kc3-lang/angle/src/libANGLE/queryconversions.cpp

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• Author : Geoff Lang
  Date : 2014-12-03 14:46:48
  Hash : 9d9132df
  Message : Remove support for compiling libANGLE as a dynamic library. BUG=angle:733 Change-Id: Iacef45b89f234091eb5df505437adabece1e564b Reviewed-on: https://chromium-review.googlesource.com/232961 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/libANGLE/queryconversions.cpp

• //
  // Copyright (c) 2014 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.
  //
  
  // queryconversions.cpp: Implementation of state query cast conversions
  
  #include "libANGLE/Context.h"
  #include "common/utilities.h"
  
  namespace gl
  {
  
  // Helper class for converting a GL type to a GLenum:
  // We can't use CastStateValueEnum generally, because of GLboolean + GLubyte overlap.
  // We restrict our use to CastStateValue, where it eliminates duplicate parameters.
  
  template <typename GLType>
  struct CastStateValueEnum { static GLenum mEnumForType; };
  
  template <> GLenum CastStateValueEnum<GLint>::mEnumForType      = GL_INT;
  template <> GLenum CastStateValueEnum<GLuint>::mEnumForType     = GL_UNSIGNED_INT;
  template <> GLenum CastStateValueEnum<GLboolean>::mEnumForType  = GL_BOOL;
  template <> GLenum CastStateValueEnum<GLint64>::mEnumForType    = GL_INT_64_ANGLEX;
  template <> GLenum CastStateValueEnum<GLfloat>::mEnumForType    = GL_FLOAT;
  
  template <typename QueryT, typename NativeT>
  QueryT CastStateValueToInt(GLenum pname, NativeT value)
  {
      GLenum queryType = CastStateValueEnum<QueryT>::mEnumForType;
      GLenum nativeType = CastStateValueEnum<NativeT>::mEnumForType;
  
      if (nativeType == GL_FLOAT)
      {
          // RGBA color values and DepthRangeF values are converted to integer using Equation 2.4 from Table 4.5
          if (pname == GL_DEPTH_RANGE || pname == GL_COLOR_CLEAR_VALUE || pname == GL_DEPTH_CLEAR_VALUE || pname == GL_BLEND_COLOR)
          {
              return static_cast<QueryT>((static_cast<GLfloat>(0xFFFFFFFF) * value - 1.0f) / 2.0f);
          }
          else
          {
              return gl::iround<QueryT>(value);
          }
      }
  
      // Clamp 64-bit int values when casting to int
      if (nativeType == GL_INT_64_ANGLEX && queryType == GL_INT)
      {
          GLint64 minIntValue = static_cast<GLint64>(std::numeric_limits<GLint>::min());
          GLint64 maxIntValue = static_cast<GLint64>(std::numeric_limits<GLint>::max());
          GLint64 clampedValue = std::max(std::min(static_cast<GLint64>(value), maxIntValue), minIntValue);
          return static_cast<QueryT>(clampedValue);
      }
  
      return static_cast<QueryT>(value);
  }
  
  template <typename QueryT, typename NativeT>
  QueryT CastStateValue(GLenum pname, NativeT value)
  {
      GLenum queryType = CastStateValueEnum<QueryT>::mEnumForType;
  
      switch (queryType)
      {
        case GL_INT:              return CastStateValueToInt<QueryT, NativeT>(pname, value);
        case GL_INT_64_ANGLEX:    return CastStateValueToInt<QueryT, NativeT>(pname, value);
        case GL_FLOAT:            return static_cast<QueryT>(value);
        case GL_BOOL:             return (value == static_cast<NativeT>(0) ? GL_FALSE : GL_TRUE);
        default: UNREACHABLE();   return 0;
      }
  }
  
  template <typename QueryT>
  void CastStateValues(Context *context, GLenum nativeType, GLenum pname,
                       unsigned int numParams, QueryT *outParams)
  {
      if (nativeType == GL_INT)
      {
          GLint *intParams = NULL;
          intParams = new GLint[numParams];
  
          context->getIntegerv(pname, intParams);
  
          for (unsigned int i = 0; i < numParams; ++i)
          {
              outParams[i] = CastStateValue<QueryT>(pname, intParams[i]);
          }
  
          delete [] intParams;
      }
      else if (nativeType == GL_BOOL)
      {
          GLboolean *boolParams = NULL;
          boolParams = new GLboolean[numParams];
  
          context->getBooleanv(pname, boolParams);
  
          for (unsigned int i = 0; i < numParams; ++i)
          {
              outParams[i] = (boolParams[i] == GL_FALSE ? static_cast<QueryT>(0) : static_cast<QueryT>(1));
          }
  
          delete [] boolParams;
      }
      else if (nativeType == GL_FLOAT)
      {
          GLfloat *floatParams = NULL;
          floatParams = new GLfloat[numParams];
  
          context->getFloatv(pname, floatParams);
  
          for (unsigned int i = 0; i < numParams; ++i)
          {
              outParams[i] = CastStateValue<QueryT>(pname, floatParams[i]);
          }
  
          delete [] floatParams;
      }
      else if (nativeType == GL_INT_64_ANGLEX)
      {
          GLint64 *int64Params = NULL;
          int64Params = new GLint64[numParams];
  
          context->getInteger64v(pname, int64Params);
  
          for (unsigned int i = 0; i < numParams; ++i)
          {
              outParams[i] = CastStateValue<QueryT>(pname, int64Params[i]);
          }
  
          delete [] int64Params;
      }
      else UNREACHABLE();
  }
  
  // Explicit template instantiation (how we export template functions in different files)
  // The calls below will make CastStateValues successfully link with the GL state query types
  // The GL state query API types are: bool, int, uint, float, int64
  
  template void CastStateValues<GLboolean>(Context *, GLenum, GLenum, unsigned int, GLboolean *);
  template void CastStateValues<GLint>(Context *, GLenum, GLenum, unsigned int, GLint *);
  template void CastStateValues<GLuint>(Context *, GLenum, GLenum, unsigned int, GLuint *);
  template void CastStateValues<GLfloat>(Context *, GLenum, GLenum, unsigned int, GLfloat *);
  template void CastStateValues<GLint64>(Context *, GLenum, GLenum, unsigned int, GLint64 *);
  
  }