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basic: convert_tgreene: add help message
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Vince Weaver
parent
105148be9d
commit
5b059ab037
@ -1,16 +1,34 @@
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/* code by qkumba */
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/* Based on code by qkumba */
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/* TGreene improved the algorithm to be a bit smaller */
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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/* ASCII offset */
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#define OFFSET 35
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#define OFFSET2 35
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//#define OFFSET 35
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/* We are jumping into the decoded code using the & operator */
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/* This just does a jmp to $3F5 */
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/* Easiest is to just load our code there */
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/* The problem is this loads most of the code to the 1st text/lo-res page */
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/* For text/lo-res programs instead load code so it ends at $3F8, */
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/* usually you have a 3-byte jmp to the start of your code at $3F5 */
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#define END_AT_3F5 0
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#define BEGIN_AT_3F5 1
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static int print_help(char *name) {
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printf("\n");
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printf("Usage: %s [-e] [-h]\n",name);
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printf("\t-e : ends program at 3F5 (useful for lo-res programs)\n");
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printf("\t default is to start program at 3F5\n");
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printf("\n");
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return 0;
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}
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int main(int argc, char **argv) {
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@ -28,6 +46,10 @@ int main(int argc, char **argv) {
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if (argv[1][1]=='e') {
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mode=END_AT_3F5;
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}
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if (argv[1][1]=='h') {
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print_help(argv[0]);
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exit(1);
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}
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}
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}
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@ -12,11 +12,12 @@ all: star.dsk
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$(DOS33):
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cd ../../../utils/dos33fs-utils && make
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star.dsk: $(DOS33) HELLO STAR STARS
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star.dsk: $(DOS33) HELLO STAR STARS STARS_BOT
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cp $(EMPTY_DISK)/empty.dsk star.dsk
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$(DOS33) -y star.dsk SAVE A HELLO
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$(DOS33) -y star.dsk BSAVE -a 0xc00 STAR
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$(DOS33) -y star.dsk BSAVE -a 0xc00 STARS
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$(DOS33) -y star.dsk BSAVE -a 0xc00 STARS_BOT
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###
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@ -42,14 +43,14 @@ stars.o: stars.s
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###
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STAR_BOT: star_bot.o
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ld65 -o STAR_BOT star_bot.o -C $(LINKERSCRIPTS)/apple2_36b.inc
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STARS_BOT: stars_bot.o
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ld65 -o STARS_BOT stars_bot.o -C $(LINKERSCRIPTS)/apple2_c00.inc
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star_bot.o: star_bot.s
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ca65 -o star_bot.o star_bot.s -l star_bot.lst
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stars_bot.o: stars_bot.s
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ca65 -o stars_bot.o stars_bot.s -l stars_bot.lst
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###
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clean:
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rm -f *~ *.o *.lst HELLO STAR STAR_BOT
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rm -f *~ *.o *.lst HELLO STAR STARS STARS_BOT
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@ -8,6 +8,7 @@
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; 140 bytes -- 0 is already in X
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; 143 bytes -- stars move independently
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; 140 bytes -- optimize XPOS in multiple calls to draw_stars
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; 145 bytes -- color changing background
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SPEAKER = $C030
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SET_GR = $C050
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@ -33,7 +34,7 @@ XPOS = $77
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FRAME = $6D
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PAGE = $6E
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LINE = $6F
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;.zeropage
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;.globalzp pattern_smc
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@ -62,7 +63,11 @@ main_loop:
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jsr WAIT
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inc FRAME ; increment frame #
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bne no_cs
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inc bg_smc+1
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no_cs:
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;=================================
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; clear lo-res screen, page1/page2
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;=================================
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@ -71,6 +76,7 @@ main_loop:
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ldx #4 ; lores is 1k, so 4 pages
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full_loop:
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ldy #$00 ; clear whole page
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bg_smc:
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lda #$55 ; color
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inner_loop:
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sta (OUTL),Y
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@ -13,6 +13,8 @@
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; 143 bytes -- speed up the color transition
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; 144 bytes -- tried to share adjust_page in subroutine, backfired
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; 143 bytes -- revert last change
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; 142 bytes -- draw stars right to left
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; 141 bytes -- assume GBASCALC always leaves C set to 0
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SPEAKER = $C030
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SET_GR = $C050
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@ -24,7 +26,7 @@ LORES = $C056 ; Enable LORES graphics
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HGR2 = $F3D8
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PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
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GBASCALC = $F847 ; Y in A, put addr in GBASL/GBASH
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GBASCALC = $F847 ; Y in A, put addr in GBASL/GBASH (what is C?)
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SETGR = $FB40
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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@ -33,6 +35,7 @@ GBASH = $27
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YPOS = $76
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XPOS = $77
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PO = $78
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FRAME = $6D
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PAGE = $6E
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@ -55,7 +58,7 @@ main_loop:
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asl ; make OUTH $4 or $8 depending on value in PAGE
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; which we have in A above or at end of loop
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asl ; C is 0
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asl ; (this also sets C to 0)
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adc #4
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sta GBASH
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@ -63,11 +66,11 @@ main_loop:
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inc FRAME ; increment frame #
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lda FRAME
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and #$1f ; cycle colors ever 32 frames
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bne no_cs
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bne no_color_cycle
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inc bg_smc+1
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no_cs:
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no_color_cycle:
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lda #100 ; pause a bit
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jsr WAIT
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@ -79,10 +82,10 @@ no_cs:
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; clear lo-res screen, page1/page2
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;=================================
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; proper with avoiding screen holes is ~25 instructions
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; this is more like 16
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; assume GBASL/GBASH already points to proper $400 or $800
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ldx #4 ; lores is 1k, so 4 pages
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; stx GBASH
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; jsr adjust_page
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full_loop:
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ldy #$00 ; clear whole page
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bg_smc:
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@ -96,12 +99,15 @@ inner_loop:
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dex
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bne full_loop
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; X=0
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; Y=0
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; A=color
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;====================
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; draw the stars
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;====================
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txa ; X is zero here
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lda #32 ; start from right to save a byte
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;======================
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; draw 8x8 bitmap star
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@ -112,7 +118,6 @@ draw_star:
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; calculate YPOS
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sta XPOS
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; lda XPOS
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lsr ; make middle star offset+4 from others
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lsr
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@ -130,17 +135,15 @@ boxloop:
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adc YPOS
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jsr GBASCALC ; calc address of line in X (Y-coord)
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; GBASL is in A at this point
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; is C always 0?
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clc
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; clc
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adc XPOS ; adjust to X-coord
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sta GBASL
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; adjust for proper page
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; jsr adjust_page
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lda PAGE ; want to add 0 or 4 (not 0 or 1)
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asl
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asl ; this sets C to 0
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@ -172,23 +175,22 @@ its_transparent:
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dex
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bpl boxloop
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lda XPOS
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clc
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adc #16
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cmp #48
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bne draw_star
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lda XPOS ; move to next position
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; going right to left saves 2 bytes for cmp
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sec
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sbc #16
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bpl draw_star
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; X is $FF here
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; Y is $FF here
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; A is 48 here
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; A is -16 here
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;======================
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; flip page
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;======================
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lda PAGE
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lda PAGE ; 0 or 1
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tax
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ldy PAGE1,X ; flip page
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@ -198,19 +200,10 @@ its_transparent:
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bpl main_loop ; bra
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; GBASL in A
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;adjust_page:
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; sta GBASL
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; lda PAGE ; want to add 0 or 4 (not 0 or 1)
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; asl
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; asl ; this sets C to 0
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; adc GBASH
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; sta GBASH
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; rts
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;=================
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; star bitmap
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;=================
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;012|456|
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; @ ;
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