kc3-lang/angle/src/compiler/translator/DirectiveHandler.cpp

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• Hash : cea86910
  Author :
  Date : 2021-01-14T08:13:00
  

  Vulkan: Support EXT_clip_cull_distance extension
  
  EXT_clip_cull_distance extension is supported except for
  some features related to EXT_tessellation_shader and
  EXT_geometry_shader. Also added a few compiler tests to validate
  the transformation from ESSL to GLSL for Vulkan backend.
  
  Bug: angleproject:5458
  Tests: angle_end2end_tests --gtest_filter=Clip*DistanceTest*
         angle_unittests --gtest_filter=*Clip*Distance*
  Change-Id: Ie74e6b2b55112ad92ad111191d629b63506032ab
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2585987
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Mohan Maiya <m.maiya@samsung.com>
  

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• src/compiler/translator/DirectiveHandler.cpp

• //
  // Copyright 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "compiler/translator/DirectiveHandler.h"
  
  #include <sstream>
  
  #include "angle_gl.h"
  #include "common/debug.h"
  #include "compiler/translator/Common.h"
  #include "compiler/translator/Diagnostics.h"
  
  namespace sh
  {
  
  static TBehavior getBehavior(const std::string &str)
  {
      const char kRequire[] = "require";
      const char kEnable[]  = "enable";
      const char kDisable[] = "disable";
      const char kWarn[]    = "warn";
  
      if (str == kRequire)
          return EBhRequire;
      else if (str == kEnable)
          return EBhEnable;
      else if (str == kDisable)
          return EBhDisable;
      else if (str == kWarn)
          return EBhWarn;
      return EBhUndefined;
  }
  
  TDirectiveHandler::TDirectiveHandler(TExtensionBehavior &extBehavior,
                                       TDiagnostics &diagnostics,
                                       int &shaderVersion,
                                       sh::GLenum shaderType,
                                       bool debugShaderPrecisionSupported)
      : mExtensionBehavior(extBehavior),
        mDiagnostics(diagnostics),
        mShaderVersion(shaderVersion),
        mShaderType(shaderType),
        mDebugShaderPrecisionSupported(debugShaderPrecisionSupported)
  {}
  
  TDirectiveHandler::~TDirectiveHandler() {}
  
  void TDirectiveHandler::handleError(const angle::pp::SourceLocation &loc, const std::string &msg)
  {
      mDiagnostics.error(loc, msg.c_str(), "");
  }
  
  void TDirectiveHandler::handlePragma(const angle::pp::SourceLocation &loc,
                                       const std::string &name,
                                       const std::string &value,
                                       bool stdgl)
  {
      if (stdgl)
      {
          const char kInvariant[] = "invariant";
          const char kAll[]       = "all";
  
          if (name == kInvariant && value == kAll)
          {
              if (mShaderVersion == 300 && mShaderType == GL_FRAGMENT_SHADER)
              {
                  // ESSL 3.00.4 section 4.6.1
                  mDiagnostics.error(
                      loc, "#pragma STDGL invariant(all) can not be used in fragment shader",
                      name.c_str());
              }
              mPragma.stdgl.invariantAll = true;
          }
          // The STDGL pragma is used to reserve pragmas for use by future
          // revisions of GLSL.  Do not generate an error on unexpected
          // name and value.
          return;
      }
      else
      {
          const char kOptimize[]             = "optimize";
          const char kDebug[]                = "debug";
          const char kDebugShaderPrecision[] = "webgl_debug_shader_precision";
          const char kOn[]                   = "on";
          const char kOff[]                  = "off";
  
          bool invalidValue = false;
          if (name == kOptimize)
          {
              if (value == kOn)
                  mPragma.optimize = true;
              else if (value == kOff)
                  mPragma.optimize = false;
              else
                  invalidValue = true;
          }
          else if (name == kDebug)
          {
              if (value == kOn)
                  mPragma.debug = true;
              else if (value == kOff)
                  mPragma.debug = false;
              else
                  invalidValue = true;
          }
          else if (name == kDebugShaderPrecision && mDebugShaderPrecisionSupported)
          {
              if (value == kOn)
                  mPragma.debugShaderPrecision = true;
              else if (value == kOff)
                  mPragma.debugShaderPrecision = false;
              else
                  invalidValue = true;
          }
          else
          {
              mDiagnostics.report(angle::pp::Diagnostics::PP_UNRECOGNIZED_PRAGMA, loc, name);
              return;
          }
  
          if (invalidValue)
          {
              mDiagnostics.error(loc, "invalid pragma value - 'on' or 'off' expected", value.c_str());
          }
      }
  }
  
  void TDirectiveHandler::handleExtension(const angle::pp::SourceLocation &loc,
                                          const std::string &name,
                                          const std::string &behavior)
  {
      const char kExtAll[] = "all";
  
      TBehavior behaviorVal = getBehavior(behavior);
      if (behaviorVal == EBhUndefined)
      {
          mDiagnostics.error(loc, "behavior invalid", name.c_str());
          return;
      }
  
      if (name == kExtAll)
      {
          if (behaviorVal == EBhRequire)
          {
              mDiagnostics.error(loc, "extension cannot have 'require' behavior", name.c_str());
          }
          else if (behaviorVal == EBhEnable)
          {
              mDiagnostics.error(loc, "extension cannot have 'enable' behavior", name.c_str());
          }
          else
          {
              for (TExtensionBehavior::iterator iter = mExtensionBehavior.begin();
                   iter != mExtensionBehavior.end(); ++iter)
                  iter->second = behaviorVal;
          }
          return;
      }
  
      TExtensionBehavior::iterator iter = mExtensionBehavior.find(GetExtensionByName(name.c_str()));
      if (iter != mExtensionBehavior.end())
      {
          iter->second = behaviorVal;
          // OVR_multiview is implicitly enabled when OVR_multiview2 is enabled
          if (name == "GL_OVR_multiview2")
          {
              constexpr char kMultiviewExtName[] = "GL_OVR_multiview";
              iter = mExtensionBehavior.find(GetExtensionByName(kMultiviewExtName));
              if (iter != mExtensionBehavior.end())
              {
                  iter->second = behaviorVal;
              }
          }
          // EXT_shader_io_blocks is implicitly enabled when EXT_geometry_shader or
          // EXT_tessellation_shader is enabled.
          if (name == "GL_EXT_geometry_shader" || name == "GL_EXT_tessellation_shader")
          {
              constexpr char kIOBlocksExtName[] = "GL_EXT_shader_io_blocks";
              iter = mExtensionBehavior.find(GetExtensionByName(kIOBlocksExtName));
              if (iter != mExtensionBehavior.end())
              {
                  iter->second = behaviorVal;
              }
          }
          // GL_APPLE_clip_distance is implicitly enabled when GL_EXT_clip_cull_distance is enabled
          else if (name == "GL_EXT_clip_cull_distance")
          {
              // This extension only can be enabled on greater than ESSL 300
              if (mShaderVersion < 300)
              {
                  mDiagnostics.error(loc, "extension can be enabled on greater than ESSL 300",
                                     name.c_str());
                  return;
              }
  
              constexpr char kAPPLEClipDistanceEXTName[] = "GL_APPLE_clip_distance";
              iter = mExtensionBehavior.find(GetExtensionByName(kAPPLEClipDistanceEXTName));
              if (iter != mExtensionBehavior.end())
              {
                  iter->second = behaviorVal;
              }
          }
          return;
      }
  
      switch (behaviorVal)
      {
          case EBhRequire:
              mDiagnostics.error(loc, "extension is not supported", name.c_str());
              break;
          case EBhEnable:
          case EBhWarn:
          case EBhDisable:
              mDiagnostics.warning(loc, "extension is not supported", name.c_str());
              break;
          default:
              UNREACHABLE();
              break;
      }
  }
  
  void TDirectiveHandler::handleVersion(const angle::pp::SourceLocation &loc,
                                        int version,
                                        ShShaderSpec spec)
  {
      if (((version == 100 || version == 300 || version == 310 || version == 320) &&
           !IsDesktopGLSpec(spec)) ||
          IsDesktopGLSpec(spec))
      {
          mShaderVersion = version;
      }
      else
      {
          std::stringstream stream = sh::InitializeStream<std::stringstream>();
          stream << version;
          std::string str = stream.str();
          mDiagnostics.error(loc, "client/version number not supported", str.c_str());
      }
  }
  
  }  // namespace sh
  

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