kc3-lang/angle/src/libGLESv2/D3DConstantTable.cpp

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• Author : apatrick@chromium.org
  Date : 2012-09-05 22:26:10
  Hash : 60dafe8f
  Message : Implement D3DConstantTable. Remove ProgramBinary dependencies on D3DX. Review URL: https://codereview.appspot.com/6485061 git-svn-id: https://angleproject.googlecode.com/svn/trunk@1271 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/libGLESv2/D3DConstantTable.cpp

• //
  // Copyright (c) 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.
  //
  
  // D3DConstantTable.cpp: Implements the D3DConstantTable class which parses
  // information about constants from the CTAB comment in a D3D shader blob.
  // Restructures the constant table as a hierarchy of constants in the same
  // way as D3DX.
  
  #include "libGLESv2/D3DConstantTable.h"
  
  #include <d3d9.h>
  #include <d3d9types.h>
  #include <windows.h>
  #include <mmsystem.h>
  
  #include "libGLESv2/BinaryStream.h"
  
  const static int SHADER_VERSION_MASK = D3DVS_VERSION(0, 0);
  const static int FOURCC_CTAB = MAKEFOURCC('C','T','A','B');
  
  namespace gl
  {
  // These structs and constants correspond to the format of the constant table in a shader binary.
  // They match the corresponding structures in d3dx9shader.h.
  namespace ctab
  {
  struct ConstantTable
  {
      DWORD size;
      DWORD creator;
      DWORD version;
      DWORD constants;
      DWORD constantInfos;
      DWORD flags;
      DWORD target;
  };
  
  struct ConstantInfo
  {
      DWORD name;
      WORD registerSet;
      WORD registerIndex;
      WORD registerCount;
      WORD reserved;
      DWORD typeInfo;
      DWORD defaultValue;
  };
  
  struct TypeInfo
  {
      WORD typeClass;
      WORD type;
      WORD rows;
      WORD columns;
      WORD elements;
      WORD structMembers;
      DWORD structMemberInfos;
  };
  
  struct StructMemberInfo
  {
      DWORD name;
      DWORD typeInfo;
  };
  }
  
  D3DConstant::D3DConstant(const char *base, const ctab::ConstantInfo *constantInfo)
  {
      const ctab::TypeInfo *typeInfo = reinterpret_cast<const ctab::TypeInfo*>(base + constantInfo->typeInfo);
  
      name = base + constantInfo->name;
      registerSet = static_cast<RegisterSet>(constantInfo->registerSet);
      registerIndex = constantInfo->registerIndex;
      registerCount = constantInfo->registerCount;
      typeClass = static_cast<Class>(typeInfo->typeClass);
      type = static_cast<Type>(typeInfo->type);
      rows = typeInfo->rows;
      columns = typeInfo->columns;
      elements = typeInfo->elements;
  
      if (typeClass == CLASS_STRUCT)
      {
          addStructMembers(base, registerSet, registerIndex, typeInfo);
      }
  }
  
  D3DConstant::D3DConstant(const char *base, RegisterSet registerSet, unsigned registerIndex, const ctab::StructMemberInfo *memberInfo)
      : registerSet(registerSet), registerIndex(registerIndex)
  {
      const ctab::TypeInfo *typeInfo = reinterpret_cast<const ctab::TypeInfo*>(base + memberInfo->typeInfo);
  
      name = base + memberInfo->name;
      registerCount = typeInfo->rows * typeInfo->elements;
      typeClass = static_cast<Class>(typeInfo->typeClass);
      type = static_cast<Type>(typeInfo->type);
      rows = typeInfo->rows;
      columns = typeInfo->columns;
      elements = typeInfo->elements;
  
      if (typeClass == CLASS_STRUCT)
      {
          registerCount = addStructMembers(base, registerSet, registerIndex, typeInfo);
      }
  }
  
  D3DConstant::~D3DConstant()
  {
      for (size_t j = 0; j < structMembers.size(); ++j)
      {
          for (size_t i = 0; i < structMembers[j].size(); ++i)
          {
              delete structMembers[j][i];
          }
      }
  }
  
  unsigned D3DConstant::addStructMembers(const char *base, RegisterSet registerSet, unsigned registerIndex, const ctab::TypeInfo *typeInfo)
  {
      const ctab::StructMemberInfo *memberInfos = reinterpret_cast<const ctab::StructMemberInfo*>(
          base + typeInfo->structMemberInfos);
  
      unsigned memberIndex = registerIndex;
  
      structMembers.resize(elements);
  
      for (unsigned j = 0; j < elements; ++j)
      {
          structMembers[j].resize(typeInfo->structMembers);
  
          for (unsigned i = 0; i < typeInfo->structMembers; ++i)
          {
              const ctab::TypeInfo *memberTypeInfo = reinterpret_cast<const ctab::TypeInfo*>(
                  base + memberInfos[i].typeInfo);
  
              D3DConstant *member = new D3DConstant(base, registerSet, memberIndex, memberInfos + i);
              memberIndex += member->registerCount;
  
              structMembers[j][i] = member;
          }
      }
  
      return memberIndex - registerIndex;
  }
  
  D3DConstantTable::D3DConstantTable(void *blob, size_t size) : mError(false)
  {
      BinaryInputStream stream(blob, size);
  
      int version;
      stream.read(&version);
      if ((version & SHADER_VERSION_MASK) != SHADER_VERSION_MASK)
      {
          mError = true;
          return;
      }
  
      const ctab::ConstantTable* constantTable = NULL;
  
      while (!stream.error())
      {
          int token;
          stream.read(&token);
  
          if ((token & D3DSI_OPCODE_MASK) == D3DSIO_COMMENT)
          {
              size_t length = ((token & D3DSI_COMMENTSIZE_MASK) >> D3DSI_COMMENTSIZE_SHIFT) * sizeof(DWORD);
  
              int fourcc;
              stream.read(&fourcc);
              if (fourcc == FOURCC_CTAB)
              {
                  constantTable = reinterpret_cast<const ctab::ConstantTable*>(static_cast<const char*>(blob) + stream.offset());
                  break;
              }
  
              stream.skip(length - sizeof(fourcc));
          }
          else if (token == D3DSIO_END)
          {
              break;
          }
      }
  
      mError = !constantTable || stream.error();
      if (mError)
      {
          return;
      }
  
      const char *base = reinterpret_cast<const char*>(constantTable);
  
      mConstants.resize(constantTable->constants);
      const ctab::ConstantInfo *constantInfos =
          reinterpret_cast<const ctab::ConstantInfo*>(base + constantTable->constantInfos);
      for (size_t i = 0; i < constantTable->constants; ++i)
      {
          mConstants[i] = new D3DConstant(base, constantInfos + i);
      }
  }
  
  D3DConstantTable::~D3DConstantTable()
  {
      for (size_t i = 0; i < mConstants.size(); ++i)
      {
          delete mConstants[i];
      }
  }
  
  const D3DConstant *D3DConstantTable::getConstant(unsigned index) const
  {
      return mConstants[index];
  }
  
  const D3DConstant *D3DConstantTable::getConstantByName(const char *name) const
  {
      for (size_t i = 0; i < mConstants.size(); ++i)
      {
          const D3DConstant *constant = getConstant(i);
          if (constant->name == name)
          {
              return constant;
          }
      }
  
      return NULL;
  }
  
  }