Is there a way to force precompilation of SKShader()s?
I am initializing a basic shader in my SKScene properties, but the shader only gets compiled when it is actually attached and rendered to a sprite.
class GameScene: SKScene {
let myShader = SKShader(fileNamed: "myEffect.fsh")
override func update(_ currentTime: TimeInterval) {
if touches.count > 0 {
mySprite.shader = myShader
// this is where the warning triggers for the first time
}
}
}
I know this because the scene pauses for a bit, immediately before the shader is rendered for the first time, and I also get the Metal warning (which seems to also be a known bug in recent releases - https://developer.apple.com/forums/thread/661774):
[Metal Compiler Warning] Warning: Compilation succeeded with:
program_source:3:19: warning: unused variable 's'
constexpr sampler s(coord::normalized,
I was expecting the shader to compile when it is initialized with SKShader(fileNamed:), since Apple docs says:
Compiling a shader and the uniform data associated with it can be expensive. Because of this, you should:
- Initialize shader objects when your game launches, not while the game is running.
https://developer.apple.com/documentation/spritekit/skshader