Skybox cubemap problem

Greetings:
I am trying to set up a cubemap skybox in fixed-function. Code is below. All I see are white and black rectangles - textures don’t seem to draw at all. I know my getbmp function to read in the 6 cube textures is ok, because I tried it in a different (regular texture, not cubemap) program.
Btw, the texture coords are just a test to see one face of the cube (I know they need to be rotated for a practical skybox).

Any pointers as to what I am doing wrong?

Thanks in advance,
Sam

void init(void)
{    
   glClearColor(0.0, 0.0, 0.0, 0.0);
   glEnable(GL_DEPTH_TEST); 

   glGenTextures(1, &texture);

   glEnable(GL_TEXTURE_CUBE_MAP); 

   BitMapFile *image[6];

   image[0] = getbmp("../Textures/ForestCubemapTextures/posx.bmp");
   image[1] = getbmp("../Textures/ForestCubemapTextures/negx.bmp");
   image[2] = getbmp("../Textures/ForestCubemapTextures/posy.bmp");
   image[3] = getbmp("../Textures/ForestCubemapTextures/negy.bmp");
   image[4] = getbmp("../Textures/ForestCubemapTextures/posz.bmp");
   image[5] = getbmp("../Textures/ForestCubemapTextures/negz.bmp");
   
   glBindTexture(GL_TEXTURE_CUBE_MAP, texture);
   
   glTexImage2D(GL_TEXTURE_CUBE_MAP, 0, GL_RGBA, 2048, 2048, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

   for (int face = 0; face < 6; face++)
   {
      int target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + face;
      glTexSubImage2D(target, 0, 0, 0, 2048, 2048, GL_RGBA, GL_UNSIGNED_BYTE, image[face]); 
   }
   glTexParameteri (GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   glTexParameteri (GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri (GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
   glTexParameteri (GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri (GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); 
}

void drawscene(void)
{
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   glLoadIdentity();

   glBindTexture(GL_TEXTURE_CUBE_MAP, texture);
   glBegin(GL_POLYGON);
      glTexCoord3f(-1.0, -1.0, -1.0); glVertex3f(-100.0, -100.0, -99.0);
      glTexCoord3f(1.0, -1.0, -1.0); glVertex3f(100.0, -100.0, -99.0);
      glTexCoord3f(1.0, 1.0, -1.0); glVertex3f(100.0, 100.0, -99.0);
      glTexCoord3f(-1.0, 1.0, -1.0); glVertex3f(-100.0, 100.0, -99.0);
   glEnd();

   glutSwapBuffers();	
}

Try replacing this

glTexImage2D(GL_TEXTURE_CUBE_MAP, 0, GL_RGBA, 2048, 2048, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

   for (int face = 0; face < 6; face++)
   {
      int target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + face;
      glTexSubImage2D(target, 0, 0, 0, 2048, 2048, GL_RGBA, GL_UNSIGNED_BYTE, image[face]); 
   }

with this

   for (int face = 0; face < 6; face++)
   {
      int target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + face;
      glTexImage2D(target, 0, GL_RGBA, 2048, 2048, 0, GL_RGBA, GL_UNSIGNED_BYTE,image[face]);
   }

Thanks, bobtedbob.
Still no joy but I see your suggestion makes sense because glTexImage2D(GL_TEXTURE_CUBE_MAP, …) is not even legal.

If someone has fixed-function cubemap skybox code which they might be willing to share that would be highly appreciated.

Some more things

you need disable depth testing/masking for skyboxes (as you need to always be inside the cube). Also used a CW ordering because you are inside the cube and you want the inside draw not the outside)

For me I use GL_TRIANGLES and I set the uv coordinates to be the same as the vertex. Here are the coordinates I use, you should be able to convert this to fixed pipeline easily

        //   7---6
        // 3-|-2 |
        // |-4--|5
        // 0---1
        float[] vertexArray = new float[]
        {
            -size, -size, size, // front bottom left
            size, -size, size, // front bottom right
            size, size, size, // front top right
            -size, size, size, // front top left


            -size, -size, -size,//back  bottom left
            size, -size, -size, //back  bottom right
            size, size, -size, // back top right
            -size, size, -size // back top left
        };


        float[] uvArray = new float[]
        {
            -size, -size, size, // front bottom left
            size, -size, size, // front bottom right
            size, size, size, // front top right
            -size, size, size, // front top left


            -size, -size, -size,//back  bottom left
            size, -size, -size, //back  bottom right
            size, size, -size, // back top right
            -size, size, -size // back top left
        };

Thanks again for the help.
Finally got it working. Took many more hours than I thought it would:-)