Raspberry Pi Forums

Pablo Walters

I got it working by adding this to the shaders!

#extension GL_ARB_draw_instanced : enable
#define gl_InstanceID gl_InstanceIDEXT

Pablo Walters

I'd like to do instanced drawing like I do on iOS and OSX.

But neither

gl_InstanceID

nor

gl_InstanceIDEXT

are defined when compiling OpenGL ES shaders.

Is there a way to make this work on PI?

Pablo Walters

You can install xinput like this:

% sudo apt-get install xinput

I ended up doing this to slow the mouse down by a factor of 0.2.

% xinput -set-prop 7 130 0.200000 0.000000 0.000000 0.000000 0.200000 0.000000 0.000000 0.000000 1.000000

Thanks for the suggesting of using xinput.

Pablo Walters

The cursor is moving far too fast for me. Under X windows on an HD display, I've tried 3 different mice, and for all of them, moving the mouse 4cm left to right moves the cursor all the way cross the screen. I tried using the Preferences/Mouse and Keyboard Settings to slow the mouse down, but the co...

Pablo Walters

FYI - The source file glad.c in the GLFW distribution does not load functions to support VertexArrays, Framebuffers and Renderbuffers, etc. I added a these to glad.c to make them work: diff glad.c.orig glad.c 1402a1403,1428 > > glad_glIsRenderbuffer = (PFNGLISRENDERBUFFERPROC)load("glIsRenderbuffer"...

Pablo Walters

RaspPIglfw.JPG I got glfw working on Raspberry PI using rpiMike's suggestion! Here's the full sequence of things you have to do. 1. Select "GL Driver, Full KMS" by running raspi-config sudo raspi-config (Select Advanced Options, GL Driver, Full KMS. Then reboot) 2. download zip of glfw from github ...

Pablo Walters

That sounds great. I enabled GL Driver, Full KMS, and restarted.

Are there any simple examples that show how to compile a simple

c application using glfw on Raspberry PI?

I downloaded glfw from github and when I tried "cmake ." it failed with

a message that RandR headers were not found.

Pablo Walters

I'd like to use OpenGL under X windows.

Pablo Walters

Thanks for this explanation - appreciate it. I was just surprised that my C code did not work on Raspoberry PI. This is from a polygon scan converter I've used for 20 years without any problem on SGI, PC, OSX, iOS and Android. I agree this is a very very bad way to write C. Always happy to learn som...

Pablo Walters

You're right - this is some sketchy C that I used to use in the old days.

I'll avoid this construct in future.

Pablo Walters

The bug only appears when compiling -O2 or -O3. It runs perfectly if optimization is off. C source: #include "stdio.h" typedef struct poly { struct poly *next; int v0; int v1; int v2; } poly; int main(int argc, char **argv) { poly *span, *active; span = (poly *)&active; span->next = 0; while(span->n...

Pablo Walters

Thanks for all the help! I got it all working fine. Here's a github

repository with the project.

https://github.com/PaulHaeberli/EnvMap3d-Raspberry-PI

I hope to make the source code for this available soon.

Also working on making it work with the desktop GL driver turned on.

Pablo Walters

If I install my application binaries in /usr/bin or /usr/local/bin, where
is a good place to install bitmap images and other resources the app
needs?

Should I compile all that data into the app, or can I install a directory
somewhere with the data?

Pablo Walters

Ok. I''ll install the app in /opt and make a temp directory in /tmp/ with the name of the app in it. What's the best way of adding my app directory to the PATH when installing? How can I make an icon for the app and install that in the right place for the window manager? Is there a way to automatica...

Pablo Walters

Where is a good place to write application specific temp data?

For iOS, OSX, and adroid apps there is a nice sand boxed temp directory
associated with each app.

Pablo Walters

I want to make it easy for users to install my app with an icon, resources, and execuable. This is a small graphics app that uses OpenGL and runs in an X window.

Pablo Walters

And the desktop's windows are moved, resized etc faster now. Because this new driver provides HW accelerated X11 2D support (AFAIK this is called Glamor on Linux?) and HW accelerated 3D via OpenGL. So the Pi²'s user experience is visibly better now, with the plain desktop and with 3D apps like Blen...

Pablo Walters

I'd like to do fullscreen OpenGL but also have mouse input and a visible tracking cursor. What's the bast way to do this?

Thanks for any hints.

Pablo Walters

I just made this work again for Raspberry PI 3 Model B

It is a nice simple way to get OpenGLES2.0 running inside
a window when running PIXEL on RPI 3 Model B

https://github.com/PaulHaeberli/pi-eglonx

Pablo Walters

I just made this work again for Raspberry PI 3 Model B

It is a nice simple way to get OpenGLES2.0 running inside
a window when running PIXEL on RPI 3 Model B

https://github.com/PaulHaeberli/pi-eglonx

Search found 20 matches

Re: Is there a way to use gl_InstanceID in shaders?

Is there a way to use gl_InstanceID in shaders?

Re: How to slow down mouse under X windows.

How to slow down mouse under X windows.

Re: Has anyone been able to get glfw running?

Re: Has anyone been able to get glfw running?

Re: Has anyone been able to get glfw running?

Has anyone been able to get glfw running?

Re: Where to report c compiler bug?

Re: Where to report c compiler bug?

Where to report c compiler bug?

Re: How can I package an application for distribution?

Re: How can I package an application for distribution?

Re: How can I package an application for distribution?

Re: How can I package an application for distribution?

How can I package an application for distribution?

Re: Why the obsession with OpenGL?

What is the best way to do full screen OpenGL?

Re: X11 EGL on the Raspberry Pi

Re: Windowed OpenGLES sample