mirror of
https://github.com/arabine/open-story-teller.git
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74 lines
2.4 KiB
Text
74 lines
2.4 KiB
Text
; Generic media choice manager
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.media:
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; Les adresses des différents medias sont dans la stack
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; Arguments:
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; r0: address d'une structure de type "media choice"
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; Local:
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; t0: current media address
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; t1: increment 4
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; t3: address of the first element in the choice array
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; t4: address of the last element in the choice array
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; t5: where to jump when OK button is pressed
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mov t3, r0 ; copie de R0 pour travailler dessus
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mov t2, r0 ; sauvegarde de R0
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load r0, @t3, 4 ; Le premier élément est le nombre de choix possibles, ex: r0 = 12
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lcons t1, 4
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mul r0, t1 ; on calcule l'offset: r0 = nb_elements * 4 = 48
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mov t4, t3 ; t4 = t3
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add t4, r0 ; t4 pointe maintenant sur le dernier élément de la structure
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add t3, t1 ; t3 pointe maintenant sur le premier élément
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mov t0, t3 ; on commence sur le premier élément
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.media_loop:
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; --------- We call a media transition node
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load r0, @t0, 4 ; Get the address located at memory T0
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call r0 ; call subroutine
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; Return argument in R0: the address of the node to call whe OK is pressed
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mov t5, r0 ; save it
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; wait for event
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lcons r0, 0b111 ; mask for OK, previous and next buttons
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syscall 2
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; Event is stored in R0
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; ----- Test if event is OK button
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lcons r1, 1 ; mask for OK button
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and r1, r0 ; r1 = r1 AND r0
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skipz r1 ; not OK, skip jump
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jump .media_wait_event
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; test previous event
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lcons r1, 2 ; mask for previous button
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and r1, r0 ; r1 = r1 AND r0
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skipz r1 ; not OK, skip jump
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jump .media_previous
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; all other events mean: next node
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eq r0, t0, t4 ; t4 est le dernier élément
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skipz r0 ; zéro, on peut incrémenter l'adresse
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jump .media_set_first
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add t0, t1 ; t0 += 4
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jump .media_loop
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.media_set_first: ; on reboucle sur le premier élément de la structure
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mov t0, t3
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jump .media_loop
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.media_previous:
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eq r0, t0, t3 ; on teste si on est au premier élément
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skipz r0 ; zéro, on peut décrémenter l'adresse
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jump .media_set_last
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sub t0, t1 ; t0 += 4
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jump .media_loop
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.media_set_last: ; on reboucle sur le dernier élément de la structure
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mov t0, t4
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jump .media_loop
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.media_wait_event:
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call t5 ; jump to the node
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lcons r0, 0b10000100001 ; mask for end of audio, Ok, and home buttons
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syscall 2 ; wait for event (OK, home or end of audio), return to choice loop
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jump .media_loop |