git.cworth.org Git - apitrace/blob - retrace/glretrace.py

   1 ##########################################################################
   2 #
   3 # Copyright 2010 VMware, Inc.
   4 # All Rights Reserved.
   5 #
   6 # Permission is hereby granted, free of charge, to any person obtaining a copy
   7 # of this software and associated documentation files (the "Software"), to deal
   8 # in the Software without restriction, including without limitation the rights
   9 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 # copies of the Software, and to permit persons to whom the Software is
  11 # furnished to do so, subject to the following conditions:
  12 #
  13 # The above copyright notice and this permission notice shall be included in
  14 # all copies or substantial portions of the Software.
  15 #
  16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 # THE SOFTWARE.
  23 #
  24 ##########################################################################/
  25
  26
  27 """GL retracer generator."""
  28
  29
  30 from retrace import Retracer
  31 import specs.stdapi as stdapi
  32 import specs.glapi as glapi
  33 import specs.glesapi as glesapi
  34
  35
  36 class GlRetracer(Retracer):
  37
  38     table_name = 'glretrace::gl_callbacks'
  39
  40     def retraceFunction(self, function):
  41         Retracer.retraceFunction(self, function)
  42
  43     array_pointer_function_names = set((
  44         "glVertexPointer",
  45         "glNormalPointer",
  46         "glColorPointer",
  47         "glIndexPointer",
  48         "glTexCoordPointer",
  49         "glEdgeFlagPointer",
  50         "glFogCoordPointer",
  51         "glSecondaryColorPointer",
  52
  53         "glInterleavedArrays",
  54
  55         "glVertexPointerEXT",
  56         "glNormalPointerEXT",
  57         "glColorPointerEXT",
  58         "glIndexPointerEXT",
  59         "glTexCoordPointerEXT",
  60         "glEdgeFlagPointerEXT",
  61         "glFogCoordPointerEXT",
  62         "glSecondaryColorPointerEXT",
  63
  64         "glVertexAttribPointer",
  65         "glVertexAttribPointerARB",
  66         "glVertexAttribPointerNV",
  67         "glVertexAttribIPointer",
  68         "glVertexAttribIPointerEXT",
  69         "glVertexAttribLPointer",
  70         "glVertexAttribLPointerEXT",
  71
  72         #"glMatrixIndexPointerARB",
  73     ))
  74
  75     draw_array_function_names = set([
  76         "glDrawArrays",
  77         "glDrawArraysEXT",
  78         "glDrawArraysIndirect",
  79         "glDrawArraysInstanced",
  80         "glDrawArraysInstancedARB",
  81         "glDrawArraysInstancedEXT",
  82         "glDrawArraysInstancedBaseInstance",
  83         "glDrawMeshArraysSUN",
  84         "glMultiDrawArrays",
  85         "glMultiDrawArraysEXT",
  86         "glMultiModeDrawArraysIBM",
  87     ])
  88
  89     draw_elements_function_names = set([
  90         "glDrawElements",
  91         "glDrawElementsBaseVertex",
  92         "glDrawElementsIndirect",
  93         "glDrawElementsInstanced",
  94         "glDrawElementsInstancedARB",
  95         "glDrawElementsInstancedEXT",
  96         "glDrawElementsInstancedBaseVertex",
  97         "glDrawElementsInstancedBaseInstance",
  98         "glDrawElementsInstancedBaseVertexBaseInstance",
  99         "glDrawRangeElements",
 100         "glDrawRangeElementsEXT",
 101         "glDrawRangeElementsBaseVertex",
 102         "glMultiDrawElements",
 103         "glMultiDrawElementsBaseVertex",
 104         "glMultiDrawElementsEXT",
 105         "glMultiModeDrawElementsIBM",
 106     ])
 107
 108     draw_indirect_function_names = set([
 109         "glDrawArraysIndirect",
 110         "glDrawElementsIndirect",
 111     ])
 112
 113     misc_draw_function_names = set([
 114         "glCallList",
 115         "glCallLists",
 116         "glClear",
 117         "glEnd",
 118         "glDrawPixels",
 119         "glBlitFramebuffer",
 120         "glBlitFramebufferEXT",
 121     ])
 122
 123     bind_framebuffer_function_names = set([
 124         "glBindFramebuffer",
 125         "glBindFramebufferEXT",
 126         "glBindFramebufferOES",
 127     ])
 128
 129     # Names of the functions that can pack into the current pixel buffer
 130     # object.  See also the ARB_pixel_buffer_object specification.
 131     pack_function_names = set([
 132         'glGetCompressedTexImage',
 133         'glGetConvolutionFilter',
 134         'glGetHistogram',
 135         'glGetMinmax',
 136         'glGetPixelMapfv',
 137         'glGetPixelMapuiv',
 138         'glGetPixelMapusv',
 139         'glGetPolygonStipple',
 140         'glGetSeparableFilter',
 141         'glGetTexImage',
 142         'glReadPixels',
 143         'glGetnCompressedTexImageARB',
 144         'glGetnConvolutionFilterARB',
 145         'glGetnHistogramARB',
 146         'glGetnMinmaxARB',
 147         'glGetnPixelMapfvARB',
 148         'glGetnPixelMapuivARB',
 149         'glGetnPixelMapusvARB',
 150         'glGetnPolygonStippleARB',
 151         'glGetnSeparableFilterARB',
 152         'glGetnTexImageARB',
 153         'glReadnPixelsARB',
 154     ])
 155
 156     map_function_names = set([
 157         'glMapBuffer',
 158         'glMapBufferARB',
 159         'glMapBufferOES',
 160         'glMapBufferRange',
 161         'glMapNamedBufferEXT',
 162         'glMapNamedBufferRangeEXT',
 163         'glMapObjectBufferATI',
 164     ])
 165
 166     unmap_function_names = set([
 167         'glUnmapBuffer',
 168         'glUnmapBufferARB',
 169         'glUnmapBufferOES',
 170         'glUnmapNamedBufferEXT',
 171         'glUnmapObjectBufferATI',
 172     ])
 173
 174     def retraceFunctionBody(self, function):
 175         is_array_pointer = function.name in self.array_pointer_function_names
 176         is_draw_array = function.name in self.draw_array_function_names
 177         is_draw_elements = function.name in self.draw_elements_function_names
 178         is_misc_draw = function.name in self.misc_draw_function_names
 179
 180         if is_array_pointer or is_draw_array or is_draw_elements:
 181             print '    if (retrace::parser.version < 1) {'
 182
 183             if is_array_pointer or is_draw_array:
 184                 print '        GLint _array_buffer = 0;'
 185                 print '        glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &_array_buffer);'
 186                 print '        if (!_array_buffer) {'
 187                 self.failFunction(function)
 188                 print '        }'
 189
 190             if is_draw_elements:
 191                 print '        GLint _element_array_buffer = 0;'
 192                 print '        glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &_element_array_buffer);'
 193                 print '        if (!_element_array_buffer) {'
 194                 self.failFunction(function)
 195                 print '        }'
 196
 197             print '    }'
 198
 199         # When no pack buffer object is bound, the pack functions are no-ops.
 200         if function.name in self.pack_function_names:
 201             print '    GLint _pack_buffer = 0;'
 202             print '    glGetIntegerv(GL_PIXEL_PACK_BUFFER_BINDING, &_pack_buffer);'
 203             print '    if (!_pack_buffer) {'
 204             print '        return;'
 205             print '    }'
 206
 207         # Pre-snapshots
 208         if function.name in self.bind_framebuffer_function_names:
 209             print '    assert(call.flags & trace::CALL_FLAG_SWAP_RENDERTARGET);'
 210         if function.name == 'glFrameTerminatorGREMEDY':
 211             print '    glretrace::frame_complete(call);'
 212             return
 213
 214         Retracer.retraceFunctionBody(self, function)
 215
 216         # Post-snapshots
 217         if function.name in ('glFlush', 'glFinish'):
 218             print '    if (!retrace::doubleBuffer) {'
 219             print '        glretrace::frame_complete(call);'
 220             print '    }'
 221         if is_draw_array or is_draw_elements or is_misc_draw:
 222             print '    assert(call.flags & trace::CALL_FLAG_RENDER);'
 223
 224
 225     def invokeFunction(self, function):
 226         # Infer the drawable size from GL calls
 227         if function.name == "glViewport":
 228             print '    glretrace::updateDrawable(x + width, y + height);'
 229         if function.name == "glViewportArray":
 230             # We are concerned about drawables so only care for the first viewport
 231             print '    if (first == 0 && count > 0) {'
 232             print '        GLfloat x = v[0], y = v[1], w = v[2], h = v[3];'
 233             print '        glretrace::updateDrawable(x + w, y + h);'
 234             print '    }'
 235         if function.name == "glViewportIndexedf":
 236             print '    if (index == 0) {'
 237             print '        glretrace::updateDrawable(x + w, y + h);'
 238             print '    }'
 239         if function.name == "glViewportIndexedfv":
 240             print '    if (index == 0) {'
 241             print '        GLfloat x = v[0], y = v[1], w = v[2], h = v[3];'
 242             print '        glretrace::updateDrawable(x + w, y + h);'
 243             print '    }'
 244         if function.name in ('glBlitFramebuffer', 'glBlitFramebufferEXT'):
 245             # Some applications do all their rendering in a framebuffer, and
 246             # then just blit to the drawable without ever calling glViewport.
 247             print '    glretrace::updateDrawable(std::max(dstX0, dstX1), std::max(dstY0, dstY1));'
 248
 249         if function.name == "glEnd":
 250             print '    glretrace::insideGlBeginEnd = false;'
 251
 252         if function.name.startswith('gl') and not function.name.startswith('glX'):
 253             print r'    if (retrace::debug && !glretrace::currentContext) {'
 254             print r'        retrace::warning(call) << "no current context\n";'
 255             print r'    }'
 256
 257         if function.name == 'memcpy':
 258             print '    if (!dest || !src || !n) return;'
 259
 260         # Skip glEnable/Disable(GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB) as we don't
 261         # faithfully set the CONTEXT_DEBUG_BIT_ARB flags on context creation.
 262         if function.name in ('glEnable', 'glDisable'):
 263             print '    if (cap == GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB) return;'
 264
 265         # Destroy the buffer mapping
 266         if function.name in self.unmap_function_names:
 267             print r'        GLvoid *ptr = NULL;'
 268             if function.name == 'glUnmapBuffer':
 269                 print r'            glGetBufferPointerv(target, GL_BUFFER_MAP_POINTER, &ptr);'
 270             elif function.name == 'glUnmapBufferARB':
 271                 print r'            glGetBufferPointervARB(target, GL_BUFFER_MAP_POINTER_ARB, &ptr);'
 272             elif function.name == 'glUnmapBufferOES':
 273                 print r'            glGetBufferPointervOES(target, GL_BUFFER_MAP_POINTER_OES, &ptr);'
 274             elif function.name == 'glUnmapNamedBufferEXT':
 275                 print r'            glGetNamedBufferPointervEXT(buffer, GL_BUFFER_MAP_POINTER, &ptr);'
 276             elif function.name == 'glUnmapObjectBufferATI':
 277                 # TODO
 278                 pass
 279             else:
 280                 assert False
 281             print r'        if (ptr) {'
 282             print r'            retrace::delRegionByPointer(ptr);'
 283             print r'        } else {'
 284             print r'            retrace::warning(call) << "no current context\n";'
 285             print r'        }'
 286
 287         if function.name in ('glBindProgramPipeline', 'glBindProgramPipelineEXT'):
 288             # Note if glBindProgramPipeline has ever been called
 289             print r'    if (pipeline) {'
 290             print r'        _pipelineHasBeenBound = true;'
 291             print r'    }'
 292
 293         profileDraw = (
 294             function.name in self.draw_array_function_names or
 295             function.name in self.draw_elements_function_names or
 296             function.name in self.draw_indirect_function_names or
 297             function.name in self.misc_draw_function_names or
 298             function.name == 'glBegin'
 299         )
 300
 301         if function.name in ('glUseProgram', 'glUseProgramObjectARB'):
 302             print r'    glretrace::setActiveProgram((call.arg(0)).toUInt());'
 303
 304         # Only profile if not inside a list as the queries get inserted into list
 305         if function.name == 'glNewList':
 306             print r'    glretrace::insideList = true;'
 307
 308         if function.name == 'glEndList':
 309             print r'    glretrace::insideList = false;'
 310
 311         if profileDraw and function.name != 'glEnd':
 312             print r'    if (!glretrace::insideList && !glretrace::insideGlBeginEnd && retrace::profiling) {'
 313             print r'        glretrace::beginProfile(call);'
 314             print r'    }'
 315
 316         if function.name == 'glCreateShaderProgramv':
 317             # When dumping state, break down glCreateShaderProgramv so that the
 318             # shader source can be recovered.
 319             print r'    if (retrace::dumpingState) {'
 320             print r'        GLuint _shader = glCreateShader(type);'
 321             print r'        if (_shader) {'
 322             print r'            glShaderSource(_shader, count, strings, NULL);'
 323             print r'            glCompileShader(_shader);'
 324             print r'            const GLuint _program = glCreateProgram();'
 325             print r'            if (_program) {'
 326             print r'                GLint compiled = GL_FALSE;'
 327             print r'                glGetShaderiv(_shader, GL_COMPILE_STATUS, &compiled);'
 328             print r'                glProgramParameteri(_program, GL_PROGRAM_SEPARABLE, GL_TRUE);'
 329             print r'                if (compiled) {'
 330             print r'                    glAttachShader(_program, _shader);'
 331             print r'                    glLinkProgram(_program);'
 332             print r'                    //glDetachShader(_program, _shader);'
 333             print r'                }'
 334             print r'                //append-shader-info-log-to-program-info-log'
 335             print r'            }'
 336             print r'            //glDeleteShader(_shader);'
 337             print r'            _result = _program;'
 338             print r'        } else {'
 339             print r'            _result = 0;'
 340             print r'        }'
 341             print r'    } else {'
 342             Retracer.invokeFunction(self, function)
 343             print r'    }'
 344         else:
 345             Retracer.invokeFunction(self, function)
 346
 347         if profileDraw or function.name == 'glEnd':
 348             print r'    if (!glretrace::insideList && !glretrace::insideGlBeginEnd && retrace::profiling) {'
 349             print r'        glretrace::endProfile(call);'
 350             print r'    }'
 351
 352         # Error checking
 353         if function.name == "glBegin":
 354             print '    glretrace::insideGlBeginEnd = true;'
 355         elif function.name.startswith('gl'):
 356             # glGetError is not allowed inside glBegin/glEnd
 357             print '    if (retrace::debug && !glretrace::insideGlBeginEnd) {'
 358             print '        glretrace::checkGlError(call);'
 359             if function.name in ('glProgramStringARB', 'glProgramStringNV'):
 360                 print r'        GLint error_position = -1;'
 361                 print r'        glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &error_position);'
 362                 print r'        if (error_position != -1) {'
 363                 print r'            const char *error_string = (const char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB);'
 364                 print r'            retrace::warning(call) << error_string << "\n";'
 365                 print r'        }'
 366             if function.name == 'glCompileShader':
 367                 print r'        GLint compile_status = 0;'
 368                 print r'        glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_status);'
 369                 print r'        if (!compile_status) {'
 370                 print r'             GLint info_log_length = 0;'
 371                 print r'             glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_log_length);'
 372                 print r'             GLchar *infoLog = new GLchar[info_log_length];'
 373                 print r'             glGetShaderInfoLog(shader, info_log_length, NULL, infoLog);'
 374                 print r'             retrace::warning(call) << infoLog << "\n";'
 375                 print r'             delete [] infoLog;'
 376                 print r'        }'
 377             if function.name in ('glLinkProgram', 'glCreateShaderProgramv', 'glCreateShaderProgramEXT'):
 378                 if function.name != 'glLinkProgram':
 379                     print r'        GLuint program = _result;'
 380                 print r'        GLint link_status = 0;'
 381                 print r'        glGetProgramiv(program, GL_LINK_STATUS, &link_status);'
 382                 print r'        if (!link_status) {'
 383                 print r'             GLint info_log_length = 0;'
 384                 print r'             glGetProgramiv(program, GL_INFO_LOG_LENGTH, &info_log_length);'
 385                 print r'             GLchar *infoLog = new GLchar[info_log_length];'
 386                 print r'             glGetProgramInfoLog(program, info_log_length, NULL, infoLog);'
 387                 print r'             retrace::warning(call) << infoLog << "\n";'
 388                 print r'             delete [] infoLog;'
 389                 print r'        }'
 390             if function.name == 'glCompileShaderARB':
 391                 print r'        GLint compile_status = 0;'
 392                 print r'        glGetObjectParameterivARB(shaderObj, GL_OBJECT_COMPILE_STATUS_ARB, &compile_status);'
 393                 print r'        if (!compile_status) {'
 394                 print r'             GLint info_log_length = 0;'
 395                 print r'             glGetObjectParameterivARB(shaderObj, GL_OBJECT_INFO_LOG_LENGTH_ARB, &info_log_length);'
 396                 print r'             GLchar *infoLog = new GLchar[info_log_length];'
 397                 print r'             glGetInfoLogARB(shaderObj, info_log_length, NULL, infoLog);'
 398                 print r'             retrace::warning(call) << infoLog << "\n";'
 399                 print r'             delete [] infoLog;'
 400                 print r'        }'
 401             if function.name == 'glLinkProgramARB':
 402                 print r'        GLint link_status = 0;'
 403                 print r'        glGetObjectParameterivARB(programObj, GL_OBJECT_LINK_STATUS_ARB, &link_status);'
 404                 print r'        if (!link_status) {'
 405                 print r'             GLint info_log_length = 0;'
 406                 print r'             glGetObjectParameterivARB(programObj, GL_OBJECT_INFO_LOG_LENGTH_ARB, &info_log_length);'
 407                 print r'             GLchar *infoLog = new GLchar[info_log_length];'
 408                 print r'             glGetInfoLogARB(programObj, info_log_length, NULL, infoLog);'
 409                 print r'             retrace::warning(call) << infoLog << "\n";'
 410                 print r'             delete [] infoLog;'
 411                 print r'        }'
 412             if function.name in self.map_function_names:
 413                 print r'        if (!_result) {'
 414                 print r'             retrace::warning(call) << "failed to map buffer\n";'
 415                 print r'        }'
 416             if function.name in self.unmap_function_names and function.type is not stdapi.Void:
 417                 print r'        if (!_result) {'
 418                 print r'             retrace::warning(call) << "failed to unmap buffer\n";'
 419                 print r'        }'
 420             if function.name in ('glGetAttribLocation', 'glGetAttribLocationARB'):
 421                 print r'    GLint _origResult = call.ret->toSInt();'
 422                 print r'    if (_result != _origResult) {'
 423                 print r'        retrace::warning(call) << "vertex attrib location mismatch " << _origResult << " -> " << _result << "\n";'
 424                 print r'    }'
 425             if function.name in ('glCheckFramebufferStatus', 'glCheckFramebufferStatusEXT', 'glCheckNamedFramebufferStatusEXT'):
 426                 print r'    GLint _origResult = call.ret->toSInt();'
 427                 print r'    if (_origResult == GL_FRAMEBUFFER_COMPLETE &&'
 428                 print r'        _result != GL_FRAMEBUFFER_COMPLETE) {'
 429                 print r'        retrace::warning(call) << "incomplete framebuffer (" << glstate::enumToString(_result) << ")\n";'
 430                 print r'    }'
 431             print '    }'
 432
 433         # Query the buffer length for whole buffer mappings
 434         if function.name in self.map_function_names:
 435             if 'length' in function.argNames():
 436                 assert 'BufferRange' in function.name
 437             else:
 438                 assert 'BufferRange' not in function.name
 439                 print r'    GLint length = 0;'
 440                 if function.name in ('glMapBuffer', 'glMapBufferOES'):
 441                     print r'    glGetBufferParameteriv(target, GL_BUFFER_SIZE, &length);'
 442                 elif function.name == 'glMapBufferARB':
 443                     print r'    glGetBufferParameterivARB(target, GL_BUFFER_SIZE_ARB, &length);'
 444                 elif function.name == 'glMapNamedBufferEXT':
 445                     print r'    glGetNamedBufferParameterivEXT(buffer, GL_BUFFER_SIZE, &length);'
 446                 elif function.name == 'glMapObjectBufferATI':
 447                     print r'    glGetObjectBufferivATI(buffer, GL_OBJECT_BUFFER_SIZE_ATI, &length);'
 448                 else:
 449                     assert False
 450
 451     def extractArg(self, function, arg, arg_type, lvalue, rvalue):
 452         if function.name in self.array_pointer_function_names and arg.name == 'pointer':
 453             print '    %s = static_cast<%s>(retrace::toPointer(%s, true));' % (lvalue, arg_type, rvalue)
 454             return
 455
 456         if function.name in self.draw_elements_function_names and arg.name == 'indices' or\
 457            function.name in self.draw_indirect_function_names and arg.name == 'indirect':
 458             self.extractOpaqueArg(function, arg, arg_type, lvalue, rvalue)
 459             return
 460
 461         # Handle pointer with offsets into the current pack pixel buffer
 462         # object.
 463         if function.name in self.pack_function_names and arg.output:
 464             assert isinstance(arg_type, (stdapi.Pointer, stdapi.Array, stdapi.Blob, stdapi.Opaque))
 465             print '    %s = static_cast<%s>((%s).toPointer());' % (lvalue, arg_type, rvalue)
 466             return
 467
 468         if arg.type is glapi.GLlocation \
 469            and 'program' not in function.argNames():
 470             # Determine the active program for uniforms swizzling
 471             print '    GLint program = -1;'
 472             print '    GLint pipeline = 0;'
 473             print '    if (_pipelineHasBeenBound) {'
 474             print '        glGetIntegerv(GL_PROGRAM_PIPELINE_BINDING, &pipeline);'
 475             print '    }'
 476             print '    if (pipeline) {'
 477             print '        glGetProgramPipelineiv(pipeline, GL_ACTIVE_PROGRAM, &program);'
 478             print '    } else {'
 479             print '        glGetIntegerv(GL_CURRENT_PROGRAM, &program);'
 480             print '    }'
 481             print
 482
 483         if arg.type is glapi.GLlocationARB \
 484            and 'programObj' not in function.argNames():
 485             print '    GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);'
 486
 487         Retracer.extractArg(self, function, arg, arg_type, lvalue, rvalue)
 488
 489         # Don't try to use more samples than the implementation supports
 490         if arg.name == 'samples':
 491             assert arg.type is glapi.GLsizei
 492             print '    GLint max_samples = 0;'
 493             print '    glGetIntegerv(GL_MAX_SAMPLES, &max_samples);'
 494             print '    if (samples > max_samples) {'
 495             print '        samples = max_samples;'
 496             print '    }'
 497
 498         # These parameters are referred beyond the call life-time
 499         # TODO: Replace ad-hoc solution for bindable parameters with general one
 500         if function.name in ('glFeedbackBuffer', 'glSelectBuffer') and arg.output:
 501             print '    _allocator.bind(%s);' % arg.name
 502
 503
 504
 505 if __name__ == '__main__':
 506     print r'''
 507 #include <string.h>
 508
 509 #include "glproc.hpp"
 510 #include "glretrace.hpp"
 511 #include "glstate.hpp"
 512
 513
 514 static bool _pipelineHasBeenBound = false;
 515 '''
 516     api = glapi.glapi
 517     api.addApi(glesapi.glesapi)
 518     retracer = GlRetracer()
 519     retracer.retraceApi(api)