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Two instructions. Store ESI, at one. And use it at the other

 
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LykanthricAura
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Joined: 17 May 2010
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Location: India
PostPosted: Mon Feb 23, 2015 4:43 pm    Post subject: Two instructions. Store ESI, at one. And use it at the other Reply with quote
@Admin. Did not know to what to name the topic. Edit it if and as you wish.

Game : Fallout 3 GotY Edition.

I have two different instruction which are called when I select a weapon from the weapons menu in the game. I want to set the 'Weapon Condtion' to 100%.

This instruction is for the HUD/Display only.

Code:
Fallout3.exe+24625A - - fstp dword ptr [Fallout3.exe+B6ACA4]


And the value of ESI at this instant is the MAX weapon condtion of that particular weapon.

And this one is for the actual values for the structure of that weapon.
Code:
Fallout3.exe+1D38D - - fld dword ptr [esi+0C]


They are both called when I select that weapon.

I want to get the value of ESI from the first instruction. Which is hex turn it the equivalent float. That is .. hex 96 is decimal 150. But I need float 150 and store it in [esi+0C] of the second instruction.

Can this even be done?
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Zanzer
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PostPosted: Mon Feb 23, 2015 7:51 pm    Post subject: This post has 1 review(s) Reply with quote
Did you leave off one of the instructions?

According to the code you posted, the first value is a static pointer.

In the second code block, you can simply use that same address.

Code:
fld dword ptr [Fallout3.exe+B6ACA4] // static address
fst dword ptr [esi+0C] // don't pop it
// ... normal application flow


No conversion from int to float required.

By the way, converting from int to float is easy:
Code:
fild [integer.address]
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LykanthricAura
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PostPosted: Tue Feb 24, 2015 4:26 am    Post subject: Reply with quote
Thanks. It seems to be working.

Seems it was fairly easy. I should read up more on the floating point operations. I m not very well versed with fld and fst and such.
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