bool MiniMapMaker::outputTextures(void)
{
// 如果需要（纹理大小改变了或第一次输出文件时），就重建render texture
if (mNeedRecreate)
{
destroy();
init();
}
mTempOutputFileNames.clear();
static const String TEMP_GROUP_NAME = "#TEMP#";
// 创建临时的资源组
Ogre::ResourceGroupManager& rgm = Ogre::ResourceGroupManager::getSingleton();
rgm.addResourceLocation(mPath, "FileSystem", TEMP_GROUP_NAME, false);
// 合并所有物体的包围盒
Ogre::AxisAlignedBox aabb;
Ogre::SceneManager::MovableObjectIterator itm =
mManipulator->getSceneManager()->getMovableObjectIterator(Ogre::EntityFactory::FACTORY_TYPE_NAME);
while (itm.hasMoreElements())
{
Ogre::MovableObject* movable = itm.getNext();
aabb.merge(movable->getWorldBoundingBox(true));
}
mCamera->setFarClipDistance(mCamera->getNearClipDistance() + 2 * (aabb.getMaximum().y - aabb.getMinimum().y ));
mCamera->setNearClipDistance(mTileSize/2);
// 设置摄像机的高度
Real yPos = mCamera->getNearClipDistance() + aabb.getMaximum().y;
TerrainData* terrainData = mManipulator->getTerrainData();
assert (terrainData);
float terrainHeight = terrainData->mMaxZ - terrainData->mMinZ;
float terrainWidth = terrainData->mMaxX - terrainData->mMinX;
// 投影的真正面积
Real projectSize = 0.0f;
// 最终切割成小块纹理的块数
int xIndex = 0;
int zIndex = 0;
Ogre::Vector3 originPoint(Ogre::Vector3::ZERO);
if (mUseRealCameraAngle)
{
float outerSquareWidth = 0.0f;
float outerSquareHeight = 0.0f;
Ogre::Radian alphaAngle = Ogre::Math::ATan( Ogre::Math::Abs(mMoveZDir.z / mMoveZDir.x) );
switch (mCameraDirQuadrant)
{
case WestNorth :
{
float leftWidth = Ogre::Math::Sin(alphaAngle) * terrainHeight;
float rightWidth = Ogre::Math::Cos(alphaAngle) * terrainWidth;
outerSquareWidth = leftWidth + rightWidth;
float topHeight = Ogre::Math::Cos(alphaAngle) * terrainHeight;
float bottomHeight = Ogre::Math::Sin(alphaAngle) * terrainWidth;
outerSquareHeight = topHeight + bottomHeight;
originPoint = Ogre::Vector3(terrainData->mMinX,0,terrainData->mMinZ) +
(-mMoveZDir * leftWidth);
float projectOffset = yPos / Ogre::Math::Tan(mCamDirAngle);
originPoint.x += (mInvertCameraDir * projectOffset ).x;
originPoint.z += (mInvertCameraDir * projectOffset ).z;
break;
}
case EastNorth :
{
float leftWidth = Ogre::Math::Cos(alphaAngle) * terrainWidth;
float rightWidth = Ogre::Math::Sin(alphaAngle) * terrainHeight;
outerSquareWidth = leftWidth + rightWidth;
float topHeight = Ogre::Math::Cos(alphaAngle) * terrainHeight;
float bottomHeight = Ogre::Math::Sin(alphaAngle) * terrainWidth;
outerSquareHeight = topHeight + bottomHeight;
originPoint = Ogre::Vector3(terrainData->mMaxX,0,terrainData->mMinZ) +
(-mMoveZDir * leftWidth);
float projectOffset = yPos / Ogre::Math::Tan(mCamDirAngle);
originPoint.x += (mInvertCameraDir * projectOffset ).x;
originPoint.z += (mInvertCameraDir * projectOffset ).z;
break;
}
case EastSouth :
{
float leftWidth = Ogre::Math::Sin(alphaAngle) * terrainHeight;
float rightWidth = Ogre::Math::Cos(alphaAngle) * terrainWidth;
outerSquareWidth = leftWidth + rightWidth;
float topHeight = Ogre::Math::Sin(alphaAngle) * terrainWidth;
float bottomHeight = Ogre::Math::Cos(alphaAngle) * terrainHeight;
outerSquareHeight = topHeight + bottomHeight;
originPoint = Ogre::Vector3(terrainData->mMaxX,0,terrainData->mMaxZ) +
(-mMoveZDir * topHeight);
float projectOffset = yPos / Ogre::Math::Tan(mCamDirAngle);
originPoint.x += (mInvertCameraDir * projectOffset ).x;
originPoint.z += (mInvertCameraDir * projectOffset ).z;
break;
}
case WestSouth :
{
float leftWidth = Ogre::Math::Sin(alphaAngle) * terrainHeight;
float rightWidth = Ogre::Math::Cos(alphaAngle) * terrainWidth;
outerSquareWidth = leftWidth + rightWidth;
float topHeight = Ogre::Math::Sin(alphaAngle) * terrainWidth;
float bottomHeight = Ogre::Math::Cos(alphaAngle) * terrainHeight;
outerSquareHeight = topHeight + bottomHeight;
originPoint = Ogre::Vector3(terrainData->mMinX,0,terrainData->mMaxZ) +
(-mMoveZDir * rightWidth);
float projectOffset = yPos / Ogre::Math::Tan(mCamDirAngle);
originPoint.x += (mInvertCameraDir * projectOffset ).x;
originPoint.z += (mInvertCameraDir * projectOffset ).z;
break;
}
default:
{
OGRE_EXCEPT(Ogre::Exception::ERR_INTERNAL_ERROR,
" wrong camera dir " + Ogre::StringConverter::toString(mCameraDir),
"MiniMapMaker::outputTextures");
break;
}
}
// 计算投影的长度
Real factor = Ogre::Math::Sin(mCamDirAngle);
if (factor > 0.0f && factor != 1.0f)
projectSize = mTileSize / factor;
// 根据当前场景的大小，计算需要的分块数
xIndex = Ogre::Math::Ceil( (outerSquareWidth) / mTileSize ) + 1;
zIndex = Ogre::Math::Ceil( (outerSquareHeight) / projectSize ) + 1;
}
else
{
xIndex = Ogre::Math::Ceil( (terrainData->mMaxX - terrainData->mMinX) / mTileSize ) + 1;
zIndex = Ogre::Math::Ceil( (terrainData->mMaxZ - terrainData->mMinZ) / mTileSize ) + 1;
originPoint.x = terrainData->mMinX;
originPoint.z = terrainData->mMinZ;
}
// 计算最终的mini map的大小
uint miniMapWidth = xIndex * mTexWidth;
uint miniMapHeight = zIndex * mTexHeight;
if ( miniMapWidth > 10000 || miniMapHeight > 10000 )
{
mLastErrorString = "texture size is out of range!";
return false;
}
// 创建mini map所需的内存空间
uchar* miniMapData = new uchar[miniMapWidth * miniMapHeight * Ogre::PixelUtil::getNumElemBytes(mOutPutFormat)];
//// 初始的摄像机位置
Real xPos = originPoint.x;
Real zPos = originPoint.z;
for ( int i=0; i<xIndex; ++i )
{
for ( int j=0; j<zIndex; ++j )
{
// 设置摄像机位置，并更新render texture的内容
mCamera->setPosition(xPos, yPos, zPos);
mRenderTexture->update();
String fileName = mPath + mSceneBaseName + Ogre::StringConverter::toString(i)
+ "_" + Ogre::StringConverter::toString(j) + "." + mTexExtension;
// 输出小纹理文件
mRenderTexture->writeContentsToFile(fileName);
mTempOutputFileNames.push_back(fileName);
// 读取刚创建的纹理
Ogre::Image* tempImage = new Ogre::Image;
tempImage->load(mSceneBaseName + Ogre::StringConverter::toString(i)
+ "_" + Ogre::StringConverter::toString(j) + "." + mTexExtension, TEMP_GROUP_NAME);
// 获取render texture中的内容
uchar* tempImageData = tempImage->getData();
// 定位在mini map中的左上角
uint miniMapIndex = ( j * mTexHeight * miniMapWidth + i * mTexWidth ) * Ogre::PixelUtil::getNumElemBytes(mOutPutFormat);
uchar* startData = miniMapData + miniMapIndex;
for ( size_t height = 0; height < tempImage->getHeight(); ++height )
{
for ( size_t width = 0; width < tempImage->getWidth(); ++width )
{
memcpy(startData, tempImageData, Ogre::PixelUtil::getNumElemBytes(mOutPutFormat));
startData += Ogre::PixelUtil::getNumElemBytes(mOutPutFormat);
tempImageData += Ogre::PixelUtil::getNumElemBytes( tempImage->getFormat() );
}
startData += (miniMapWidth - tempImage->getWidth()) * Ogre::PixelUtil::getNumElemBytes(mOutPutFormat);
}
delete tempImage;
// 移动摄像机的z坐标
if (mUseRealCameraAngle)
{
zPos += (mInvertCameraDir * (projectSize)).z;
xPos += (mInvertCameraDir * (projectSize)).x;
}
else
zPos += mTileSize;
}
if (mUseRealCameraAngle)
{
xPos = originPoint.x;
zPos = originPoint.z;
xPos += (mMoveZDir * (mTileSize) * (i+1)).x;
zPos += (mMoveZDir * (mTileSize) * (i+1)).z;
}
else
{
// 操作完每一列之后，重置摄像机的z坐标
zPos = terrainData->mMinZ;
// 移动摄像机的x坐标
xPos += mTileSize;
}
}
// 保存mini map并输出
Ogre::Image* miniMapImage = new Ogre::Image;
miniMapImage->loadDynamicImage(miniMapData, miniMapWidth, miniMapHeight, 1, mOutPutFormat, true);
miniMapImage->save(mPath + mOutFileName + "." + mTexExtension);
delete miniMapImage;
rgm.destroyResourceGroup(TEMP_GROUP_NAME);
return true;
}
BoundingBox<real> getOgreWorldBoundingBox() const {
return mOgreObject ? fromOgre<real>(mOgreObject->getWorldBoundingBox()) : BoundingBox<real>::null();
}
