imap.h File Reference

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Functions
rawimage *	AllocateImage (char *)
void	DeallocateImage (rawimage *)
color	ImageMap (rawimage *, flt, flt)
void	LoadImage (rawimage *)
void	ResetImage (void)
void	ResetImages (void)

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Function Documentation

rawimage* AllocateImage

(

char *

)

Definition at line 140 of file imap.cpp.

References rawimage::bpp, rawimage::data, rawimage::loaded, rawimage::name, numimages, rt_getmem(), rtbomb(), rawimage::xres, and rawimage::yres.

Referenced by apitextotex().

                                          { 
  rawimage * newimage = NULL;
  int i, len, intable;

  intable=0;
  if (numimages!=0) {
    for (i=0; i<numimages; i++) {
      if (!strcmp(filename, imagelist[i]->name)) {
        newimage=imagelist[i];
        intable=1;
      }
    }
  }

  if (!intable) {
    newimage=(rawimage *)rt_getmem(sizeof(rawimage));
    newimage->loaded=0;
    newimage->xres=0;
    newimage->yres=0;
    newimage->bpp=0;
    newimage->data=NULL;
    len=strlen(filename);
    if (len > 80) rtbomb("Filename too long in image map!!"); 
    strcpy(newimage->name, filename);

    imagelist[numimages]=newimage;  /* add new one to the table       */ 
    numimages++;                    /* increment the number of images */
  }
 
  return newimage;
}

void DeallocateImage

(

rawimage *

)

Definition at line 172 of file imap.cpp.

References rawimage::data, rawimage::loaded, and rt_freemem().

                                       {
  image->loaded=0;
  rt_freemem(image->data);
}

color ImageMap	(	rawimage *	,
		flt	,
		flt
	)

Definition at line 88 of file imap.cpp.

References color::b, rawimage::data, color::g, rawimage::loaded, LoadImage(), color::r, rawimage::xres, and rawimage::yres.

Referenced by image_cyl_texture(), image_plane_texture(), and image_sphere_texture().

                                               {
  color col, colx, colx2;
  flt x,y, px, py;
  int x1, x2, y1, y2;
  unsigned char * ptr;
  unsigned char * ptr2;

  if (!image->loaded) {   
    LoadImage(image);
    image->loaded=1;
  }

  if ((u <= 1.0) && (u >=0.0) && (v <= 1.0) && (v >= 0.0)) {
    x=(image->xres - 1.0) * u; /* floating point X location */
    y=(image->yres - 1.0) * v; /* floating point Y location */

    px = x - ((int) x);
    py = y - ((int) y);

    x1 = (int) x;
    x2 = x1 + 1;

    y1 = (int) y;
    y2 = y1 + 1;

    ptr  = image->data + ((image->xres * y1) + x1) * 3; 
    ptr2 = image->data + ((image->xres * y1) + x2) * 3; 

    colx.r = (flt) ((flt)ptr[0] + px*((flt)ptr2[0] - (flt) ptr[0])) / 255.0; 
    colx.g = (flt) ((flt)ptr[1] + px*((flt)ptr2[1] - (flt) ptr[1])) / 255.0; 
    colx.b = (flt) ((flt)ptr[2] + px*((flt)ptr2[2] - (flt) ptr[2])) / 255.0; 

    ptr  = image->data + ((image->xres * y2) + x1) * 3; 
    ptr2 = image->data + ((image->xres * y2) + x2) * 3; 

    colx2.r = ((flt)ptr[0] + px*((flt)ptr2[0] - (flt)ptr[0])) / 255.0; 
    colx2.g = ((flt)ptr[1] + px*((flt)ptr2[1] - (flt)ptr[1])) / 255.0; 
    colx2.b = ((flt)ptr[2] + px*((flt)ptr2[2] - (flt)ptr[2])) / 255.0; 

    col.r = colx.r + py*(colx2.r - colx.r);
    col.g = colx.g + py*(colx2.g - colx.g);
    col.b = colx.b + py*(colx2.b - colx.b);

  }
  else {
    col.r=0.0;
    col.g=0.0;
    col.b=0.0;
  }
  return col;
} 

void LoadImage

(

rawimage *

)

Definition at line 81 of file imap.cpp.

References rawimage::loaded, and readimage().

Referenced by ImageMap().

                                 {
  if (!image->loaded) {
    readimage(image);
    image->loaded=1;
  }
}

void ResetImage

(

void

)

void ResetImages

(

void

)

Definition at line 73 of file imap.cpp.

References MAXIMGS, and numimages.

Referenced by InitTextures().

                       {
  int i;
  numimages=0;
  for (i=0; i<MAXIMGS; i++) {
    imagelist[i]=NULL;
  }
}