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Routines |
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Used by the routines at CheckScoreAwardLife and PlayerDeath.
Entry point for wave staging. Resets the entity list write pointer to Entity_List_Base and writes a terminator. If Active_Enemy_Count is non-zero the current wave set is re-populated (Stage_Next_Wave_Populate); otherwise a fresh wave is loaded: enemy parameters are cleared, the next entry in the wave definition table (Wave_Definition_Pointer) is read, the display is reinitialised via Clear_Screen_And_Render_HUD, and the main game loop is entered via Main_Game_Loop with the playfield entity handler 52834 in place.
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| Stage_Next_Wave | 53836 | LD HL,24832 | Reset the entity list write pointer to Entity_List_Base. | |
| 53839 | LD (50441),HL | Write the entity list terminator routine address 53668 and the 255 sentinel; store the updated write pointer at Entity_List_Write_Pointer. | ||
| 53842 | LD DE,53668 | |||
| 53845 | LD (HL),E | |||
| 53846 | INC HL | |||
| 53847 | LD (HL),D | |||
| 53848 | INC HL | |||
| 53849 | LD (HL),255 | |||
| 53851 | LD A,(50204) | Check whether the wave counter at Active_Enemy_Count is non-zero; if so, jump to Stage_Next_Wave_Populate to re-populate the current wave set. | ||
| 53854 | AND A | |||
| 53855 | JR NZ,Stage_Next_Wave_Populate | |||
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New wave: clear enemy parameters, read the next wave definition entry, and reinitialise the display.
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| 53857 | LD HL,50211 | Clear the enemy parameter block at Wave_Enemy_Count (12 bytes) ready for the incoming wave. | ||
| 53860 | LD DE,50212 | |||
| 53863 | LD (HL),0 | |||
| 53865 | LD BC,12 | |||
| 53868 | LDIR | |||
| 53870 | LD HL,(50185) | Read the new wave number from Wave_Definition_Pointer into WaveNumber, then reinitialise the display via Clear_Screen_And_Render_HUD. | ||
| 53873 | LD A,(HL) | |||
| 53874 | LD (50184),A | |||
| 53877 | CALL Clear_Screen_And_Render_HUD | |||
| 53880 | LD HL,(50185) | Advance the wave definition pointer in Wave_Definition_Pointer past the current entry via DispatchWordFromHL. | ||
| 53883 | INC HL | |||
| 53884 | CALL DispatchWordFromHL | |||
| 53887 | LD (50185),HL | Store the updated wave definition pointer back to Wave_Definition_Pointer. | ||
| Stage_Next_Wave_Activate | 53890 | LD HL,24576 | Point the playfield write pointer (Playfield_Entity_List_Pointer) to Entity_List and write the playfield entity handler address 52834 to the entity list. | |
| 53893 | LD DE,52834 | |||
| 53896 | LD (50385),HL | |||
| 53899 | LD (HL),E | Write the 255 end-of-list sentinel after the handler address. | ||
| 53900 | INC HL | |||
| 53901 | LD (HL),D | |||
| 53902 | INC HL | |||
| 53903 | LD (HL),255 | |||
| 53905 | LD HL,50398 | Set the wave active flag at Wave_Active_Flag to 1 and jump to the main game loop at Main_Game_Loop. | ||
| 53908 | LD (HL),1 | |||
| 53910 | JP Main_Game_Loop | |||
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Re-populate: clear the wave counter, redraw the HUD, and spawn all enemy types for the current wave before restarting the game loop.
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| Stage_Next_Wave_Populate | 53913 | XOR A | Clear the wave counter at Active_Enemy_Count and redraw the HUD via RenderHUD. | |
| 53914 | LD (50204),A | |||
| 53917 | CALL RenderHUD | |||
| 53920 | LD HL,50211 | Call Spawn_Primary_Wave_Enemies using Wave_Enemy_Count. | ||
| 53923 | CALL Spawn_Primary_Wave_Enemies | |||
| 53926 | CALL Spawn_Wave_Enemies_Class2 | Spawn the secondary wave enemies via Spawn_Wave_Enemies_Class2. | ||
| 53929 | CALL Spawn_Wave_Enemies | Run the entity update pass via Spawn_Wave_Enemies. | ||
| 53932 | CALL Spawn_Horizontal_Wave_Enemies | Call Spawn_Horizontal_Wave_Enemies. | ||
| 53935 | CALL Evaluate_And_Spawn_Tracked_Enemies | Call Evaluate_And_Spawn_Tracked_Enemies. | ||
| 53938 | CALL Apply_Wave_Border_Colour | Call Apply_Wave_Border_Colour. | ||
| 53941 | CALL Spawn_Wall_Bouncing_Enemies | Call Spawn_Wall_Bouncing_Enemies. | ||
| 53944 | XOR A | Clear A and restart the playfield via Stage_Next_Wave_Activate. | ||
| 53945 | JP Stage_Next_Wave_Activate | |||
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