MTLClearColor not working

Question

todd_d OP

Created Dec ’18

Replies 3

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Views 1.8k

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Hi,

I'm trying to set a background colour for my metal scene. I'm using:

descriptor.colorAttachments[0].clearColor = MTLClearColorMake(Double(newColourComponenets.r), Double(newColourComponenets.g), Double(newColourComponenets.b), 1.0)

Construction of a background colour using MTLClearColor(r:g:b:) gives the same outcome.

When I set

descriptor.colorAttachments[0].loadAction = .load

then the background colour is rendered, but changing it to .clear means I just get a black background.

I note from here that there is a circumstance when the background colour is ignored, but due to poor writing, I can't fathom when that is. Does anyone know....?

Answered by todd_d in 344720022

Found the answer:

the MTLClearColor has to be set before the makeCommandBuffer() and makeRenderCommandEncoder(description:) is called.

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Answer 1

todd_d OP

Dec ’18

Accepted Answer

Found the answer:

the MTLClearColor has to be set before the makeCommandBuffer() and makeRenderCommandEncoder(description:) is called.

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Answer 2

Boomer_Nerd OP

Aug ’23

In 2023, I see neither clearColor nor loadAction under descriptor.colorAttachments[0]. Is there an alternative or will I just have to draw a full-screen polygon?

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Answer 3

Boomer_Nerd OP

Aug ’23

Found it! .clearColor and .loadAction are under drawInMTKView (MTLRenderPassDescriptor*).colorAttachments[0], not under _loadMetalWithView (MTLRenderPipelineDescriptor*).colorAttachments[0]

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