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bootsector_
Joined: 25 Feb 2008
Posts: 15
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 Posted: Mon Feb 25, 2008 1:26 am Post subject: PSMS Reloaded v0.1 - Problems with GsKit/CLUT |
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Hi folks!
I'm trying to bring back PSMS 1.2 (Sega Master System Emulator for PS2) to life again by converting it to GsKit and using some ideas/code I got from FCEUltra for PS2 by ragnarok2040.
It's already loading ROMs from every device (MC/USB/MASS/HDD...) and it's running at full speed with sound. However, as I'm a newbie with all this GsKit/PS2 stuff, I'm facing problems with the PS2 CLUT. This is leading me to a screen like this:
instead of this:
As you guys can see, colors are all messed up. I have tried a couple of things but with no success. Here are some fragments of pertinent code (you can download full sources and a working binary at the end of this post as well):
bitmap and clut data variables:
| Code: | u8 bitmap_data[256 * 256] __attribute__((aligned(128))) __attribute__ ((section (".bss"))); // SMS display is only 256x192, extra data is padding
u16 clut[256] __attribute__((aligned(16))) __attribute__ ((section (".bss"))); |
Setting up SMS screen texture:
| Code: | void setupSMSTexture(void) {
SMSTEX.PSM = GS_PSM_T8;
SMSTEX.ClutPSM = GS_PSM_CT16;
SMSTEX.Clut = (u32 *)clut;
SMSTEX.VramClut = gsKit_vram_alloc(gsGlobal, gsKit_texture_size(16, 16, SMSTEX.ClutPSM), GSKIT_ALLOC_USERBUFFER);
SMSTEX.Width = 256;
SMSTEX.Height = 256;
SMSTEX.TBW = 4; //256;
SMSTEX.Vram = gsKit_vram_alloc(gsGlobal, gsKit_texture_size(SMSTEX.Width, SMSTEX.Height, SMSTEX.PSM), GSKIT_ALLOC_USERBUFFER);
} |
Update video function:
| Code: | void update_video()
{
SMSTEX.Mem = (u32 *)bitmap_data;
gsKit_texture_upload(gsGlobal, &SMSTEX);
/* vsync and flip buffer */
gsKit_sync_flip(gsGlobal);
/* execute render queue */
gsKit_queue_exec(gsGlobal);
} |
Palette building routine (this is called with indexes between 0 and 31):
| Code: | void palette_sync(int index)
{
int r, g, b;
if(IS_GG)
{
r = ((vdp.cram[(index << 1) | 0] >> 1) & 7) << 5;
g = ((vdp.cram[(index << 1) | 0] >> 5) & 7) << 5;
b = ((vdp.cram[(index << 1) | 1] >> 1) & 7) << 5;
}
else
{
r = ((vdp.cram[index] >> 0) & 3) << 6;
g = ((vdp.cram[index] >> 2) & 3) << 6;
b = ((vdp.cram[index] >> 4) & 3) << 6;
}
bitmap.pal.color[index][0] = r;
bitmap.pal.color[index][1] = g;
bitmap.pal.color[index][2] = b;
pixel[index] = MAKE_PIXEL(r, g, b);
bitmap.pal.dirty[index] = bitmap.pal.update = 1;
clut[index] = ( ((b>>3)<<10) | ((g>>3)<<5) | (g>>3) );
//clut[index | 0x20] = ( ((b>>3)<<10) | ((g>>3)<<5) | (r>>3) );
//clut[index | 0x40] = ( ((b>>3)<<10) | ((g>>3)<<5) | (r>>3) );
}
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If you need to see the real thing, you can download a working binary here and full source code here.
Hope you guys can help me on this issue, so we can have another great emulator for the PS2 homebrew library! ;)
Thanks!
bootsector |
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Lukasz
Joined: 19 Jan 2004
Posts: 248
Location: Denmark
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| Posted: Mon Feb 25, 2008 2:15 am Post subject: |
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Your issue is that the CLUT colors on the PS2 are not stored in order from 0 to 31, instead you should store it in this order (first 32 values, indices in HEX)
| Code: |
00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17
08 | 09 | 0A | 0B | 0C | 0D | 0E | 0F | 18 | 19 | 1A | 1B | 1C | 1D | 1E | 1F
...
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See the GS Manual section "CLUT Storage Mode" for more details.
Nice job bringing the emulator code up to date :-)
_________________
Lukasz.dk |
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bootsector_
Joined: 25 Feb 2008
Posts: 15
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| Posted: Mon Feb 25, 2008 3:33 am Post subject: |
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You're right, Lukasz! I noted that ragnarok2040 did this on FCEUltra. I actually tried to do this in PSMS, but by the wrong way! Now I fixed the palette_sync function and it's now generating a valid CLUT! Thanks for your support!
Best regards,
bootsector |
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cosmito
Joined: 04 Mar 2007
Posts: 314
Location: Portugal
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| Posted: Mon Feb 25, 2008 4:35 am Post subject: |
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| Thanks bootsector_ for keeping the PS2 scene alive in these days. I recommend you a free SVN repository service (www.assembla.com) for keeping your sources. This way, you'll have a free repository for you files and for us an always up-to-date version. |
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bootsector_
Joined: 25 Feb 2008
Posts: 15
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Wraggster
Joined: 26 Aug 2005
Posts: 121
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| Posted: Wed Feb 27, 2008 1:46 am Post subject: |
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thanks for the news/release, great to see the PS2 get some more loving these days :)
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DCEMU The Worlds Only Homebrew & Gaming Network of Sites. |
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