OpenGL: texture is not loading through glGenerateMipmap

OpenGL: texture is not loading through glGenerateMipmap

Hi I'm asking this question because I got an annoying problem. I passed a
lot of tutorials and none of them worked for me. Maybe I do something
wrong? The problem is simple: I can't load texture through
glGenerateMipmap on my cube. I load the BMP texture from resource.h file.
My load function is called on WM_CREATE and looks like this:
void LoadTEX()
{
GLuint texture;
HBITMAP GLtex;
BITMAP tex;
byte Texture=TEX;
GLtex= (HBITMAP)LoadImage(GetModuleHandle(NULL),MAKEINTRESOURCE(Texture),
IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);
GetObject(GLtex,sizeof(tex), &tex);
glPixelStorei(GL_UNPACK_ALIGNMENT,sizeof(Texture));
glEnable(GL_TEXTURE_2D);
glGenTextures(sizeof(Texture), &texture);
glBindTexture( GL_TEXTURE_2D, texture );
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexImage2D( GL_TEXTURE_2D,
0,
GL_RGB,
tex.bmWidth,
tex.bmHeight,
0,
GL_RGB,GL_UNSIGNED_BYTE,
tex.bmBits);
glDeleteTextures(sizeof(Texture), &texture);
}
On WM_PAINT:
glColor3f(1.0f,1.0f,1.0f);
glEnable(GL_TEXTURE_2D);
glBindTexture( GL_TEXTURE_2D, texture );
// glActiveTexture(GL_TEXTURE0);
// glGenerateMipmap(GL_TEXTURE_2D);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, tex.bmWidth, tex.bmHeight, GL_RGB,
GL_UNSIGNED_BYTE, tex.bmBits);
The above code works fine (texture is in place) but the problem is that it
gives me 40 FPS which is very poor result (without texture been bonded I
get around 300 FPS).
Second is that I don't want to use gluBuild2DMipmaps because it's a bit
old, instead I want to use glGenerateMipmap. Problem is that if I comment
out gluBuild2DMipmaps and uncomment glActiveTexture(GL_TEXTURE0);,
glGenerateMipmap(GL_TEXTURE_2D) nothing is shown.
My PIXELFORMATDESCRIPTOR looks like:
PIXELFORMATDESCRIPTOR pfd;
int format;
// get the device context (DC)
*hdc = GetDC( hwnd );
// set the pixel format for the DC
ZeroMemory( &pfd, sizeof( pfd ) );
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 32;
pfd.iLayerType = PFD_MAIN_PLANE;
format = ChoosePixelFormat( *hdc, &pfd );
SetPixelFormat( *hdc, format, &pfd );
All this running on ATI and OPENGL 3.1 support. I call the
glEnable(GL_TEXTURE_2D); so this should work with ati cards so the problem
is elsewhere. This is the last step to end my program and just I can't
stand that!