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GLenum as property in Objective-C OpenGL
if (numberOfMipmaps > 0) {
    if (textureData != 0)
        glDeleteTextures(1, &textureData);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glGenTextures(1, &textureData);
    glBindTexture(GL_TEXTURE_2D, textureData);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    CHECK_GL_ERROR();

    for (GLint i = 0; i < numberOfMipmaps; i++) {
        unsigned char *data = mipmaps[i].address;

        glTexImage2D(GL_TEXTURE_2D, i, internalFormat, width, height, 0, format, target, data);
        //glGenerateMipmapOES(GL_TEXTURE_2D);
        CHECK_GL_ERROR();

        width = MAX(width >> 1, 1);
        height = MAX(height >> 1, 1);
    }
}

@property (nonatomic, assign) GLint internalFormat;
@property (nonatomic, assign) GLenum format;
@property (nonatomic, assign) GLenum target;

internalFormat = GL_RGBA;
format = GL_RGBA;
target = GL_UNSIGNED_SHORT_5_5_5_1;

glTexImage2D(GL_TEXTURE_2D, i, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_SHORT_565, data);