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Gambatte for Opendingux (accurate gameboy emulator)

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hi-ban:
Here is the code for a 1.5x scaler Ayla wrote for Ohboy. You can use it in Gambatte if you want.


--- Code: ---/*Ayla's 1.5x Upscaler - 160x144 to 240x216 */
/* Before:
*    a b c d
*    e f g h
*
* After (parenthesis = average):
*    a      (a,b)      b      c      (c,d)      d
*    (a,e)  (a,b,e,f)  (b,f)  (c,g)  (c,d,g,h)  (d,h)
*    e      (e,f)      f      g      (g,h)      h
*/
void ayla_scale15x(uint32_t *to, uint32_t *from){
uint32_t reg1, reg2, reg3, reg4, reg5;
size_t x, y;

for (y=0; y<216/3; y++) {
for (x=0; x<240/6; x++) {
__builtin_prefetch(to+4, 1);

// Read b-a
reg1 = *from;
reg5 = reg1 >> 16;
reg2 = (reg1 & 0xf7de0000) >> 1;
reg1 &= 0xffff;
reg1 |= reg2 + ((reg1 & 0xf7de) << 15);

// Write (a,b)-a
*to = reg1;
reg1 = (reg1 & 0xf7def7de) >> 1;

// Read f-e
reg3 = *(from++ + 160/2);
reg2 = reg3 >> 16;
reg4 = (reg3 & 0xf7de0000) >> 1;
reg3 &= 0xffff;
reg3 |= reg4 + ((reg3 & 0xf7de) << 15);

// Write (e,f)-e
*(to + 2*320/2) = reg3;
reg3 = (reg3 & 0xf7def7de) >> 1;

// Write (a,b,e,f)-(a,e)
*(to++ + 320/2) = reg1 + reg3;

// Read d-c
reg1 = *from;

// Write c-b
reg5 |= (reg1 << 16);
*to = reg5;
reg5 = (reg5 & 0xf7def7de) >> 1;

// Read h-g
reg3 = *(from++ + 160/2);

// Write g-f
reg2 |= (reg3 << 16);
*(to + 2*320/2) = reg2;
reg2 = (reg2 & 0xf7def7de) >> 1;

// Write (c,g)-(b,f)
*(to++ + 320/2) = reg2 + reg5;

// Write d-(c,d)
reg2 = (reg1 & 0xf7def7de) >> 1;
reg1 = (reg1 & 0xffff0000) | ((reg2 + (reg2 >> 16)) & 0xffff);
*to = reg1;
reg1 = (reg1 & 0xf7def7de) >> 1;

// Write h-(g,h)
reg2 = (reg3 & 0xf7def7de) >> 1;
reg3 = (reg3 & 0xffff0000) | ((reg2 + (reg2 >> 16)) & 0xffff);
*(to + 2*320/2) = reg3;
reg3 = ((reg3 & 0xf7def7de) >> 1);

// Write (d,h)-(c,d,g,h)
*(to++ + 320/2) = reg1 + reg3;
}

to += 2*360/2;
from += 160/2;
}
}

--- End code ---

zear:

--- Quote from: abhoriel on February 12, 2012, 12:02:52 PM ---
--- Quote from: zear on February 12, 2012, 03:25:53 AM ---It segfaults for me on OD.

--- End quote ---

What version of OD are you using? I'm still using prerelease 2. I should probably test it on a newer build :)

--- End quote ---
I'm using a newer version than the latest preview release. My build should be close to the final one.

qbertaddict:
Im using pre-release 2

abhoriel:
ok, so it works fine in prerelease 2, but not in very new OD builds. I'll compile a newer OD and see if I can get this issue fixed.

hi-ban, thanks, I didn't know about that scaler :) I'll add it. As it retains the original aspect ratio, it would be a good one to have.

elrichard:
This is probably the ultimate GB/GBC emulator for OD, I tested it on prerelease 2 and works flawlessly. I have to give it a try with some other games to see if performance is affected. Great job guys!

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