Vulkan support

[jclc]

Support for Vulkan functions. Compatibility with https://github.com/vulkan-go/vulkan would be very nice. Could Vulkan handles be transferred between packages as uintptrs? I'm not sure how two separate CGO-enabled packages will handle the same types.

[veeableful]

I think both packages need to type alias the handles as uintptr which requires Go 1.9. Maybe there's a hack that can be used for forcing a cast between the two types but I have no clue what the hack is..

[jclc]

This isn't quite solved yet. The only function I couldn't test properly is VulkanCreateSurface. I'll need to make sure go-sdl2 can interface with vulkan-go first. I'll probably have to change the Go wrapper function signature to take a uintptr instead of the actual Vk handle.

[Pixdigit]

Doesnt SDL support Vulkan natively?

[jclc]

It does, but you need another library to load and use the Vulkan functions.

[jclc]

My patches are now in vulkan-go/vulkan, you can test Vulkan support yourself with go get github.com/vulkan-go/demos/vulkancube/vulkancube_sdl2