Hi Bob,
Thanks! Will do... lots to learn in this fascinating language!
Kind regards,
Stan
On 2022-01-25 21:34, 'robert therriault' via Programming wrote:
Hi Stan,
If you have looked at the shader demo in Jqt Help | Studio | Qt
demos... there is a source button that will show the source that is
generating the window with the rotating cube. I have often take such an
existing source and then made changes to it to get a sense of how an
application works.
Cheers, bob
On Jan 25, 2022, at 18:35, Stan Blank <[email protected]> wrote:
Thank you, Raul!
The issue I'm having with the freeglut addon is that the addon seems to
load properly (no errors), but I am unable to create a window of any
kind.
However, I'm aware that my lack of J knowledge is most likely the
culprit and I have some homework to do first. I purchased Henry Rich's
"J for C" text and am currently slogging my way through. When I know
enough to ask more intelligent questions...
Again, thanks and best wishes,
Stan
I do not have much experience with GLUT. I was never able to find
documentation on it which I felt I adequately understood and which was
relevant to the kinds of things I have wanted to do.
But, also, there's a lot of problems that can lead to blank screens,
so one of the first things I try to do is make sure I can update the
background color. If I can do that, the next thing is to see if I can
get any geometry to render in front of the "camera". It's the little
things that get you...
That said, if you have code that you want us to see if we can sort out
(hopefully not too complicated, at the beginning -- small problems are
easier to isolate than big problems), post it somewhere and we can try
to take a look at it.
Thanks,
--
Raul
On Tue, Jan 25, 2022 at 1:07 PM Stan Blank <[email protected]> wrote:
Thanks to Bob, Raul, Bill, Elijah for the help in getting me started
with
OpenGL and J. I'm a complete beginner (albeit a retired math/physics
teacher) and I have my work cut out for me. The language is very
interesting to me and will hopefully help delay the onset of senility
as I
try to learn something new. Well, I can hope... :-)
I looked at the OpenGL examples in J6.02 (great!) and have now
installed
J9.03. I have the shader demo working in Windows and I'll try the Mac
(and
also linux) this evening if time permits. Fascinating stuff!
Question: I have installed the freeglut addon and it appears to load
properly (no errors), but I can not generate a window or graphic. I
have
some experience with OpenGL/GLUT using C, Python, Fortran, and various
flavors of Basic.
I'll do my best to not be a pest... it's time for me to dig in!
Cheers... and again, thanks!
Stan
It now works for me.
Thanks,
--
Raul
On Tue, Jan 25, 2022 at 10:09 AM bill lam <[email protected]> wrote:
I fixed the qtdemo addons. Shader should work on macos now. Please >>
update
and test again.
On 24 Jan 2022, at 12:02 PM, bill lam <[email protected]> wrote:
Thank you for this report. I also encountered the same issue on >> >
apple
m1. Norman Drinkwater reported that it worked in vm (a rotating >> >
cube)
but not on physical machine. I'll investigate further.
On Mon, Jan 24, 2022, 11:47 AM Raul Miller <[email protected]>
wrote:
That's an improvement.
After changing the minwh line to specify opengl version 4.1, I get
text (keys... scale... angle... matrix...) on the opengl screen
(previously it was just black). And, the text is updating - if I
recall correctly, though, I believe I should also be seeing a >> >
rotating
cube. And, I am not seeing any geometry being rendered -- only text.
For reference, with this change, here's what the shader demo dumps
into the jqt session:
GL_VERSION: 4.1 ATI-2.11.20
GL_VENDOR: ATI Technologies Inc.
GL_RENDERER: AMD Radeon Pro 560 OpenGL Engine
GL_SHADING_LANGUAGE_VERSION: 4.10
#version 410 core
in vec3 vertex;
in vec3 color;
out vec4 v_color;
uniform mat4 mvp;
void main(void)
{
gl_Position = mvp * vec4(vertex,1.0);
v_color = vec4(color,1.0);
}
#version 410 core
in vec4 v_color;
out vec4 fragColor;
void main(void)
{
fragColor = v_color;
}
Also:
glGetError_jgles_ ''
┌─┐
│0│
└─┘
I am not sure what else I should be checking. (If something went >> >
wrong
setting up the shader, I imagine there would have been a non-zero
error value.)
Thanks,
--
Raul
On Sun, Jan 23, 2022 at 10:01 PM bill lam <[email protected]> >> >
wrote:
Another reference
https://www.khronos.org/opengl/wiki/Programming_OpenGL_on_macOS
you can try edit the file shader.ijs in addons/demos/qtdemo around
line 11
from
minwh 300 300;cc g opengl flush;
to
minwh 300 300;cc g opengl version 4.1 flush;
the version of GLSL is different from the version of OpenGL
On 24 Jan 2022, at 10:22 AM, Raul Miller <[email protected]>
wrote:
On Sun, Jan 23, 2022 at 9:14 PM Elijah Stone >> > > >
<[email protected]>
wrote: On Sun, 23 Jan 2022, Raul Miller wrote: But that demo does not
work on my OSX (Mojave) machine (which >> > > >>> has
OpenGL
1.2). For whatever reasons (possibly including availability of
good
documentation), Apple has been slow to adopt newer versions of
OpenGL
Huh ... AFAIK apple stopped at opengl 4.2 or 4.3 or so which,
while not
great (I want dsa), is certainly passable; opengl 3.3 is a >> > > >>
pretty
decent
baseline, and I think opengl 2 has a programmable pipeline
already.
When I run the shader demo, I get:
GL_VERSION: 2.1 ATI-2.11.20
GL_VENDOR: ATI Technologies Inc.
GL_RENDERER: AMD Radeon Pro 560 OpenGL Engine
GL_SHADING_LANGUAGE_VERSION: 1.20
#version 120
I was referring to the value of GL_SHADING_LANGUAGE_VERSION.
(This is with a current set of addons.)
I do not know how that relates to the 4.1 mentioned in
https://support.apple.com/en-us/HT202823
FYI,
--
Raul
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