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https://github.com/irmen/prog8.git
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c38508c262
forever loop is gone (use repeat without iteration count). struct literal is now same as array literal [...] to avoid parsing ambiguity with scope blocks.
127 lines
4.0 KiB
Lua
127 lines
4.0 KiB
Lua
%import c64lib
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%import c64utils
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%zeropage basicsafe
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main {
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ubyte perform_scroll = false
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sub start() {
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c64.SPRPTR[0] = $0f00 / 64
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c64.SPENA = 1
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c64.SP0COL = 14
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c64.SPXY[0] = 80
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c64.SPXY[1] = 100
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c64.SCROLX &= %11110111 ; 38 column mode
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c64utils.set_rasterirq(1) ; enable animation
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ubyte target_height = 10
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ubyte active_height = 24
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ubyte upwards = true
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repeat {
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ubyte mountain = 223 ; slope upwards
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if active_height < target_height {
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active_height++
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upwards = true
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} else if active_height > target_height {
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mountain = 233 ; slope downwards
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active_height--
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upwards = false
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} else {
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target_height = 8 + rnd() % 16
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if upwards
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mountain = 233
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else
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mountain = 223
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}
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while not perform_scroll {
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; let the raster irq do its timing job
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}
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perform_scroll = false
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c64scr.scroll_left_full(true)
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if c64.RASTER & 1
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c64.SPXY[1] ++
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else
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c64.SPXY[1] --
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ubyte yy
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for yy in 0 to active_height-1 {
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c64scr.setcc(39, yy, 32, 2) ; clear top of screen
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}
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c64scr.setcc(39, active_height, mountain, 8) ; mountain edge
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for yy in active_height+1 to 24 {
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c64scr.setcc(39, yy, 160, 8) ; draw mountain
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}
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yy = rnd()
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if yy > 100 {
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; draw a star
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c64scr.setcc(39, yy % (active_height-1), '.', rnd())
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}
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if yy > 200 {
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; draw a tree
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ubyte tree = 30
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ubyte treecolor = 5
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if yy & %01000000 != 0
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tree = 88
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else if yy & %00100000 != 0
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tree = 65
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if rnd() > 130
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treecolor = 13
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c64scr.setcc(39, active_height, tree, treecolor)
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}
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if yy > 235 {
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; draw a camel
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c64scr.setcc(39, active_height, 94, 9)
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}
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}
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}
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}
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spritedata $0f00 {
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; this memory block contains the sprite data
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; it must start on an address aligned to 64 bytes.
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%option force_output ; make sure the data in this block appears in the resulting program
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ubyte[] balloonsprite = [ %00000000,%01111111,%00000000,
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%00000001,%11111111,%11000000,
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%00000011,%11111111,%11100000,
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%00000011,%11100011,%11100000,
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%00000111,%11011100,%11110000,
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%00000111,%11011101,%11110000,
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%00000111,%11011100,%11110000,
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%00000011,%11100011,%11100000,
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%00000011,%11111111,%11100000,
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%00000011,%11111111,%11100000,
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%00000010,%11111111,%10100000,
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%00000001,%01111111,%01000000,
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%00000001,%00111110,%01000000,
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%00000000,%10011100,%10000000,
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%00000000,%10011100,%10000000,
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%00000000,%01001001,%00000000,
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%00000000,%01001001,%00000000,
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%00000000,%00111110,%00000000,
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%00000000,%00111110,%00000000,
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%00000000,%00111110,%00000000,
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%00000000,%00011100,%00000000 ]
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}
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irq {
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ubyte smoothx=7
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sub irq() {
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smoothx = (smoothx-1) & 7
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main.perform_scroll = smoothx==0
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c64.SCROLX = (c64.SCROLX & %11111000) | smoothx
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}
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}
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