| Flutter Impeller |

Public Member Functions | Static Public Member Functions | Public Attributes | List of all members
impeller::compiler::Switches Class Reference

`#include <switches.h>`

## Public Member Functions
| Switches ()
| ~Switches ()
| Switches (const fml::CommandLine &command_line)
bool | AreValid (std::ostream &explain) const
std::vector< TargetPlatform > | PlatformsToCompile () const
| A vector containing at least one valid platform. More...
TargetPlatform | SelectDefaultTargetPlatform () const
SourceOptions | CreateSourceOptions (std::optional< TargetPlatform > target_platform=std::nullopt) const

## Static Public Member Functions
static void | PrintHelp (std::ostream &stream)

## Public Attributes
std::shared_ptr< fml::UniqueFD > | working_directory = nullptr
std::vector< IncludeDir > | include_directories = {}
std::string | source_file_name = ""
SourceType | input_type = SourceType::kUnknown
std::string | sl_file_name = ""
bool | iplr = false
std::string | shader_bundle = ""
std::string | spirv_file_name = ""
std::string | reflection_json_name = ""
std::string | reflection_header_name = ""
std::string | reflection_cc_name = ""
std::string | depfile_path = ""
std::vector< std::string > | defines = {}
bool | json_format = false
SourceLanguage | source_language = SourceLanguage::kUnknown
uint32_t | gles_language_version = 0
std::string | metal_version = ""
std::string | entry_point = ""
bool | use_half_textures = false
bool | require_framebuffer_fetch = false

## Detailed Description

Definition at line 21 of file switches.h.

## Constructor & Destructor Documentation

## ◆ Switches() [1/2]

impeller::compiler::Switches::Switches | ( |  | ) |
| default

## ◆ ~Switches()

impeller::compiler::Switches::~Switches | ( |  | ) |
| default

## ◆ Switches() [2/2]

impeller::compiler::Switches::Switches | ( | const fml::CommandLine & | command_line | ) |
| explicit

Definition at line 160 of file switches.cc.

161 : working_directory(std::make_shared<fml::UniqueFD>(fml::OpenDirectory(
162 Utf8FromPath(std::filesystem::current_path()).c_str(),
163 false, // create if necessary,
164 fml::FilePermission::kRead))),
165 source_file_name(command_line.GetOptionValueWithDefault("input", "")),
166 input_type(SourceTypeFromCommandLine(command_line)),
167 sl_file_name(command_line.GetOptionValueWithDefault("sl", "")),
168 iplr(command_line.HasOption("iplr")),
169 shader_bundle(
170 command_line.GetOptionValueWithDefault("shader-bundle", "")),
171 spirv_file_name(command_line.GetOptionValueWithDefault("spirv", "")),
172 reflection_json_name(
173 command_line.GetOptionValueWithDefault("reflection-json", "")),
174 reflection_header_name(
175 command_line.GetOptionValueWithDefault("reflection-header", "")),
176 reflection_cc_name(
177 command_line.GetOptionValueWithDefault("reflection-cc", "")),
178 depfile_path(command_line.GetOptionValueWithDefault("depfile", "")),
179 json_format(command_line.HasOption("json")),
180 gles_language_version(
181 stoi(command_line.GetOptionValueWithDefault("gles-language-version",
182 "0"))),
183 metal_version(
184 command_line.GetOptionValueWithDefault("metal-version", "1.2")),
185 entry_point(
186 command_line.GetOptionValueWithDefault("entry-point", "main")),
187 use_half_textures(command_line.HasOption("use-half-textures")),
188 require_framebuffer_fetch(
189 command_line.HasOption("require-framebuffer-fetch")),
190 target_platform_(TargetPlatformFromCommandLine(command_line)),
191 runtime_stages_(RuntimeStagesFromCommandLine(command_line)) {
192 auto language = ToLowerCase(
193 command_line.GetOptionValueWithDefault("source-language", "glsl"));
194
195 source_language = ToSourceLanguage(language);
196
197 if (!working_directory || !working_directory->is_valid()) {
198 return;
199 }
200
201 for (const auto& include_dir_path : command_line.GetOptionValues("include")) {
202 if (!include_dir_path.data()) {
203 continue;
204 }
205
206 // fml::OpenDirectoryReadOnly for Windows doesn't handle relative paths
207 // beginning with `../` well, so we build an absolute path.
208
209 // Get the current working directory as a utf8 encoded string.
210 // Note that the `include_dir_path` is already utf8 encoded, and so we
211 // mustn't attempt to double-convert it to utf8 lest multi-byte characters
212 // will become mangled.
213 std::filesystem::path include_dir_absolute;
214 if (std::filesystem::path(include_dir_path).is_absolute()) {
215 include_dir_absolute = std::filesystem::path(include_dir_path);
216 } else {
217 auto cwd = Utf8FromPath(std::filesystem::current_path());
218 include_dir_absolute = std::filesystem::absolute(
219 std::filesystem::path(cwd) / include_dir_path);
220 }
221
222 auto dir = std::make_shared<fml::UniqueFD>(fml::OpenDirectoryReadOnly(
223 *working_directory, include_dir_absolute.string().c_str()));
224 if (!dir || !dir->is_valid()) {
225 continue;
226 }
227
228 IncludeDir dir_entry;
229 dir_entry.name = include_dir_path;
230 dir_entry.dir = std::move(dir);
231
232 include_directories.emplace_back(std::move(dir_entry));
233 }
234
235 for (const auto& define : command_line.GetOptionValues("define")) {
236 defines.emplace_back(define);
237 }
238 }
impeller::compiler::Switches::require_framebuffer_fetch
bool require_framebuffer_fetch
Definition: switches.h:45
impeller::compiler::Switches::reflection_json_name
std::string reflection_json_name
Definition: switches.h:34
impeller::compiler::Switches::use_half_textures
bool use_half_textures
Definition: switches.h:44
impeller::compiler::Switches::source_language
SourceLanguage source_language
Definition: switches.h:40
impeller::compiler::Switches::reflection_header_name
std::string reflection_header_name
Definition: switches.h:35
impeller::compiler::Switches::metal_version
std::string metal_version
Definition: switches.h:42
impeller::compiler::Switches::gles_language_version
uint32_t gles_language_version
Definition: switches.h:41
impeller::compiler::Switches::sl_file_name
std::string sl_file_name
Definition: switches.h:30
impeller::compiler::Switches::entry_point
std::string entry_point
Definition: switches.h:43
impeller::compiler::Switches::shader_bundle
std::string shader_bundle
Definition: switches.h:32
impeller::compiler::Switches::defines
std::vector< std::string > defines
Definition: switches.h:38
impeller::compiler::Switches::depfile_path
std::string depfile_path
Definition: switches.h:37
impeller::compiler::Switches::working_directory
std::shared_ptr< fml::UniqueFD > working_directory
Definition: switches.h:23
impeller::compiler::Switches::reflection_cc_name
std::string reflection_cc_name
Definition: switches.h:36
impeller::compiler::Switches::spirv_file_name
std::string spirv_file_name
Definition: switches.h:33
impeller::compiler::Switches::input_type
SourceType input_type
Definition: switches.h:26
impeller::compiler::Switches::iplr
bool iplr
Definition: switches.h:31
impeller::compiler::Switches::source_file_name
std::string source_file_name
Definition: switches.h:25
impeller::compiler::Switches::json_format
bool json_format
Definition: switches.h:39
impeller::compiler::Switches::include_directories
std::vector< IncludeDir > include_directories
Definition: switches.h:24
impeller::compiler::ToLowerCase
std::string ToLowerCase(std::string_view string)
Definition: utilities.cc:62
impeller::compiler::RuntimeStagesFromCommandLine
static std::vector< TargetPlatform > RuntimeStagesFromCommandLine(const fml::CommandLine &command_line)
Definition: switches.cc:138
impeller::compiler::Utf8FromPath
std::string Utf8FromPath(const std::filesystem::path &path)
Converts a native format path to a utf8 string.
Definition: utilities.cc:30
impeller::compiler::TargetPlatformFromCommandLine
static TargetPlatform TargetPlatformFromCommandLine(const fml::CommandLine &command_line)
Definition: switches.cc:120
impeller::compiler::ToSourceLanguage
SourceLanguage ToSourceLanguage(const std::string &source_language)
Definition: types.cc:64
impeller::compiler::SourceTypeFromCommandLine
static SourceType SourceTypeFromCommandLine(const fml::CommandLine &command_line)
Definition: switches.cc:149

References defines, impeller::compiler::IncludeDir::dir, include_directories, impeller::compiler::IncludeDir::name, source_language, impeller::compiler::ToLowerCase(), impeller::compiler::ToSourceLanguage(), impeller::compiler::Utf8FromPath(), and working_directory.

## Member Function Documentation

## ◆ AreValid()

bool impeller::compiler::Switches::AreValid | ( | std::ostream & | explain | ) | const

Definition at line 240 of file switches.cc.

240 {
241 // When producing a shader bundle, all flags related to single shader inputs
242 // and outputs such as `--input` and `--spirv-file-name` are ignored. Instead,
243 // input files are read from the shader bundle spec and a single flatbuffer
244 // containing all compiled shaders and reflection state is output to `--sl`.
245 const bool shader_bundle_mode = !shader_bundle.empty();
246
247 bool valid = true;
248 if (target_platform_ == TargetPlatform::kUnknown && runtime_stages_.empty() &&
249 !shader_bundle_mode) {
250 explain << "Either a target platform was not specified, or no runtime "
251 "stages were specified."
252 << std::endl;
253 valid = false;
254 }
255
256 if (source_language == SourceLanguage::kUnknown && !shader_bundle_mode) {
257 explain << "Invalid source language type." << std::endl;
258 valid = false;
259 }
260
261 if (!working_directory || !working_directory->is_valid()) {
262 explain << "Could not open the working directory: \""
263 << Utf8FromPath(std::filesystem::current_path()).c_str() << "\""
264 << std::endl;
265 valid = false;
266 }
267
268 if (source_file_name.empty() && !shader_bundle_mode) {
269 explain << "Input file name was empty." << std::endl;
270 valid = false;
271 }
272
273 if (sl_file_name.empty()) {
274 explain << "Target shading language file name was empty." << std::endl;
275 valid = false;
276 }
277
278 if (spirv_file_name.empty() && !shader_bundle_mode) {
279 explain << "Spirv file name was empty." << std::endl;
280 valid = false;
281 }
282
283 if (iplr && shader_bundle_mode) {
284 explain << "--iplr and --shader-bundle flag cannot be specified at the "
285 "same time"
286 << std::endl;
287 valid = false;
288 }
289
290 return valid;
291 }
impeller::compiler::SourceLanguage::kUnknown
@ kUnknown
impeller::compiler::TargetPlatform::kUnknown
@ kUnknown

References iplr, impeller::compiler::kUnknown, shader_bundle, sl_file_name, source_file_name, source_language, spirv_file_name, impeller::compiler::Utf8FromPath(), and working_directory.

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

## ◆ CreateSourceOptions()

SourceOptions impeller::compiler::Switches::CreateSourceOptions | ( | std::optional< TargetPlatform > | target_platform = `std::nullopt` | ) | const

Definition at line 308 of file switches.cc.

309 {
310 SourceOptions options;
311 options.target_platform =
312 target_platform.value_or(SelectDefaultTargetPlatform());
313 options.source_language = source_language;
314 if (input_type == SourceType::kUnknown) {
315 options.type = SourceTypeFromFileName(source_file_name);
316 } else {
317 options.type = input_type;
318 }
319 options.working_directory = working_directory;
320 options.file_name = source_file_name;
321 options.include_dirs = include_directories;
322 options.defines = defines;
323 options.entry_point_name = EntryPointFunctionNameFromSourceName(
324 source_file_name, options.type, options.source_language, entry_point);
325 options.json_format = json_format;
326 options.gles_language_version = gles_language_version;
327 options.metal_version = metal_version;
328 options.use_half_textures = use_half_textures;
329 options.require_framebuffer_fetch = require_framebuffer_fetch;
330 return options;
331 }
impeller::compiler::Switches::SelectDefaultTargetPlatform
TargetPlatform SelectDefaultTargetPlatform() const
Definition: switches.cc:300
impeller::compiler::SourceType::kUnknown
@ kUnknown
impeller::compiler::SourceTypeFromFileName
SourceType SourceTypeFromFileName(const std::string &file_name)
Definition: types.cc:30
impeller::compiler::EntryPointFunctionNameFromSourceName
std::string EntryPointFunctionNameFromSourceName(const std::string &file_name, SourceType type, SourceLanguage source_language, const std::string &entry_point_name)
Definition: types.cc:113

References impeller::compiler::SourceOptions::defines, defines, entry_point, impeller::compiler::SourceOptions::entry_point_name, impeller::compiler::EntryPointFunctionNameFromSourceName(), impeller::compiler::SourceOptions::file_name, impeller::compiler::SourceOptions::gles_language_version, gles_language_version, include_directories, impeller::compiler::SourceOptions::include_dirs, input_type, impeller::compiler::SourceOptions::json_format, json_format, impeller::compiler::kUnknown, impeller::compiler::SourceOptions::metal_version, metal_version, impeller::compiler::SourceOptions::require_framebuffer_fetch, require_framebuffer_fetch, SelectDefaultTargetPlatform(), source_file_name, impeller::compiler::SourceOptions::source_language, source_language, impeller::compiler::SourceTypeFromFileName(), impeller::compiler::SourceOptions::target_platform, impeller::compiler::SourceOptions::type, impeller::compiler::SourceOptions::use_half_textures, use_half_textures, impeller::compiler::SourceOptions::working_directory, and working_directory.

Referenced by impeller::compiler::CompileSkSL(), impeller::compiler::GenerateShaderBundle(), impeller::compiler::Main(), and impeller::compiler::OutputIPLR().

## ◆ PlatformsToCompile()

std::vector< TargetPlatform > impeller::compiler::Switches::PlatformsToCompile | ( |  | ) | const

A vector containing at least one valid platform.

Definition at line 293 of file switches.cc.

293 {
294 if (target_platform_ == TargetPlatform::kUnknown) {
295 return runtime_stages_;
296 }
297 return {target_platform_};
298 }

References impeller::compiler::kUnknown.

Referenced by impeller::compiler::OutputIPLR().

## ◆ PrintHelp()

void impeller::compiler::Switches::PrintHelp | ( | std::ostream & | stream | ) |
| static

Definition at line 42 of file switches.cc.

42 {
43 // clang-format off
44 const std::string optional_prefix = "[optional] ";
45 const std::string optional_multiple_prefix = "[optional,multiple] ";
46 // clang-format on
47
48 stream << std::endl;
49 stream << "ImpellerC is an offline shader processor and reflection engine."
50 << std::endl;
51 stream << "---------------------------------------------------------------"
52 << std::endl;
53 stream << "Expected invocation is:" << std::endl << std::endl;
54 stream << "./impellerc <One platform or multiple runtime stages> "
55 "--input=<source_file> --sl=<sl_output_file> <optional arguments>"
56 << std::endl
57 << std::endl;
58
59 stream << "Valid platforms are:" << std::endl << std::endl;
60 stream << "One of [";
61 for (const auto& platform : kKnownPlatforms) {
62 stream << " --" << platform.first;
63 }
64 stream << " ]" << std::endl << std::endl;
65
66 stream << "Valid runtime stages are:" << std::endl << std::endl;
67 stream << "At least one of [";
68 for (const auto& platform : kKnownRuntimeStages) {
69 stream << " --" << platform.first;
70 }
71 stream << " ]" << std::endl << std::endl;
72
73 stream << "Optional arguments:" << std::endl << std::endl;
74 stream << optional_prefix
75 << "--spirv=<spirv_output_file> (ignored for --shader-bundle)"
76 << std::endl;
77 stream << optional_prefix << "--input-type={";
78 for (const auto& source_type : kKnownSourceTypes) {
79 stream << source_type.first << ", ";
80 }
81 stream << "}" << std::endl;
82 stream << optional_prefix << "--source-language=glsl|hlsl (default: glsl)"
83 << std::endl;
84 stream << optional_prefix
85 << "--entry-point=<entry_point_name> (default: main; "
86 "ignored for glsl)"
87 << std::endl;
88 stream << optional_prefix
89 << "--iplr (causes --sl file to be emitted in "
90 "iplr format)"
91 << std::endl;
92 stream << optional_prefix
93 << "--shader-bundle=<bundle_spec> (causes --sl "
94 "file to be "
95 "emitted in Flutter GPU's shader bundle format)"
96 << std::endl;
97 stream << optional_prefix << "--reflection-json=<reflection_json_file>"
98 << std::endl;
99 stream << optional_prefix << "--reflection-header=<reflection_header_file>"
100 << std::endl;
101 stream << optional_prefix << "--reflection-cc=<reflection_cc_file>"
102 << std::endl;
103 stream << optional_multiple_prefix << "--include=<include_directory>"
104 << std::endl;
105 stream << optional_multiple_prefix << "--define=<define>" << std::endl;
106 stream << optional_prefix << "--depfile=<depfile_path>" << std::endl;
107 stream << optional_prefix << "--gles-language-version=<number>" << std::endl;
108 stream << optional_prefix << "--json" << std::endl;
109 stream << optional_prefix
110 << "--use-half-textures (force openGL semantics when "
111 "targeting metal)"
112 << std::endl;
113 stream << optional_prefix << "--require-framebuffer-fetch" << std::endl;
114 }
impeller::compiler::kKnownPlatforms
static const std::map< std::string, TargetPlatform > kKnownPlatforms
Definition: switches.cc:20
impeller::compiler::kKnownRuntimeStages
static const std::map< std::string, TargetPlatform > kKnownRuntimeStages
Definition: switches.cc:28
impeller::compiler::kKnownSourceTypes
static const std::map< std::string, SourceType > kKnownSourceTypes
Definition: switches.cc:36

References impeller::compiler::kKnownPlatforms, impeller::compiler::kKnownRuntimeStages, and impeller::compiler::kKnownSourceTypes.

Referenced by impeller::compiler::Main().

## ◆ SelectDefaultTargetPlatform()

TargetPlatform impeller::compiler::Switches::SelectDefaultTargetPlatform | ( |  | ) | const

Definition at line 300 of file switches.cc.

300 {
301 if (target_platform_ == TargetPlatform::kUnknown &&
302 !runtime_stages_.empty()) {
303 return runtime_stages_.front();
304 }
305 return target_platform_;
306 }

References impeller::compiler::kUnknown.

Referenced by CreateSourceOptions(), impeller::compiler::OutputDepfile(), and impeller::compiler::OutputIPLR().

## Member Data Documentation

## ◆ defines

std::vector<std::string> impeller::compiler::Switches::defines = {}

Definition at line 38 of file switches.h.

Referenced by CreateSourceOptions(), and Switches().

## ◆ depfile_path

std::string impeller::compiler::Switches::depfile_path = ""

Definition at line 37 of file switches.h.

Referenced by impeller::compiler::OutputDepfile().

## ◆ entry_point

std::string impeller::compiler::Switches::entry_point = ""

Definition at line 43 of file switches.h.

Referenced by CreateSourceOptions(), and impeller::compiler::testing::TEST().

## ◆ gles_language_version

uint32_t impeller::compiler::Switches::gles_language_version = 0

Definition at line 41 of file switches.h.

Referenced by CreateSourceOptions().

## ◆ include_directories

std::vector<IncludeDir> impeller::compiler::Switches::include_directories = {}

Definition at line 24 of file switches.h.

Referenced by CreateSourceOptions(), Switches(), and impeller::compiler::testing::TEST().

## ◆ input_type

SourceType impeller::compiler::Switches::input_type = SourceType::kUnknown

Definition at line 26 of file switches.h.

Referenced by CreateSourceOptions().

## ◆ iplr

bool impeller::compiler::Switches::iplr = false

Definition at line 31 of file switches.h.

Referenced by AreValid(), impeller::compiler::Main(), and impeller::compiler::OutputIPLR().

## ◆ json_format

bool impeller::compiler::Switches::json_format = false

Definition at line 39 of file switches.h.

Referenced by CreateSourceOptions(), and impeller::compiler::OutputIPLR().

## ◆ metal_version

std::string impeller::compiler::Switches::metal_version = ""

Definition at line 42 of file switches.h.

Referenced by CreateSourceOptions().

## ◆ reflection_cc_name

std::string impeller::compiler::Switches::reflection_cc_name = ""

Definition at line 36 of file switches.h.

Referenced by impeller::compiler::OutputReflectionData().

## ◆ reflection_header_name

std::string impeller::compiler::Switches::reflection_header_name = ""

Definition at line 35 of file switches.h.

Referenced by impeller::compiler::CreateReflectorOptions(), and impeller::compiler::OutputReflectionData().

## ◆ reflection_json_name

std::string impeller::compiler::Switches::reflection_json_name = ""

Definition at line 34 of file switches.h.

Referenced by impeller::compiler::OutputReflectionData().

## ◆ require_framebuffer_fetch

bool impeller::compiler::Switches::require_framebuffer_fetch = false

Definition at line 45 of file switches.h.

Referenced by CreateSourceOptions().

## ◆ shader_bundle

std::string impeller::compiler::Switches::shader_bundle = ""

Definition at line 32 of file switches.h.

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

## ◆ sl_file_name

std::string impeller::compiler::Switches::sl_file_name = ""

The raw shader file output by the compiler. For –iplr and –shader-bundle modes, this is used as the filename for the output flatbuffer output.

Definition at line 30 of file switches.h.

Referenced by AreValid(), impeller::compiler::GenerateShaderBundle(), impeller::compiler::OutputDepfile(), impeller::compiler::OutputIPLR(), and impeller::compiler::OutputSLFile().

## ◆ source_file_name

std::string impeller::compiler::Switches::source_file_name = ""

Definition at line 25 of file switches.h.

Referenced by AreValid(), impeller::compiler::CreateReflectorOptions(), CreateSourceOptions(), and impeller::compiler::Main().

## ◆ source_language

SourceLanguage impeller::compiler::Switches::source_language = SourceLanguage::kUnknown

Definition at line 40 of file switches.h.

Referenced by AreValid(), CreateSourceOptions(), Switches(), and impeller::compiler::testing::TEST().

## ◆ spirv_file_name

std::string impeller::compiler::Switches::spirv_file_name = ""

Definition at line 33 of file switches.h.

Referenced by AreValid(), impeller::compiler::Main(), and impeller::compiler::OutputDepfile().

## ◆ use_half_textures

bool impeller::compiler::Switches::use_half_textures = false

Definition at line 44 of file switches.h.

Referenced by CreateSourceOptions().

## ◆ working_directory

std::shared_ptr<fml::UniqueFD> impeller::compiler::Switches::working_directory = nullptr

Definition at line 23 of file switches.h.

Referenced by AreValid(), CreateSourceOptions(), impeller::compiler::GenerateShaderBundle(), impeller::compiler::Main(), impeller::compiler::OutputDepfile(), impeller::compiler::OutputIPLR(), impeller::compiler::OutputReflectionData(), impeller::compiler::OutputSLFile(), and Switches().

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

- impeller/compiler/switches.h
- impeller/compiler/switches.cc