Yeah, looks like I wasn't understanding the mechanism of buffer binding. As for painting -- what I am trying to say is that you'll have to lay down vertices to hold the colors in position.
I'll see if I can draft up a version of your implementation where that makes more sense. Thanks, -- Raul On Sat, Feb 29, 2020 at 6:56 PM Brian Schott <schott.br...@gmail.com> wrote: > > Raul, > > Yes, I have, and had, read that buffer page. It does not shed light on your > comment for me. > > > Regarding 'paint'ing, your comment makes sense, but is not prescriptive > enough for me to move forward. > I have experimented in several ways but with no usable results. > > For example, I tried the following verb. Upon entering `forward 0` in the > Terminal all I notices is that the graphics pane had everything below its > main diagonal permanently cleared of anything except the black background > color. 3 lines of output are produced in the Terminal pane: 4 4 ; HI ; 0 . > > forward=: 3 : 0 > wh=. gl_qwh'' > glClearColor 1 1 1 1 > glClear GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT > glUseProgram sprog > glEnable GL_DEPTH_TEST > glEnable GL_CULL_FACE > echo $mvp > glUseProgram 0 > echo'HI' > gl_paint'' > ) > > When I tried to put almost all of the current a_g_paint verb definition > into forward, nothing happened in the graphics pane, but I think I got the > same 3 lines in the Terminal pane. > > In neither case is an error raised. > > > On Sat, Feb 29, 2020 at 6:29 PM Raul Miller <rauldmil...@gmail.com> wrote: > > > Have you read the second paragraph at > > > > https://www.khronos.org/registry/OpenGL-Refpages/es2.0/xhtml/glBindBuffer.xml > > ? > > > > As for your paint issue--you're basically going to need instructions in the > > paint callback which lays down geometry (or whatever) for your painted > > surface. > > > > Does this make sense? > > > > Thanks, > > > > -- > > Raul > > > > -- > (B=) > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
