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#1 2009-01-28 01:12:57
- Cid2mizard
- Member
Get pixel color
I'm interresting to get a fonction which return the pixel color, it's very good for a pixel detection or collision.
may be :
int GRRLIB_GetPixelColor(GRRLIB_texImg tex, int x, int y)
{
u32 color;
//....
return (color);
}
Thanks
Last edited by Cid2mizard (2009-01-28 01:22:06)
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#2 2009-01-28 08:41:42
- NoNameNo
- Administrator
Re: Get pixel color
you mean the color detection in a texture buffer ?? or you would say in the entire video buffer ??
i think the video buffer will be more usefull, i will code is soon.
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#3 2009-01-28 10:08:59
#5 2009-02-06 02:04:41
- Cid2mizard
- Member
Re: Get pixel color
Yes very good, big thanks 
Last edited by Cid2mizard (2009-02-06 11:25:02)
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#6 2009-02-06 14:21:43
- spiffen
- Member
Re: Get pixel color
While you're at it, could you write a PutPixel function as well, that ofcourse works on textures too (not sure if there is any difference)..
EDIT:
Sorry for that.. Checked SVN, and ofcourse you added that function as well.. 
Last edited by spiffen (2009-02-06 14:32:21)
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#7 2009-02-06 17:55:40
- NoNameNo
- Administrator
Re: Get pixel color
take care with the GRRLIB_SetPixelTotexImg, since i Call DCFlushRange each time you call GRRLIB_SetPixelTotexImg, this function is very very slow, you'd better pre-calcul all your needs then run your code, avoid pre-calc during your app.
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#8 2009-02-06 22:07:49
- Crayon
- Bad Mother Fucker
Re: Get pixel color
NoNameNo wrote:
take care with the GRRLIB_SetPixelTotexImg, since i Call DCFlushRange each time you call GRRLIB_SetPixelTotexImg, this function is very very slow, you'd better pre-calcul all your needs then run your code, avoid pre-calc during your app.
With revision 29, this is not true anymore, use GRRLIB_SetPixelTotexImg as much as you want and at the end just call GRRLIB_FlushTex. Look at the template for an example:
http://code.google.com/p/grrlib/source/ … rce/main.c
Useful links: libOGC Documentation, libOGC Repository, GRRLIB Documentation, GRRLIB Repository, #GRRLIB on IRC
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#9 2009-02-07 01:18:57
- Cid2mizard
- Member
Re: Get pixel color
It's good for grrlib 3.0.1 ?
Code:
u32 GRRLIB_GetPixelFromtexImg(int x, int y, int w, u8 * GRRLIB_LoadTexture)
{
u8 *truc = (u8*)GRRLIB_LoadTexture;
u8 r, g, b, a;
u32 offset;
offset = (((y >> 2)<<4)*w) + ((x >> 2)<<6) + (((y%4 << 2) + x%4 ) << 1); // Fuckin equation found by NoNameNo ;)
a=*(truc+offset);
r=*(truc+offset+1);
g=*(truc+offset+32);
b=*(truc+offset+33);
return((r<<24) | (g<<16) | (b<<8) | a);
}Because color is u32 and the return is -1 for white, 0 for black and -256 for no color pixel.
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#10 2009-02-08 00:46:11
- NoNameNo
- Administrator
Re: Get pixel color
i think you are wrong, since the returned value is a U32 meaning unsigned 32 bit long, you cant get negative result. check your print code
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#11 2009-02-08 01:25:59
- Cid2mizard
- Member
Re: Get pixel color
yes it's me i have forget ">>8) & 0XFF;" for my u32 color ^^
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