Alien 8: Routine at B804

B804: Place Scene Objects

Used by the routine at GameOver.

Places the objects of an ending scene in the table of objects, starting at PlayerBottomObject. Each is described by five bytes: the sprite number, the flags, the colour, the pixel x position and the pixel y position. The list ends with a sprite number of zero.

Input
DE	Address of the list of objects

Start at the first object.

PlaceSceneObjects

B804

LD IY,$5B88

Point IY at PlayerBottomObject.

B808

LD BC,$0020

Set the size of an object record to 20.

Copy the next object, or return at the terminator.

PlaceSceneObjects_NextObject

B80B

LD A,(DE)

Fetch the sprite number.

B80C

INC DE

Move on.

B80D

AND A

Return if the list has ended.

B80E

RET Z

B80F

LD (IY+$00),A

Set the sprite number of the object.

B812

LD A,(DE)

Fetch the flags.

B813

INC DE

Move on.

B814

LD (IY+$07),A

Set the flags of the object.

B817

LD A,(DE)

Fetch the colour.

B818

INC DE

Move on.

B819

LD (IY+$10),A

Set the colour of the object.

B81C

LD A,(DE)

Fetch the pixel x position.

B81D

INC DE

Move on.

B81E

LD (IY+$1A),A

Set the pixel x position of the object.

B821

LD A,(DE)

Fetch the pixel y position.

B822

INC DE

Move on.

B823

LD (IY+$1B),A

Set the pixel y position of the object.

B826

ADD IY,BC

Move on to the next object.

B828

JR PlaceSceneObjects_NextObject

Jump to PlaceSceneObjects_NextObject.