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MSL: Ensure discrete runtime arrays of buffers have known length.

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An entry-point array of buffers, that is not part of a Metal argument
buffer, requires a known length, so it can be emitted as discrete buffers.
For runtime arrays of resources, this can be retrieved from the resource
binding information added via add_msl_resource_binding().

- Redefine get_resource_array_size() to consolidate array sizing using both var
  type, and runtime array sizing from resource bindings, if not found in type.
- Use get_resource_array_size() to fix issue for runtime arrays of buffers.
- Update runtime arrays of images and samplers to use get_resource_array_size().
- Add .DS_Store to .gitignore (unrelated).
This commit is contained in:
Bill Hollings 2023-12-22 09:12:44 -05:00
parent f349c91274
commit d47183c0db
3 changed files with 19 additions and 19 deletions
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3
.gitignore vendored
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@ -21,5 +21,8 @@
.vs/
*.vcxproj.user
# Mac OS X Finder
.DS_Store
!CMakeLists.txt
!LICENSES/*.txt

33
spirv_msl.cpp
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@ -191,13 +191,19 @@ bool CompilerMSL::is_msl_resource_binding_used(ExecutionModel model, uint32_t de
bool CompilerMSL::is_var_runtime_size_array(const SPIRVariable &var) const
{
return is_runtime_size_array(get_variable_data_type(var)) && get_resource_array_size(var.self) == 0;
auto& type = get_variable_data_type(var);
return is_runtime_size_array(type) && get_resource_array_size(type, var.self) == 0;
}
// Returns the size of the array of resources used by the variable with the specified id.
// The returned value is retrieved from the resource binding added using add_msl_resource_binding().
uint32_t CompilerMSL::get_resource_array_size(uint32_t id) const
// Returns the size of the array of resources used by the variable with the specified type and id.
// The size is first retrieved from the type, but in the case of runtime array sizing,
// the size is retrieved from the resource binding added using add_msl_resource_binding().
uint32_t CompilerMSL::get_resource_array_size(const SPIRType &type, uint32_t id) const
{
uint32_t array_size = to_array_size_literal(type);
if (array_size)
return array_size;
StageSetBinding tuple = { get_entry_point().model, get_decoration(id, DecorationDescriptorSet),
get_decoration(id, DecorationBinding) };
auto itr = resource_bindings.find(tuple);
@ -1399,7 +1405,8 @@ void CompilerMSL::emit_entry_point_declarations()
statement(get_argument_address_space(var), " ", type_to_glsl(buffer_type), "* ",
to_restrict(var.self, true), name, "[] =");
begin_scope();
for (uint32_t i = 0; i < to_array_size_literal(type); ++i)
uint32_t array_size = get_resource_array_size(type, var.self);
for (uint32_t i = 0; i < array_size; ++i)
statement(name, "_", i, ",");
end_scope_decl();
statement_no_indent("");
@ -13410,11 +13417,6 @@ void CompilerMSL::entry_point_args_discrete_descriptors(string &ep_args)
if (type.array.size() > 1)
SPIRV_CROSS_THROW("Arrays of arrays of buffers are not supported.");
// Metal doesn't directly support this, so we must expand the
// array. We'll declare a local array to hold these elements
// later.
uint32_t array_size = to_array_size_literal(type);
is_using_builtin_array = true;
if (is_var_runtime_size_array(var))
{
@ -13442,6 +13444,7 @@ void CompilerMSL::entry_point_args_discrete_descriptors(string &ep_args)
}
else
{
uint32_t array_size = get_resource_array_size(type, var_id);
for (uint32_t i = 0; i < array_size; ++i)
{
if (!ep_args.empty())
@ -15342,10 +15345,7 @@ std::string CompilerMSL::sampler_type(const SPIRType &type, uint32_t id)
// Arrays of samplers in MSL must be declared with a special array<T, N> syntax ala C++11 std::array.
// If we have a runtime array, it could be a variable-count descriptor set binding.
uint32_t array_size = to_array_size_literal(type);
if (array_size == 0)
array_size = get_resource_array_size(id);
uint32_t array_size = get_resource_array_size(type, id);
if (array_size == 0)
{
add_spv_func_and_recompile(SPVFuncImplVariableDescriptor);
@ -15395,10 +15395,7 @@ string CompilerMSL::image_type_glsl(const SPIRType &type, uint32_t id)
// Arrays of images in MSL must be declared with a special array<T, N> syntax ala C++11 std::array.
// If we have a runtime array, it could be a variable-count descriptor set binding.
uint32_t array_size = to_array_size_literal(type);
if (array_size == 0)
array_size = get_resource_array_size(id);
uint32_t array_size = get_resource_array_size(type, id);
if (array_size == 0)
{
add_spv_func_and_recompile(SPVFuncImplVariableDescriptor);

2
spirv_msl.hpp
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@ -977,7 +977,7 @@ protected:
void emit_interface_block(uint32_t ib_var_id);
bool maybe_emit_array_assignment(uint32_t id_lhs, uint32_t id_rhs);
bool is_var_runtime_size_array(const SPIRVariable &var) const;
uint32_t get_resource_array_size(uint32_t id) const;
uint32_t get_resource_array_size(const SPIRType &type, uint32_t id) const;
void fix_up_shader_inputs_outputs();