/picoreality

demo cartridge generation for pico-8

Primary LanguageGo

PICO Reality

TODO

  • Palette flash to white
  • Calculate u,v,du,dv as coordinates in 2x2 quad of map for tline
  • tline for image rotation
  • Convert lens offset LUTs to data strings, unpack in working memory
  • Re-purpose two SFX instruments for sample playback markers
  • Bresenham-scale audio playback from 440Hz (C2) @ 5512Hz - maybe a LUT?
  • Move audio playback into _update60()
  • Compress orch hit
  • Better lens center, should zoom slightly
  • Can lens be bigger with newer LUTs?
  • Slow down lens bouncing - total bouncing time should be ~10 seconds
  • Use a smaller 64x64, less dithered image for spinning
  • Why doesn't memory based pixel read work properly? (doesn't matter - too slow)

Build cartgen

cd ./cwd
go build
cd ..

Build cart

./cmd/cartgen blueprint.json > ~/Library/Application\ Support/pico-8/carts/picoreality.p8

Lens color palette

Color Hex RGB Name
0 #000000 0, 0, 0 black
1 #1D2B53 29, 43, 83 dark-blue
130 #422136 66,33,54 darker-purple
131 #125359 18,83,89 blue-green
4 #AB5236 171, 82, 54 brown
5 #5F574F 95, 87, 79 dark-grey
134 #A28879 162,136,121 medium-grey
128 #291814 41,24,20 darkest-grey
129 #111D35 17,29,53 darker-blue
132 #742F29 116,47,41 dark-brown
133 #49333B 73,51,59 darker-grey
141 #754665 117,70,101 mauve
140 #065AB5 6,90,181 true-blue
13 #83769C 131, 118, 156 lavender
143 #FF9D81 255,157,129 peach
15 #FFCCAA 255, 204, 170 light-peach

Dithered flicker

data={}
data.lens_pal={0,1,130,131,4,5,134,128,129,132,133,141,140,13,143,15}
for i=1,16 do
  pal(i-1,data.lens_pal[i],1)
end

p=0
cls()

function _update60()
  p=1-p
  fillp(23130)
  if(p>0)fillp(-23131)
  for i=0,15 do
    for j=0,15 do
      rectfill(i*8,j*8,i*8+7,j*8+7,i+j*16)
    end
  end
end

Manual palette fade-out/white-out

For each I below, locate in palette index that is darker and enter it as DI

I:   0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
DI:  0 17 18 19 20 16 22  6 24 25  9 27 28 29 29 31  0  0 16 17 16 16  5  0  2  4  0  3  1 18  2  4

For each I below, locate in palette index that is lighter and enter it as DI

I:   0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
LI: 17 28 24 27 25 22  7  7  6 10 23 26  6  6 15  7  2  1  2  3  4  5  6  7  8  9 23 26 12 13 15 15

References

The Land of Dead Ideas That Didn't Work But That I Don't Want to Forget

cos(0.76993)=0.1251 sin(0.51993)=0.1251 cos(0.26)

Read sprite pixel

peek((sy<<6)+(sx>>1))>>((sx&1)<<2)&0xf

Bresenham's Circle

void plotCircle(int xm, int ym, int r) {
   int x = -r, y = 0, err = 2-2*r; /* II. Quadrant */ 
   do {
      setPixel(xm-x, ym+y); /*   I. Quadrant */
      setPixel(xm-y, ym-x); /*  II. Quadrant */
      setPixel(xm+x, ym-y); /* III. Quadrant */
      setPixel(xm+y, ym+x); /*  IV. Quadrant */
      r = err;
      if (r <= y) err += ++y*2+1;
      if (r > x || err > y) err += ++x*2+1; 
   } while (x < 0);
}

Lens color palette

Color Hex RGB Name 565 Crushed RGB
0 #000000 0, 0, 0 black 0x0000 #000000
1 #1D2B53 29, 43, 83 dark-blue 0x194a #182850
130 #422136 66,33,54 darker-purple 0x4106 #402030
131 #125359 18,83,89 blue-green 0x128b #105058
4 #AB5236 171, 82, 54 brown 0xaa86 #a85030
5 #5F574F 95, 87, 79 dark-grey 0x5aa9 #585448
134 #A28879 162,136,121 medium-grey 0xa44f #a08878
128 #291814 41,24,20 darkest-grey 0x28c2 #281810
129 #111D35 17,29,53 darker-blue 0x10e6 #101c30
132 #742F29 116,47,41 dark-brown 0x7165 #702c28
133 #49333B 73,51,59 darker-grey 0x4987 #483038
141 #754665 117,70,101 mauve 0x722c #704460
140 #065AB5 6,90,181 true-blue 0x02d6 #0058b0
13 #83769C 131, 118, 156 lavender 0x83b3 #807498
143 #FF9D81 255,157,129 peach 0xfcf0 #f89c80
15 #FFCCAA 255, 204, 170 light-peach 0xfe75 #f8cca8