mirror of
https://github.com/zeldaret/tmc
synced 2026-05-29 08:43:06 -04:00
octorock
aced0bef69
Now the 16x16 tiles are just called tiles and the 8x8 tiles are called subTiles.
54 lines
1.1 KiB
ArmAsm
54 lines
1.1 KiB
ArmAsm
.include "asm/macros.inc"
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.include "constants/constants.inc"
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.syntax unified
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.text
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thumb_func_start CheckBits
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CheckBits: @ 0x08000F10
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ldr r3, _08000F50 @ =ram_CheckBits
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bx r3
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// sum 3 drop probability vectors
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thumb_func_start SumDropProbabilities
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SumDropProbabilities: @ 0x08000F14
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push {r4, r5, r6}
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movs r4, #30 // vector addition for 16 shorts in reverse
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_08000F18:
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ldrsh r5, [r1, r4] // row 1
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ldrsh r6, [r2, r4] // + row 2
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adds r5, r6
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ldrsh r6, [r3, r4] // + row 3
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adds r5, r6
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strh r5, [r0, r4] // store in output
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subs r4, #2
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bpl _08000F18
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pop {r4, r5, r6}
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bx lr
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// sum 3 drop probabilities, clamp to 0, return scalar sum
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thumb_func_start SumDropProbabilities2
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SumDropProbabilities2: @ 0x08000F2C
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push {r4, r5, r6, r7}
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movs r4, #30
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movs r7, #0 // sum
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_08000F32:
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ldrsh r5, [r1, r4] // row 1
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ldrsh r6, [r2, r4] // + row 2
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adds r5, r6
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ldrsh r6, [r3, r4] // + row 3
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adds r5, r6
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bpl positive_drop_chance // clamp to 0
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movs r5, #0
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positive_drop_chance:
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strh r5, [r0, r4] // store in output
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adds r7, r5
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subs r4, #2
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bpl _08000F32
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adds r0, r7, #0 // return sum
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pop {r4, r5, r6, r7}
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bx lr
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.align 2, 0
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_08000F50: .4byte ram_CheckBits
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