Opengl: low fps when using texture

Question

After setting the texture there is 20fps before aplying the texture it was 300fps

My Code:

void LoadTEX()
{
  GLuint    texture;  
  HBITMAP   GLtex;
  BITMAP    tex;
  byte      Texture=TEX;

  glGenTextures(sizeof(Texture), &texture);
  GLtex= (HBITMAP)LoadImage(GetModuleHandle(NULL),MAKEINTRESOURCE(Texture), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);

  GetObject(GLtex,sizeof(tex), &tex);
  glPixelStorei(GL_UNPACK_ALIGNMENT,4);           
  glBindTexture(GL_TEXTURE_2D, texture);
  glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST );
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );     
  gluBuild2DMipmaps(GL_TEXTURE_2D, 3, tex.bmWidth, tex.bmHeight, GL_RGB,  GL_UNSIGNED_BYTE, tex.bmBits);
  DeleteObject(GLtex);  
}

as you can see I load the texture from my resourcs file. I call LoadTEX() in my main WINAPI loop.

The second problem is that the texture is a bit transparent so it takes the color from the face behind and mixes it with itself. Why?

Answer 1

I call LoadTEX() in my main WINAPI loop.

I'm assuming this means that you call this once per frame, in which case this is the reason for your performance drop. You should load the texture once before your loop, and then draw it each frame.

The second problem is that the texture is a bit transparent so it takes the color from the face behind and mixes it with itself

Without seeing your code for rendering the texture this is hard to say why. Disable blending with glDisable(GL_BLEND) and your texture will no longer be transparent.