldx P8ZP_SCRATCH_REG
rts
}}
}
sub rndseedf(float seed) {
if seed>0
seed = -seed ; make sure fp seed is always negative
%asm {{
stx floats_store_reg
lda #<seed
ldy #>seed
jsr MOVFM ; load float into fac1
lda #-1
jsr floats.RND
ldx floats_store_reg
rts
}}
}
sub minf(float f1, float f2) -> float {
if f1<f2
return f1
return f2
}
sub maxf(float f1, float f2) -> float {
if f1>f2
return f1
return f2
}
}