> dmitry wrote: > > > > > It seems to me that it is possible to render the Fl_Double_Window or > > Fl_Window to memory as a bitmap. But how? > > > > I am interested in using this option to create gl textures from such > > bitmaps. Is it Possible? And how? > > > > > > > > > // image size, in the power of two to have it compatible > // with opengl texture sizes > int w = 256; > int h = 256; > > > unsigned char * image_data = new unsigned char[w*h*3]; > > // creating screen-compatible, platform dependent offscreen drawable > Fl_Offscreen o = fl_creare_ofscreen(w, h); > > // making it current > fl_begin_offscreen(o); > > // place your fltk drawings here > .... > .... > .... > > // reading the data from the drawable to the RGB memory > fl_read_image(image_data, 0, 0, w, h); > > // setting back previous drawable as current > fl_end_offscreen(); > > // deleting offscreen > fl_delete_offscreen(o); > > > > > OpenGL code: > > > > // create your texture and load data to it, ie: > > GLuint texture_id; > glGenTextures(1, &texture_id); > > if(!texture_id) // something wrong... > handle_error(); > > // make the texture current > glBindTexture(GL_TEXTURE_2D, texture_id); > > // set your other texture property here, like > // GL_TEXTURE_MIN_FILTER, > // GL_TEXTURE_MAG_FILTER, > // GL_TEXTURE_WRAP_S, > // GL_TEXTURE_WRAP_T > > // loading data eg using glu and building mipmaps for nice scaling > gluBuild2DMipmaps(GL_TEXTURE_2D, 3, w, h, GL_RGB, GL_UNSIGNED_BYTE, > image_data); > > > // delete image data not needed any more > delete[] image_data; > > Your texture is now loaded with the identifier > texture_id > Look for fl_create_offscreen(), fl_begin_offscreen(), fl_end_offscreen() > and fl_read_image() functions in the documentation. > > > R.
thanks a lot. _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
