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

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• Author : daniel@transgaming.com
  Date : 2012-01-20 18:24:39
  Hash : 86bdb824
  Message : Adds support for EXT_occlusion_query_boolean TRAC #19360 Signed-off-by: Daniel Koch Authored-by: Shannon Woods git-svn-id: https://angleproject.googlecode.com/svn/trunk@951 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/libGLESv2/Query.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.
  //
  
  // Query.cpp: Implements the gl::Query class
  
  #include "libGLESv2/Query.h"
  
  #include "libGLESv2/main.h"
  
  namespace gl
  {
  
  Query::Query(GLuint id, GLenum type) : RefCountObject(id)
  { 
      mQuery = NULL;
      mStatus = GL_FALSE;
      mResult = GL_FALSE;
      mType = type;
  }
  
  Query::~Query()
  {
      if (mQuery != NULL)
      {
          mQuery->Release();
          mQuery = NULL;
      }
  }
  
  void Query::begin()
  {
      if (mQuery == NULL)
      {
          if (FAILED(getDevice()->CreateQuery(D3DQUERYTYPE_OCCLUSION, &mQuery)))
          {
              return error(GL_OUT_OF_MEMORY);
          }
      }
  
      HRESULT result = mQuery->Issue(D3DISSUE_BEGIN);
      ASSERT(SUCCEEDED(result));
  }
  
  void Query::end()
  {
      if (mQuery == NULL)
      {
          return error(GL_INVALID_OPERATION);
      }
  
      HRESULT result = mQuery->Issue(D3DISSUE_END);
      ASSERT(SUCCEEDED(result));
      
      mStatus = GL_FALSE;
      mResult = GL_FALSE;
  }
  
  GLuint Query::getResult()
  {
      if (mQuery != NULL)
      {
          while (!testQuery())
          {
              Sleep(0);
              // explicitly check for device loss
              // some drivers seem to return S_FALSE even if the device is lost
              // instead of D3DERR_DEVICELOST like they should
              if (gl::getDisplay()->testDeviceLost())
              {
                  gl::getDisplay()->notifyDeviceLost();
                  return error(GL_OUT_OF_MEMORY, 0);
              }
          }
      }
  
      return (GLuint)mResult;
  }
  
  GLboolean Query::isResultAvailable()
  {
      if (mQuery != NULL)
      {
          testQuery();
      }
      
      return mStatus;
  }
  
  GLenum Query::getType() const
  {
      return mType;
  }
  
  GLboolean Query::testQuery()
  {
      if (mQuery != NULL && mStatus != GL_TRUE)
      {
          DWORD numPixels = 0;
  
          HRESULT hres = mQuery->GetData(&numPixels, sizeof(DWORD), D3DGETDATA_FLUSH);
          if (hres == S_OK)
          {
              mStatus = GL_TRUE;
  
              switch (mType)
              {
                case GL_ANY_SAMPLES_PASSED_EXT:
                case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
                  mResult = (numPixels > 0) ? GL_TRUE : GL_FALSE;
                  break;
                default:
                  ASSERT(false);
              }
          }
          else if (checkDeviceLost(hres))
          {
              return error(GL_OUT_OF_MEMORY, GL_TRUE);
          }
          
          return mStatus;
      }
  
      return GL_TRUE; // prevent blocking when query is null
  }
  }