Vulkan Graphics: Vulkan Portability Extension and More
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Vulkan Portability Extension 1.0 Now Shipping For Expanding Vulkan's Reach
The Vulkan Portability Extension (VK_KHR_portability_subset) has been released as part of the effort by The Khronos Group in getting Vulkan running on as many platforms as possible, including the likes of Apple macOS/iOS.
The VK_KHR_portability_subset extension is about getting Vulkan up and running on non-Vulkan APIs, as opposed to the success we have already seen in areas like getting OpenGL or Direct3D atop Vulkan. The VK_KHR_portability_subset extension makes it easier for the likes of GFX-RS and MoltenVK for getting Vulkan running on platforms like Apple's operating systems where Vulkan is not supported and thus having to reside on top of say the Apple Metal API.
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Mike Blumenkrantz: Dynamism
In Vulkan, a pipeline object is bound to the graphics pipeline for a given command buffer when a draw is about to take place. This pipeline object contains information about the draw state, and any time that state changes, a different pipeline object must be created/bound.
This is expensive.
Some time ago, Antonio Caggiano did some work to cache pipeline objects, which lets zink reuse them once they’re created. This was great, because creating Vulkan objects is very costly, and we want to always be reusing objects whenever possible.
Unfortunately, the core Vulkan spec has the number of viewports and scissor regions as both being part of the pipeline state, which means any time either one changes the number of regions (though both viewport and scissor region counts are the same for our purposes), we need a new pipeline.
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