prog8/compiler/res/prog8lib/math.p8

; Internal Math library routines - always included by the compiler

math {
	%asminclude "library:math.asm"

    asmsub sin8u(ubyte angle @A) clobbers(Y) -> ubyte @A {
        %asm {{
		tay
		lda  _sinecos8u,y
		rts
_sinecos8u	.byte  trunc(128.0 + 127.5 * sin(range(256+64) * rad(360.0/256.0)))
        }}
    }

    asmsub cos8u(ubyte angle @A) clobbers(Y) -> ubyte @A {
        %asm {{
		tay
		lda  sin8u._sinecos8u+64,y
		rts
        }}
    }

    asmsub sin8(ubyte angle @A) clobbers(Y) -> byte @A {
        %asm {{
		tay
		lda  _sinecos8,y
		rts
_sinecos8	.char  trunc(127.0 * sin(range(256+64) * rad(360.0/256.0)))
        }}
    }

    asmsub cos8(ubyte angle @A) clobbers(Y) -> byte @A {
        %asm {{
		tay
		lda  sin8._sinecos8+64,y
		rts
        }}
    }

    asmsub sinr8u(ubyte radians @A) clobbers(Y) -> ubyte @A {
        %asm {{
		tay
		lda  _sinecosR8u,y
		rts
_sinecosR8u	.byte  trunc(128.0 + 127.5 * sin(range(180+45) * rad(360.0/180.0)))
        }}
    }

    asmsub cosr8u(ubyte radians @A) clobbers(Y) -> ubyte @A {
        %asm {{
		tay
		lda  sinr8u._sinecosR8u+45,y
		rts
        }}
    }

    asmsub sinr8(ubyte radians @A) clobbers(Y) -> byte @A {
        %asm {{
		tay
		lda  _sinecosR8,y
		rts
_sinecosR8	.char  trunc(127.0 * sin(range(180+45) * rad(360.0/180.0)))
        }}
    }

    asmsub cosr8(ubyte radians @A) clobbers(Y) -> byte @A {
        %asm {{
		tay
		lda  sinr8._sinecosR8+45,y
		rts
        }}
    }

    asmsub rnd() -> ubyte @A {
        %asm {{
            jmp  math.randbyte
        }}
    }

    asmsub rndw() -> uword @AY {
        %asm {{
            jmp  math.randword
        }}
    }

    asmsub rndseed(uword seed1 @AY, uword seed2 @R0) clobbers(A,Y) {
        ; -- set new pseudo RNG's seed values. Defaults are: $00c2, $1137
        %asm {{
            sta  math.randword.x1
            sty  math.randword.c1
            lda  cx16.r0L
            sta  math.randword.a1
            lda  cx16.r0H
            sta  math.randword.b1
            rts
        }}
    }
}