From: Delayed Mail (null++at++atlantis.com)
Date: 02/01/2000 07:20:09
----- Original Message -----
From: "ramey" <ramey++at++de-solutions.com>
To: "info-performer Mailing List" <info-performer++at++sgi.com>
Sent: Monday, January 31, 2000 1:02 PM
Subject: Intensity Textures
> Does anyone know how to get Intensity textures to work in performer?
>
>
> I am going out of my mind as performer (as best I can tell) is useing a
> GL_LUMINANCE texture here and this is NOT what I want. The image is
> showing up right(it is simmply 255 or 0 based on whether something
> should be drawn or not, but I want the 0s to be clear).
>
>
> tex->setImage((uint*)m_image,1,128,128,0);
> tex->setFormat(PFTEX_INTERNAL_FORMAT,PFTEX_I_8);
> tex->setFormat(PFTEX_EXTERNAL_FORMAT,PFTEX_PACK_8);
>
> tev->setMode(PFTE_MODULATE);
>
>
> gState->setMode(PFSTATE_TRANSPARENCY,PF_ON);
> gState->setMode(PFSTATE_ENTEXTURE,PF_ON);
> gState->setMode(PFSTATE_ALPHAFUNC,PF_ON);
> gState->setMode(PFSTATE_ALPHAFUNC,PFAF_GREATER);
> gState->setVal(PFSTATE_ALPHAREF,0.5f);
> gState->setAttr(PFSTATE_TEXTURE,tex);
> gState->setAttr(PFSTATE_TEXENV,tev);
>
>
> where image came from:
>
>
> register int Idx;
> register unsigned char bitmask;
> for(int row=0;row<8;++row){
> for(int letterRow=0;letterRow<13;++letterRow){
> for(int col =0;col<12;++col){
> bitmask = 128;
> for(int bit=1;bit<9;++bit){ // bit will cause each letter to
> be padded by one blank on each side
> Idx = bit+col*10+letterRow*128+row*13*128;
> if(rasters[row*12+col][letterRow] & bitmask) m_image[Idx]
> = 255;
> bitmask /=2;
> }
> }
> }
> }
>
>
>
> GLubyte rasters[][13] = {
> {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> 0x00}, // space
> {0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
> 0x18}, // !
> {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x36, 0x36, 0x36,
> 0x36}, // "
> ect
> ect
> ect
>
> --
> "Haven't you heard? We come in six packs now." -Zaphod Beeblebrox
> Larry E. Ramey
> ramey++at++de-solutions.com
> -----------------------------------------------------------------------
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