clankill3r / p5_terminal_graphics Goto Github PK

Right now the std_err.txt file always contains the following:

OpenGL error 1282 at top endDraw(): invalid operation
The pixels array is null.

To explain the issue, I first will explain how this library is done.

The P5_Terminal_Graphics extends the PGraphics3D (better known as P3D).
After a frame is done we draw the result on a smaller image:

resized_g.beginDraw();
resized_g.image(parent.g, 0, 0, resized_g.width, resized_g.height);
resized_g.endDraw();

And then we get the pixels of the smaller image:

resized_g.loadPixels();

This avoid loadPixels on the main graphics, which can be really slow depending on the size.
However, it really screws up the renderer which makes it freeze the normal processing window.
The reason for this is that we do it in the post method, which is not safe to draw in.
But it's the only way to get it working, or to get it working without loosing a lot of speed (I can't remember).

It would be great if this could work inside the PDE as well. For this processing console would need:

• input support
• ansii support
• stty commands support (to get the size of the console window for example)

And possibly more, but I think processing users would look forward for a beter console in general.

At the time of writing this is the code that deals with the keyTyped support:

terminal_read_input_vk_keys((vk_key)-> {

            // in the processing source this is event.getModifiersEx();
            // Not sure if 0 is always fine in our case, but for now I don't need more.
            int modiefiers = 0; 
            char c_key = (char)vk_key;

            // This can probably done better, but the KeyEvent class
            // that oracle provides lacks some really usefull methods.
            // For example a static method to get the char of a VK_key...
            // https://stackoverflow.com/questions/62967633/get-char-of-vk-key
            switch (vk_key) {
                case VK_UP: 
                case VK_LEFT:
                case VK_RIGHT:
                case VK_DOWN:
                c_key = CHAR_UNDEFINED;
                break;
            }

            parent.postEvent(new KeyEvent(null, parent.millis(), KeyEvent.TYPE, modiefiers, c_key, vk_key));

        });

There are so much more keys that could be supported, but at the moment I have more pressing things to do.
Also I'm on a laptop right now and I don't want to assume things work the first time...

As described in the readme it is possible to change the character set:

P5_Terminal_Graphics.sequence = " /\\X";

But the characters have to be arranged in order of brightness.
Having a lookup table like this:

int[] char_index_to_brightness = {...};

Could help with writing code that could sort a given character set so they user could provide the characters to be used in any order they wan't.

It would be great to output to multiple terminal windows.
It seems this is the easiest to achieve on linux first.
A bit more here:

https://stackoverflow.com/questions/62943513/is-it-possible-to-output-on-multiple-terminal-windows-within-a-single-program