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Changeset 4f508e6 in buchla-68k for vlib/vsplot4.s
- Timestamp:
- 07/01/2017 02:34:46 PM (7 years ago)
- Branches:
- master
- Children:
- 08e1da1
- Parents:
- f40a309
- File:
-
- 1 edited
-
vlib/vsplot4.s (modified) (1 diff)
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vlib/vsplot4.s
rf40a309 r4f508e6 1 *------------------------------------------------------------------------------2 *vsplot4.s -- output characters to a 4-bit / pixel graphics window3 *with variable vertical pitch, etc.4 *Version 1 -- 1988-10-07 -- D.N. Lynx Crowe5 *(c) Copyright 1988 -- D.N. Lynx Crowe6 *------------------------------------------------------------------------------7 * 8 *vsplot4(obase, nw, fg, row, col, str, pitch, ht, cgtab)9 * uint *obase, nw, fg, row, col, pitch, ht, cgtab[][256];10 * char *str;11 * 12 *Outputs characters from the string at 'str' to an 'nw'13 *character wide 4-bit per pixel graphics window at 'obase'14 *at ('row','col'), using 'fg' as the foreground color.15 *Uses cgtab[][256] as the VSDD formatted character16 *generator table. Assumes 'ht' bit high characters in the17 *cgtable. Uses 'pitch' as the vertical spacing between18 *character rows. No error checks are done.19 *The string must fit the output area (no overlaps, single line).20 *This function leaves the zero pixels alone and just sets the21 *one pixels to the foreground color, allowing overlapping22 *character cells.23 *------------------------------------------------------------------------------1 | ------------------------------------------------------------------------------ 2 | vsplot4.s -- output characters to a 4-bit / pixel graphics window 3 | with variable vertical pitch, etc. 4 | Version 1 -- 1988-10-07 -- D.N. Lynx Crowe 5 | (c) Copyright 1988 -- D.N. Lynx Crowe 6 | ------------------------------------------------------------------------------ 7 8 | vsplot4(obase, nw, fg, row, col, str, pitch, ht, cgtab) 9 | uint |obase, nw, fg, row, col, pitch, ht, cgtab[][256]; 10 | char |str; 11 12 | Outputs characters from the string at 'str' to an 'nw' 13 | character wide 4-bit per pixel graphics window at 'obase' 14 | at ('row','col'), using 'fg' as the foreground color. 15 | Uses cgtab[][256] as the VSDD formatted character 16 | generator table. Assumes 'ht' bit high characters in the 17 | cgtable. Uses 'pitch' as the vertical spacing between 18 | character rows. No error checks are done. 19 | The string must fit the output area (no overlaps, single line). 20 | This function leaves the zero pixels alone and just sets the 21 | one pixels to the foreground color, allowing overlapping 22 | character cells. 23 | ------------------------------------------------------------------------------ 24 24 .text 25 * 25 26 26 .xdef _vsplot4 27 * 28 *Argument offsets from a6:29 * 30 OBASE .equ 8 *LONG - Output area base address31 NW .equ 12 *WORD - Character width of output area32 FG .equ 14 *WORD - Foreground color33 ROW .equ 16 *WORD - Row34 COL .equ 18 *WORD - Column35 STR .equ 20 *LONG - String base address36 PITCH .equ 24 *WORD - Vertical spacing between rows37 HT .equ 26 *WORD - Character height38 CGTAB .equ 28 *LONG - Character generator pionter39 * 40 *Program constant definitions:41 * 42 HPIX .equ 8 *Character width in pixels43 HCW .equ 4 *Horizontal character width (bytes)44 PSHIFT .equ 12 *Pixel shift into MS bits45 HSHIFT .equ 4 *Pixel right shift46 * 27 28 | Argument offsets from a6: 29 30 OBASE = 8 | LONG - Output area base address 31 NW = 12 | WORD - Character width of output area 32 FG = 14 | WORD - Foreground color 33 ROW = 16 | WORD - Row 34 COL = 18 | WORD - Column 35 STR = 20 | LONG - String base address 36 PITCH = 24 | WORD - Vertical spacing between rows 37 HT = 26 | WORD - Character height 38 CGTAB = 28 | LONG - Character generator pionter 39 40 | Program constant definitions: 41 42 HPIX = 8 | Character width in pixels 43 HCW = 4 | Horizontal character width (bytes) 44 PSHIFT = 12 | Pixel shift into MS bits 45 HSHIFT = 4 | Pixel right shift 46 47 47 .page 48 * 49 *Register usage:50 * 51 *d0 output word and scratch52 *d1 CG word and scratch53 *d2 pixel counter54 * 55 *d3 foreground color (in the 4 ms bits)56 *d4 background color (in the 4 ms bits)57 *d5 width of the area in bytes58 *d6 scan line counter59 * 60 *a0 CG table pointer61 *a1 output area scan line pointer62 *a2 input string character pointer63 * 64 *a3 output area character base pointer65 * 66 *a6 frame pointer67 *a7 stack pointer68 * 48 49 | Register usage: 50 51 | d0 output word and scratch 52 | d1 CG word and scratch 53 | d2 pixel counter 54 55 | d3 foreground color (in the 4 ms bits) 56 | d4 background color (in the 4 ms bits) 57 | d5 width of the area in bytes 58 | d6 scan line counter 59 60 | a0 CG table pointer 61 | a1 output area scan line pointer 62 | a2 input string character pointer 63 64 | a3 output area character base pointer 65 66 | a6 frame pointer 67 | a7 stack pointer 68 69 69 .page 70 * 71 _vsplot4: link a6,#0 *Link stack frames72 movem.l d3-d6/a3,-(a7) *Save registers we use73 move.w #PSHIFT,d1 *Set shift constant74 move.w FG(a6),d3 *Setup foreground color75 lsl.w d1,d3 *... in ms 4 bits of d3.W76 move.w NW(a6),d5 *Get line width in d5.W77 lsl.w #2,d5 *Multiply width by 4 for offset78 move.w ROW(a6),d0 *Calculate output address79 move.w PITCH(a6),d1 *... PITCH80 mulu d1,d0 * ... *ROW81 add.w HT(a6),d0 *... + HT-182 subq.w #1,d0 *...83 mulu d5,d0 * ... *NW84 clr.l d1 *...85 move.w COL(a6),d1 * ... +86 lsl.w #2,d1 * ... COL *487 add.l d1,d0 *...88 add.l OBASE(a6),d0 *... + OBASE89 movea.l d0,a3 *Leave output address in a390 movea.l STR(a6),a2 *Put string address in a291 * 92 cgl0: clr.l d0 *Clear out upper bits of d093 move.b (a2)+,d0 *Get next character94 beq cgl5 *Done if character EQ 095 * 96 movea.l a3,a1 *Establish output pointer in a197 adda.l #HCW,a3 *Update output pointer for next char.98 movea.l CGTAB(a6),a0 *Establish CG pointer in a099 lsl.w #1,d0 * ... 2 *character100 adda.w d0,a0 *... + cgtab address101 move.w HT(a6),d6 *Set scan line counter in d6102 subq.w #1,d6 *...103 * 70 71 _vsplot4: link a6,#0 | Link stack frames 72 movem.l d3-d6/a3,-(a7) | Save registers we use 73 move.w #PSHIFT,d1 | Set shift constant 74 move.w FG(a6),d3 | Setup foreground color 75 lsl.w d1,d3 | ... in ms 4 bits of d3.W 76 move.w NW(a6),d5 | Get line width in d5.W 77 lsl.w #2,d5 | Multiply width by 4 for offset 78 move.w ROW(a6),d0 | Calculate output address 79 move.w PITCH(a6),d1 | ... PITCH 80 mulu d1,d0 | ... | ROW 81 add.w HT(a6),d0 | ... + HT-1 82 subq.w #1,d0 | ... 83 mulu d5,d0 | ... | NW 84 clr.l d1 | ... 85 move.w COL(a6),d1 | ... + 86 lsl.w #2,d1 | ... COL | 4 87 add.l d1,d0 | ... 88 add.l OBASE(a6),d0 | ... + OBASE 89 movea.l d0,a3 | Leave output address in a3 90 movea.l STR(a6),a2 | Put string address in a2 91 92 cgl0: clr.l d0 | Clear out upper bits of d0 93 move.b (a2)+,d0 | Get next character 94 beq cgl5 | Done if character EQ 0 95 96 movea.l a3,a1 | Establish output pointer in a1 97 adda.l #HCW,a3 | Update output pointer for next char. 98 movea.l CGTAB(a6),a0 | Establish CG pointer in a0 99 lsl.w #1,d0 | ... 2 | character 100 adda.w d0,a0 | ... + cgtab address 101 move.w HT(a6),d6 | Set scan line counter in d6 102 subq.w #1,d6 | ... 103 104 104 .page 105 cgl1: move.w (a0),d1 *Get character generator word in d1106 move.w #(HPIX/2)-1,d2 *Set pixel counter in d2107 clr.l d4 *Get old output word as background108 move.w (a1),d4 *...109 swap d4 *...110 * 111 cgl2: lsr.w #HSHIFT,d0 *Shift output word right 1 pixel112 lsr.l #HSHIFT,d4 *Shift background word 1 pixel113 andi.l # $FFFFF000,d4 *Mask for upper 4 bits of d4.W114 btst.l #0,d1 *Check CG word ls bit115 beq cgl3 *Set background color if bit EQ 0116 * 117 or.w d3,d0 *OR foreground color into output word118 bra cgl4 *Go update CG word119 * 120 cgl3: or.w d4,d0 *OR background color into output word121 * 122 cgl4: lsr.w #1,d1 *Shift CG word right 1 pixel123 dbf d2,cgl2 *Loop for first 4 pixels124 * 125 move.w d0,(a1)+ *Store first output word in scan line126 move.w #(HPIX/2)-1,d2 *Set pixel counter in d2127 clr.l d4 *Get old output word as background128 move.w (a1),d4 *...129 swap d4 *...130 * 131 cgl2a: lsr.w #HSHIFT,d0 *Shift output word right 1 pixel132 lsr.l #HSHIFT,d4 *Shift background word 1 pixel133 andi.l # $FFFFF000,d4 *Mask for upper bits of d4.W134 btst.l #0,d1 *Check CG word ls bit135 beq cgl3a *Set background color if bit EQ 0136 * 137 or.w d3,d0 *OR foreground color into output word138 bra cgl4a *Go update CG word139 * 140 cgl3a: or.w d4,d0 *OR background color into output word141 * 142 cgl4a: lsr.w #1,d1 *Shift CG word right 1 pixel143 dbf d2,cgl2a *Loop for last 4 pixels144 * 145 move.w d0,(a1) *Store second output word in scan line146 suba.w d5,a1 *Update output pointer147 suba.w #2,a1 *...148 adda.l #512,a0 *Update CG pointer for next scan line149 dbf d6,cgl1 *Loop for all scan lines150 * 151 bra cgl0 *Loop for next character152 * 153 cgl5: movem.l (a7)+,d3-d6/a3 *Restore registers154 unlk a6 *Unlink stack frames155 rts *Return to caller156 * 105 cgl1: move.w (a0),d1 | Get character generator word in d1 106 move.w #(HPIX/2)-1,d2 | Set pixel counter in d2 107 clr.l d4 | Get old output word as background 108 move.w (a1),d4 | ... 109 swap d4 | ... 110 111 cgl2: lsr.w #HSHIFT,d0 | Shift output word right 1 pixel 112 lsr.l #HSHIFT,d4 | Shift background word 1 pixel 113 andi.l #0xFFFFF000,d4 | Mask for upper 4 bits of d4.W 114 btst.l #0,d1 | Check CG word ls bit 115 beq cgl3 | Set background color if bit EQ 0 116 117 or.w d3,d0 | OR foreground color into output word 118 bra cgl4 | Go update CG word 119 120 cgl3: or.w d4,d0 | OR background color into output word 121 122 cgl4: lsr.w #1,d1 | Shift CG word right 1 pixel 123 dbf d2,cgl2 | Loop for first 4 pixels 124 125 move.w d0,(a1)+ | Store first output word in scan line 126 move.w #(HPIX/2)-1,d2 | Set pixel counter in d2 127 clr.l d4 | Get old output word as background 128 move.w (a1),d4 | ... 129 swap d4 | ... 130 131 cgl2a: lsr.w #HSHIFT,d0 | Shift output word right 1 pixel 132 lsr.l #HSHIFT,d4 | Shift background word 1 pixel 133 andi.l #0xFFFFF000,d4 | Mask for upper bits of d4.W 134 btst.l #0,d1 | Check CG word ls bit 135 beq cgl3a | Set background color if bit EQ 0 136 137 or.w d3,d0 | OR foreground color into output word 138 bra cgl4a | Go update CG word 139 140 cgl3a: or.w d4,d0 | OR background color into output word 141 142 cgl4a: lsr.w #1,d1 | Shift CG word right 1 pixel 143 dbf d2,cgl2a | Loop for last 4 pixels 144 145 move.w d0,(a1) | Store second output word in scan line 146 suba.w d5,a1 | Update output pointer 147 suba.w #2,a1 | ... 148 adda.l #512,a0 | Update CG pointer for next scan line 149 dbf d6,cgl1 | Loop for all scan lines 150 151 bra cgl0 | Loop for next character 152 153 cgl5: movem.l (a7)+,d3-d6/a3 | Restore registers 154 unlk a6 | Unlink stack frames 155 rts | Return to caller 156 157 157 .end
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