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Add a routine to clear the screen, in the demo game. Untested.

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This commit is contained in:
Chris Pressey 2017-12-11 14:09:55 +00:00
parent b395dbcfda
commit b6ae45e0cb
1 changed files with 39 additions and 5 deletions
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44
eg/proto-game.60p
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@ -3,9 +3,19 @@
// ****************************
// ----------------------------------------------------------------
// Variables
// Global Variables and System Locations
// ----------------------------------------------------------------
byte table screen1 @ 1024
byte table screen2 @ 1274
byte table screen3 @ 1524
byte table screen4 @ 1774
byte table colormap1 @ 55296
byte table colormap2 @ 55546
byte table colormap3 @ 55796
byte table colormap4 @ 56046
buffer[2048] screen @ 1024
byte joy2 @ $dc00
@ -44,7 +54,7 @@ vector dispatch_game_state
trashes a, x, y, c, z, n, v, ptr
// ----------------------------------------------------------------
// Routines
// Utility Routines
// ----------------------------------------------------------------
routine read_stick
@ -80,6 +90,29 @@ routine read_stick
}
}
routine clear_screen
outputs screen1, screen2, screen3, screen4, colormap1, colormap2, colormap3, colormap4
trashes a, y, c, n, z
{
ld y, 0
repeat {
ld a, 1
st a, colormap1 + y
st a, colormap2 + y
st a, colormap3 + y
st a, colormap4 + y
ld a, 32
st a, screen1 + y
st a, screen2 + y
st a, screen3 + y
st a, screen4 + y
inc y
cmp y, 250
} until z
}
// ----------------------------------------------------------------
// Game States
// ----------------------------------------------------------------
@ -118,10 +151,11 @@ routine our_cinv
routine main
inputs cinv
outputs cinv, save_cinv, pos, dispatch_game_state
trashes a, n, z
outputs cinv, save_cinv, pos, dispatch_game_state,
screen1, screen2, screen3, screen4, colormap1, colormap2, colormap3, colormap4
trashes a, y, n, c, z
{
// jsr clear_screen
call clear_screen
copy game_state_play, dispatch_game_state
copy word 0, pos