SPIRV-Cross/reference/shaders/vulkan/vert/device-group.nocompat.vk.vert.vk

#version 450
#extension GL_EXT_device_group : require

void main()
{
    gl_Position = vec4(float(gl_DeviceIndex));
}
Support the SPV_KHR_device_group extension. The only piece added by this extension is the `DeviceIndex` builtin, which tells the shader which device in a grouped logical device it is running on. Metal's pipeline state objects are owned by the `MTLDevice` that created them. Since Metal doesn't support logical grouping of devices the way Vulkan does, we'll thus have to create a pipeline state for each device in a grouped logical device. The upcoming peer group support in Metal 3 will not change this. For this reason, for Metal, the device index is supplied as a constant at pipeline compile time. There's an interaction between `VK_KHR_device_group` and `VK_KHR_multiview` in the `VK_PIPELINE_CREATE_VIEW_INDEX_FROM_DEVICE_INDEX_BIT`, which defines the view index to be the same as the device index. The new `view_index_from_device_index` MSL option supports this functionality. 2019-07-13 02:50:50 +00:00			`#version 450`
			`#extension GL_EXT_device_group : require`

			`void main()`
			`{`
			`gl_Position = vec4(float(gl_DeviceIndex));`
			`}`