Martin Michelsen
40 lines
1.4 KiB
ArmAsm
40 lines
1.4 KiB
ArmAsm
start:
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call process_stick_value
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push esi
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sub esi, 4
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call process_stick_value
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pop esi
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jmp end
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process_stick_value:
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mov ax, [esp + 0x3C] # ax = stick val y
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cwd # dx = FFFF if y < 0 else 0000
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xor dh, dh # dx = 00FF if y < 0 else 0000
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add ax, dx # adjust ax if y negative else don't
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sar ax, 8 # eax = ----Y1Y2
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neg ax
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shl eax, 16 # eax = Y1Y2-----
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mov ax, [esp + 0x3A] # ax = stick val x
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cwd # dx = FFFF if x < 0 else 0000
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xor dh, dh # dx = 00FF if x < 0 else 0000
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add ax, dx # adjust ax if x negative else don't
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sar ax, 8 # eax = Y1Y2X1X2
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# check for deadzone - if either value is outside of deadzone, allow movement
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xor ecx, ecx # ecx = 0
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lea edx, [eax + 0x28] # edx = eax + 0x28 (deadzone range is -0x28 through 0x28)
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cmp dl, 0x50
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cmova ecx, eax # if X2 out of deadzone range, use eax
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mov edx, eax
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bswap edx # dh = Y2
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add dh, 0x28 # dh = Y2 + 0x28
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cmp dh, 0x50
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cmova ecx, eax # if Y2 out of deadzone range, use eax
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mov [esi + 0x18], ecx # set processed stick values
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ret
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.zero 0x56
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end:
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