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

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• Hash : c337e7ab
  Author :
  Date : 2015-04-30T10:25:59
  

  Convert floats to integers using doubles and 64-bit integers.
  
  Avoids some edge cases that overflow or round incorrectly.
  
  Fixes:
  dEQP-GLES2.functional.state_query.floats.depth_range_getinteger
  dEQP-GLES2.functional.state_query.floats.color_clear_value_getinteger
  dEQP-GLES2.functional.state_query.floats.depth_clear_value_getinteger
  
  Change-Id: Ib2c7f422dac76094c7ff6c5f8aef3fd392f68e80
  Reviewed-on: https://chromium-review.googlesource.com/268510
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• 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;
  
  static GLint64 ExpandFloatToInteger(GLfloat value)
  {
      return static_cast<GLint64>((static_cast<double>(0xFFFFFFFFULL) * value - 1.0) / 2.0);
  }
  
  template <typename QueryT>
  static QueryT ClampToQueryRange(GLint64 value)
  {
      const GLint64 min = static_cast<GLint64>(std::numeric_limits<QueryT>::min());
      const GLint64 max = static_cast<GLint64>(std::numeric_limits<QueryT>::max());
      return static_cast<QueryT>(clamp(value, min, max));
  }
  
  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 ClampToQueryRange<QueryT>(ExpandFloatToInteger(static_cast<GLfloat>(value)));
          }
          else
          {
              return gl::iround<QueryT>(static_cast<GLfloat>(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 static_cast<QueryT>(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 *);
  
  }
  

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