mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-25 18:33:11 +00:00
126 lines
2.8 KiB
Plaintext
126 lines
2.8 KiB
Plaintext
|
|
$include('ntsc.ice')
|
|
|
|
// -------------------------
|
|
|
|
algorithm frame_display(
|
|
input uint10 pix_x,
|
|
input uint10 pix_y,
|
|
input uint1 pix_active,
|
|
input uint1 pix_vblank,
|
|
output! uint$color_depth$ pix_r,
|
|
output! uint$color_depth$ pix_g,
|
|
output! uint$color_depth$ pix_b
|
|
) <autorun> {
|
|
|
|
$include('font_cp437_8x8.ice')
|
|
|
|
// 256x256 cells (240 lines used)
|
|
dualport_bram uint1 cells[65536] = uninitialized;
|
|
// previous 2 rows
|
|
dualport_bram uint1 row1[256] = uninitialized;
|
|
dualport_bram uint1 row2[256] = uninitialized;
|
|
|
|
// 3x3 pixel mask around x/y
|
|
uint9 neigh = 0;
|
|
|
|
// offsets to X and Y coordinate
|
|
uint8 xx := pix_x[0,8];
|
|
uint8 yy := pix_y[0,8];
|
|
uint8 xxm3 := xx - 3;
|
|
uint8 xxm1 := xx - 1;
|
|
uint8 yym1 := yy - 1;
|
|
|
|
// count # of live neigbors (up to 8)
|
|
uint3 ncount ::=
|
|
neigh[0,1] + neigh[1,1] + neigh[2,1]
|
|
+ neigh[3,1] + neigh[5,1]
|
|
+ neigh[6,1] + neigh[7,1] + neigh[8,1];
|
|
|
|
// pixel is set if:
|
|
// * 3 live neighbors
|
|
// * 2 live neigbors and was already alive
|
|
uint1 alive ::= (ncount == 3) || (ncount == 2 && neigh[4,1]);
|
|
|
|
// by default r,g,b are set to zero
|
|
pix_r := 0;
|
|
pix_g := 0;
|
|
pix_b := 0;
|
|
|
|
// set dual-port block RAM bus addresses (continuously)
|
|
row1.addr0 := xx;
|
|
row2.addr0 := xx;
|
|
cells.addr0 := {yy, xx};
|
|
row1.addr1 := xxm1;
|
|
row2.addr1 := xxm1;
|
|
cells.addr1 := {yym1, xxm3};
|
|
row1.wenable1 := 1;
|
|
row2.wenable1 := 1;
|
|
cells.wenable1 = 1;
|
|
|
|
// ---------- show time!
|
|
while (1) {
|
|
// display frame
|
|
while (pix_vblank == 0) {
|
|
if (pix_active) {
|
|
// shift neighbor cells to the left by 1 pixel
|
|
// while adding right pix from row1/row2/cells array
|
|
neigh = {
|
|
neigh[6,2], row1.rdata0,
|
|
neigh[3,2], row2.rdata0,
|
|
neigh[0,2], cells.rdata0
|
|
};
|
|
// copy alive -> cells -> row2 -> row1
|
|
row1.wdata1 = row2.rdata0;
|
|
row2.wdata1 = cells.rdata0;
|
|
cells.wdata1 = alive;
|
|
// set RGB color based on surroundings
|
|
pix_r = ncount * 31;
|
|
pix_g = neigh[4,1] * 255;
|
|
pix_b = alive * 255;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// -------------------------
|
|
|
|
algorithm main(
|
|
output! uint$color_depth$ video_r,
|
|
output! uint$color_depth$ video_g,
|
|
output! uint$color_depth$ video_b,
|
|
output! uint1 video_hs,
|
|
output! uint1 video_vs
|
|
)
|
|
<@clock,!reset>
|
|
{
|
|
|
|
uint1 active = 0;
|
|
uint1 vblank = 0;
|
|
uint10 pix_x = 0;
|
|
uint10 pix_y = 0;
|
|
|
|
ntsc ntsc_driver (
|
|
ntsc_hs :> video_hs,
|
|
ntsc_vs :> video_vs,
|
|
active :> active,
|
|
vblank :> vblank,
|
|
ntsc_x :> pix_x,
|
|
ntsc_y :> pix_y
|
|
);
|
|
|
|
frame_display display (
|
|
pix_x <: pix_x,
|
|
pix_y <: pix_y,
|
|
pix_active <: active,
|
|
pix_vblank <: vblank,
|
|
pix_r :> video_r,
|
|
pix_g :> video_g,
|
|
pix_b :> video_b
|
|
);
|
|
|
|
// forever
|
|
while (1) {
|
|
}
|
|
}
|