SKShader表现放缓

本文介绍了SKShader表现放缓的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ 我需要使用SpriteKit实现自定义着色器节点。 在模拟器中一切正常。在设备（iPad第3代）上，着色器动画在前30秒内平滑，之后着色器的fps逐渐下降，直到它看起来像幻灯片（1 fps甚至更低）I need to implement a custom shader node using SpriteKit.In simulator everything is ok. On a device (iPad 3rd gen) shader animation is smooth just for first ~30 seconds, after that shader's fps are gradually falling down until it looks like a slideshow (1 fps or even less)值得注意的是，SpriteKit显示60 fps，Xcode也是如此。 CPU占用率约为75％，但着色器本身显示~1fps。It is worth noting, that SpriteKit shows 60 fps, so does Xcode.CPU is ~75% busy, but shader itself shows ~1fps.我只拥有第3代iPad而我目前没有机会测试它在其他设备上着色器代码来自wwdc会话，但问题是使用我尝试过的任何动画着色器重现的。I own only 3rd generation iPad and I currently don't have an opportunity to test it on other devicesShader code is taken from wwdc session, but the issue is reproduced with any animated shaders I've tried. Shader本身：void main(void){ float currTime = u_time; vec2 uv = v_tex_coord; vec2 circleCenter = vec2(0.5, 0.5); vec3 circleColor = vec3(0.8, 0.5, 0.7); vec3 posColor = vec3(uv, 0.5+0.5 * sin(currTime)) * circleColor; float illu = pow(1. - distance(uv, circleCenter), 4.) * 1.2; illu *= (2. + abs(0.4 + cos(currTime * -20. + 50. * distance(uv, circleCenter))/1.5)); gl_FragColor = vec4(posColor * illu * 2.0, illu * 2.0);} GameScene：GameScene:import SpriteKitclass GameScene: SKScene { override func didMoveToView(view: SKView) { addChild(shaderSprite(view.center)) } func shaderSprite(position: CGPoint) -> SKSpriteNode { let sprite = SKSpriteNode(texture: SKTexture(imageNamed: "dummy"), color: nil, size: CGSizeMake(100, 100)) sprite.shader = SKShader(fileNamed: "wwdc") sprite.position = position return sprite }}模拟器中的结果或iPad3上的前~30秒：Result in simulator or first ~30 seconds on iPad3:约2分钟后iPad3上的结果：Result on iPad3 after ~2 minutes:请指出我的错误或只是在任何其他设备上构建项目，以检查它是否是特定于设备的问题。在此先感谢。Please point my mistake or just build the project on any other device to check if it's a device-specific issue. Thanks in advance.测试项目： https：// github.com/alexburtnik/SKShaderTest推荐答案这是 u_time 的问题制服，我通过添加自己的制服浮动并使用它来代替使用 u_timeThis is an issue with the u_time uniform, I got around it by adding my own uniform float and using it instead of using u_time Shadervoid main(void) { float currTime = myUniform; ... }更新 override func update(currentTime: CFTimeInterval) { let shadedNode = self.childNodeWithName("shadedNode") as SKSpriteNode let uniform = shadedNode.shader!.uniformNamed("myUniform") uniform!.floatValue = Float(currentTime) } 这篇关于SKShader表现放缓的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！