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

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• Hash : aa0a5446
  Author :
  Date : 2017-05-25T13:30:23
  

  Ensure gl State structs are zero filled.
  
  In some cases we would hash or memcmp against structs with bools or
  other non-filled data. This could have implementation differences,
  and may have been causing cache errors on Clang.
  
  BUG=chromium:721648
  BUG=angleproject:2044
  
  Change-Id: I981a1e6e8d50a33f7fade568497b72b919accfce
  Reviewed-on: https://chromium-review.googlesource.com/516383
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/angletypes.cpp

• //
  // Copyright (c) 2013 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.
  //
  
  // angletypes.h : Defines a variety of structures and enum types that are used throughout libGLESv2
  
  #include "libANGLE/angletypes.h"
  #include "libANGLE/Program.h"
  #include "libANGLE/VertexAttribute.h"
  #include "libANGLE/State.h"
  #include "libANGLE/VertexArray.h"
  
  namespace gl
  {
  
  PrimitiveType GetPrimitiveType(GLenum drawMode)
  {
      switch (drawMode)
      {
          case GL_POINTS:
              return PRIMITIVE_POINTS;
          case GL_LINES:
              return PRIMITIVE_LINES;
          case GL_LINE_STRIP:
              return PRIMITIVE_LINE_STRIP;
          case GL_LINE_LOOP:
              return PRIMITIVE_LINE_LOOP;
          case GL_TRIANGLES:
              return PRIMITIVE_TRIANGLES;
          case GL_TRIANGLE_STRIP:
              return PRIMITIVE_TRIANGLE_STRIP;
          case GL_TRIANGLE_FAN:
              return PRIMITIVE_TRIANGLE_FAN;
          default:
              UNREACHABLE();
              return PRIMITIVE_TYPE_MAX;
      }
  }
  
  RasterizerState::RasterizerState()
  {
      memset(this, 0, sizeof(RasterizerState));
  
      rasterizerDiscard   = false;
      cullFace            = false;
      cullMode            = GL_BACK;
      frontFace           = GL_CCW;
      polygonOffsetFill   = false;
      polygonOffsetFactor = 0.0f;
      polygonOffsetUnits  = 0.0f;
      pointDrawMode       = false;
      multiSample         = false;
  }
  
  bool operator==(const RasterizerState &a, const RasterizerState &b)
  {
      return memcmp(&a, &b, sizeof(RasterizerState)) == 0;
  }
  
  bool operator!=(const RasterizerState &a, const RasterizerState &b)
  {
      return !(a == b);
  }
  
  BlendState::BlendState()
  {
      memset(this, 0, sizeof(BlendState));
  
      blend                 = false;
      sourceBlendRGB        = GL_ONE;
      sourceBlendAlpha      = GL_ONE;
      destBlendRGB          = GL_ZERO;
      destBlendAlpha        = GL_ZERO;
      blendEquationRGB      = GL_FUNC_ADD;
      blendEquationAlpha    = GL_FUNC_ADD;
      sampleAlphaToCoverage = false;
      dither                = true;
  }
  
  bool operator==(const BlendState &a, const BlendState &b)
  {
      return memcmp(&a, &b, sizeof(BlendState)) == 0;
  }
  
  bool operator!=(const BlendState &a, const BlendState &b)
  {
      return !(a == b);
  }
  
  DepthStencilState::DepthStencilState()
  {
      memset(this, 0, sizeof(DepthStencilState));
  
      depthTest                = false;
      depthFunc                = GL_LESS;
      depthMask                = true;
      stencilTest              = false;
      stencilFunc              = GL_ALWAYS;
      stencilMask              = static_cast<GLuint>(-1);
      stencilWritemask         = static_cast<GLuint>(-1);
      stencilBackFunc          = GL_ALWAYS;
      stencilBackMask          = static_cast<GLuint>(-1);
      stencilBackWritemask     = static_cast<GLuint>(-1);
      stencilFail              = GL_KEEP;
      stencilPassDepthFail     = GL_KEEP;
      stencilPassDepthPass     = GL_KEEP;
      stencilBackFail          = GL_KEEP;
      stencilBackPassDepthFail = GL_KEEP;
      stencilBackPassDepthPass = GL_KEEP;
  }
  
  bool operator==(const DepthStencilState &a, const DepthStencilState &b)
  {
      return memcmp(&a, &b, sizeof(DepthStencilState)) == 0;
  }
  
  bool operator!=(const DepthStencilState &a, const DepthStencilState &b)
  {
      return !(a == b);
  }
  
  SamplerState::SamplerState()
  {
      memset(this, 0, sizeof(SamplerState));
  
      minFilter     = GL_NEAREST_MIPMAP_LINEAR;
      magFilter     = GL_LINEAR;
      wrapS         = GL_REPEAT;
      wrapT         = GL_REPEAT;
      wrapR         = GL_REPEAT;
      maxAnisotropy = 1.0f;
      minLod        = -1000.0f;
      maxLod        = 1000.0f;
      compareMode   = GL_NONE;
      compareFunc   = GL_LEQUAL;
      sRGBDecode    = GL_DECODE_EXT;
  }
  
  // static
  SamplerState SamplerState::CreateDefaultForTarget(GLenum target)
  {
      SamplerState state;
  
      // According to OES_EGL_image_external: For external textures, the default min filter is
      // GL_LINEAR and the default s and t wrap modes are GL_CLAMP_TO_EDGE.
      if (target == GL_TEXTURE_EXTERNAL_OES)
      {
          state.minFilter = GL_LINEAR;
          state.wrapS     = GL_CLAMP_TO_EDGE;
          state.wrapT     = GL_CLAMP_TO_EDGE;
      }
  
      return state;
  }
  
  static void MinMax(int a, int b, int *minimum, int *maximum)
  {
      if (a < b)
      {
          *minimum = a;
          *maximum = b;
      }
      else
      {
          *minimum = b;
          *maximum = a;
      }
  }
  
  bool ClipRectangle(const Rectangle &source, const Rectangle &clip, Rectangle *intersection)
  {
      int minSourceX, maxSourceX, minSourceY, maxSourceY;
      MinMax(source.x, source.x + source.width, &minSourceX, &maxSourceX);
      MinMax(source.y, source.y + source.height, &minSourceY, &maxSourceY);
  
      int minClipX, maxClipX, minClipY, maxClipY;
      MinMax(clip.x, clip.x + clip.width, &minClipX, &maxClipX);
      MinMax(clip.y, clip.y + clip.height, &minClipY, &maxClipY);
  
      if (minSourceX >= maxClipX || maxSourceX <= minClipX || minSourceY >= maxClipY || maxSourceY <= minClipY)
      {
          if (intersection)
          {
              intersection->x = minSourceX;
              intersection->y = maxSourceY;
              intersection->width = maxSourceX - minSourceX;
              intersection->height = maxSourceY - minSourceY;
          }
  
          return false;
      }
      else
      {
          if (intersection)
          {
              intersection->x = std::max(minSourceX, minClipX);
              intersection->y = std::max(minSourceY, minClipY);
              intersection->width  = std::min(maxSourceX, maxClipX) - std::max(minSourceX, minClipX);
              intersection->height = std::min(maxSourceY, maxClipY) - std::max(minSourceY, minClipY);
          }
  
          return true;
      }
  }
  
  bool Box::operator==(const Box &other) const
  {
      return (x == other.x && y == other.y && z == other.z &&
              width == other.width && height == other.height && depth == other.depth);
  }
  
  bool Box::operator!=(const Box &other) const
  {
      return !(*this == other);
  }
  
  bool operator==(const Extents &lhs, const Extents &rhs)
  {
      return lhs.width == rhs.width && lhs.height == rhs.height && lhs.depth == rhs.depth;
  }
  
  bool operator!=(const Extents &lhs, const Extents &rhs)
  {
      return !(lhs == rhs);
  }
  }  // namespace gl
  

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