|
Routines |
| Prev: 63E9 | Up: Map | Next: 6456 |
|
Used by the routine at Draw_Room_Tile.
Draws multiple character rows from the room buffer to the screen buffer. After all rows are drawn, prints the HUD header if it hasn't been drawn yet, and applies random colours to the bottom ground strip.
|
||||||||||
| Draw_Room_Rows_Loop | 6438 | PUSH BC | Stash the row counter and room buffer pointer on the stack. | |||||||
| 6439 | PUSH HL | |||||||||
| 643A | CALL Draw_Room_Row | Call Draw_Room_Row to draw a single character row. | ||||||||
| 643D | POP HL | Restore the room buffer pointer and row counter from the stack. | ||||||||
| 643E | POP BC | |||||||||
|
Advance the room buffer pointer to the next character row. Each row is 20 bytes wide; if adding 20 to L overflows, advance H by 08 to move into the next screen third.
|
||||||||||
| 643F | LD A,$20 | Add 20 to L. | ||||||||
| 6441 | ADD A,L | |||||||||
| 6442 | LD L,A | |||||||||
| 6443 | OR A | Jump to Draw_Room_Rows_Next if there was no overflow. | ||||||||
| 6444 | JR NZ,Draw_Room_Rows_Next | |||||||||
| 6446 | LD A,$08 | Add 08 to H. | ||||||||
| 6448 | ADD A,H | |||||||||
| 6449 | LD H,A | |||||||||
| Draw_Room_Rows_Next | 644A | DJNZ Draw_Room_Rows_Loop | Decrease the row counter by one and loop back to Draw_Room_Rows_Loop until all rows have been drawn. | |||||||
|
Print the HUD header if the screen hasn't been fully initialised yet.
|
||||||||||
| 644C | LD A,($5FA1) | Call Print_HUD_Header if *Screen_Initialised_Flag is unset (HUD header not yet drawn). | ||||||||
| 644F | OR A | |||||||||
| 6450 | CALL Z,Print_HUD_Header | |||||||||
| 6453 | JP Colour_Ground_Strip | Jump to Colour_Ground_Strip. | ||||||||
| Prev: 63E9 | Up: Map | Next: 6456 |