diff --git a/graphics/gr/donut/Makefile b/graphics/gr/donut/Makefile new file mode 100644 index 00000000..c2b22e1d --- /dev/null +++ b/graphics/gr/donut/Makefile @@ -0,0 +1,34 @@ +include ../../../Makefile.inc + +LINKER_DIR = ../../../linker_scripts/ + +EMPTY_DISK = ../../../empty_disk/empty.dsk +DOS33 = ../../../utils/dos33fs-utils/dos33 +TOKENIZE = ../../../utils/asoft_basic-utils/tokenize_asoft + +all: donut.dsk + +donut.dsk: HELLO DONUT + cp $(EMPTY_DISK) donut.dsk + $(DOS33) -y donut.dsk SAVE A HELLO + $(DOS33) -y donut.dsk BSAVE -a 0xc00 DONUT + +### + +HELLO: hello.bas + $(TOKENIZE) < hello.bas > HELLO + +#### + +DONUT: donut.o + ld65 -o DONUT donut.o -C $(LINKER_DIR)/apple2_c00.inc + +donut.o: donut.s + ca65 -o donut.o donut.s -l donut.lst + + +#### + +clean: + rm -f *~ *.o *.lst HELLO DONUT + diff --git a/graphics/gr/donut/donut.s b/graphics/gr/donut/donut.s new file mode 100644 index 00000000..79bf60c3 --- /dev/null +++ b/graphics/gr/donut/donut.s @@ -0,0 +1,1674 @@ +; donut +; based on donut code by @a1k0n + +; zero-page +GBASL = $26 +GBASH = $27 + +sB_l = $70 +sB_h = $71 +cB_l = $72 +cB_h = $73 +sA_l = $74 +sA_h = $75 +cA_l = $76 +cA_h = $77 +sAsB_l = $78 +sAsB_h = $79 +cAsB_l = $7A +cAsB_h = $7B +sAcB_l = $7C +sAcB_h = $7D +cAcB_l = $7E +cAcB_h = $7F + +r1i_l = $80 +r1i_h = $81 +r2i_l = $82 +r2i_h = $83 +p0x_l = $84 +p0x_h = $85 +p0y_l = $86 +p0y_h = $87 +p0z_l = $88 +p0z_h = $89 +yincC_l = $8A +yincC_h = $8B +yincS_l = $8C +yincS_h = $8D +xincX_l = $8E +xincX_h = $8F +xincY_l = $90 +xincY_h = $91 +xincZ_l = $92 +xincZ_h = $93 +ycA_l = $94 +ycA_h = $95 +ysA_l = $96 +ysA_h = $97 +xsAsB_l = $98 +xsAsB_h = $99 +xcAsB_l = $9A +xcAsB_h = $9B +vxi14_l = $9C +vxi14_h = $9D +vyi14_l = $9E +vyi14_h = $9F +vzi14_l = $A0 +vzi14_h = $A1 +t_l = $A2 +t_h = $A3 +px_l = $A4 +px_h = $A5 +py_l = $A6 +py_h = $A7 +pz_l = $A8 +pz_h = $A9 +lx0_l = $AA +lx0_h = $AB +ly0_l = $AC +ly0_h = $AD +lz0_l = $AE +lz0_h = $AF +t0_l = $B0 +t0_h = $B1 +t1_l = $B2 +t1_h = $B3 +t2_l = $B4 +t2_h = $B5 +d_l = $B6 +d_h = $B7 +lx_l = $B8 +lx_h = $B9 +ly_l = $BA +ly_h = $BB +lz_l = $BC +lz_h = $BD +n_l = $BE +n_h = $BF +dx_l = $C0 +dx_h = $C1 +dy_l = $C2 +dy_h = $C3 +dz_l = $C4 +dz_h = $C5 +a_l = $C6 +a_h = $C7 +b_l = $C8 +b_h = $C9 +c_l = $CA +c_h = $CB +arg1_l = $CC +arg1_h = $CD +arg2_l = $CE +arg2_h = $CF +arg3_l = $D0 +arg3_h = $D1 +arg4_l = $D2 +arg4_h = $D3 + +CTEMP1_L = $D4 +CTEMP1_H = $D5 +CTEMP2_L = $D6 +CTEMP2_H = $D7 +CTEMP3_L = $D8 +CTEMP3_H = $D9 +CTEMP4_L = $DA +CTEMP4_H = $DB + + + +TEMP1_L = $F0 +TEMP1_H = $F1 +TEMP2_L = $F2 +TEMP2_H = $F3 + +XX = $F4 +YY = $F5 +II = $F6 + +; soft-switches +FULLGR = $C052 + +; ROM routines +PLOT = $F800 ;; PLOT AT Y,A +SETGR = $FB40 + + +donut: + jsr SETGR + bit FULLGR + +init_vars: + ; high-precision rotation directions + ; sines and cosines and their products + + ; int16_t sB = 0, cB = 16384; + lda #0 + sta sB_l + sta sB_h + lda #<16384 + sta cB_l + lda #>16384 + sta cB_h + + ; int16_t sA = 11583, cA = 11583; + lda #<11583 + sta sA_l + sta cA_l + lda #>11583 + sta sA_h + sta cA_h + + ; int16_t sAsB = 0, cAsB = 0; + lda #<0 + sta sAsB_l + sta cAsB_l + lda #>0 + sta sAsB_h + sta cAsB_h + + ; int16_t sAcB = 11583, cAcB = 11583; + + lda #<11583 + sta sAcB_l + sta cAcB_l + lda #>11583 + sta sAcB_h + sta cAcB_h + + ; FIXME: propogate + ; const int16_t r1i = 256; + ; const int16_t r2i = 2*256; + lda #<256 + sta r1i_l + lda #>256 + sta r1i_h + + lda #<512 + sta r2i_l + lda #>512 + sta r2i_h + +main_loop: + ; int16_t p0x = (sB + (sB<<2)) >> 6; + + lda sB_l ; p0x = SB + sta p0x_l + lda sB_h + sta p0x_h + + asl p0x_l ; p0x = SB<<1 + rol p0x_h + asl p0x_l ; p0x = SB<<2 + rol p0x_h + + clc ; p0x = SB + (SB<<2) + lda p0x_l + adc sB_l + sta p0x_l + lda p0x_h + adc sB_h + sta p0x_h + + ldx #6 ; p0x = (SB + (SB<<2)) >> 6 +p1: + lda p0x_h +; cmp #$80 +; ror +; sta p0x_h + + lsr p0x_h + + ror p0x_l + dex + bne p1 + + ; int16_t p0y = (sAcB + (sAcB<<2)) >> 6; + + ; urgh math is done in 32-bit before casting down to 16 + + lda sAcB_l + sta p0y_l + lda sAcB_h + sta p0y_h + + asl p0y_l ; 2d3f*5 = e23b / 0x40 = 388 + rol p0y_h + asl p0y_l ; expect 0x388 + rol p0y_h + + clc + lda p0y_l + adc sAcB_l + sta p0y_l + lda p0y_h + adc sAcB_h + sta p0y_h + + ldx #6 +p2: +; lda p0y_h +; cmp #$80 +; ror +; sta p0y_h + + lsr p0y_h + ror p0y_l + dex + bne p2 + + ; int16_t p0z = (- (cAcB +(cAcB<<2))) >> 6; + + lda cAcB_l + sta p0z_l + lda cAcB_h + sta p0z_h + + asl p0z_l + rol p0z_h + asl p0z_l + rol p0z_h + + clc + lda p0z_l + adc cAcB_l + sta p0z_l + lda p0z_h + adc cAcB_h + sta p0z_h + + + ldx #6 +p3: +; lda p0z_h +; cmp #$80 +; ror +; sta p0z_h + + lsr p0z_h + ror p0z_l + dex + bne p3 + + ; negate + sec + lda #0 + sbc p0z_l + sta p0z_l + lda #0 + sbc p0z_h + sta p0z_h + + + ;======================================== + ; int16_t yincC = (cA >> 6) + (cA >> 5); + ; tested: OK + + lda cA_l ; TEMP1 = cA + sta TEMP1_L + lda cA_h + sta TEMP1_H + + ldx #5 ; TEMP1 = (cA>>5) +p4: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p4 + + lda TEMP1_L ; TEMP2 = (cA>>6) + sta TEMP2_L + lda TEMP1_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + + clc ; yincC = TEMP1+TEMP2 + lda TEMP2_L + adc TEMP1_L + sta yincC_l + lda TEMP2_H + adc TEMP1_H + sta yincC_h + + ;======================================== + ; int16_t yincS = (sA >> 6) + (sA >> 5); + ; tested: OK + + lda sA_l + sta TEMP1_L + lda sA_h + sta TEMP1_H + + ldx #5 +p5: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p5 + + + lda TEMP1_L + sta TEMP2_L + lda TEMP1_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + + clc + lda TEMP2_L + adc TEMP1_L + sta yincS_l + lda TEMP2_H + adc TEMP1_H + sta yincS_h + + ;========================================= + ; int16_t xincX = (cB >> 7) + (cB >> 6); + ; CB = $72 xincX= 8E + ; Tested: OK + + lda cB_l ; TEMP1 = CB + sta TEMP1_L + lda cB_h + sta TEMP1_H + + ldx #6 ; TEMP1 = CB>>6 +p6: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p6 + + lda TEMP1_L ; TEMP2 = CB>>7 + sta TEMP2_L + lda TEMP1_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + + clc ; xincx = TEMP1+TEMP2 + lda TEMP2_L + adc TEMP1_L + sta xincX_l + lda TEMP2_H + adc TEMP1_H + sta xincX_h + + ;=========================================== + ; int16_t xincY = (sAsB >> 7) + (sAsB >> 6); + + lda sAsB_l + sta TEMP1_L + lda sAsB_h + sta TEMP1_H + + ldx #6 +p7: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p7 + + + lda TEMP1_L + sta TEMP2_L + lda TEMP1_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + + clc + lda TEMP2_L + adc TEMP1_L + sta xincY_l + lda TEMP2_H + adc TEMP1_H + sta xincY_h + + ;=========================================== + ; int16_t xincZ = (cAsB >> 7) + (cAsB >> 6); + + lda cAsB_l + sta TEMP1_L + lda cAsB_h + sta TEMP1_H + + ldx #6 +p8: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p8 + + + lda TEMP1_L + sta TEMP2_L + lda TEMP1_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + + clc + lda TEMP2_L + adc TEMP1_L + sta xincZ_l + lda TEMP2_H + adc TEMP1_H + sta xincZ_h + + ;======================================== + ; int16_t ycA = -((cA >> 1) + (cA >> 4)); + ; ycA = $94 + ; tested: OK + + lda cA_l ; TEMP1 = CA + sta TEMP1_L + lda cA_h + sta TEMP1_H + + cmp #$80 ; TEMP1 = CA>>1 + ror + sta TEMP1_H + ror TEMP1_L + + lda TEMP1_L ; TEMP2 = CA>>1 + sta TEMP2_L + lda TEMP1_H + sta TEMP2_H + + ldx #3 ; TEMP2 = CA>>4 +p9: + lda TEMP2_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + dex + bne p9 + + ; add + clc ; yCA = TEMP1+TEMP2 + lda TEMP2_L + adc TEMP1_L + sta ycA_l + lda TEMP2_H + adc TEMP1_H + sta ycA_h + + ; negate + sec ; yCA = -(TEMP1+TEMP2) + lda #0 + sbc ycA_l + sta ycA_l + lda #0 + sbc ycA_h + sta ycA_h + + + ;======================================== + ; int16_t ysA = -((sA >> 1) + (sA >> 4)); + + lda sA_l + sta TEMP1_L + lda sA_h + sta TEMP1_H + + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + + lda TEMP1_L + sta TEMP2_L + lda TEMP1_H + sta TEMP2_H + + ldx #3 +p10: + lda TEMP2_H + cmp #$80 + ror + sta TEMP2_H + ror TEMP2_L + dex + bne p10 + + ; add + clc + lda TEMP2_L + adc TEMP1_L + sta ysA_l + lda TEMP2_H + adc TEMP1_H + sta ysA_h + + ; negate + sec + lda #0 + sbc ysA_l + sta ysA_l + lda #0 + sbc ysA_h + sta ysA_h + + ;================================= + ; for (int j = 0; j < 23; j++) { + ldx #0 + stx YY +yloop: + ldx YY + lda gr_offsets_l,X + sta GBASL + lda gr_offsets_h,X + sta GBASH ; TODO: add in page + + ;====================================== + ; int16_t xsAsB = (sAsB >> 4) - sAsB; ; -40*xincY + ; tested: OK + + lda sAsB_l ; xsAsB = sAsB + sta xsAsB_l + lda sAsB_h + sta xsAsB_h + + ldx #4 +p99: ; xsAsB = sAsB>>4 + lda xsAsB_h + cmp #$80 + ror + sta xsAsB_h + ror xsAsB_l + dex + bne p99 + + sec ; xsAsB = (sAsB>>4)-sAsB + lda xsAsB_l + sbc sAsB_l + sta xsAsB_l + lda xsAsB_h + sbc sAsB_h + sta xsAsB_h + + + ; int16_t xcAsB = (cAsB >> 4) - cAsB; ; -40*xincZ; + + lda cAsB_l + sta xcAsB_l + lda cAsB_h + sta xcAsB_h + + ldx #4 +p98: + lda xcAsB_h + cmp #$80 + ror + sta xcAsB_h + ror xcAsB_l + dex + bne p98 + + sec + lda xcAsB_l + sbc cAsB_l + sta xcAsB_l + lda xcAsB_h + sbc cAsB_h + sta xcAsB_h + + ;============================== + ; int16_t vxi14 = (cB >> 4) - cB - sB; ; -40*xincX - sB; + ; cxi14 = $9C + ; tested OK + + lda cB_l ; vxi14 = cB + sta vxi14_l + lda cB_h + sta vxi14_h + + ldx #4 ; vxi14 = (cB>>4) +p97: + lda vxi14_h + cmp #$80 + ror + sta vxi14_h + ror vxi14_l + dex + bne p97 + + sec ; vxi14 = (cb>>4) - CB + lda vxi14_l + sbc cB_l + sta vxi14_l + lda vxi14_h + sbc cB_h + sta vxi14_h + + sec ; cxi14 = (cb>>4) - CB - SB + lda vxi14_l + sbc sB_l + sta vxi14_l + lda vxi14_h + sbc sB_h + sta vxi14_h + + ; int16_t vyi14 = ycA - xsAsB - sAcB; + sec + lda ycA_l ; vyi14 = yCA - xsAsB + sbc xsAsB_l + sta vyi14_l + lda ycA_h + sbc xsAsB_h + sta vyi14_h + + sec ; vyi14 = yCA - xsAsB - sAcB + lda vyi14_l + sbc sAcB_l + sta vyi14_l + lda vyi14_h + sbc sAcB_h + sta vyi14_h + + ; int16_t vzi14 = ysA + xcAsB + cAcB; + + clc ; vzi14 = ysA + xcAsB + lda ysA_l + adc xcAsB_l + sta vzi14_l + lda ysA_h + adc xcAsB_h + sta vzi14_h + + clc ; vzi14 = ysA + xcAsB + cAcB + lda vzi14_l + adc cAcB_l + sta vzi14_l + lda vzi14_h + adc cAcB_h + sta vzi14_h + + + ; for (int i = 0; i < 79; i++) { + ldy #0 + sty XX +xloop: + + ; int16_t t = 512; + lda #$2 + sta t_h + lda #0 + sta t_l + + ; int16_t px = p0x + (vxi14 >> 5); + + lda vxi14_l ; px = (vxi14) + sta px_l + lda vxi14_h + sta px_h + + ldx #5 ; px = (vxi14>>5) +p96: + lda px_h + cmp #$80 + ror + sta px_h + ror px_l + dex + bne p96 + + clc ; px = p0x + (vxi14>>5) + lda px_l + adc p0x_l + sta px_l + lda px_h + adc p0x_h + sta px_h + + ; int16_t py = p0y + (vyi14 >> 5); + + lda vyi14_l + sta py_l + lda vyi14_h + sta py_h + + ldx #5 +p95: + lda py_h + cmp #$80 + ror + sta py_h + ror py_l + dex + bne p95 + + clc + lda py_l + adc p0y_l + sta py_l + lda py_h + adc p0y_h + sta py_h + + ; int16_t pz = p0z + (vzi14 >> 5); + + lda vzi14_l + sta pz_l + lda vzi14_h + sta pz_h + + ldx #5 +p94: + lda pz_h + cmp #$80 + ror + sta pz_h + ror pz_l + dex + bne p94 + + clc + lda pz_l + adc p0z_l + sta pz_l + lda pz_h + adc p0z_h + sta pz_h + + ; int16_t lx0 = sB >> 2; + + lda sB_l + sta lx0_l + lda sB_h + sta lx0_h + + ldx #2 +p93: + lda lx0_h + cmp #$80 + ror + sta lx0_h + ror lx0_l + dex + bne p93 + + ; int16_t ly0 = (sAcB - cA) >> 2; + + sec + lda sAcB_l + sbc cA_l + sta ly0_l + lda sAcB_h + sbc cA_h + sta ly0_h + + ldx #2 +p92: + lda ly0_h + cmp #$80 + ror + sta ly0_h + ror ly0_l + dex + bne p92 + + + ; int16_t lz0 = (-cAcB - sA) >> 2; + + ; negate + sec ; lz0 = -cAcB + lda #0 + sbc cAcB_l + sta lz0_l + lda #0 + sbc cAcB_h + sta lz0_h + + sec ; lz0 = (-cAcB - sA) + lda lz0_l + sbc sA_l + sta lz0_l + lda lz0_h + sbc sA_h + sta lz0_h + + ldx #2 +p91: + lda lz0_h + cmp #$80 + ror + sta lz0_h + ror lz0_l + dex + bne p91 + + +color_loop: + ;========================================= + ; int16_t lx = lx0, ly = ly0, lz = lz0; + ; AA, AC ,AE + ; Tested OK! + + lda lx0_l + sta lx_l + lda lx0_h + sta lx_h + + lda ly0_l + sta ly_l + lda ly0_h + sta ly_h + + lda lz0_l + sta lz_l + lda lz0_h + sta lz_h + + ;===================================== + ; t0 = length_cordic(px, py, &lx, ly); + ; px=A4, py=A6 + ; TEST OK! + + lda px_l + sta arg1_l + lda px_h + sta arg1_h + + lda py_l + sta arg2_l + lda py_h + sta arg2_h + + lda lx_l + sta arg3_l + lda lx_h + sta arg3_h + + lda ly_l + sta arg4_l + lda ly_h + sta arg4_h + + jsr length_cordic + + ;=========================== + ; T0 = $B0 + ; check OK! + + lda arg1_l + sta t0_l + lda arg1_h + sta t0_h + + lda arg3_l + sta lx_l + lda arg3_h + sta lx_h + + + ;=============== + ; t1 = t0 - r2i; + ; t1=$B2 + ; TESTED OK + + sec + lda t0_l + sbc r2i_l + sta t1_l + lda t0_h + sbc r2i_h + sta t1_h + + + ;===================================== + ; t2 = length_cordic(pz, t1, &lz, lx); + ; PZ=$A8 LZ=$BC + ; TESTED: PZ is off by 1 + + lda pz_l + sta arg1_l + lda pz_h + sta arg1_h + + lda t1_l + sta arg2_l + lda t1_h + sta arg2_h + + lda lz_l + sta arg3_l + lda lz_h + sta arg3_h + + lda lx_l + sta arg4_l + lda lx_h + sta arg4_h + + jsr length_cordic + + ;======================== + ; after + ; check arg1=$CC arg3=$D0 + ; T2=B4 LZ=BC + ; TEST OK + + lda arg1_l + sta t2_l + lda arg1_h + sta t2_h + + lda arg3_l + sta lz_l + lda arg3_h + sta lz_h + + ;============== + ; d = t2 - r1i; + ; TEST: ok + sec + lda t2_l + sbc r1i_l + sta d_l + lda t2_h + sbc r1i_h + sta d_h + + + ;======== + ; t += d; + + clc + lda t_l + adc d_l + sta t_l + lda t_h + adc d_h + sta t_h + + ; check if too far + + ; T in $A2, D in $B6 + ; CORRECT + +check_t: + lda t_h ; if (t > 8*256) + cmp #8 + bcc check_d + + lda #0 ; black + beq do_plot_color ; bra + +check_d: + lda d_l ; if (d<2) + cmp #2 ; 16-bit signed compare + lda d_h + sbc #0 + bvc label + eor #$80 +label: + ; if N=1 then less + + bpl skip_plot ; bge + + ;int N = lz >> 9; + lda lz_h + cmp #$80 + ror + + tax + bmi n_negative + cpx #12 + bcc do_plot ; blt + ; if (N>11) N=11; + ldx #11 + bne do_plot ; bra + +n_negative: + ; if (N<0) N=0; + ldx #0 + +; beq do_plot ; bra + + ; fall through +do_plot: + lda colors,X +do_plot_color: + ; T=A2 + pha + lda XX + lsr + tay + pla + sta (GBASL),Y + + jmp done_color + +skip_plot: + + ; 11x1.14 fixed point 3x parallel multiply + ; only 16 bit registers needed; starts from highest bit to lowest + ; d is about 2..1100, so 11 bits are sufficient + + ; int16_t dx = 0, dy = 0, dz = 0; + lda #0 + sta dx_l + sta dx_h + sta dy_l + sta dy_h + sta dz_l + sta dz_h + + ; int16_t a = vxi14, b = vyi14, c = vzi14; + lda vxi14_l + sta a_l + lda vxi14_h + sta a_h + + lda vyi14_l + sta b_l + lda vyi14_h + sta b_h + + lda vzi14_l + sta c_l + lda vzi14_h + sta c_h + + ; check a,b,c = c6, c8, cA + ; TEST: OK + +mul_loop: + lda d_h ; while(d) + bne cont_mul_loop + lda d_l + beq done_mul_loop +cont_mul_loop: + lda d_h + and #(4) ; if (d&1024) { + beq not_1023 + + ; dx += a; + clc + lda dx_l + adc a_l + sta dx_l + lda dx_h + adc a_h + sta dx_h + + ; dy += b; + clc + lda dy_l + adc b_l + sta dy_l + lda dy_h + adc b_h + sta dy_h + + ; dz += c; + clc + lda dz_l + adc c_l + sta dz_l + lda dz_h + adc c_h + sta dz_h + +not_1023: + ; d = (d&1023) << 1; + lda d_h + and #$3 + sta d_h + + asl d_l ; d<<=1 + rol d_h + + ; a >>= 1; + + lda a_h + cmp #$80 + ror + sta a_h + ror a_l + + ; b >>= 1; + + lda b_h + cmp #$80 + ror + sta b_h + ror b_l + + ; c >>= 1; + + lda c_h + cmp #$80 + ror + sta c_h + ror c_l + + jmp mul_loop +done_mul_loop: + + ; we already shifted down 10 bits, so get the last four + ; DX=C0 / C2 / C4 + ; px=A4 / a6 / a8 + ; TEST: GOOD + + ; px += dx >> 4; + + lda dx_l + sta TEMP1_L + lda dx_h + sta TEMP1_H + + ldx #4 +p90: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p90 + + clc + lda px_l + adc TEMP1_L + sta px_l + lda px_h + adc TEMP1_H + sta px_h + + ;=================== + ; py += dy >> 4; + + lda dy_l + sta TEMP1_L + lda dy_h + sta TEMP1_H + + ldx #4 +p89: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p89 + + clc + lda py_l + adc TEMP1_L + sta py_l + lda py_h + adc TEMP1_H + sta py_h + + ; pz += dz >> 4; + + lda dz_l + sta TEMP1_L + lda dz_h + sta TEMP1_H + + ldx #4 +p88: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne p88 + + clc + lda pz_l + adc TEMP1_L + sta pz_l + lda pz_h + adc TEMP1_H + sta pz_h + + ; AFTER + ; px=ok, py=unchanged? + + jmp color_loop +done_color: + + ; vxi14 += xincX; + clc + lda vxi14_l + adc xincX_l + sta vxi14_l + lda vxi14_h + adc xincX_h + sta vxi14_h + + ; vyi14 -= xincY; + sec + lda vyi14_l + sbc xincY_l + sta vyi14_l + lda vyi14_h + sbc xincY_h + sta vyi14_h + + ; vzi14 += xincZ; + clc + lda vzi14_l + adc xincZ_l + sta vzi14_l + lda vzi14_h + adc xincZ_h + sta vzi14_h + + + inc XX + ldy XX + cpy #80 + beq done_xloop + jmp xloop + +done_xloop: + + ;============== + ; ycA += yincC; + + clc + lda ycA_l + adc yincC_l + sta ycA_l + lda ycA_h + adc yincC_h + sta ycA_h + + ;=============== + ; ysA += yincS; + + clc + lda ysA_l + adc yincS_l + sta ysA_l + lda ysA_h + adc yincS_h + sta ysA_h + + inc YY + lda YY + cmp #24 + beq done_yloop + + jmp yloop + +done_yloop: + +rotate: +.if 0 + ; rotate sines, cosines, and products thereof + ; this animates the torus rotation about two axes + + cA-=(sA>>5); + sA+=(cA>>5); + + cAsB-=(sAsB>>5); + sAsB+=(cAsB>>5); + + cAcB-=(sAcB>>5); + sAcB+=(cAcB>>5); + + cB-=(sB>>6); + sB+=(cB>>6); + + cAcB-=(cAsB>>6); + cAsB+=(cAcB>>6); + + sAcB-=(sAsB>>6); + sAsB+=(sAcB>>6); + + ; flip pages? + + ; usleep(15000); + +.endif + + jmp main_loop + + +; CORDIC algorithm to find magnitude of |x,y| by rotating the x,y vector onto +; the x axis. This also brings vector (x2,y2) along for the ride, and writes +; back to x2 -- this is used to rotate the lighting vector from the normal of +; the torus surface towards the camera, and thus determine the lighting amount. +; We only need to keep one of the two lighting normal coordinates. + +; ARG1=x,ARG2=y,ARG3=x2,ARG4=y2 + +; int length_cordic(int16_t x, int16_t y, int16_t *x2_, int16_t y2) { + +length_cordic: + + lda arg1_h ; if (arg1 < 0) { ; start in right half-plane + bpl no_adjust + + ; arg1 = -arg1; + ; negate + sec + lda #0 + sbc arg1_l + sta arg1_l + lda #0 + sbc arg1_h + sta arg1_h + + ; arg3 = -arg3; + ; negate + sec + lda #0 + sbc arg3_l + sta arg3_l + lda #0 + sbc arg3_h + sta arg3_h + +no_adjust: + ; check here + ; arg1=CC, CE, D0, D2 + ; TEST OK + + ; for (int i = 0; i < 8; i++) { + lda #0 + sta II +cordic_loop: + ; int16_t temp1 = arg1; + lda arg1_l + sta TEMP1_L + lda arg1_h + sta TEMP1_H + + ; int16_t temp2 = arg3; + lda arg3_l + sta TEMP2_L + lda arg3_h + sta TEMP2_H + + ; CTEMP1 = arg2>>i + + lda arg2_l + sta CTEMP1_L + lda arg2_h + sta CTEMP1_H + ldx II + beq done_pc1 +pc1: + lda CTEMP1_H + cmp #$80 + ror + sta CTEMP1_H + ror CTEMP1_L + dex + bne pc1 +done_pc1: + + ; CTEMP2 = temp1>>i + + lda TEMP1_L + sta CTEMP2_L + lda TEMP1_H + sta CTEMP2_H + ldx II + beq done_pc2 +pc2: + lda CTEMP2_H + cmp #$80 + ror + sta CTEMP2_H + ror CTEMP2_L + dex + bne pc2 +done_pc2: + + ; CTEMP3 = arg4>>i + + lda arg4_l + sta CTEMP3_L + lda arg4_h + sta CTEMP3_H + ldx II + beq done_pc3 +pc3: + lda CTEMP3_H + cmp #$80 + ror + sta CTEMP3_H + ror CTEMP3_L + dex + bne pc3 +done_pc3: + + ; CTEMP4 = temp2>>i + lda TEMP2_L + sta CTEMP4_L + lda TEMP2_H + sta CTEMP4_H + ldx II + beq done_pc4 +pc4: + lda CTEMP4_H + cmp #$80 + ror + sta CTEMP4_H + ror CTEMP4_L + dex + bne pc4 +done_pc4: + + ;========================= + + lda arg2_h ; if (arg2 < 0) { + bpl cordic_pos +cordic_neg: + + ; arg1 -= CTEMP1 + sec + lda arg1_l + sbc CTEMP1_L + sta arg1_l + lda arg1_h + sbc CTEMP1_H + sta arg1_h + + ; arg2 += CTEMP2 + clc + lda arg2_l + adc CTEMP2_L + sta arg2_l + lda arg2_h + adc CTEMP2_H + sta arg2_h + + ; arg3 -= CTEMP3 + sec + lda arg3_l + sbc CTEMP3_L + sta arg3_l + lda arg3_h + sbc CTEMP3_H + sta arg3_h + + ; arg4 += CTEMP4 + clc + lda arg4_l + adc CTEMP4_L + sta arg4_l + lda arg4_h + adc CTEMP4_H + sta arg4_h + + jmp cordic_if_done +cordic_pos: + + ; arg1 += CTEMP1 + clc + lda arg1_l + adc CTEMP1_L + sta arg1_l + lda arg1_h + adc CTEMP1_H + sta arg1_h + + ; arg2 -= CTEMP2 + sec + lda arg2_l + sbc CTEMP2_L + sta arg2_l + lda arg2_h + sbc CTEMP2_H + sta arg2_h + + ; arg3 += CTEMP3 + clc + lda arg3_l + adc CTEMP3_L + sta arg3_l + lda arg3_h + adc CTEMP3_H + sta arg3_h + + ; arg4 -= CTEMP4 + sec + lda arg4_l + sbc CTEMP4_L + sta arg4_l + lda arg4_h + sbc CTEMP4_H + sta arg4_h + +cordic_if_done: + + inc II + lda II + cmp #8 + beq cordic_loop_done + jmp cordic_loop + +cordic_loop_done: + + + ; divide by 0.625 as a c]heap approximation + ; to the 0.607 scaling factor factor + ; introduced by this algorithm + ; (see https://en.wikipedia.org/wiki/CORDIC) + + ; *arg3_ = (arg3 >> 1) + (arg3 >> 3); + + lda arg3_l ; TEMP1 = arg3 + sta TEMP1_L + lda arg3_h + sta TEMP1_H + + lda TEMP1_H ; TEMP1 = arg3>>1 + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + + lda TEMP1_L ; arg3 = arg3>>1 + sta arg3_l + lda TEMP1_H + sta arg3_h + + ldx #2 ; TEMP1 = arg3>>3 +cp5: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne cp5 + + clc + lda arg3_l + adc TEMP1_L + sta arg3_l + lda arg3_h + adc TEMP1_H + sta arg3_h + + ; return (arg1 >> 1) + (arg1 >> 3); + + lda arg1_l ; TEMP1 = arg1 + sta TEMP1_L + lda arg1_h + sta TEMP1_H + + lda TEMP1_H ; TEMP1 = arg1>>1 + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + + lda TEMP1_L ; arg1 = arg1>>1 + sta arg1_l + lda TEMP1_H + sta arg1_h + + ldx #2 ; TEMP1 = arg1>>3 +cp6: + lda TEMP1_H + cmp #$80 + ror + sta TEMP1_H + ror TEMP1_L + dex + bne cp6 + + clc + lda arg1_l + adc TEMP1_L + sta arg1_l + lda arg1_h + adc TEMP1_H + sta arg1_h + + rts + + + ; 0 2 2 6 6 5 5 7 7 15 15 15 + ; 2 2 6 6 5 5 7 7 15 15 15 15 +colors: + .byte $20,$22,$62,$66,$56,$55,$55,$75,$77,$F7,$FF,$FF + + +gr_offsets_h: + .byte >$400,>$480,>$500,>$580,>$600,>$680,>$700,>$780 + .byte >$428,>$4a8,>$528,>$5a8,>$628,>$6a8,>$728,>$7a8 + .byte >$450,>$4d0,>$550,>$5d0,>$650,>$6d0,>$750,>$7d0 + + +gr_offsets_l: + .byte <$400,<$480,<$500,<$580,<$600,<$680,<$700,<$780 + .byte <$428,<$4a8,<$528,<$5a8,<$628,<$6a8,<$728,<$7a8 + .byte <$450,<$4d0,<$550,<$5d0,<$650,<$6d0,<$750,<$7d0 diff --git a/graphics/gr/donut/hello.bas b/graphics/gr/donut/hello.bas new file mode 100644 index 00000000..0e3aae36 --- /dev/null +++ b/graphics/gr/donut/hello.bas @@ -0,0 +1,2 @@ +5 HOME +40 PRINT CHR$(4)"CATALOG" diff --git a/utils/gr-sim/donut/donut.c b/utils/gr-sim/donut/donut.c index 8bd8790c..8102cb03 100644 --- a/utils/gr-sim/donut/donut.c +++ b/utils/gr-sim/donut/donut.c @@ -4,6 +4,7 @@ #include #include #include +#include #include "gr-sim.h" #include "tfv_utils.h" @@ -18,10 +19,15 @@ int length_cordic(int16_t x, int16_t y, int16_t *x2_, int16_t y2) { int16_t x2 = *x2_; +//printf("before: x=0x%hx y=0x%hx x2=0x%hx y2=0x%hx\n",x,y,x2,y2); + if (x < 0) { // start in right half-plane x = -x; x2 = -x2; } + +//printf("after: x=0x%hx y=0x%hx x2=0x%hx y2=0x%hx\n",x,y,x2,y2); + for (int i = 0; i < 8; i++) { int16_t t = x; int16_t t2 = x2; @@ -36,6 +42,7 @@ int length_cordic(int16_t x, int16_t y, int16_t *x2_, int16_t y2) { x2 += y2 >> i; y2 -= t2 >> i; } + //printf("(%d) x=0x%hx y=0x%hx x2=0x%hx y2=0x%hx\n",i,x,y,x2,y2); } // divide by 0.625 as a cheap approximation to the 0.607 scaling factor factor // introduced by this algorithm (see https://en.wikipedia.org/wiki/CORDIC) @@ -43,7 +50,6 @@ int length_cordic(int16_t x, int16_t y, int16_t *x2_, int16_t y2) { return (x >> 1) + (x >> 3); } - int main(int argc, char **argv) { int ch; @@ -58,17 +64,20 @@ int main(int argc, char **argv) { int16_t sAsB = 0, cAsB = 0; int16_t sAcB = 11583, cAcB = 11583; + const int16_t r1i = 256; + const int16_t r2i = 2*256; + while(1) { // yes this is a multiply but dz is 5 // so it's (sb + (sb<<2)) >> 6 effectively - int p0x = (5 * sB) >> 6; - int p0y = (5 * sAcB) >> 6; - int p0z = (-5 * cAcB) >> 6; + /* urgh math is done in 32-bit before casting to 16? */ + int16_t p0x = (sB + (sB<<2)) >> 6; + int16_t p0y = (sAcB + (sAcB<<2)) >> 6; + int16_t p0z = (- (cAcB +(cAcB<<2))) >> 6; + - const int16_t r1i = 256; - const int16_t r2i = 2*256; int16_t yincC = (cA >> 6) + (cA >> 5); // 12*cA >> 8; int16_t yincS = (sA >> 6) + (sA >> 5); // 12*sA >> 8; @@ -79,8 +88,7 @@ int main(int argc, char **argv) { int16_t ysA = -((sA >> 1) + (sA >> 4)); // -12 * yinc2 = -9*sA >> 4; for (int j = 0; j < 23; j++) { - ycA += yincC; - ysA += yincS; + int16_t xsAsB = (sAsB >> 4) - sAsB; // -40*xincY int16_t xcAsB = (cAsB >> 4) - cAsB; // -40*xincZ; @@ -89,9 +97,7 @@ int main(int argc, char **argv) { int16_t vzi14 = ysA + xcAsB + cAcB; for (int i = 0; i < 79; i++) { - vxi14 += xincX; - vyi14 -= xincY; - vzi14 += xincZ; + int16_t t = 512; int16_t px = p0x + (vxi14 >> 5); @@ -105,19 +111,51 @@ int main(int argc, char **argv) { int16_t t0, t1, t2, d; int16_t lx = lx0, ly = ly0, lz = lz0; + //printf("lx0=0x%hx ly0=0x%hx lz0=0x%hx\n",lx0,ly0,lz0); + //printf("px=0x%hx py=0x%hx lx=0x%hx ly=0x%hx\n",px,py,lx,ly); + + t0 = length_cordic(px, py, &lx, ly); - t1 = t0 - r2i; - t2 = length_cordic(pz, t1, &lz, lx); + //printf("after cord t0=0x%hx lx=0x%hx\n",t0,lx); + + t1 = t0 - r2i; + + //printf("t1=0x%hx\n",t1); + + + //printf("pz=0x%hx t1=0x%hx lz=0x%hx lx=0x%hx\n",pz,t1,lz,lx); + t2 = length_cordic(pz, t1, &lz, lx); + + //printf("after: t2=0x%hx lz=0x%hx\n",t2,lz); + d = t2 - r1i; + + //printf("d=0x%hx\n",d); + t += d; + //printf("t=0x%hx\n",t); // 0 2 2 6 6 5 5 7 7 15 15 15 // 2 2 6 6 5 5 7 7 15 15 15 15 int color_hi[12]={0, 2, 2, 6, 6, 5, 5, 5, 7, 7, 15, 15 }; int color_lo[12]={2, 2, 6, 6, 5, 5, 5, 7, 7, 15, 15, 15 }; + //printf("r1i=0x%hx r2i=0x%hx\n",r1i,r2i); + //printf("sB=0x%hx sAcB=0x%hx cAcB=0x%x\n",sB,sAcB,cAcB); + //printf("p0x=0x%hx p0y=0x%hx p0z=0x%x\n",p0x,p0y,p0z); + //printf("cA=0x%hx yincC=0x%hx\n",cA,yincC); + //printf("sA=0x%hx yincS=0x%hx\n",sA,yincS); + //printf("cB=0x%hx xincX=0x%hx\n",cB,xincX); + //printf("ycA=0x%hx\n",ycA); + //printf("xsAsB=0x%hx sAsB=0x%hx\n",xsAsB,sAsB); + //printf("vxi14=0x%hx\n",vxi14); + //printf("lx0=0x%hx ly0=0x%hx lz0=0x%hx\n",lx0,ly0,lz0); + //printf("t=0x%hx d=0x%hx\n",t,d); + + if (t > 8*256) { +// printf("%d: t=0x%hx d=0x%hx 0\n",i,t,d); color_equals(0); plot(i/2,j*2); plot(i/2,(j*2)+1); @@ -127,28 +165,26 @@ int main(int argc, char **argv) { if (N<0) N=0; if (N>11) N=11; +// printf("%d,%d: N=%d t=0x%hx d=0x%hx\n",i,j,N,t,d); +// exit(1); + color_equals(color_hi[N]); plot(i/2,j*2); color_equals(color_lo[N]); plot(i/2,(j*2)+1); break; } - // todo: shift and add version of this - /* - if (d < dmin) dmin = d; - if (d > dmax) dmax = d; - px += d*vxi14 >> 14; - py += d*vyi14 >> 14; - pz += d*vzi14 >> 14; - */ - { + // 11x1.14 fixed point 3x parallel multiply // only 16 bit registers needed; starts from highest bit to lowest // d is about 2..1100, so 11 bits are sufficient int16_t dx = 0, dy = 0, dz = 0; int16_t a = vxi14, b = vyi14, c = vzi14; + + //printf("a=0x%hx b=0x%hx c=0x%hx\n",a,b,c); while (d) { + if (d&1024) { dx += a; dy += b; @@ -158,14 +194,29 @@ int main(int argc, char **argv) { a >>= 1; b >>= 1; c >>= 1; + //printf("after mask: a=0x%hx b=0x%hx c=0x%hx\n",a,b,c); } // we already shifted down 10 bits, so get the last four + //printf("before: px=0x%hx py=0x%hx pz=0x%hx\n",px,py,pz); + //printf(" dx=0x%hx dy=0x%hx dz=0x%hx\n",dx,dy,dz); + px += dx >> 4; py += dy >> 4; pz += dz >> 4; - } + //printf("after : px=0x%hx py=0x%hx pz=0x%hx\n",px,py,pz); + //printf(" dx=0x%hx dy=0x%hx dz=0x%hx\n",dx,dy,dz); + } +// i end + vxi14 += xincX; + vyi14 -= xincY; + vzi14 += xincZ; } +// j end + ycA += yincC; + ysA += yincS; + + } // rotate sines, cosines, and products thereof