fireworks: draw stars
This commit is contained in:
Vince Weaver
parent
2b529a332f
commit
1809209c28
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@ -0,0 +1,45 @@
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; 16-bit 6502 Random Number Generator
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; Linear feedback shift register PRNG by White Flame
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; http://codebase64.org/doku.php?id=base:small_fast_16-bit_prng
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; The Apple II KEYIN routine increments this field
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; while waiting for keypress
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SEEDL = $4E
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SEEDH = $4F
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XOR_MAGIC = $7657 ; "vW"
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random16:
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lda SEEDL
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beq lowZero ; $0000 and $8000 are special values // ; Do a normal shift
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asl SEEDL
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lda SEEDH
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rol
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bcc noEor
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doEor:
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; high byte is in .A
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eor #>XOR_MAGIC
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sta SEEDH
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lda SEEDL
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eor #<XOR_MAGIC
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sta SEEDL
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rts
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lowZero:
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lda SEEDH
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beq doEor ; High byte is also zero, so apply the EOR
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; wasn't zero, check for $8000
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asl
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beq noEor ; if $00 is left after the shift
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; then it was $80
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bcs doEor ; else, do the EOR based on the carry bit
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noEor:
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sta SEEDH
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rts
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@ -16,7 +16,7 @@ fireworks.dsk: FIREWORKS.BAS FIREWORKS
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FIREWORKS: fireworks.o
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ld65 -o FIREWORKS fireworks.o -C ../linker_scripts/apple2_1000.inc
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fireworks.o: fireworks.s gr_copy.s \
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fireworks.o: fireworks.s gr_copy.s random16.s fw.s \
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background_final.inc
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ca65 -o fireworks.o fireworks.s -l fireworks.lst
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@ -16,6 +16,7 @@ BASL = $28
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BASH = $29
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FRAME = $60
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BLARGH = $69
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HGR_COLOR = $E4
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DRAW_PAGE = $EE
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LASTKEY = $F1
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PADDLE_STATUS = $F2
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@ -35,13 +36,22 @@ PADDL0 = $C064
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PTRIG = $C070
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; ROM routines
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HGR = $F3E2
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HPLOT0 = $F457
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TEXT = $FB36 ;; Set text mode
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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COLORTBL= $F6F6
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MAX = 3
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jsr draw_fireworks
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;==================================
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;==================================
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lda #$ff
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sta WHICH
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@ -342,6 +352,8 @@ gr_offsets:
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.include "../asm_routines/gr_unrle.s"
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.include "../asm_routines/keypress.s"
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.include "gr_copy.s"
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.include "random16.s"
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.include "fw.s"
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pictures:
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.word bg_final_low,bg_final_high
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@ -0,0 +1,235 @@
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;=======================================================================
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; Based on BASIC program posted by FozzTexx, originally written in 1987
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;=======================================================================
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NUMSTARS = 16
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;const int ysize=160,xsize=280,margin=24;
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;
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;int xpos;
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;
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;signed char o,i;
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;signed char color_group,x_velocity,cs,max_steps;
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;unsigned char xpos_l;
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;unsigned char ypos_h,ypos_l;
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;signed char y_velocity_h;
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;unsigned char y_velocity_l;
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;unsigned char y_old=0,y_even_older;
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;unsigned char x_old=0,x_even_older;
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;unsigned char peak;
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;void routine_370(void) {
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; hplot(xpos+o,ypos_h+o); // NE
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; hplot(xpos-o,ypos_h-o); // SW
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; hplot(xpos+o,ypos_h-o); // SE
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; hplot(xpos-o,ypos_h+o); // NW
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; hplot(xpos,ypos_h+(o*1.5)); // N
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; hplot(xpos+(o*1.5),ypos_h); // E
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; hplot(xpos,ypos_h-(o*1.5)); // S
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; hplot(xpos-(o*1.5),ypos_h); // W
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;}
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draw_fireworks:
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jsr HOME ; clear screen
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jsr HGR ; set high-res, clear screen, page0
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jsr draw_stars ; draw the stars
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label_180:
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; random_6502();
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; color_group=ram[SEED]&1; // HGR color group (PG or BO)
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; random_6502();
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; x_velocity=(ram[SEED]&0x3)+1; // x velocity = 1..4
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; random_6502();
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; y_velocity_h=-((ram[SEED]&0x3)+3); // y velocity = -3..-6
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; y_velocity_l=0;
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; random_6502();
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; max_steps=(ram[SEED]&0x1f)+33; // 33..64
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; /* launch from the two hills */
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; random_6502();
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; xpos_l=ram[SEED]&0x3f;
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; random_6502();
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; if (ram[SEED]&1) {
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; xpos_l+=24; // 24-88 (64)
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; }
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; else {
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; xpos_l+=191; // 191-255 (64)
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; }
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; ypos_h=ysize; // start at ground
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; ypos_l=0;
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; peak=ypos_h; // peak starts at ground?
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; /* Aim towards center of screen */
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; /* TODO: merge this with hill location? */
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; if (xpos_l>xsize/2) {
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; x_velocity=-x_velocity;
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; }
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; /* Draw rocket */
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; for(cs=1;cs<=max_steps;cs++) {
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; y_even_older=y_old;
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; y_old=ypos_h;
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; x_even_older=x_old;
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; x_old=xpos_l;
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; /* Move rocket */
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; xpos_l=xpos_l+x_velocity;
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; /* 16 bit add */
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; add16(&ypos_h,&ypos_l,y_velocity_h,y_velocity_l);
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; /* adjust Y velocity, slow it down */
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;// c=0;
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;// a=y_velocity_l;
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;// adc(0x20); // 0x20 = 0.125
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;// y_velocity_l=a;
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;// a=y_velocity_h;
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;// adc(0);
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;// y_velocity_h=a;
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; sadd16(&y_velocity_h,&y_velocity_l,0x00,0x20);
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; /* if we went higher, adjust peak */
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; if (ypos_h<peak) peak=ypos_h;
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; /* check if out of bounds and stop moving */
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; if (xpos_l<=margin) {
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; cs=max_steps; // too far left
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; }
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; if (xpos_l>=(xsize-margin)) {
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; cs=max_steps; // too far right
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; }
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; if (ypos_h<=margin) {
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; cs=max_steps; // too far up
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; }
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; // if falling downward
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; if (y_velocity_h>0) {
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; // if too close to ground, explode
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; if (ypos_h>=ysize-margin) {
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; cs=max_steps;
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; }
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; // if fallen a bit past peak, explode
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; if (ypos_h>ysize-(ysize-peak)/2) {
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; cs=max_steps;
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; }
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; }
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; // if not done, draw rocket
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; if (cs<max_steps) {
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; hcolor_equals(color_group*4+3);
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; hplot(x_old,y_old);
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; hplot_to(xpos_l,ypos_h);
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;
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; }
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; // erase with proper color black
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; hcolor_equals(color_group*4);
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; hplot(x_even_older,y_even_older);
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; hplot_to(x_old,y_old);
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;
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; grsim_update();
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; ch=grsim_input();
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; if (ch=='q') exit(0);
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; usleep(50000);
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;
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; }
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;
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;
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;label_290:
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; /* Draw explosion near x_old, y_old */
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; xpos=x_old;
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; xpos+=(random()%20)-10; // x +/- 10
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;
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; ypos_h=y_old;
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; ypos_h+=(random()%20)-10; // y +/- 10
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;
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; hcolor_equals(color_group*4+3); // draw white (with fringes)
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;
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; hplot(xpos,ypos_h); // draw at center of explosion
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;
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; /* Spread the explosion */
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; for(i=1;i<=9;i++) {
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; /* Draw spreading dots in white */
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; if (i<9) {
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; o=i;
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; hcolor_equals(color_group*4+3);
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; routine_370();
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; }
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; /* erase old */
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; o=i-1;
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; hcolor_equals(color_group*4);
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; routine_370();
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;
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; grsim_update();
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; ch=grsim_input();
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; if (ch=='q') break;
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; usleep(50000);
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; }
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;
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; /* randomly draw more explosions */
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; random_6502();
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; if (ram[SEED]&1) goto label_290;
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;
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;
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; goto label_180;
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;
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jsr wait_until_keypressed
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rts
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draw_stars:
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; HCOLOR = 3, white (though they are drawn purple)
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ldx #3
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lda COLORTBL,X ; get color from table
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sta HGR_COLOR
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ldy #0
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star_loop:
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tya
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pha
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; HPLOT X,Y
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; X= (y,x), Y=a
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ldx stars,Y
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lda stars+1,Y
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ldy #0
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jsr HPLOT0
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pla
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tay
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iny
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iny
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cpy #NUMSTARS*2
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bne star_loop
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rts
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stars: ; even x so they are purple
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.byte 28,107, 108, 88, 126, 88, 136, 95
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.byte 150,108, 148,120, 172,124, 180,109
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.byte 216, 21, 164, 40, 124, 18, 60, 12
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.byte 240,124, 94,125, 12, 22, 216,116
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@ -0,0 +1,45 @@
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; 16-bit 6502 Random Number Generator
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; Linear feedback shift register PRNG by White Flame
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; http://codebase64.org/doku.php?id=base:small_fast_16-bit_prng
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; The Apple II KEYIN routine increments this field
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; while waiting for keypress
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SEEDL = $4E
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SEEDH = $4F
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XOR_MAGIC = $7657 ; "vW"
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random16:
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lda SEEDL
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beq lowZero ; $0000 and $8000 are special values // ; Do a normal shift
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asl SEEDL
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lda SEEDH
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rol
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bcc noEor
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doEor:
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; high byte is in .A
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eor #>XOR_MAGIC
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sta SEEDH
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lda SEEDL
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eor #<XOR_MAGIC
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sta SEEDL
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rts
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lowZero:
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lda SEEDH
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beq doEor ; High byte is also zero, so apply the EOR
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; wasn't zero, check for $8000
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asl
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beq noEor ; if $00 is left after the shift
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; then it was $80
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bcs doEor ; else, do the EOR based on the carry bit
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noEor:
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sta SEEDH
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rts
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@ -13,10 +13,11 @@
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const int ysize=160,xsize=280,margin=24;
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double xpos;
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int i,o;
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int xpos;
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signed char o,i;
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signed char color_group,x_velocity,cs,max_steps;
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unsigned char xpos_l;
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unsigned char ypos_h,ypos_l;
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signed char y_velocity_h;
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unsigned char y_velocity_l;
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@ -24,6 +25,33 @@ unsigned char y_old=0,y_even_older;
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unsigned char x_old=0,x_even_older;
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unsigned char peak;
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#define NUMSTARS 16
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struct star_type {
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unsigned char x;
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unsigned char y;
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} stars[NUMSTARS] = {
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// even x so they are purple
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{28,107},
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{108,88},
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{126,88},
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{136,95},
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{150,105},
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{148,120},
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{172,124},
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{180,109},
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{216,21},
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{164,40},
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{124,18},
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{60,12},
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{240,124},
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{94,125},
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{12,22},
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{216,116},
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};
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#define SEED 0
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#define MAGIC "vW" // $7657
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@ -130,6 +158,8 @@ int main(int argc, char **argv) {
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hgr();
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soft_switch(MIXCLR); // Full screen
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label_180:
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random_6502();
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color_group=ram[SEED]&1; // HGR color group (PG or BO)
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@ -144,13 +174,13 @@ label_180:
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/* launch from the two hills */
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random_6502();
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xpos=ram[SEED]&0x3f;
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xpos_l=ram[SEED]&0x3f;
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random_6502();
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if (ram[SEED]&1) {
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xpos+=24; // 24-88 (64)
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xpos_l+=24; // 24-88 (64)
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}
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else {
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xpos+=191; // 191-255 (64)
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xpos_l+=191; // 191-255 (64)
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}
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@ -161,7 +191,7 @@ label_180:
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/* Aim towards center of screen */
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/* TODO: merge this with hill location? */
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if (xpos>xsize/2) {
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if (xpos_l>xsize/2) {
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x_velocity=-x_velocity;
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}
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@ -170,10 +200,10 @@ label_180:
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y_even_older=y_old;
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y_old=ypos_h;
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x_even_older=x_old;
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x_old=xpos;
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x_old=xpos_l;
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/* Move rocket */
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xpos=xpos+x_velocity;
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xpos_l=xpos_l+x_velocity;
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/* 16 bit add */
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add16(&ypos_h,&ypos_l,y_velocity_h,y_velocity_l);
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@ -192,11 +222,11 @@ label_180:
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if (ypos_h<peak) peak=ypos_h;
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/* check if out of bounds and stop moving */
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if (xpos<=margin) {
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if (xpos_l<=margin) {
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cs=max_steps; // too far left
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}
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if (xpos>=(xsize-margin)) {
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if (xpos_l>=(xsize-margin)) {
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cs=max_steps; // too far right
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}
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@ -221,7 +251,7 @@ label_180:
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if (cs<max_steps) {
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hcolor_equals(color_group*4+3);
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hplot(x_old,y_old);
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hplot_to(xpos,ypos_h);
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hplot_to(xpos_l,ypos_h);
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}
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// erase with proper color black
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@ -239,10 +269,10 @@ label_180:
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label_290:
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/* Draw explosion near x_old, y_old */
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xpos=floor(x_old);
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ypos_h=floor(y_old);
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xpos=x_old;
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xpos+=(random()%20)-10; // x +/- 10
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ypos_h=y_old;
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ypos_h+=(random()%20)-10; // y +/- 10
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hcolor_equals(color_group*4+3); // draw white (with fringes)
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@ -269,10 +299,15 @@ label_290:
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}
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/* randomly draw more explosions */
|
||||
if (random()%2) goto label_290;
|
||||
random_6502();
|
||||
if (ram[SEED]&1) goto label_290;
|
||||
|
||||
hcolor_equals(3);
|
||||
for(i=0;i<NUMSTARS;i++) {
|
||||
hplot(stars[i].x,stars[i].y);
|
||||
}
|
||||
|
||||
goto label_180;
|
||||
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue