2015-12-16 18:04:57 -08:00
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// bomb tornado
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// originally written by RainingChain in Lua
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// rewritten in assembly by notwa
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[global_context]: 0x803E6B20
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[link_actor]: 0x803FFDB0
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[actorlist_offset]: 0x1CB0
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[actorlist_dead_space]: 0x4
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[actor_x]: 0x24
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[actor_y]: 0x28
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[actor_z]: 0x2C
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[actor_prev]: 0x128
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[actor_next]: 0x12C
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[actor_bomb_timer]: 0x1F1
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[at_bomb]: 0x0009
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[rotate_amount]: 0x3E567750 // pi/15
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// F12 = input (single), F0 = output (single), F4 = output (double)
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[sinf]: 0x80088350
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[cosf]: 0x80091F40
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main:
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2015-12-17 22:59:32 -08:00
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push 4, s1, s3, s4, ra
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2015-12-17 08:52:48 -08:00
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// s1: current actor ptr
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// s3: current actor type ptr
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// s4: current actor type index
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2015-12-16 18:04:57 -08:00
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li t0, @global_context
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addi s3, t0, @actorlist_offset
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li s4, 0
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// update rotations
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la t0, rotations
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li t2, @rotate_amount
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li t9, 0
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rotate_loop:
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lw t1, 0(t0)
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mtc1 t1, F0
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mtc1 t2, F1
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add.s F0, F0, F1
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mfc1 t1, F0
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sw t1, 0(t0)
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addi t0, t0, 4
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addi t9, t9, 1
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li at, 6
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bne t9, at, rotate_loop
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nop
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la t0, rotations
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sw t0, current_rotation
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typeloop:
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addi s3, s3, 4 // skip over count
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lw s1, 0(s3)
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beq s1, r0, continue
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listloop:
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mov a0, s1
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bal process_actor
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lw s1, @actor_next(s1)
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bne s1, r0, listloop
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nop
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continue:
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addi s3, s3, 4
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addi s4, s4, 1
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li t0, 12
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bne s4, t0, typeloop
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addi s3, s3, @actorlist_dead_space
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2015-12-17 22:59:32 -08:00
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jpop 4, s1, s3, s4, ra
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2015-12-16 18:04:57 -08:00
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process_actor: // args: a0. returns nothing.
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// TODO: ignore bomb explosions, they share the same type
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2015-12-17 22:59:32 -08:00
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push 4, s0, s1, ra
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2015-12-17 08:52:48 -08:00
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// s0: result of sin
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// s1: result of cos
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2015-12-16 18:04:57 -08:00
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lh t0, 0(a0)
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subiu t0, t0, @at_bomb
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bne t0, r0, process_actor_return
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nop
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li t0, 0x45
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sb t0, @actor_bomb_timer(a0)
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lw t5, current_rotation
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lw t5, 0(t5)
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jal @sinf
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mtc1 t5, F12
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mfc1 s0, F0
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lw t5, current_rotation
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lw t5, 0(t5)
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jal @cosf
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mtc1 t5, F12
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mfc1 s1, F0
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li t1, @link_actor
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lw t2, @actor_x(t1)
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lw t3, @actor_y(t1)
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lw t4, @actor_z(t1)
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li t0, 0x42960000 // 75
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mtc1 t0, F2
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// process X
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mtc1 s0, F0
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mtc1 t2, F1
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mul.s F0, F0, F2
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add.s F0, F0, F1
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mfc1 t2, F0
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// process Z
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mtc1 s1, F0
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mtc1 t4, F1
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mul.s F0, F0, F2
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add.s F0, F0, F1
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mfc1 t4, F0
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sw t2, @actor_x(a0)
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sw t3, @actor_y(a0)
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sw t4, @actor_z(a0)
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lw t5, current_rotation
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addi t5, t5, 4
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sw t5, current_rotation
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process_actor_return:
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2015-12-17 22:59:32 -08:00
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jpop 4, s0, s1, ra
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2015-12-16 18:04:57 -08:00
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rotations:
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.word 0x00000000 // pi*0/6
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.word 0x40060a92 // pi*4/6
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.word 0x40860a92 // pi*8/6
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.word 0x40c90fdb // pi*12/6
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.word 0x41060a92 // pi*16/6
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.word 0x41278d36 // pi*20/6
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current_rotation:
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.word 0
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