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Routines |
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Used by the routines at Process_Enemy_Entity and Spawn_Primary_Wave_Enemies.
Reads the sprite type and screen address from the entity record at HL, looks up the sprite pixel data in Sprite_Pixel_Data_Table, then XOR-blits eight pixel rows onto the screen. Falls through to Draw_Spawned_Entity_Attribute to write the entity's attribute colour from the colour cycle table. Called immediately after a new entity is written to the entity list.
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| Draw_Spawned_Entity | CC81 | LD A,(HL) | Read the entity sprite type into A and the screen address into DE. | |
| CC82 | INC HL | |||
| CC83 | LD E,(HL) | |||
| CC84 | INC HL | |||
| CC85 | LD D,(HL) | |||
| CC86 | INC HL | |||
| CC87 | LD B,H | Stash the entity record pointer in BC and double the sprite type to form the lookup word offset. | ||
| CC88 | LD C,L | |||
| CC89 | PUSH BC | |||
| CC8A | ADD A,A | |||
| CC8B | LD C,A | |||
| CC8C | LD B,$00 | Index the sprite data table at Sprite_Pixel_Data_Table and restore the entity record pointer from the stack. | ||
| CC8E | LD HL,$C60C | |||
| CC91 | ADD HL,BC | |||
| CC92 | POP BC | |||
| CC93 | LD A,(HL) | Load the sprite pixel data address into HL. | ||
| CC94 | INC HL | |||
| CC95 | LD H,(HL) | |||
| CC96 | LD L,A | |||
| CC97 | LD A,(DE) | XOR-blit eight pixel rows of sprite data onto the screen. | ||
| CC98 | XOR (HL) | |||
| CC99 | LD (DE),A | |||
| CC9A | INC HL | |||
| CC9B | INC D | |||
| CC9C | LD A,(DE) | |||
| CC9D | XOR (HL) | |||
| CC9E | LD (DE),A | |||
| CC9F | INC HL | |||
| CCA0 | INC D | |||
| CCA1 | LD A,(DE) | |||
| CCA2 | XOR (HL) | |||
| CCA3 | LD (DE),A | |||
| CCA4 | INC HL | |||
| CCA5 | INC D | |||
| CCA6 | LD A,(DE) | |||
| CCA7 | XOR (HL) | |||
| CCA8 | LD (DE),A | |||
| CCA9 | INC HL | |||
| CCAA | INC D | |||
| CCAB | LD A,(DE) | |||
| CCAC | XOR (HL) | |||
| CCAD | LD (DE),A | |||
| CCAE | INC HL | |||
| CCAF | INC D | |||
| CCB0 | LD A,(DE) | |||
| CCB1 | XOR (HL) | |||
| CCB2 | LD (DE),A | |||
| CCB3 | INC HL | |||
| CCB4 | INC D | |||
| CCB5 | LD A,(DE) | |||
| CCB6 | XOR (HL) | |||
| CCB7 | LD (DE),A | |||
| CCB8 | INC HL | |||
| CCB9 | INC D | |||
| CCBA | LD A,(DE) | |||
| CCBB | XOR (HL) | |||
| CCBC | LD (DE),A | |||
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This entry point is used by the routine at Primary_Enemy_Entity_Handler.
Write the entity's current colour from the colour cycle table to the attribute cell at the entity's screen position.
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| Draw_Spawned_Entity_Attribute | CCBD | LD A,(BC) | Read the low byte of the attribute cell address from the entity record into L. | |
| CCBE | INC BC | |||
| CCBF | LD L,A | |||
| CCC0 | LD A,(BC) | |||
| CCC1 | LD H,A | Form the attribute cell address high byte in H. | ||
| CCC2 | LD DE,($C4E5) | Load the current colour byte from the colour cycle table at Colour_Cycle_Table_Pointer and write it to the attribute cell. | ||
| CCC6 | DEC DE | |||
| CCC7 | LD A,(DE) | |||
| CCC8 | LD (HL),A | |||
| CCC9 | LD H,B | Write the colour, restore the entity record pointer, advance past two fields, and return. | ||
| CCCA | LD L,C | |||
| CCCB | INC HL | |||
| CCCC | INC HL | |||
| CCCD | RET | Return. | ||
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