Why is writing to a buffer from within a fragment shader disallowed in Metal?

Writes to buffers from fragment shaders is now supported, as mentioned in What’s New in iOS 10, tvOS 10, and macOS 10.12 Function Buffer Read-Writes Available in: iOS_GPUFamily3_v2, OSX_GPUFamily1_v2 Fragment functions can now write to buffers. Writable buffers must be declared in the device address space and must not be const. Use dynamic indexing to … Read more

What does it mean by buffer?

Imagine that you’re eating candy out of a bowl. You take one piece regularly. To prevent the bowl from running out, someone might refill the bowl before it gets empty, so that when you want to take another piece, there’s candy in the bowl. The bowl acts as a buffer between you and the candy … Read more

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