; Tests the pathological behavior when 8 sprites are on a scanline
; and the one just after the 8th is not on the scanline. After that,
; the PPU interprets different bytes of each following sprite as
; its Y coordinate. 1 2 3 4 5 6 7 8 9 10 11 12 13 14: If 1-8 are
; on the same scanline, 9 isn't, then the second byte of 10, the
; third byte of 11, fourth byte of 12, first byte of 13, second byte
; of 14, etc. are treated as those sprites' Y coordinates for the
; purpose of setting the overflow flag. This search continues until
; all sprites have been scanned or one of the (erroneously interpreted)
; Y coordinates places the sprite within the scanline.

     .include "prefix.a"

test_name:
     .db  "SPRITE OVERFLOW OBSCURE",0
     .code

reset:
     jsr  begin_sprite_overflow_tests
     
     jsr  clear_sprite_table
     lda  #2;) Checks that second byte of sprite #10 is treated as its Y 
     ldx  #128
     stx  sprites + 0
     stx  sprites + 4
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     ; leave sprites + 32 off screen
     stx  sprites + 37
     ldx  #$18
     jsr  sprites_should_overflow
     
     jsr  clear_sprite_table
     lda  #3;) Checks that third byte of sprite #11 is treated as its Y 
     ldx  #128
     stx  sprites + 0
     stx  sprites + 4
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     ; leave sprites + 32 off screen
     ; leave sprites + 37 off screen
     stx  sprites + 42
     ldx  #$18
     jsr  sprites_should_overflow
     
     jsr  clear_sprite_table
     lda  #4;) Checks that fourth byte of sprite #12 is treated as its Y 
     ldx  #128
     stx  sprites + 0
     stx  sprites + 4
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     ; leave sprites + 32 off screen
     ; leave sprites + 37 off screen
     ; leave sprites + 42 off screen
     stx  sprites + 47
     ldx  #$18
     jsr  sprites_should_overflow
     
     jsr  clear_sprite_table
     lda  #5;) Checks that first byte of sprite #13 is treated as its Y 
     ldx  #128
     stx  sprites + 0
     stx  sprites + 4
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     ; leave sprites + 32 off screen
     ; leave sprites + 37 off screen
     ; leave sprites + 42 off screen
     ; leave sprites + 47 off screen
     stx  sprites + 48
     ldx  #$18
     jsr  sprites_should_overflow
     
     jsr  clear_sprite_table
     lda  #6;) Checks that second byte of sprite #14 is treated as its Y 
     ldx  #128
     stx  sprites + 0
     stx  sprites + 4
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     ; leave sprites + 32 off screen
     ; leave sprites + 37 off screen
     ; leave sprites + 42 off screen
     ; leave sprites + 47 off screen
     ; leave sprites + 48 off screen
     stx  sprites + 53
     ldx  #$18
     jsr  sprites_should_overflow
     
     jsr  clear_sprite_table
     lda  #7;) Checks that search stops at the last (64th) sprite
     ldx  #128
     stx  sprites + 1    ; if search erroneously wraps,
     stx  sprites + 2    ; it will grab one of these
     stx  sprites + 3
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     stx  sprites + 32
     stx  sprites + 36
     ldx  #$18
     jsr  sprites_should_not_overflow
     
     jsr  clear_sprite_table
     lda  #8;) Same as test #2 but using a different range of sprites
     ldx  #128
     stx  sprites + 4
     stx  sprites + 8
     stx  sprites + 12
     stx  sprites + 16
     stx  sprites + 20
     stx  sprites + 24
     stx  sprites + 28
     stx  sprites + 32
     ; leave sprites + 36 off screen
     stx  sprites + 41
     ldx  #$18
     jsr  sprites_should_overflow
     
     jmp  tests_passed