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https://github.com/lscharen/iigs-game-engine.git
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Add small header to converted image data
This commit is contained in:
Lucas Scharenbroich
parent
9d33ff3000
commit
d9e3ee14e8
131
src/App.Main.s
131
src/App.Main.s
@ -416,10 +416,34 @@ CopyBinToField
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:col_cnt equ tmp5
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:mask equ tmp6
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:data equ tmp7
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:mask_color equ tmp8
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sta :srcptr
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stx :srcptr+2
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; Check that this is a GTERAW image and save the transparent color
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ldy #4
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:chkloop
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lda [:srcptr],y
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cmp :headerStr,y
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beq *+3
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rts
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dey
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dey
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bpl :chkloop
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; We have a valid header, now get the transparency word and load it in
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ldy #6
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lda [:srcptr],y
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sta :mask_color
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; Advance over the header
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lda :srcptr
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clc
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adc #8
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sta :srcptr
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stz :line_cnt
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:rloop
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lda :line_cnt ; get the pointer to the code field line
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@ -440,12 +464,15 @@ CopyBinToField
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:cloop
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phy
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lda [:srcptr],y ; load the picture data
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cmp :mask_color
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beq :transparent ; a value of $0000 is transparent
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jsr :toMask ; Infer a mask value for this. If it's $0000, then
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cmp #$0000
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bne :mixed ; the data is solid, otherwise mixed
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; This is a solid word
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:solid
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lda [:srcptr],y
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ldy Col2CodeOffset,x ; Get the offset to the code from the line start
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@ -457,6 +484,10 @@ CopyBinToField
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sta [:dstptr],y ; PEA operand
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bra :next
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:transparent
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lda :mask_color ; Make sure we actually have to mask
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cmp #$A5A5
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beq :solid
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ldy Col2CodeOffset,x ; Get the offset to the code from the line start
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lda #$B1 ; LDA (dp),y
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sta [:dstptr],y
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@ -494,7 +525,9 @@ CopyBinToField
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iny
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iny
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iny ; advance to the ORA #imm operand
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lda :data
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lda :mask
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eor #$FFFF ; invert the mask to clear up the data
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and :data
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sta [:dstptr],y
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:next
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@ -522,31 +555,57 @@ CopyBinToField
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:exit
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rts
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:toMask bit #$F000
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beq *+7
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and #$0FFF
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bra *+5
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ora #$F000
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:toMask pha ; save original
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bit #$0F00
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lda 1,s
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eor :mask_color ; only identical bits produce zero
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and #$F000
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beq *+7
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and #$F0FF
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pea #$0000
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bra *+5
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ora #$0F00
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pea #$F000
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bit #$00F0
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beq *+7
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and #$FF0F
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bra *+5
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ora #$00F0
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bit #$000F
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lda 3,s
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eor :mask_color
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and #$0F00
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beq *+7
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and #$FFF0
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pea #$0000
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bra *+5
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ora #$000F
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pea #$0F00
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lda 5,s
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eor :mask_color
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and #$00F0
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beq *+7
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pea #$0000
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bra *+5
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pea #$00F0
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lda 7,s
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eor :mask_color
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and #$000F
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beq *+7
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lda #$0000
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bra *+5
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lda #$000F
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ora 1,s
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sta 1,s
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pla
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ora 1,s
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sta 1,s
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pla
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ora 1,s
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sta 1,s
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pla
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sta 1,s ; pop the saved word
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pla
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rts
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:headerStr asc 'GTERAW'
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; Copy a loaded SHR picture into the code field
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;
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; A=low word of picture address
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@ -710,6 +769,12 @@ CopyBinToBG1
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stx :srcptr+2
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sty :dstptr+2 ; Everything goes into this bank
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; Advance over the header
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lda :srcptr
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clc
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adc #8
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sta :srcptr
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stz :line_cnt
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:rloop
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lda :line_cnt ; get the pointer to the code field line
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@ -843,8 +908,14 @@ GrafInit
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dw $0fa9,$0ff0,$00e0,$04DF
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dw $0d00,$078f,$0ccc,$0FFF
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; Super Mario World Assets
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DefaultPalette dw $0EEF,$0342,$0C95,$0852,$0DB4,$00C0
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dw $0FDA,$0DEE,$0000,$0CC5,$09A0,$0680,$0470,$0051
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;DefaultPalette dw $0000,$0000,$0778,$0BCC,$0368,$00AF,$0556,$0245
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dw $0000,$0778,$0AAA,$0CFF,$0368,$00AF,$0556
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; Return the current border color ($0 - $F) in the accumulator
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GetBorderColor lda #0000
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sep #$20
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@ -1170,6 +1241,32 @@ qtRec adrl $0000
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@ -5,6 +5,7 @@ const { Buffer } = require('buffer');
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// Starting color index
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let startIndex = 0;
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let transparentColor = 0;
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main(process.argv.slice(2)).then(
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() => process.exit(0),
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@ -110,6 +111,7 @@ async function main(argv) {
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const data = await fs.readFile(argv[0]);
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const png = PNG.sync.read(data);
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startIndex = getArg(argv, '--start-index', x => parseInt(x, 10), 0);
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transparentColor = getArg(argv, '--transparent-color-index', x => parseInt(x, 10), 0);
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console.info(`startIndex = ${startIndex}`);
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@ -147,7 +149,22 @@ async function main(argv) {
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if (buff && argv[1]) {
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console.log(`Writing to output file ${argv[1]}`);
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await fs.writeFile(argv[1], buff);
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// Write a small header. This is useful and avoids triggering a sparse file load
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// bug when the first block of the file on the GS/OS drive is sparse.
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// Put the ASCII text of "GTERAW" in the first 6 bytes
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const header = Buffer.alloc(8);
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header.write('GTERAW', 'latin1');
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// Use the special value $A5A5 to identify no transparency
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if (typeof transparentColor !== 'number') {
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header.writeUInt16LE(0xA5A5);
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} else {
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header.writeUInt16LE(0x1111 * transparentColor, 6);
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}
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await fs.writeFile(argv[1], Buffer.concat([header, buff]));
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}
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}
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