Your texture definition is wrong. In glTexImage2D is a error. You pass 3bytes, 24bits per pixel (3), but Your data has 4bytes, 32 bits per pixel (GL_RGBA):

Qt Code: 
  1. glTexImage2D(GL_TEXTURE_2D, 0, 3, GLFormatImage.width(), GLFormatImage.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, GLFormatImage.bits());
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it should be either:
Qt Code: 
  1. glTexImage2D(GL_TEXTURE_2D, 0, 4, GLFormatImage.width(), GLFormatImage.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, GLFormatImage.bits());
  2. // or
  3. glTexImage2D(GL_TEXTURE_2D, 0, 3, GLFormatImage.width(), GLFormatImage.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, GLFormatImage.bits());
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