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I can't figure it out how to properly write and read from a QOpenGLBuffer:: PixelUnpackBuffer.

1. What is the proper setup before writing into a PBO?
2. QOpenGLBuffer::write will not work using with a simple QImage.bits(), or glReadPixels() to pass the FBO render into the PBO. It has to be a specific type of data?
3. How do you use a written PBO with Texture::setData()? A simple Texture.setData(*format*, *pixel_type*, pubo, nullptr) will suffice?

Here some code to exemplify what I'm doing:

for example,In the following code, in the function “glVertex3f”, a constant between 1 and-1 is used to represent a point

I'm experimenting with compute shaders. What I want to do is sending the data of arr1 to compute shader variable shader_arr1[], make all of its elements 1 and read that result back to the CPU side in arr2[] variable. However, running the following program I get the same initial value of arr1[]{1,2,3,4,5,6,7} in arr2[], nothing was changed. Could you tell me what part I'm doing wrong?

I have this OpenGL program in C++ which is a moving circle, vubes in the background and a line which can move up or down is you press the W or the S button. When the line is in the middle of the screen the cubes which are below the line should have green color, and for the cubes above the line the color should be red.

When the line is moved up the color of the cubes should change, so when the line is in the top of the scrren every cube needs to be red.

In my code when I move the Line up it changes his color when it needs to be but the cubes has the color from the beginning of the run to the end, no matter where I move the line.

Attaching the code:

I don't have very much experience with OpenGL, GLFW, or GLEW so my troubleshooting ability with these libraries is slim to none. I have managed to render a triangle ([-1, -1, 0], [1, -1, 0], [0, 1, 0]) but when using the vertex attribute coordinates for a cube, along with color attributes it seems to not render. There could be a lot wrong with my code, the shaders, and my matrix operations. I wish I had a clearer understanding of what I'm doing so I could give a more descriptive account of my error. Currently the above code only renders the window. I followed https://learnopengl.com/ initially and got the first tutorials working, the following code is my "testing" file where I've attempted to reimplement some of the elements myself. There are lots of copy pasted portions that may be shared with that tutorial if it helps at all.

Any insight or suggestions would be appreciated very much.

Main Source

I need to create some project with OpenGL on my MacOS Big Sur 11.2.2.

My versions:

I have a very simple example of a OpenGL ES program that I'm trying to get to run on RaspiOS Desktop (a.k.a. Raspbian) on Raspberry Pi 4.

My goal is very simple - to draw a red triangle in the center of the screen. However, the triangle comes out as white instead of red.

I've searched and tried everything and wasn't able to find any help. I'm very frustrated at this point because this was just supposed to be the first tutorial to introduce the world of OpenGL ES and I'm already stuck and can't continue with more complicated examples.

Anyway, here's the full example

In a shader I want to pass an array of primitives into it as a vertex attribute.

In the shader I declare

I'm trying to get a spinning 3D cube but I can't get it to render. There's no error, but it's just a black screen. Also, there's no checking whether the Fragment shader is working but I can assure you it is I just don't have it included here.

Here's what my code looks like: