AuroraMiddleware/SPIRV-Cross
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Fix get_declared_struct_member_size for struct members

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When a member of a struct is a struct, get_declared_struct_member_size
instead returned the size of the entire outer struct because it added
the offset of the last field to the size of the last field.

Restructure the function so that it handles all arrays in the same way
(by using array stride) and for the rest reuses get_declared_struct_size
if possible - this simplifies the function and fixes the issue.
This commit is contained in:
Arseny Kapoulkine 2017-01-17 01:52:12 -08:00
parent a3bac9e4ce
commit f63e7c5c98
1 changed files with 33 additions and 47 deletions
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80
spirv_cross.cpp
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@ -2058,63 +2058,49 @@ size_t Compiler::get_declared_struct_member_size(const SPIRType &struct_type, ui
auto flags = get_member_decoration_mask(struct_type.self, index);
auto &type = get<SPIRType>(struct_type.member_types[index]);
if (type.basetype != SPIRType::Struct)
switch (type.basetype)
{
switch (type.basetype)
{
case SPIRType::Unknown:
case SPIRType::Void:
case SPIRType::Boolean: // Bools are purely logical, and cannot be used for externally visible types.
case SPIRType::AtomicCounter:
case SPIRType::Image:
case SPIRType::SampledImage:
case SPIRType::Sampler:
SPIRV_CROSS_THROW("Querying size for object with opaque size.\n");
case SPIRType::Unknown:
case SPIRType::Void:
case SPIRType::Boolean: // Bools are purely logical, and cannot be used for externally visible types.
case SPIRType::AtomicCounter:
case SPIRType::Image:
case SPIRType::SampledImage:
case SPIRType::Sampler:
SPIRV_CROSS_THROW("Querying size for object with opaque size.\n");
default:
break;
}
default:
break;
}
if (!type.array.empty())
{
// For arrays, we can use ArrayStride to get an easy check.
return type_struct_member_array_stride(struct_type, index) * type.array.back();
}
else if (type.basetype == SPIRType::Struct)
{
return get_declared_struct_size(type);
}
else
{
size_t component_size = type.width / 8;
unsigned vecsize = type.vecsize;
unsigned columns = type.columns;
if (type.array.empty())
{
// Vectors.
if (columns == 1)
return vecsize * component_size;
else
{
// Per SPIR-V spec, matrices must be tightly packed and aligned up for vec3 accesses.
if ((flags & (1ull << DecorationRowMajor)) && columns == 3)
columns = 4;
else if ((flags & (1ull << DecorationColMajor)) && vecsize == 3)
vecsize = 4;
return vecsize * columns * component_size;
}
}
// Vectors.
if (columns == 1)
return vecsize * component_size;
else
{
// For arrays, we can use ArrayStride to get an easy check.
return type_struct_member_array_stride(struct_type, index) * type.array.back();
}
}
else
{
// Recurse.
uint32_t last = uint32_t(struct_type.member_types.size() - 1);
uint32_t offset = type_struct_member_offset(struct_type, last);
size_t size;
// Per SPIR-V spec, matrices must be tightly packed and aligned up for vec3 accesses.
if ((flags & (1ull << DecorationRowMajor)) && columns == 3)
columns = 4;
else if ((flags & (1ull << DecorationColMajor)) && vecsize == 3)
vecsize = 4;
// If we have an array of structs inside our struct, handle that with array strides instead.
auto &last_type = get<SPIRType>(struct_type.member_types.back());
if (last_type.array.empty())
size = get_declared_struct_size(last_type);
else
size = type_struct_member_array_stride(struct_type, last) * last_type.array.back();
return offset + size;
return vecsize * columns * component_size;
}
}
}