mirror of
https://github.com/arabine/open-story-teller.git
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48 lines
1.3 KiB
NASM
48 lines
1.3 KiB
NASM
; 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: loop counter
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; t1: increment 1
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; t2: increment 4
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; t3: current media address
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; t4: where to jump when OK button is pressed
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; t5: address of the "choice" array
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mov t5, r0 ; we save R0
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.media_loop_start:
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load t0, @t5, 4 ; Le premier élément est le nombre de choix possibles, t0 = 3 (exemple)
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lcons t1, 1
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lcons t2, 4
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mov t3, t5
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.media_loop:
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add t3, t2 ; @++
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; --------- We call a media transition node
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load r0, @t3, 4 ; r0 = content in ram at address in T3
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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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; save it in t4
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mov t4, r0
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; wait for event (OK or wheel)
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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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jumpr t4 ; we do not plan to return here, so a jump is enough
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; all other events mean: next node
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sub t0, t1 ; i--
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skipnz t0 ; if (r0) goto start_loop;
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jump .media_loop_start
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jump .media_loop
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