d92de00cc1
This is a fairly fundamental change on how IDs are handled.
It serves many purposes:
- Improve performance. We only need to iterate over IDs which are
relevant at any one time.
- Makes sure we iterate through IDs in SPIR-V module declaration order
rather than ID space. IDs don't have to be monotonically increasing,
which was an assumption SPIRV-Cross used to have. It has apparently
never been a problem until now.
- Support LUTs of structs. We do this by interleaving declaration of
constants and struct types in SPIR-V module order.
To support this, the ParsedIR interface needed to change slightly.
Before setting any ID with variant_set<T> we let ParsedIR know
that an ID with a specific type has been added. The surface for change
should be minimal.
ParsedIR will maintain a per-type list of IDs which the cross-compiler
will need to consider for later.
Instead of looping over ir.ids[] (which can be extremely large), we loop
over types now, using:
ir.for_each_typed_id<SPIRVariable>([&](uint32_t id, SPIRVariable &var) {
handle_variable(var);
});
Now we make sure that we're never looking at irrelevant types.
33 lines
542 B
GLSL
33 lines
542 B
GLSL
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct Foo
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{
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float a;
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float b;
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};
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constant float _16[4] = { 1.0, 4.0, 3.0, 2.0 };
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constant Foo _28[2] = { Foo{ 10.0, 20.0 }, Foo{ 30.0, 40.0 } };
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struct main0_out
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{
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float4 FragColor [[color(0)]];
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};
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struct main0_in
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{
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int line [[user(locn0)]];
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};
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fragment main0_out main0(main0_in in [[stage_in]])
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{
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main0_out out = {};
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out.FragColor = float4(_16[in.line]);
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out.FragColor += float4(_28[in.line].a * _28[1 - in.line].a);
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return out;
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}
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