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| 1 // Copyright 2015 The Shaderc Authors. All rights reserved. |
| 2 // |
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 // you may not use this file except in compliance with the License. |
| 5 // You may obtain a copy of the License at |
| 6 // |
| 7 // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 // |
| 9 // Unless required by applicable law or agreed to in writing, software |
| 10 // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 // See the License for the specific language governing permissions and |
| 13 // limitations under the License. |
| 14 |
| 15 #ifndef SHADERC_H_ |
| 16 #define SHADERC_H_ |
| 17 |
| 18 #ifdef __cplusplus |
| 19 extern "C" { |
| 20 #endif |
| 21 |
| 22 #include <stdbool.h> |
| 23 #include <stddef.h> |
| 24 #include <stdint.h> |
| 25 |
| 26 typedef enum { |
| 27 // Forced shader kinds. These shader kinds force the compiler to compile the |
| 28 // source code as the specified kind of shader. |
| 29 shaderc_glsl_vertex_shader, |
| 30 shaderc_glsl_fragment_shader, |
| 31 shaderc_glsl_compute_shader, |
| 32 shaderc_glsl_geometry_shader, |
| 33 shaderc_glsl_tess_control_shader, |
| 34 shaderc_glsl_tess_evaluation_shader, |
| 35 // Deduce the shader kind from #pragma annotation in the source code. Compiler |
| 36 // will emit error if #pragma annotation is not found. |
| 37 shaderc_glsl_infer_from_source, |
| 38 // Default shader kinds. Compiler will fall back to compile the source code as |
| 39 // the specified kind of shader when #pragma annotation is not found in the |
| 40 // source code. |
| 41 shaderc_glsl_default_vertex_shader, |
| 42 shaderc_glsl_default_fragment_shader, |
| 43 shaderc_glsl_default_compute_shader, |
| 44 shaderc_glsl_default_geometry_shader, |
| 45 shaderc_glsl_default_tess_control_shader, |
| 46 shaderc_glsl_default_tess_evaluation_shader, |
| 47 } shaderc_shader_kind; |
| 48 |
| 49 typedef enum { |
| 50 shaderc_target_env_vulkan, // create SPIR-V under Vulkan semantics |
| 51 shaderc_target_env_opengl, // create SPIR-V under OpenGL semantics |
| 52 shaderc_target_env_opengl_compat, // create SPIR-V under OpenGL semantics, |
| 53 // including compatibility profile |
| 54 // functions |
| 55 shaderc_target_env_default = shaderc_target_env_vulkan |
| 56 } shaderc_target_env; |
| 57 |
| 58 typedef enum { |
| 59 shaderc_profile_none, // Used if and only if GLSL version did not specify |
| 60 // profiles. |
| 61 shaderc_profile_core, |
| 62 shaderc_profile_compatibility, |
| 63 shaderc_profile_es, |
| 64 } shaderc_profile; |
| 65 |
| 66 // Used in the result module (shaderc_spv_module) to indicate the status of an |
| 67 // compilation. |
| 68 typedef enum { |
| 69 shaderc_compilation_status_success = 0, |
| 70 shaderc_compilation_status_invalid_stage, // error stage deduction |
| 71 shaderc_compilation_status_compilation_error, |
| 72 shaderc_compilation_status_internal_error, // unexpected failure |
| 73 shaderc_compilation_status_null_result_module, |
| 74 } shaderc_compilation_status; |
| 75 |
| 76 // Usage examples: |
| 77 // |
| 78 // Aggressively release compiler resources, but spend time in initialization |
| 79 // for each new use. |
| 80 // shaderc_compiler_t compiler = shaderc_compiler_initialize(); |
| 81 // shader_spv_module_t module = shaderc_compile_into_spv(compiler, |
| 82 // "int main() {}", 13, shaderc_glsl_vertex_shader, "main"); |
| 83 // // Do stuff with module compilation results. |
| 84 // shaderc_module_release(module); |
| 85 // shaderc_compiler_release(compiler); |
| 86 // |
| 87 // Keep the compiler object around for a long time, but pay for extra space |
| 88 // occupied. |
| 89 // shaderc_compiler_t compiler = shaderc_compiler_initialize(); |
| 90 // // On the same, other or multiple simultaneous threads. |
| 91 // shader_spv_module_t module = shaderc_compile_into_spv(compiler, |
| 92 // "int main() {}", 13, shaderc_glsl_vertex_shader, "main"); |
| 93 // // Do stuff with module compilation results. |
| 94 // shaderc_module_release(module); |
| 95 // // Once no more compilations are to happen. |
| 96 // shaderc_compiler_release(compiler); |
| 97 |
| 98 // An opaque handle to an object that manages all compiler state. |
| 99 typedef struct shaderc_compiler* shaderc_compiler_t; |
| 100 |
| 101 // Returns a shaderc_compiler_t that can be used to compile modules. |
| 102 // A return of NULL indicates that there was an error initializing the compiler. |
| 103 // Any function operating on shaderc_compiler_t must offer the basic |
| 104 // thread-safety guarantee. |
| 105 // [http://herbsutter.com/2014/01/13/gotw-95-solution-thread-safety-and-synchron
ization/] |
| 106 // That is: concurrent invocation of these functions on DIFFERENT objects needs |
| 107 // no synchronization; concurrent invocation of these functions on the SAME |
| 108 // object requires synchronization IF AND ONLY IF some of them take a non-const |
| 109 // argument. |
| 110 shaderc_compiler_t shaderc_compiler_initialize(void); |
| 111 |
| 112 // Releases the resources held by the shaderc_compiler_t. |
| 113 // After this call it is invalid to make any future calls to functions |
| 114 // involving this shaderc_compiler_t. |
| 115 void shaderc_compiler_release(shaderc_compiler_t); |
| 116 |
| 117 // An opaque handle to an object that manages options to a single compilation |
| 118 // result. |
| 119 typedef struct shaderc_compile_options* shaderc_compile_options_t; |
| 120 |
| 121 // Returns a default-initialized shaderc_compile_options_t that can be used |
| 122 // to modify the functionality of a compiled module. |
| 123 // A return of NULL indicates that there was an error initializing the options. |
| 124 // Any function operating on shaderc_compile_options_t must offer the |
| 125 // basic thread-safety guarantee. |
| 126 shaderc_compile_options_t shaderc_compile_options_initialize(void); |
| 127 |
| 128 // Returns a copy of the given shaderc_compile_options_t. |
| 129 // If NULL is passed as the parameter the call is the same as |
| 130 // shaderc_compile_options_init. |
| 131 shaderc_compile_options_t shaderc_compile_options_clone( |
| 132 const shaderc_compile_options_t options); |
| 133 |
| 134 // Releases the compilation options. It is invalid to use the given |
| 135 // shaderc_compile_options_t object in any future calls. It is safe to pass |
| 136 // NULL to this function, and doing such will have no effect. |
| 137 void shaderc_compile_options_release(shaderc_compile_options_t options); |
| 138 |
| 139 // Adds a predefined macro to the compilation options. This has the |
| 140 // same effect as passing -Dname=value to the command-line compiler. |
| 141 // If value is NULL, it has the effect same as passing -Dname to the |
| 142 // command-line compiler. If a macro definition with the same name has |
| 143 // previously been added, the value is replaced with the new value. |
| 144 // The null-terminated strings that the name and value parameters point to |
| 145 // must remain valid for the duration of the call, but can be modified or |
| 146 // deleted after this function has returned. |
| 147 void shaderc_compile_options_add_macro_definition( |
| 148 shaderc_compile_options_t options, const char* name, const char* value); |
| 149 |
| 150 // Sets the compiler mode to generate debug information in the output. |
| 151 void shaderc_compile_options_set_generate_debug_info( |
| 152 shaderc_compile_options_t options); |
| 153 |
| 154 // Sets the compiler mode to emit a disassembly text instead of a binary. In |
| 155 // this mode, the byte array result in the shaderc_spv_module returned |
| 156 // from shaderc_compile_into_spv() will consist of SPIR-V assembly text. |
| 157 // Note the preprocessing only mode overrides this option, and this option |
| 158 // overrides the default mode generating a SPIR-V binary. |
| 159 void shaderc_compile_options_set_disassembly_mode( |
| 160 shaderc_compile_options_t options); |
| 161 |
| 162 // Forces the GLSL language version and profile to a given pair. The version |
| 163 // number is the same as would appear in the #version annotation in the source. |
| 164 // Version and profile specified here overrides the #version annotation in the |
| 165 // source. Use profile: 'shaderc_profile_none' for GLSL versions that do not |
| 166 // define profiles, e.g. versions below 150. |
| 167 void shaderc_compile_options_set_forced_version_profile( |
| 168 shaderc_compile_options_t options, int version, shaderc_profile profile); |
| 169 |
| 170 // To support file inclusion, libshaderc invokes a callback into its client to |
| 171 // resolve the full path and content of the included file. |
| 172 // The client callback should follow the specified function signature below, and |
| 173 // it should be passed to libshaderc through the corresponding setter function. |
| 174 // When the including of a file is done, libshaderc will call another client |
| 175 // callback to clean up the resources used for the including process. The client |
| 176 // should implement the clean up method and pass it to libshaderc together with |
| 177 // the response method. |
| 178 |
| 179 // The struct that contains the information to be returned to the libshaderc. |
| 180 // The client-side implemented response method should return a pointer of this |
| 181 // struct. The underlying data is owned by client code. |
| 182 struct shaderc_includer_response { |
| 183 const char* path; |
| 184 size_t path_length; |
| 185 const char* content; |
| 186 size_t content_length; |
| 187 }; |
| 188 |
| 189 // The function signature of the client-side implemented response method. It |
| 190 // returns a pointer to shaderc_includer_response struct. |
| 191 typedef shaderc_includer_response* (*shaderc_includer_response_get_fn)( |
| 192 void* user_data, const char* filename); |
| 193 |
| 194 // The function signature of the client-side implemented clean-up method. |
| 195 // Includer will call this callback function when the including process is done |
| 196 // with the fullpath and content data. |
| 197 typedef void (*shaderc_includer_response_release_fn)( |
| 198 void* user_data, shaderc_includer_response* data); |
| 199 |
| 200 // Sets the callback functions for the includer. When the includer queries for |
| 201 // the full path and content of a file, client's method will be called to |
| 202 // response. And when the query is done, client will be notified to clean up. |
| 203 // TODO: File inclusion needs to be context-aware. |
| 204 // e.g. |
| 205 // In file: /path/to/main_shader.vert: |
| 206 // #include "include/a" |
| 207 // In file: /path/to/include/a": |
| 208 // #include "b" |
| 209 // When compiling /path/to/main_shader.vert, the compiler should be able to |
| 210 // go to /path/to/include/b to find the file b. |
| 211 // This needs context info from compiler to client includer, and may needs |
| 212 // interface changes. |
| 213 void shaderc_compile_options_set_includer_callbacks( |
| 214 shaderc_compile_options_t options, shaderc_includer_response_get_fn getter, |
| 215 shaderc_includer_response_release_fn releasor, void* user_data); |
| 216 |
| 217 // Sets the compiler mode to do only preprocessing. The byte array result in the |
| 218 // module returned by the compilation is the text of the preprocessed shader. |
| 219 // This option overrides all other compilation modes, such as disassembly mode |
| 220 // and the default mode of compilation to SPIR-V binary. |
| 221 void shaderc_compile_options_set_preprocessing_only_mode( |
| 222 shaderc_compile_options_t options); |
| 223 |
| 224 // Sets the compiler mode to suppress warnings, overriding warnings-as-errors |
| 225 // mode. When both suppress-warnings and warnings-as-errors modes are |
| 226 // turned on, warning messages will be inhibited, and will not be emitted |
| 227 // as error messages. |
| 228 void shaderc_compile_options_set_suppress_warnings( |
| 229 shaderc_compile_options_t options); |
| 230 |
| 231 // Sets the target shader environment, affecting which warnings or errors will |
| 232 // be issued. The version will be for distinguishing between different versions |
| 233 // of the target environment. "0" is the only supported version at this point |
| 234 void shaderc_compile_options_set_target_env(shaderc_compile_options_t options, |
| 235 shaderc_target_env target, |
| 236 uint32_t version); |
| 237 |
| 238 // Sets the compiler mode to treat all warnings as errors. Note the |
| 239 // suppress-warnings mode overrides this option, i.e. if both |
| 240 // warning-as-errors and suppress-warnings modes are set, warnings will not |
| 241 // be emitted as error messages. |
| 242 void shaderc_compile_options_set_warnings_as_errors( |
| 243 shaderc_compile_options_t options); |
| 244 |
| 245 // An opaque handle to the results of a call to shaderc_compile_into_spv(). |
| 246 typedef struct shaderc_spv_module* shaderc_spv_module_t; |
| 247 |
| 248 // Takes a GLSL source string and the associated shader kind, input file |
| 249 // name, compiles it according to the given additional_options. If the shader |
| 250 // kind is not set to a specified kind, but shaderc_glslc_infer_from_source, |
| 251 // the compiler will try to deduce the shader kind from the source |
| 252 // string and a failure in deducing will generate an error. Currently only |
| 253 // #pragma annotation is supported. If the shader kind is set to one of the |
| 254 // default shader kinds, the compiler will fall back to the default shader |
| 255 // kind in case it failed to deduce the shader kind from source string. |
| 256 // The input_file_name is a null-termintated string. It is used as a tag to |
| 257 // identify the source string in cases like emitting error messages. It |
| 258 // doesn't have to be a 'file name'. |
| 259 // By default the source string will be compiled into SPIR-V binary |
| 260 // and a shaderc_spv_module will be returned to hold the results of the |
| 261 // compilation. When disassembly mode or preprocessing only mode is enabled |
| 262 // in the additional_options, the source string will be compiled into char |
| 263 // strings and held by the returned shaderc_spv_module. The entry_point_name |
| 264 // null-terminated string defines the name of the entry point to associate |
| 265 // with this GLSL source. If the additional_options parameter is not NULL, |
| 266 // then the compilation is modified by any options present. May be safely |
| 267 // called from multiple threads without explicit synchronization. If there |
| 268 // was failure in allocating the compiler object NULL will be returned. |
| 269 shaderc_spv_module_t shaderc_compile_into_spv( |
| 270 const shaderc_compiler_t compiler, const char* source_text, |
| 271 size_t source_text_size, shaderc_shader_kind shader_kind, |
| 272 const char* input_file_name, const char* entry_point_name, |
| 273 const shaderc_compile_options_t additional_options); |
| 274 |
| 275 // The following functions, operating on shaderc_spv_module_t objects, offer |
| 276 // only the basic thread-safety guarantee. |
| 277 |
| 278 // Releases the resources held by module. It is invalid to use module for any |
| 279 // further operations. |
| 280 void shaderc_module_release(shaderc_spv_module_t module); |
| 281 |
| 282 // Returns true if the result in module was a successful compilation. |
| 283 bool shaderc_module_get_success(const shaderc_spv_module_t module); |
| 284 |
| 285 // Returns the number of bytes in a SPIR-V module result string. When the module |
| 286 // is compiled with disassembly mode or preprocessing only mode, the result |
| 287 // string is a char string. Otherwise, the result string is binary string. |
| 288 size_t shaderc_module_get_length(const shaderc_spv_module_t module); |
| 289 |
| 290 // Returns the number of warnings generated during the compilation. |
| 291 size_t shaderc_module_get_num_warnings(const shaderc_spv_module_t module); |
| 292 |
| 293 // Returns the number of errors generated during the compilation. |
| 294 size_t shaderc_module_get_num_errors(const shaderc_spv_module_t module); |
| 295 |
| 296 // Returns the compilation status, indicating whether the compilation succeeded, |
| 297 // or failed due to some reasons, like invalid shader stage or compilation |
| 298 // errors. |
| 299 shaderc_compilation_status shaderc_module_get_compilation_status( |
| 300 const shaderc_spv_module_t); |
| 301 |
| 302 // Returns a pointer to the start of the SPIR-V bytes, either SPIR-V binary or |
| 303 // char string. When the source string is compiled into SPIR-V binary, this is |
| 304 // guaranteed to be castable to a uint32_t*. If the source string is compiled in |
| 305 // disassembly mode or preprocessing only mode, the pointer will point to the |
| 306 // result char string. |
| 307 const char* shaderc_module_get_bytes(const shaderc_spv_module_t module); |
| 308 |
| 309 // Returns a null-terminated string that contains any error messages generated |
| 310 // during the compilation. |
| 311 const char* shaderc_module_get_error_message(const shaderc_spv_module_t module); |
| 312 |
| 313 // Provides the version & revision of the SPIR-V which will be produced |
| 314 void shaderc_get_spv_version(unsigned int* version, unsigned int* revision); |
| 315 |
| 316 // Parses the version and profile from a given null-terminated string |
| 317 // containing both version and profile, like: '450core'. Returns false if |
| 318 // the string can not be parsed. Returns true when the parsing succeeds. The |
| 319 // parsed version and profile are returned through arguments. |
| 320 bool shaderc_parse_version_profile(const char* str, int* version, |
| 321 shaderc_profile* profile); |
| 322 |
| 323 #ifdef __cplusplus |
| 324 } |
| 325 #endif // __cplusplus |
| 326 |
| 327 #endif // SHADERC_H_ |
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