Apple-2-SW/prog8
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added cx16 sprites.move , movex and movey routines to move sprite by deltas

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Irmen de Jong 2023-11-30 20:49:47 +01:00
parent afe521b0c9
commit b58a3ba1bb
2 changed files with 31 additions and 0 deletions
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27
compiler/res/prog8lib/cx16/sprites.p8
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@ -81,6 +81,33 @@ sprites {
cx16.vpoke(1, sprite_reg+1, msb(ypos))
}
sub move(ubyte spritenum, word dx, word dy) {
; move a sprite based on its current position
sprite_reg = VERA_SPRITEREGS + 2 + spritenum*$0008
cx16.r1 = mkword(cx16.vpeek(1, sprite_reg+1), cx16.vpeek(1, sprite_reg)) as word + dx
cx16.r2 = mkword(cx16.vpeek(1, sprite_reg+3), cx16.vpeek(1, sprite_reg+2)) as word + dy
cx16.vpoke(1, sprite_reg, cx16.r1L)
cx16.vpoke(1, sprite_reg+1, cx16.r1H)
cx16.vpoke(1, sprite_reg+2, cx16.r2L)
cx16.vpoke(1, sprite_reg+3, cx16.r2H)
}
sub movex(ubyte spritenum, word dx) {
; move a sprite horizontally based on its current position
sprite_reg = VERA_SPRITEREGS + 2 + spritenum*$0008
cx16.r1 = mkword(cx16.vpeek(1, sprite_reg+1), cx16.vpeek(1, sprite_reg)) as word + dx
cx16.vpoke(1, sprite_reg, cx16.r1L)
cx16.vpoke(1, sprite_reg+1, cx16.r1H)
}
sub movey(ubyte spritenum, word dy) {
; move a sprite vertically based on its current position
sprite_reg = VERA_SPRITEREGS + 4 + spritenum*$0008
cx16.r1 = mkword(cx16.vpeek(1, sprite_reg+1), cx16.vpeek(1, sprite_reg)) as word + dy
cx16.vpoke(1, sprite_reg, cx16.r1L)
cx16.vpoke(1, sprite_reg+1, cx16.r1H)
}
sub getx(ubyte spritenum) -> word {
sprite_reg = VERA_SPRITEREGS + 2 + spritenum*$0008
return mkword(cx16.vpeek(1, sprite_reg+1), cx16.vpeek(1, sprite_reg)) as word

4
examples/cx16/sprites/dragon.p8
View File

@ -29,6 +29,9 @@ main {
word ypos
bool flippedx = false
sprites.pos(1, 0, 100)
sprites.pos(2, 100, 300)
repeat {
if flippedx
xpos -= 2
@ -49,6 +52,7 @@ main {
txt.print(" ")
sys.waitvsync()
; we set absolute sprite position, rather than the relative move() routines
sprites.pos(1, xpos, ypos)
sprites.pos(2, xpos, ypos+64)
sprites.flipx(1, flippedx)