Vulkan doesn't mandate whether sampling exactly in the middle between
two levels should resolve to one or the other, while D3D specifies
that it should result into sampling the higher level. llvmpipe
happens to choose the lower one instead, at least in some cases.
On virtual heaps, SRV/UAV unbounded ranges are implemented using two
descriptor sets, one for buffers and another for textures, and this case
should be tested.
Here, we implement single inheritance by inserting a field at the
beginning of the derived struct with name "$super".
For the following struct declarations
struct a
{
float4 aa;
float4 bb;
};
struct b : a
{
float4 cc;
};
struct c : b
{
float4 bb;
};
this commit generates the following:
struct a
{
float4 aa;
float4 bb;
};
struct b
{
struct a $super;
float4 cc;
};
struct c
{
struct b $super;
float4 bb;
};
This allows the Vulkan runner to execute in environments which do
not support geometry shaders, most notably MoltenVK. In particular,
that enables SM<4 shaders to run in such environments
