I not only have hard time finding tutorials, but even if I do, I have a hard time getting them to not crash, let alone working. I don't know what's the reason, but I have a suspicion that some of these are now AI generated, hence the issues of them not working or outright crashing.

I know newer APIs exist. They're way too complicated for my usecase.

I've heard about WebGPU, but I don't want to touch it with a 10 meter long pole, due to its name. I'll have a lot of time convincing people that WASM isn't a web-only thing, and me using it for scripting won't mean my game engine is either Web-based, nor that it has any Web-capability, and I only stayed with it due to my inability of finding a well-supported scripting VM without "Web" in its name.

If you ask: My game engine is currently using CPU rendering, and used to use SDL2 for displaying the output. I decided to move away from them. Managed to find some basic OpenGL tutorials when I first write my replacement for the SDL2 window handling. The Windows API is well documented on that regard, I even was able to find X11 documentations (this one even required me to find code already implementing such things, since documentation on some features was scarce). However, it somehow became increasingly difficult to find them.

Godot got a spite fork by the name "Redot" after their community managers quote-retweeted a chud calling the use of licensed game engines woke. Some people jumped onto the bandwagon, but it seems the engine is still too woke for some YouTube commentators.

Vertex:

```glsl #version 120

void main() { gl_TexCoord[0] = gl_MultiTexCoord0; gl_Position = ftransform(); } ```

Fragment:

```glsl #version 120

uniform sampler2D tex;

void main(){ vec4 texSlmp = texture2D(tex, gl_TexCoord[0].st); gl_FragColor = vec4(texSlmp.r, texSlmp.g, texSlmp.b, 1.0); } ```

All I get with this is a black screen.

I cannot seem to get tutorials for anything older than OpenGL 3.3, and for my usecase, I could go lower, except everyone tells me "OpenGL is obsolete, try Vulkan instead".

gl_TexCoord[0] seem to be all zeros if I modify the fragment shader to try to output gl_TexCoord[0].st, so its content would be displayed as color information, which I did for a different test. Also I can't find anything on how do I "pass" textures (or other values) to the shaders in the official docs, nor any of the tutorials I could find explains how that actually works.

EDIT: Target version is OpenGL 2.1/GLSL 1.20

EDIT2: I updated the shaders to GLSL 3.30, but then my DuckDuckGo search results suddenly turned bad about the subject, and in/out still doesn't work between vertex and fragment shaders (values taken from the vertex shader is all zero).

I've worked on multiple bitmap fonts, and would like to open source them in some way of form.

It was quite difficult to look up for Windows, and X11 has its own more complicated way of doing things. On X11, I've managed to enter fullscreen, but exiting is even more difficult and less documented.

I know Wayland exists, but as long as XWayland provides a good enough support, I'll use that instead for now, due to lack of time on my own side.

EDIT: To clarify: I meant how do I do it via API calls, in programming, not by what key is the default (which is F11).

Context: On the bottom one, she's shredding on the guitar, and wanted to make fun of a previous "before feminism/after feminism" meme.