Velocity based on delta time is inconsistent with framerates

[Hex4dec]

I have some movement code that applies friction to/decays X velocity (player->velocity.x = expdy(player->velocity.x, 0, 20, delta);, where expdy(a, b, decay, dt) is the exponential decay function, TL;DR smooth curve), adds to the velocity when the player presses keys (IsKeyDown(KEY_LEFT) -> player->velocity.x -= 80;), and adds it to the position scaled by delta (player->pos = Vector2Add(player->pos, Vector2Scale(player->velocity, delta));.

This is done before using a drawing function such as BeginDrawing() or BeginTextureMode(), but still in the process loop. I have seperated functions for processing and drawing. Why is this still framerate-dependent when I'm simulating an unstable FPS with SetTargetFPS()?

It seems to work as expected when I add directly to player->pos, which is even stranger.

This is most probably a stupid question, and I'm missing something very obvious.

[casperbear]

The phrase "Why is this still framerate-dependent when I'm simulating an unstable FPS with SetTargetFPS()?" is probably pointing to a misunderstanding about SetTargetFPS. Please see an answer to a similar question here #4201 (comment)

[Hex4dec]

Sorry, forgot to answer this. I fixed it by squaring delta in some places, acceleration is weird.