owennguyen3162 / camera_metal_pro

Swift Metal Camera / iOS Metal Video Generator / Metal Image Generation

You are here because you want to...

1. How to upload camera feed direct to metal kernel/fragment functions.
2. Give a start with basic Still Image Texture / Camera Metal Texture loading/processing in iOS graphics using metal API(s).
3. Read a MTLTexture buffer, Then use the buffer to create a CVPixelBuffer/UIImage and whatever you like.
4. If you are frustrated to understand the metal kernel functionalities and how it should be calculated; then please give a look to this official document from Apple: https://developer.apple.com/documentation/metal/setting_up_a_command_structure
5. If you would like to read more from the following link then it will be easier to understand the basic of Metal GPU pipeline: https://developer.apple.com/documentation/metal/setting_up_a_command_structure
6. Metal shaders for blending and applying effects

Basic is grabbed from here :: https://github.com/navoshta/MetalRenderCamera

I grabbed camera session, metal texture cache creation and other setup related code from here. I perform subclassing for MTLCommandEncoder class. I subclassed AVAssetWriter to generate video from MTLTexture. Here are some important notes about the metal rendering process

1. Metal Texture used for rendering in MTLView is not suitable for generating video/still image.
2. MTLComputeCommandEncoder is used to process camera feed in metal kernel function.
3. The output is written to an internal texture for rendering and later video/image generation.
4. Kernel function subclassing for applying the different effect in live iOS camera stream.
5. If you would like to add some custom metal effects you my subclass BaseKernelPipelineState and override processArguments(computeEncode:) method.

• Any Contribution and Suggestion about metal will be highly appreciated.

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Camera_Metal_Pro