Re: load .rgb file as opengl texture map?

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Brian Furtaw (brian++at++hotsauce.clubfed.sgi.com)
Fri, 22 Sep 1995 08:10:30 -0400

This uses ImageVision Library but try this out, if you don't have IL use
libgutil's unsigned long *longimagedata(char * filename, char *mode) must link
to libimage also.

Here's some code...

#include <GL/gl.h>
#include <il/ilGenericImgFile.h>
#include <il/ilImage.h>

unsigned char *
createTex( char *imgfile, GLsizei *width, GLsizei *height, GLsizei *depth)
{
    unsigned char *buffer;

    ilFileImg* img = ilOpenImgFile(imgfile, "r");
    if (img == NULL) {
        printf ("Couldn't open image file: %s\n", imgfile);
        exit(0);
    }
    ilSize size;
    img->getSize(size);
    *width = size.x;
    *height = size.y;
    *depth = size.c;

    buffer = (unsigned char *)
      malloc( size.x * size.y * size.c * sizeof(unsigned char));
    img->getTile(0, 0, size.x, size.y, buffer);
    return buffer;

}

GLvoid
initTex( char *tfile )
{
    unsigned char *textureMap;
    GLsizei width, height, depth;

    textureMap = createTex( tfile, &width, &height, &depth );

    // assumes textureMap is already a power of two
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glTexImage2D( GL_TEXTURE_2D, 0, depth, width, height, 0,
      GL_RGB, GL_UNSIGNED_BYTE, textureMap);
    // generate the MipMaps
    gluBuild2DMipmaps( GL_TEXTURE_2D, depth, width, height,
      GL_RGB, GL_UNSIGNED_BYTE, textureMap);

    // set up mapping parameters
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
      GL_NEAREST_MIPMAP_NEAREST);
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

}

GLvoid
drawScene( GLvoid )
{

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