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Routines |
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Used by the routines at CALC_2D_INFO and CALC_PIXEL_XY_AND_RENDER.
The graphic (+0) indexes GRAPHICS for the sprite. A sprite whose first byte is 0 draws nothing: the routine then drops its own return address, so its RET leaves its caller too. Otherwise it jumps to VFLIP_SPRITE_DATA, which turns the sprite's data to match the object's flags and returns to the caller with DE on the width byte. As Knight Lore's flip_sprite.
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| FLIP_SPRITE | CFFE | LD L,(IX+$00) | DE = the sprite, from the graphic table | |||||||||
| D001 | LD H,$00 | |||||||||||
| D003 | ADD HL,HL | |||||||||||
| D004 | LD BC,GRAPHICS | |||||||||||
| D007 | ADD HL,BC | |||||||||||
| D008 | LD E,(HL) | |||||||||||
| D009 | INC HL | |||||||||||
| D00A | LD D,(HL) | |||||||||||
| D00B | LD A,(DE) | A real sprite: turn it, and return from there | ||||||||||
| D00C | AND A | |||||||||||
| D00D | JP NZ,VFLIP_SPRITE_DATA | |||||||||||
| D010 | INC SP | None: return from the caller as well | ||||||||||
| D011 | INC SP | |||||||||||
| D012 | RET | |||||||||||
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