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Clarify CompileMSL config parameters and move to compile() function.

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CompileMSL supports marking vertex attributes and resource bindings
as to whether they are used by the shader, and feeding back to caller.
This commit is contained in:
Bill Hollings 2016-04-07 21:25:51 -04:00
parent 103aabf5e8
commit 8f30f07eb5
2 changed files with 138 additions and 92 deletions
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172
spirv_msl.cpp
View File

@ -22,35 +22,85 @@ using namespace spv;
using namespace spirv_cross;
using namespace std;
CompilerMSL::CompilerMSL(std::vector<uint32_t> spirv,
MSLOptions* p_msl_options,
vector<MSLVertexAttr>* p_vtx_attrs,
std::vector<MSLResourceBinding>* p_res_bindings) : CompilerGLSL(move(spirv)) {
CompilerMSL::CompilerMSL(vector<uint32_t> spirv) : CompilerGLSL(move(spirv)) {
options.vertex.fixup_clipspace = false;
if (p_msl_options)
msl_options = *p_msl_options;
if (p_vtx_attrs)
for (auto& va : *p_vtx_attrs)
vtx_attrs_by_location[va.location] = va;
if (p_res_bindings)
resource_bindings = *p_res_bindings;
post_parse();
}
// Perform additional configuration after parsing
void CompilerMSL::post_parse()
string CompilerMSL::compile(MSLOptions& msl_opts,
vector<MSLVertexAttr>* p_vtx_attrs,
std::vector<MSLResourceBinding>* p_res_bindings)
{
next_metal_resource_index.msl_buffer = 0;
next_metal_resource_index.msl_texture = 0;
next_metal_resource_index.msl_sampler = 0;
pad_type_ids_by_pad_len.clear();
msl_options = msl_opts;
vtx_attrs_by_location.clear();
if (p_vtx_attrs)
for (auto& va : *p_vtx_attrs) {
va.used_by_shader = false;
vtx_attrs_by_location[va.location] = &va;
}
resource_bindings.clear();
if (p_res_bindings) {
resource_bindings.reserve(p_vtx_attrs->size());
for (auto& rb : *p_res_bindings) {
rb.used_by_shader = false;
resource_bindings.push_back(&rb);
}
}
extract_builtins();
add_interface_structs();
// Do not deal with ES-isms like precision, older extensions and such.
options.es = false;
options.version = 1;
backend.float_literal_suffix = false;
backend.uint32_t_literal_suffix = true;
backend.basic_int_type = "int";
backend.basic_uint_type = "uint";
backend.swizzle_is_function = false;
backend.shared_is_implied = false;
uint32_t pass_count = 0;
do
{
if (pass_count >= 2)
throw CompilerError("Over 2 compilation loops detected. Must be a bug!");
reset();
// Move constructor for this type is broken on GCC 4.9 ...
buffer = unique_ptr<ostringstream>(new ostringstream());
emit_header();
emit_resources();
emit_function_declarations();
emit_function(get<SPIRFunction>(execution.entry_point), 0);
pass_count++;
} while (force_recompile);
return buffer->str();
}
string CompilerMSL::compile()
{
MSLOptions default_msl_opts;
compile(default_msl_opts, nullptr, nullptr);
}
// Adds any builtins used by this shader to the builtin_vars collection
void CompilerMSL::extract_builtins()
{
builtin_vars.clear();
for (auto& id : ids)
{
if (id.get_type() == TypeVariable)
@ -67,6 +117,9 @@ void CompilerMSL::extract_builtins()
// Adds any interface structure variables needed by this shader
void CompilerMSL::add_interface_structs()
{
stage_in_var_ids.clear();
qual_pos_var_name = "";
uint32_t var_id;
if (execution.model == ExecutionModelVertex)
{
@ -89,8 +142,9 @@ void CompilerMSL::add_interface_structs()
stage_out_var_id = add_interface_struct(StorageClassOutput);
}
// Iterate through the variables and populate each input vertex attribute variable to
// the binding info provided in the MSL context. Matching occurs by location.
// Iterate through the variables and populates each input vertex attribute variable
// from the binding info provided during compiler construction, matching by location.
// The MSL Each matched binding
void CompilerMSL::bind_vertex_attributes(std::set<uint32_t>& bindings)
{
if (execution.model == ExecutionModelVertex)
@ -108,13 +162,17 @@ void CompilerMSL::bind_vertex_attributes(std::set<uint32_t>& bindings)
type.pointer)
{
auto& dec = meta[var.self].decoration;
MSLVertexAttr& va = vtx_attrs_by_location[dec.location];
dec.binding = va.buffer;
dec.offset = va.offset;
dec.array_stride = va.stride;
dec.per_instance = va.per_instance;
MSLVertexAttr* p_va = vtx_attrs_by_location[dec.location];
if (p_va) {
dec.binding = p_va->msl_buffer;
dec.offset = p_va->msl_offset;
dec.array_stride = p_va->msl_stride;
dec.per_instance = p_va->per_instance;
bindings.insert(va.buffer);
// Mark the vertex attributes that were used.
p_va->used_by_shader = true;
bindings.insert(p_va->msl_buffer);
}
}
}
}
@ -301,40 +359,6 @@ uint32_t CompilerMSL::add_interface_struct(StorageClass storage, uint32_t vtx_bi
return ib_var_id;
}
string CompilerMSL::compile()
{
// Do not deal with ES-isms like precision, older extensions and such.
options.es = false;
options.version = 1;
backend.float_literal_suffix = false;
backend.uint32_t_literal_suffix = true;
backend.basic_int_type = "int";
backend.basic_uint_type = "uint";
backend.swizzle_is_function = false;
backend.shared_is_implied = false;
uint32_t pass_count = 0;
do
{
if (pass_count >= 2)
throw CompilerError("Over 2 compilation loops detected. Must be a bug!");
reset();
// Move constructor for this type is broken on GCC 4.9 ...
buffer = unique_ptr<ostringstream>(new ostringstream());
emit_header();
emit_resources();
emit_function_declarations();
emit_function(get<SPIRFunction>(execution.entry_point), 0);
pass_count++;
} while (force_recompile);
return buffer->str();
}
// Emits the file header info
void CompilerMSL::emit_header()
{
@ -1082,26 +1106,30 @@ uint32_t CompilerMSL::get_metal_resource_index(SPIRVariable& var, SPIRType::Base
uint32_t var_binding = (var.storage == StorageClassPushConstant) ? kPushConstBinding : var_dec.binding;
// If a matching binding has been specified, find and use it
for (auto& res_bind : resource_bindings)
for (auto p_res_bind : resource_bindings)
{
if (res_bind.stage == execution.model &&
res_bind.desc_set == var_desc_set &&
res_bind.binding == var_binding) {
if (p_res_bind->stage == execution.model &&
p_res_bind->desc_set == var_desc_set &&
p_res_bind->binding == var_binding)
{
switch (basetype) {
case SPIRType::Struct: return res_bind.buffer;
case SPIRType::Image: return res_bind.texture;
case SPIRType::Sampler: return res_bind.sampler;
p_res_bind->used_by_shader = true;
switch (basetype)
{
case SPIRType::Struct: return p_res_bind->msl_buffer;
case SPIRType::Image: return p_res_bind->msl_texture;
case SPIRType::Sampler: return p_res_bind->msl_sampler;
default: return 0;
}
}
}
// If a binding has not been specified, revert to incrementing resource indices
switch (basetype) {
case SPIRType::Struct: return next_metal_resource_index.buffer++;
case SPIRType::Image: return next_metal_resource_index.texture++;
case SPIRType::Sampler: return next_metal_resource_index.sampler++;
switch (basetype)
{
case SPIRType::Struct: return next_metal_resource_index.msl_buffer++;
case SPIRType::Image: return next_metal_resource_index.msl_texture++;
case SPIRType::Sampler: return next_metal_resource_index.msl_sampler++;
default: return 0;
}
}

58
spirv_msl.hpp
View File

@ -45,29 +45,35 @@ namespace spirv_cross {
bool is_rendering_points = false;
};
// Defines characteristics of vertex attributes at a particular location
// Defines MSL characteristics of a vertex attribute at a particular location.
// The used_by_shader flag is set to true during compilation of SPIR-V to MSL
// if the shader makes use of this vertex attribute.
struct MSLVertexAttr
{
uint32_t location = 0;
uint32_t buffer = 0;
uint32_t offset = 0;
uint32_t stride = 0;
uint32_t msl_buffer = 0;
uint32_t msl_offset = 0;
uint32_t msl_stride = 0;
bool per_instance = false;
bool used_by_shader = false;
};
// Specifies the binding index of a Metal resource for a binding within a descriptor set.
// Matches the binding index of a MSL resource for a binding within a descriptor set.
// Taken together, the stage, desc_set and binding combine to form a reference to a resource
// descriptor used in a particular shading stage. Generally, only one of the buffer, texture,
// or sampler elements will be populated.
// or sampler elements will be populated. The used_by_shader flag is set to true during
// compilation of SPIR-V to MSL if the shader makes use of this vertex attribute.
struct MSLResourceBinding
{
spv::ExecutionModel stage;
uint32_t desc_set = 0;
uint32_t binding = 0;
uint32_t buffer = 0;
uint32_t texture = 0;
uint32_t sampler = 0;
uint32_t msl_buffer = 0;
uint32_t msl_texture = 0;
uint32_t msl_sampler = 0;
bool used_by_shader = false;
};
// Special constant used in a MSLResourceBinding desc_set
@ -84,12 +90,25 @@ namespace spirv_cross {
{
public:
CompilerMSL(std::vector<uint32_t> spirv,
MSLOptions* p_msl_options = nullptr,
std::vector<MSLVertexAttr>* p_vtx_attrs = nullptr,
std::vector<MSLResourceBinding>* p_res_bindings = nullptr);
// Constructs an instance to compile the SPIR-V code into Metal Shading Language.
CompilerMSL(std::vector<uint32_t> spirv);
std::string compile() override;
// Compiles the SPIR-V code into Metal Shading Language using the specified configuration parameters.
// - msl_opts indicates some general options for directing the compilation.
// - p_vtx_attrs is an optional list of vertex attribute bindings used to match
// vertex content locations to MSL attributes. If vertex attributes are provided,
// the compiler will set the used_by_shader flag to true in any vertex attribute
// actually used by the MSL code.
// - p_res_bindings is a list of resource bindings to indicate the MSL buffer,
// texture or sampler index to use for a particular SPIR-V description set
// and binding. If resource bindings are provided, the compiler will set the
// used_by_shader flag to true in any resource binding actually used by the MSL code.
std::string compile(MSLOptions& msl_opts,
std::vector<MSLVertexAttr>* p_vtx_attrs = nullptr,
std::vector<MSLResourceBinding>* p_res_bindings = nullptr);
// Compiles the SPIR-V code into Metal Shading Language using default configuration parameters.
std::string compile() override;
protected:
void emit_header() override;
@ -130,18 +149,17 @@ namespace spirv_cross {
size_t get_declared_type_size(const SPIRType& type, uint64_t dec_mask) const;
MSLOptions msl_options;
std::unordered_map<uint32_t, MSLVertexAttr> vtx_attrs_by_location;
std::vector<MSLResourceBinding> resource_bindings;
std::unordered_map<uint32_t, MSLVertexAttr*> vtx_attrs_by_location;
std::vector<MSLResourceBinding*> resource_bindings;
std::unordered_map<spv::BuiltIn, uint32_t> builtin_vars;
MSLResourceBinding next_metal_resource_index;
std::unordered_map<uint32_t, uint32_t> pad_type_ids_by_pad_len;
std::string stage_in_var_name = "in";
std::vector<uint32_t> stage_in_var_ids;
std::string stage_out_var_name = "out";
uint32_t stage_out_var_id = 0;
std::string sampler_name_suffix = "Smplr";
std::string qual_pos_var_name;
std::string stage_in_var_name = "in";
std::string stage_out_var_name = "out";
std::string sampler_name_suffix = "Smplr";
};
// Sorts the members of a SPIRType and associated Meta info based on the location