river-raid: Routine at 6EC8

6EC8: Process and render all active explosions

Iterates through the explosions set at exploding_fragments via pointer exploding_fragments_ptr. Each explosion has 6 animation frames before being removed. Adjusts Y position based on scroll speed. Entry format: [X_pos, Y_offset, frame_counter] where frame_counter bits 0-6 = frame (1-6), bit 7 = erase flag Frame 1,5: small explosion (ld_sprite_explosion_f1) Frame 2,4: medium explosion (ld_sprite_explosion_f2) Frame 3: large explosion (ld_sprite_explosion_f3) Frame 6: erase explosion (ld_sprite_explosion_erasure) then remove entry
render_explosions	6EC8	LD HL,($5F62)	Load 3-byte entry from set: C=X, B=Y offset, D=frame. Advance pointer exploding_fragments_ptr.
	6ECB	LD C,(HL)
	6ECC	INC HL
	6ECD	LD B,(HL)
	6ECE	INC HL
	6ECF	LD D,(HL)
	6ED0	INC HL
	6ED1	LD ($5F62),HL
	6ED4	LD A,C	Skip empty entries, continue to next.
	6ED5	CP $00
	6ED7	JP Z,render_explosions
	6EDA	CP $FF	If end-of-set marker, jump to reset_explosions_pointer to reset pointer.
	6EDC	JP Z,reset_explosions_pointer
	6EDF	LD A,($5F64)	Add scroll speed (state_speed) to Y offset, store back.
	6EE2	ADD A,B
	6EE3	DEC HL
	6EE4	DEC HL
	6EE5	LD (HL),A
	6EE6	LD A,D	Extract frame number (bits 0-6), increment. If frame == 7, entry complete.
	6EE7	AND $7F
	6EE9	INC A
	6EEA	CP $07
	6EEC	JP Z,remove_explosion_entry
	6EEF	LD A,D	Increment frame counter and store back.
	6EF0	INC A
	6EF1	INC HL
	6EF2	LD (HL),A
	6EF3	LD A,B	Check if Y position is off-screen (AND $88 == $88). Skip if so.
	6EF4	AND $88
	6EF6	CP $88
	6EF8	JP Z,render_explosions
	6EFB	LD A,B	Check if Y position is off-screen (AND $90 == $90). Skip if so.
	6EFC	AND $90
	6EFE	CP $90
	6F00	JP Z,render_explosions
	6F03	LD A,(HL)	Get frame number. Load sprite for frame 1.
	6F04	AND $7F
	6F06	CP $01
	6F08	CALL Z,ld_sprite_explosion_f1	Load sprite for frame 2.
	6F0B	CP $02	Load sprite for frame 2.
	6F0D	CALL Z,ld_sprite_explosion_f2	Load sprite for frame 3.
	6F10	CP $03	Load sprite for frame 3.
	6F12	CALL Z,ld_sprite_explosion_f3	Load sprite for frame 4 (same as 2).
	6F15	CP $04	Load sprite for frame 4 (same as 2).
	6F17	CALL Z,ld_sprite_explosion_f2	Load sprite for frame 5 (same as 1).
	6F1A	CP $05	Load sprite for frame 5 (same as 1).
	6F1C	CALL Z,ld_sprite_explosion_f1	Load erasure sprite for frame 6.
	6F1F	CP $06
	6F21	CALL Z,ld_sprite_explosion_erasure
	6F24	LD A,(HL)	Set up sprite rendering: store sprite pointer, set collision mode to none, configure rendering parameters.
	6F25	LD HL,$82C5
	6F28	LD ($8B0E),HL
	6F2B	LD ($8B10),DE
	6F2F	LD D,A
	6F30	LD A,$00
	6F32	LD ($5EF5),A
	6F35	LD A,$02
	6F37	LD ($8B1A),A
	6F3A	LD A,D
	6F3B	LD DE,$080C
	6F3E	LD ($8B0A),BC
	6F42	LD ($8B0C),BC
	6F46	LD BC,$0000	Check bit 7 of frame. If set, skip first render call.
	6F49	BIT 7,A
	6F4B	JP NZ,render_explosions_next
	6F4E	PUSH DE
	6F4F	PUSH BC
	6F50	PUSH AF
	6F51	PUSH HL
	6F52	LD A,$02	Call first sprite rendering pass.
	6F54	CALL set_sprite_attributes	Call first sprite rendering pass.
	6F57	POP HL	Restore registers from stack.
	6F58	POP AF
	6F59	POP BC
	6F5A	POP DE
render_explosions_next	6F5B	LD A,$02	Call second sprite rendering pass, loop to next entry.
	6F5D	CALL render_object_entry
	6F60	JP render_explosions