opengl tga textured polygon shows up white

thunderBuns

Hi I have created a polygon and am trying to apply a texture that I loaded from a .tga file in the same directory as the exe here is the relevant code:

bool loadTGA(const char *filename, STGA& tgaFile)
{
    FILE *file;
    unsigned char type[4];
    unsigned char info[6];

        file = fopen(filename, "rb");

        if (!file)
        return false;

    fread (&type, sizeof (char), 3, file);
    fseek (file, 12, SEEK_SET);
    fread (&info, sizeof (char), 6, file);

    //image type either 2 (color) or 3 (greyscale)
    if (type[1] != 0 || (type[2] != 2 && type[2] != 3))
    {
        fclose(file);
        return false;
    }

    tgaFile.width = info[0] + info[1] * 256;
    tgaFile.height = info[2] + info[3] * 256;
    tgaFile.byteCount = info[4] / 8;

    if (tgaFile.byteCount != 3 && tgaFile.byteCount != 4) {
        fclose(file);

        return false;
    }


    long imageSize = tgaFile.width * tgaFile.height
 * tgaFile.width * tgaFile.byteCount;

    //allocate memory for image data
    tgaFile.data = new unsigned char[imageSize];

    //read in image data
    fread(tgaFile.data, sizeof(unsigned char), imageSize, file);

    //close file
    fclose(file);
glGenTextures(1,&texture[0]);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexImage2D(GL_TEXTURE_2D,0,3,tgaFile.width,tgaFile.height,0,GL_RGB,GL_UNSIGNED_BYTE,tgaFile.data);
glBindTexture(GL_TEXTURE_2D, texture[0]);

    return true;
}




void interf (void)
{
STGA tgaFile;
loadTGA("Irk.tga",tgaFile);
 
  
  glBindTexture(GL_TEXTURE_2D,texture[0]);
  glBegin(GL_QUADS);
  //glColor3f(0.3,0.4,0.8);
  glTexCoord2f(0,0); glVertex2f(-3,4);
    glTexCoord2f(1,0); glVertex2f(-1,4);
      glTexCoord2f(1,1); glVertex2f(-1,8);
        glTexCoord2f(0,1); glVertex2f(-3,8);
  glEnd();
}

Any ideas as to why the polygon just shows up white?
Thanks in advance.

satchmo

Make sure texturing is enabled with glEnable(GL_TEXTURE_2D); before drawing.

thunderBuns

Yeah I have glEnable in my init funtion but I put it in just above the glGenTextures just to check. No change though it still shows up as a white square. Any other suggestions?

fasty

What are the dimensions of the texture?

thunderBuns

Ah I changed it to 512x512 there and now it shows up. Well spotted. It's still a little screwy though the bottom triangle shows up fine but the top one is all stretched and wierd. Is this to do with my texCoords?