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Use requires clauses to better disambiguate variadic and non-variadic overloads

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Suppose you try to call, say, `AddEntryPoint` with a `std::vector<Id>`
as the `interfaces` argument - something that yuzu does.  This can match
the non-variadic overload, since `std::vector<Id>` is implicitly
convertible to the argument type `std::span<const Id>`.  But it can also
match the variadic overload, and the compiler sees that as a 'better'
match because it doesn't require implicit conversion.  So it picks that
overload and promptly errors out trying to convert `std::vector<Id>` to
`Id`.

To make the compiler pick the right overload, you would have to
explicitly convert to `std::span<const Id>`, which is annoyingly
verbose.

To avoid this, add `requires` clauses to all variadic convenience
overloads, requiring each of the variadic arguments to be convertible to
the corresponding element type.  If you pass a vector/array/etc., this
rules out the variadic overload as a candidate, and the call goes
through with the non-variadic overload.

Also, use slightly different code to forward to the non-variadic
overloads, that works even if the arguments need to be converted.

Note: I used this in a WIP branch updating yuzu to the latest version of
sirit.

Note 2: I tried to run clang-format on this, but it mangled the requires
clauses pretty horribly, so I didn't accept its changes.  I googled it,
and apparently clang-format doesn't properly support concepts yet...
This commit is contained in:
comex 2020-11-25 17:18:26 -05:00 committed by Rodrigo Locatti
parent 393fccea5b
commit 13396c96ac
1 changed files with 53 additions and 24 deletions
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77
include/sirit/sirit.h
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@ -13,6 +13,7 @@
#include <span>
#include <string>
#include <string_view>
#include <type_traits>
#include <unordered_set>
#include <variant>
#include <vector>
@ -61,11 +62,14 @@ public:
std::span<const Id> interfaces = {});
/// Adds an entry point.
// TODO: Change std::is_convertible_v to std::convertible_to when compilers
// support it; same elsewhere.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
void AddEntryPoint(spv::ExecutionModel execution_model, Id entry_point, std::string_view name,
Ts&&... interfaces) {
AddEntryPoint(execution_model, std::move(entry_point), name,
std::span<const Id>{std::array{interfaces...}});
std::span<const Id>({interfaces...}));
}
/// Declare an execution mode for an entry point.
@ -74,9 +78,9 @@ public:
/// Declare an execution mode for an entry point.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Literal>)
void AddExecutionMode(Id entry_point, spv::ExecutionMode mode, Ts&&... literals) {
const Literal stack_literals[] = {std::forward<Ts>(literals)...};
AddExecutionMode(entry_point, mode, std::span<const Literal>{stack_literals});
AddExecutionMode(entry_point, mode, std::span<const Literal>({literals...}));
}
/**
@ -144,8 +148,9 @@ public:
/// Returns type struct.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id TypeStruct(Ts&&... members) {
return TypeStruct(std::span<const Id>{std::array{members...}});
return TypeStruct(std::span<const Id>({members...}));
}
/// Returns type opaque.
@ -159,8 +164,9 @@ public:
/// Returns type function.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id TypeFunction(Id return_type, Ts&&... arguments) {
return TypeFunction(return_type, std::span<const Id>{std::array{arguments...}});
return TypeFunction(return_type, std::span<const Id>({arguments...}));
}
/// Returns type event.
@ -194,8 +200,9 @@ public:
/// Returns a numeric scalar constant.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id ConstantComposite(Id result_type, Ts&&... constituents) {
return ConstantComposite(result_type, std::span<const Id>{std::array{constituents...}});
return ConstantComposite(result_type, std::span<const Id>({constituents...}));
}
/// Returns a sampler constant.
@ -218,8 +225,9 @@ public:
/// Call a function.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpFunctionCall(Id result_type, Id function, Ts&&... arguments) {
return OpFunctionCall(result_type, function, std::span<const Id>{std::array{arguments...}});
return OpFunctionCall(result_type, function, std::span<const Id>({arguments...}));
}
// Flow
@ -230,10 +238,11 @@ public:
/// Declare a structured loop.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpLoopMerge(Id merge_block, Id continue_target, spv::LoopControlMask loop_control,
Ts&&... literals) {
return OpLoopMerge(merge_block, continue_target, loop_control,
std::span<const Id>{std::array{literals...}});
std::span<const Id>({literals...}));
}
/// Declare a structured selection.
@ -301,8 +310,9 @@ public:
/// Create a pointer into a composite object that can be used with OpLoad and OpStore.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpAccessChain(Id result_type, Id base, Ts&&... indexes) {
return OpAccessChain(result_type, base, std::span<const Id>{std::array{indexes...}});
return OpAccessChain(result_type, base, std::span<const Id>({indexes...}));
}
/// Extract a single, dynamically selected, component of a vector.
@ -317,6 +327,7 @@ public:
/// Make a copy of a composite object, while modifying one part of it.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Literal>)
Id OpCompositeInsert(Id result_type, Id object, Id composite, Ts&&... indexes) {
const Literal stack_indexes[] = {std::forward<Ts>(indexes)...};
return OpCompositeInsert(result_type, object, composite,
@ -328,6 +339,7 @@ public:
/// Extract a part of a composite object.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Literal>)
Id OpCompositeExtract(Id result_type, Id composite, Ts&&... indexes) {
const Literal stack_indexes[] = {std::forward<Ts>(indexes)...};
return OpCompositeExtract(result_type, composite, std::span<const Literal>{stack_indexes});
@ -338,8 +350,9 @@ public:
/// Construct a new composite object from a set of constituent objects that will fully form it.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpCompositeConstruct(Id result_type, Ts&&... ids) {
return OpCompositeConstruct(result_type, std::span<const Id>{std::array{ids...}});
return OpCompositeConstruct(result_type, std::span<const Id>({ids...}));
}
// Annotation
@ -349,6 +362,7 @@ public:
/// Add a decoration to target.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Literal>)
Id Decorate(Id target, spv::Decoration decoration, Ts&&... literals) {
const Literal stack_literals[] = {std::forward<Ts>(literals)...};
return Decorate(target, decoration, std::span<const Literal>{stack_literals});
@ -358,6 +372,7 @@ public:
std::span<const Literal> literals = {});
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Literal>)
Id MemberDecorate(Id structure_type, Literal member, spv::Decoration decoration,
Ts&&... literals) {
const Literal stack_literals[] = {std::forward<Ts>(literals)...};
@ -621,9 +636,10 @@ public:
/// Execute an instruction in an imported set of extended instructions.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpExtInst(Id result_type, Id set, std::uint32_t instruction, Ts&&... operands) {
return OpExtInst(result_type, set, instruction,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Result is x if x >= 0; otherwise result is -x.
@ -777,10 +793,11 @@ public:
/// Sample an image with an implicit level of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleImplicitLod(Id result_type, Id sampled_image, Id coordinate,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleImplicitLod(result_type, sampled_image, coordinate, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image using an explicit level of detail.
@ -790,10 +807,11 @@ public:
/// Sample an image using an explicit level of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleExplicitLod(Id result_type, Id sampled_image, Id coordinate,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleExplicitLod(result_type, sampled_image, coordinate, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image doing depth-comparison with an implicit level of detail.
@ -803,11 +821,12 @@ public:
/// Sample an image doing depth-comparison with an implicit level of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleDrefImplicitLod(Id result_type, Id sampled_image, Id coordinate, Id dref,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleDrefImplicitLod(result_type, sampled_image, coordinate, dref,
image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image doing depth-comparison using an explicit level of detail.
@ -817,11 +836,12 @@ public:
/// Sample an image doing depth-comparison using an explicit level of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleDrefExplicitLod(Id result_type, Id sampled_image, Id coordinate, Id dref,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleDrefExplicitLod(result_type, sampled_image, coordinate, dref,
image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image with with a project coordinate and an implicit level of detail.
@ -831,10 +851,11 @@ public:
/// Sample an image with with a project coordinate and an implicit level of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleProjImplicitLod(Id result_type, Id sampled_image, Id coordinate,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleProjImplicitLod(result_type, sampled_image, coordinate, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image with a project coordinate using an explicit level of detail.
@ -844,10 +865,11 @@ public:
/// Sample an image with a project coordinate using an explicit level of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleProjExplicitLod(Id result_type, Id sampled_image, Id coordinate,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleProjExplicitLod(result_type, sampled_image, coordinate, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image with a project coordinate, doing depth-comparison, with an implicit level of
@ -859,11 +881,12 @@ public:
/// Sample an image with a project coordinate, doing depth-comparison, with an implicit level of
/// detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleProjDrefImplicitLod(Id result_type, Id sampled_image, Id coordinate, Id dref,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleProjDrefImplicitLod(result_type, sampled_image, coordinate, dref,
image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Sample an image with a project coordinate, doing depth-comparison, using an explicit level
@ -875,11 +898,12 @@ public:
/// Sample an image with a project coordinate, doing depth-comparison, using an explicit level
/// of detail.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageSampleProjDrefExplicitLod(Id result_type, Id sampled_image, Id coordinate, Id dref,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageSampleProjDrefExplicitLod(result_type, sampled_image, coordinate, dref,
image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Fetch a single texel from an image whose Sampled operand is 1.
@ -889,10 +913,11 @@ public:
/// Fetch a single texel from an image whose Sampled operand is 1.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageFetch(Id result_type, Id sampled_image, Id coordinate,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageFetch(result_type, sampled_image, coordinate, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Gathers the requested component from four texels.
@ -902,10 +927,11 @@ public:
/// Gathers the requested component from four texels.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageGather(Id result_type, Id sampled_image, Id coordinate, Id component,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageGather(result_type, sampled_image, coordinate, component, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Gathers the requested depth-comparison from four texels.
@ -915,10 +941,11 @@ public:
/// Gathers the requested depth-comparison from four texels.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageDrefGather(Id result_type, Id sampled_image, Id coordinate, Id dref,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageDrefGather(result_type, sampled_image, coordinate, dref, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Read a texel from an image without a sampler.
@ -928,10 +955,11 @@ public:
/// Read a texel from an image without a sampler.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageRead(Id result_type, Id sampled_image, Id coordinate,
spv::ImageOperandsMask image_operands, Ts&&... operands) {
return OpImageRead(result_type, sampled_image, coordinate, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Write a texel to an image without a sampler.
@ -941,10 +969,11 @@ public:
/// Write a texel to an image without a sampler.
template <typename... Ts>
requires (... && std::is_convertible_v<Ts, Id>)
Id OpImageWrite(Id image, Id coordinate, Id texel, spv::ImageOperandsMask image_operands,
Ts&&... operands) {
return OpImageWrite(image, coordinate, texel, image_operands,
std::span<const Id>{std::array{operands...}});
std::span<const Id>({operands...}));
}
/// Extract the image from a sampled image.