Flutter Impeller
impeller::ShaderArchiveWriter Class Reference

#include <shader_archive_writer.h>

Public Member Functions

 ShaderArchiveWriter ()
 
 ~ShaderArchiveWriter ()
 
bool AddShaderAtPath (const std::string &path)
 
bool AddShader (ArchiveShaderType type, std::string name, std::shared_ptr< fml::Mapping > mapping)
 
std::shared_ptr< fml::Mapping > CreateMapping () const
 

Detailed Description

Definition at line 17 of file shader_archive_writer.h.

Constructor & Destructor Documentation

◆ ShaderArchiveWriter()

impeller::ShaderArchiveWriter::ShaderArchiveWriter ( )
default

◆ ~ShaderArchiveWriter()

impeller::ShaderArchiveWriter::~ShaderArchiveWriter ( )
default

Member Function Documentation

◆ AddShader()

bool impeller::ShaderArchiveWriter::AddShader ( ArchiveShaderType  type,
std::string  name,
std::shared_ptr< fml::Mapping >  mapping 
)

Definition at line 83 of file shader_archive_writer.cc.

85  {
86  if (name.empty() || !mapping || mapping->GetMapping() == nullptr) {
87  return false;
88  }
89 
90  shader_descriptions_.emplace_back(
91  ShaderDescription{type, std::move(name), std::move(mapping)});
92  return true;
93 }
GLenum type

References type.

Referenced by AddShaderAtPath(), and impeller::testing::TEST().

◆ AddShaderAtPath()

bool impeller::ShaderArchiveWriter::AddShaderAtPath ( const std::string &  path)

Definition at line 36 of file shader_archive_writer.cc.

36  {
37 #if FML_OS_QNX
38  return false;
39 #else // FML_OS_QNX
40  std::filesystem::path path(std_path);
41 
42  if (path.stem().empty()) {
43  FML_LOG(ERROR) << "File path stem was empty for " << path;
44  return false;
45  }
46 
47  if (path.extension() != ".gles" && path.extension() != ".vkspv") {
48  FML_LOG(ERROR) << "File path doesn't have a known shader extension "
49  << path;
50  return false;
51  }
52 
53  // Get rid of .gles
54  path = path.replace_extension();
55 
56  auto shader_type = InferShaderTypefromFileExtension(path.extension());
57 
58  if (!shader_type.has_value()) {
59  FML_LOG(ERROR) << "Could not infer shader type from file extension: "
60  << path.extension().string();
61  return false;
62  }
63 
64  // Get rid of the shader type extension (.vert, .frag, etc..).
65  path = path.replace_extension();
66 
67  const auto shader_name = path.stem().string();
68  if (shader_name.empty()) {
69  FML_LOG(ERROR) << "Shader name was empty.";
70  return false;
71  }
72 
73  auto file_mapping = fml::FileMapping::CreateReadOnly(std_path);
74  if (!file_mapping) {
75  FML_LOG(ERROR) << "File doesn't exist at path: " << path;
76  return false;
77  }
78 
79  return AddShader(shader_type.value(), shader_name, std::move(file_mapping));
80 #endif // FML_OS_QNX
81 }
bool AddShader(ArchiveShaderType type, std::string name, std::shared_ptr< fml::Mapping > mapping)
std::optional< ArchiveShaderType > InferShaderTypefromFileExtension(const std::filesystem::path &path)

References AddShader(), and impeller::InferShaderTypefromFileExtension().

Referenced by impeller::Main().

◆ CreateMapping()

std::shared_ptr< fml::Mapping > impeller::ShaderArchiveWriter::CreateMapping ( ) const

Definition at line 107 of file shader_archive_writer.cc.

107  {
108  fb::ShaderArchiveT shader_archive;
109  for (const auto& shader_description : shader_descriptions_) {
110  auto mapping = shader_description.mapping;
111  if (!mapping) {
112  return nullptr;
113  }
114  auto desc = std::make_unique<fb::ShaderBlobT>();
115  desc->name = shader_description.name;
116  desc->stage = ToStage(shader_description.type);
117  desc->mapping = {mapping->GetMapping(),
118  mapping->GetMapping() + mapping->GetSize()};
119  shader_archive.items.emplace_back(std::move(desc));
120  }
121  auto builder = std::make_shared<flatbuffers::FlatBufferBuilder>();
122  builder->Finish(fb::ShaderArchive::Pack(*builder.get(), &shader_archive),
123  fb::ShaderArchiveIdentifier());
124  return std::make_shared<fml::NonOwnedMapping>(builder->GetBufferPointer(),
125  builder->GetSize(),
126  [builder](auto, auto) {});
127 }
constexpr fb::Stage ToStage(ArchiveShaderType type)

References impeller::ToStage().

Referenced by impeller::Main(), and impeller::testing::TEST().


The documentation for this class was generated from the following files: