Questions tagged [metal]

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1answer
146 views

How to capture frames in a MacOS MTKView for recording to a video

I have created a 3D model of a local outdoor performance space and I have an app that uses Metal on MacOS 10.14.2 to display the model. I want to create an animation by flying the camera around the ...
1
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0answers
25 views

What is best way to use wavefront material file color parameter Kd to set vertex color in MetalKit submeshes?

I am developing a MacOS program using MacOS MetalKit and ModelIO. The ultimate goal is to use the 3D model to analyze the acoustic properties of a performance space. Initially I'm just creating a ...
4
votes
1answer
831 views

What are Metal and Vulcan?

I keep coming across the terms 'Metal' and 'Vulcan' on this site. Guessing this to be some CG software, I'm interested to know what these are exactly and what the intended and most common usage is. A ...
1
vote
1answer
41 views

Are the benefits of a Metal early depth test limited to one draw call

I should preface with currently this question is mostly asking about Metal and iOS GPUs. That being said if this is GPU or OS specific and you can go into detail about other platforms that would be ...
6
votes
1answer
122 views

Same draw call causing extremely different GPU usage under different triangle orders

So I have a bit of a predicament I am trying to solve. I have 10,000 triangle strips I am trying to draw. Each one has a z-order for the entire strip and within each strip the most recent triangles ...
1
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0answers
53 views

Sorting my geometry for alpha testing

Here is my predicament. I am trying to draw a multitude of dots that leave trails behind them real time. Heres the difficulty, that line fades. Each dot line has a defined z position and the goal ...
2
votes
2answers
440 views

How to perform additive blending in Metal. What do these terms mean?

Forgive me, I dont really understand the basis of alpha blending. Like I know the formula but when it comes to the terms blending operation, source blend factor, and destination blend factor I am ...
0
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0answers
103 views

Sharing a MTLCommandBuffer across multiple MTKViews

I am using MTKViews for select UI elements inside of my UIKit app. I have a central metal controller that does something somewhat like this: ...
3
votes
2answers
1k views

MTLTexture getBytes returning blank image

Inside of my application I am trying to convert a MTLTexture into a CGImage or CIimage for use in other parts of the app. I am having a difficult time doing so because none of the example code I find ...
2
votes
2answers
869 views

Passing parameters in Metal Compute Kernel using Swift 4

On the CPU side, I have a structure I want to pass to the compute kernel: ...
1
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0answers
130 views

Triple buffering without buffers?

Metal Best Practices Guide states that The setVertexBytes:length:atIndex: method is the best option for binding a very small amount (less than 4 KB) of dynamic buffer data to a vertex function I ...
3
votes
1answer
192 views

Mipmap sampler in Metal compute kernel (not vertex or fragment shader)

I have a source texture (480x480) that was created with mipmapped set to true (error checking removed to simply this post), and a dest texture (100x100): ...
6
votes
1answer
119 views

How do you design the code of a graphics engine to target multiple frameworks

I am starting to think about how I can make my app (currently written in Metal) available on older device that dont have Metal as well as Android. This is a predicament because while I could write two ...
1
vote
0answers
142 views

How to format a vertex layout descriptor (MTLVertexBufferLayoutDescriptor) for this scenario

I am having a lot of trouble understanding what the difference between a layout and a descriptor is inside of a MTLVertexBufferLayoutDescriptor object. I am hoping to create a layout descriptor that ...