hasenbanck

/// While implementing a tile based light culling shader, I stumbled uppon the bachelor thesis from Jonathan W. Hale:
/// "Dual-Cone View Culling for Virtual Reality Applications" (2018). While lookin at his final version, I
/// realized that his code could be even further simplified, if the cone's tip is the origin of the coordinate system.
/// By creating a "world to cone view space" transformation matrix, that aligns the code to the positive +Z axis and
/// also set's the cone's tip as the origin, this matrix can then be used to transform the world coordinates into the
/// "cone view space". The following code uses a left handed coordinate system.
/// The test itself only uses 10 instructions:
///
/// - 2 scalar multiplications
/// - 2 additions

hasenbanck

/// Trait to extend hecs to support upsert operations.
/// ```rust
/// use Upsert;
/// let mut world = hecs::World::new();
/// struct s(u32);
///
/// world.upsert(player_entity, |mut c| c.0 = 42, s(42))?;
/// ```
pub trait Upsert {
    fn upsert<F, T: 'static>(&mut self, entity: Entity, update: F, insert: T) -> Result<()>

hasenbanck

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Stage { flag: VERTEX, error: Input { location: 4, error: WrongType } }', C:\Users\Username\.cargo\git\checkouts\wgpu-rs-40ea39809c03c5d8\7b866b1\src\backend\direct.rs:460:9

hasenbanck

This might also work for other STM32 chips. I use the HAL, so it also might be supported by your chip.

To use the Backup SRAM (most of the time 4 Kb), you need to add a backup power source (like a battery or a supercap)
to the VBAT pin of your STM32. I use a simple CR2032 battery.

Use following code to get access to the Backup SRAM:

  __HAL_RCC_PWR_CLK_ENABLE();
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_BKPSRAM_CLK_ENABLE();

hasenbanck

Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096
openssl req -new -x509 -days 365 -key ca.key -out ca.crt