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531 lines
21 KiB
C++
531 lines
21 KiB
C++
#include "storage.hpp"
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#include <OgreVector2.h>
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#include <OgreTextureManager.h>
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#include <OgreStringConverter.h>
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#include <OgreRenderSystem.h>
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#include <OgreResourceGroupManager.h>
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#include <OgreResourceBackgroundQueue.h>
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#include <OgreRoot.h>
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#include <boost/algorithm/string.hpp>
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#include <components/terrain/quadtreenode.hpp>
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#include <components/misc/resourcehelpers.hpp>
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namespace ESMTerrain
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{
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bool Storage::getMinMaxHeights(float size, const Ogre::Vector2 ¢er, float &min, float &max)
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{
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assert (size <= 1 && "Storage::getMinMaxHeights, chunk size should be <= 1 cell");
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/// \todo investigate if min/max heights should be stored at load time in ESM::Land instead
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Ogre::Vector2 origin = center - Ogre::Vector2(size/2.f, size/2.f);
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assert(origin.x == (int) origin.x);
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assert(origin.y == (int) origin.y);
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int cellX = static_cast<int>(origin.x);
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int cellY = static_cast<int>(origin.y);
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const ESM::Land* land = getLand(cellX, cellY);
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if (!land || !(land->mDataTypes&ESM::Land::DATA_VHGT))
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return false;
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min = std::numeric_limits<float>::max();
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max = -std::numeric_limits<float>::max();
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for (int row=0; row<ESM::Land::LAND_SIZE; ++row)
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{
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for (int col=0; col<ESM::Land::LAND_SIZE; ++col)
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{
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float h = land->mLandData->mHeights[col*ESM::Land::LAND_SIZE+row];
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if (h > max)
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max = h;
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if (h < min)
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min = h;
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}
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}
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return true;
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}
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void Storage::fixNormal (Ogre::Vector3& normal, int cellX, int cellY, int col, int row)
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{
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while (col >= ESM::Land::LAND_SIZE-1)
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{
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++cellY;
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col -= ESM::Land::LAND_SIZE-1;
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}
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while (row >= ESM::Land::LAND_SIZE-1)
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{
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++cellX;
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row -= ESM::Land::LAND_SIZE-1;
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}
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while (col < 0)
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{
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--cellY;
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col += ESM::Land::LAND_SIZE-1;
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}
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while (row < 0)
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{
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--cellX;
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row += ESM::Land::LAND_SIZE-1;
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}
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ESM::Land* land = getLand(cellX, cellY);
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if (land && land->mDataTypes&ESM::Land::DATA_VNML)
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{
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normal.x = land->mLandData->mNormals[col*ESM::Land::LAND_SIZE*3+row*3];
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normal.y = land->mLandData->mNormals[col*ESM::Land::LAND_SIZE*3+row*3+1];
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normal.z = land->mLandData->mNormals[col*ESM::Land::LAND_SIZE*3+row*3+2];
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normal.normalise();
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}
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else
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normal = Ogre::Vector3(0,0,1);
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}
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void Storage::averageNormal(Ogre::Vector3 &normal, int cellX, int cellY, int col, int row)
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{
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Ogre::Vector3 n1,n2,n3,n4;
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fixNormal(n1, cellX, cellY, col+1, row);
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fixNormal(n2, cellX, cellY, col-1, row);
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fixNormal(n3, cellX, cellY, col, row+1);
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fixNormal(n4, cellX, cellY, col, row-1);
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normal = (n1+n2+n3+n4);
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normal.normalise();
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}
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void Storage::fixColour (Ogre::ColourValue& color, int cellX, int cellY, int col, int row)
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{
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if (col == ESM::Land::LAND_SIZE-1)
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{
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++cellY;
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col = 0;
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}
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if (row == ESM::Land::LAND_SIZE-1)
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{
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++cellX;
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row = 0;
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}
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ESM::Land* land = getLand(cellX, cellY);
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if (land && land->mDataTypes&ESM::Land::DATA_VCLR)
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{
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color.r = land->mLandData->mColours[col*ESM::Land::LAND_SIZE*3+row*3] / 255.f;
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color.g = land->mLandData->mColours[col*ESM::Land::LAND_SIZE*3+row*3+1] / 255.f;
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color.b = land->mLandData->mColours[col*ESM::Land::LAND_SIZE*3+row*3+2] / 255.f;
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}
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else
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{
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color.r = 1;
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color.g = 1;
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color.b = 1;
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}
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}
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void Storage::fillVertexBuffers (int lodLevel, float size, const Ogre::Vector2& center, Terrain::Alignment align,
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std::vector<float>& positions,
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std::vector<float>& normals,
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std::vector<Ogre::uint8>& colours)
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{
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// LOD level n means every 2^n-th vertex is kept
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size_t increment = 1 << lodLevel;
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Ogre::Vector2 origin = center - Ogre::Vector2(size/2.f, size/2.f);
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assert(origin.x == (int) origin.x);
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assert(origin.y == (int) origin.y);
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int startX = static_cast<int>(origin.x);
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int startY = static_cast<int>(origin.y);
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size_t numVerts = static_cast<size_t>(size*(ESM::Land::LAND_SIZE - 1) / increment + 1);
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colours.resize(numVerts*numVerts*4);
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positions.resize(numVerts*numVerts*3);
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normals.resize(numVerts*numVerts*3);
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Ogre::Vector3 normal;
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Ogre::ColourValue color;
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float vertY = 0;
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float vertX = 0;
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float vertY_ = 0; // of current cell corner
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for (int cellY = startY; cellY < startY + std::ceil(size); ++cellY)
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{
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float vertX_ = 0; // of current cell corner
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for (int cellX = startX; cellX < startX + std::ceil(size); ++cellX)
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{
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ESM::Land* land = getLand(cellX, cellY);
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if (land && !(land->mDataTypes&ESM::Land::DATA_VHGT))
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land = NULL;
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int rowStart = 0;
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int colStart = 0;
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// Skip the first row / column unless we're at a chunk edge,
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// since this row / column is already contained in a previous cell
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if (colStart == 0 && vertY_ != 0)
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colStart += increment;
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if (rowStart == 0 && vertX_ != 0)
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rowStart += increment;
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vertY = vertY_;
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for (int col=colStart; col<ESM::Land::LAND_SIZE; col += increment)
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{
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vertX = vertX_;
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for (int row=rowStart; row<ESM::Land::LAND_SIZE; row += increment)
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{
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positions[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3)] = ((vertX / float(numVerts - 1) - 0.5f) * size * 8192);
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positions[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3 + 1)] = ((vertY / float(numVerts - 1) - 0.5f) * size * 8192);
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if (land)
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positions[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3 + 2)] = land->mLandData->mHeights[col*ESM::Land::LAND_SIZE + row];
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else
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positions[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3 + 2)] = -2048;
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if (land && land->mDataTypes&ESM::Land::DATA_VNML)
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{
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normal.x = land->mLandData->mNormals[col*ESM::Land::LAND_SIZE*3+row*3];
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normal.y = land->mLandData->mNormals[col*ESM::Land::LAND_SIZE*3+row*3+1];
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normal.z = land->mLandData->mNormals[col*ESM::Land::LAND_SIZE*3+row*3+2];
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normal.normalise();
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}
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else
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normal = Ogre::Vector3(0,0,1);
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// Normals apparently don't connect seamlessly between cells
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if (col == ESM::Land::LAND_SIZE-1 || row == ESM::Land::LAND_SIZE-1)
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fixNormal(normal, cellX, cellY, col, row);
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// some corner normals appear to be complete garbage (z < 0)
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if ((row == 0 || row == ESM::Land::LAND_SIZE-1) && (col == 0 || col == ESM::Land::LAND_SIZE-1))
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averageNormal(normal, cellX, cellY, col, row);
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assert(normal.z > 0);
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normals[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3)] = normal.x;
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normals[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3 + 1)] = normal.y;
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normals[static_cast<unsigned int>(vertX*numVerts * 3 + vertY * 3 + 2)] = normal.z;
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if (land && land->mDataTypes&ESM::Land::DATA_VCLR)
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{
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color.r = land->mLandData->mColours[col*ESM::Land::LAND_SIZE*3+row*3] / 255.f;
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color.g = land->mLandData->mColours[col*ESM::Land::LAND_SIZE*3+row*3+1] / 255.f;
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color.b = land->mLandData->mColours[col*ESM::Land::LAND_SIZE*3+row*3+2] / 255.f;
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}
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else
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{
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color.r = 1;
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color.g = 1;
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color.b = 1;
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}
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// Unlike normals, colors mostly connect seamlessly between cells, but not always...
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if (col == ESM::Land::LAND_SIZE-1 || row == ESM::Land::LAND_SIZE-1)
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fixColour(color, cellX, cellY, col, row);
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color.a = 1;
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Ogre::uint32 rsColor;
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Ogre::Root::getSingleton().getRenderSystem()->convertColourValue(color, &rsColor);
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memcpy(&colours[static_cast<unsigned int>(vertX*numVerts * 4 + vertY * 4)], &rsColor, sizeof(Ogre::uint32));
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++vertX;
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}
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++vertY;
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}
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vertX_ = vertX;
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}
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vertY_ = vertY;
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assert(vertX_ == numVerts); // Ensure we covered whole area
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}
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assert(vertY_ == numVerts); // Ensure we covered whole area
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}
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Storage::UniqueTextureId Storage::getVtexIndexAt(int cellX, int cellY,
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int x, int y)
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{
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// For the first/last row/column, we need to get the texture from the neighbour cell
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// to get consistent blending at the borders
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--x;
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if (x < 0)
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{
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--cellX;
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x += ESM::Land::LAND_TEXTURE_SIZE;
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}
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if (y >= ESM::Land::LAND_TEXTURE_SIZE) // Y appears to be wrapped from the other side because why the hell not?
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{
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++cellY;
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y -= ESM::Land::LAND_TEXTURE_SIZE;
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}
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assert(x<ESM::Land::LAND_TEXTURE_SIZE);
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assert(y<ESM::Land::LAND_TEXTURE_SIZE);
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ESM::Land* land = getLand(cellX, cellY);
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if (land && (land->mDataTypes&ESM::Land::DATA_VTEX))
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{
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int tex = land->mLandData->mTextures[y * ESM::Land::LAND_TEXTURE_SIZE + x];
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if (tex == 0)
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return std::make_pair(0,0); // vtex 0 is always the base texture, regardless of plugin
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return std::make_pair(tex, land->mPlugin);
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}
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else
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return std::make_pair(0,0);
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}
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std::string Storage::getTextureName(UniqueTextureId id)
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{
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if (id.first == 0)
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return "textures\\_land_default.dds"; // Not sure if the default texture really is hardcoded?
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// NB: All vtex ids are +1 compared to the ltex ids
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const ESM::LandTexture* ltex = getLandTexture(id.first-1, id.second);
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//TODO this is needed due to MWs messed up texture handling
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std::string texture = Misc::ResourceHelpers::correctTexturePath(ltex->mTexture);
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return texture;
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}
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void Storage::getBlendmaps (const std::vector<Terrain::QuadTreeNode*>& nodes, std::vector<Terrain::LayerCollection>& out, bool pack)
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{
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for (std::vector<Terrain::QuadTreeNode*>::const_iterator it = nodes.begin(); it != nodes.end(); ++it)
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{
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out.push_back(Terrain::LayerCollection());
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out.back().mTarget = *it;
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getBlendmapsImpl(static_cast<float>((*it)->getSize()), (*it)->getCenter(), pack, out.back().mBlendmaps, out.back().mLayers);
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}
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}
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void Storage::getBlendmaps(float chunkSize, const Ogre::Vector2 &chunkCenter,
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bool pack, std::vector<Ogre::PixelBox> &blendmaps, std::vector<Terrain::LayerInfo> &layerList)
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{
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getBlendmapsImpl(chunkSize, chunkCenter, pack, blendmaps, layerList);
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}
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void Storage::getBlendmapsImpl(float chunkSize, const Ogre::Vector2 &chunkCenter,
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bool pack, std::vector<Ogre::PixelBox> &blendmaps, std::vector<Terrain::LayerInfo> &layerList)
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{
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// TODO - blending isn't completely right yet; the blending radius appears to be
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// different at a cell transition (2 vertices, not 4), so we may need to create a larger blendmap
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// and interpolate the rest of the cell by hand? :/
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Ogre::Vector2 origin = chunkCenter - Ogre::Vector2(chunkSize/2.f, chunkSize/2.f);
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int cellX = static_cast<int>(origin.x);
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int cellY = static_cast<int>(origin.y);
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// Save the used texture indices so we know the total number of textures
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// and number of required blend maps
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std::set<UniqueTextureId> textureIndices;
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// Due to the way the blending works, the base layer will always shine through in between
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// blend transitions (eg halfway between two texels, both blend values will be 0.5, so 25% of base layer visible).
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// To get a consistent look, we need to make sure to use the same base layer in all cells.
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// So we're always adding _land_default.dds as the base layer here, even if it's not referenced in this cell.
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textureIndices.insert(std::make_pair(0,0));
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for (int y=0; y<ESM::Land::LAND_TEXTURE_SIZE+1; ++y)
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for (int x=0; x<ESM::Land::LAND_TEXTURE_SIZE+1; ++x)
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{
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UniqueTextureId id = getVtexIndexAt(cellX, cellY, x, y);
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textureIndices.insert(id);
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}
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// Makes sure the indices are sorted, or rather,
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// retrieved as sorted. This is important to keep the splatting order
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// consistent across cells.
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std::map<UniqueTextureId, int> textureIndicesMap;
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for (std::set<UniqueTextureId>::iterator it = textureIndices.begin(); it != textureIndices.end(); ++it)
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{
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int size = textureIndicesMap.size();
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textureIndicesMap[*it] = size;
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layerList.push_back(getLayerInfo(getTextureName(*it)));
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}
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int numTextures = textureIndices.size();
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// numTextures-1 since the base layer doesn't need blending
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int numBlendmaps = pack ? static_cast<int>(std::ceil((numTextures - 1) / 4.f)) : (numTextures - 1);
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int channels = pack ? 4 : 1;
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// Second iteration - create and fill in the blend maps
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const int blendmapSize = ESM::Land::LAND_TEXTURE_SIZE+1;
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for (int i=0; i<numBlendmaps; ++i)
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{
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Ogre::PixelFormat format = pack ? Ogre::PF_A8B8G8R8 : Ogre::PF_A8;
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Ogre::uchar* pData =
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OGRE_ALLOC_T(Ogre::uchar, blendmapSize*blendmapSize*channels, Ogre::MEMCATEGORY_GENERAL);
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memset(pData, 0, blendmapSize*blendmapSize*channels);
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for (int y=0; y<blendmapSize; ++y)
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{
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for (int x=0; x<blendmapSize; ++x)
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{
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UniqueTextureId id = getVtexIndexAt(cellX, cellY, x, y);
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int layerIndex = textureIndicesMap.find(id)->second;
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int blendIndex = (pack ? static_cast<int>(std::floor((layerIndex - 1) / 4.f)) : layerIndex - 1);
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int channel = pack ? std::max(0, (layerIndex-1) % 4) : 0;
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if (blendIndex == i)
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pData[y*blendmapSize*channels + x*channels + channel] = 255;
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else
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pData[y*blendmapSize*channels + x*channels + channel] = 0;
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}
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}
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blendmaps.push_back(Ogre::PixelBox(blendmapSize, blendmapSize, 1, format, pData));
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}
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}
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float Storage::getHeightAt(const Ogre::Vector3 &worldPos)
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{
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int cellX = static_cast<int>(std::floor(worldPos.x / 8192.f));
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int cellY = static_cast<int>(std::floor(worldPos.y / 8192.f));
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ESM::Land* land = getLand(cellX, cellY);
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if (!land || !(land->mDataTypes&ESM::Land::DATA_VHGT))
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return -2048;
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// Mostly lifted from Ogre::Terrain::getHeightAtTerrainPosition
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// Normalized position in the cell
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float nX = (worldPos.x - (cellX * 8192))/8192.f;
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float nY = (worldPos.y - (cellY * 8192))/8192.f;
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// get left / bottom points (rounded down)
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float factor = ESM::Land::LAND_SIZE - 1.0f;
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float invFactor = 1.0f / factor;
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int startX = static_cast<int>(nX * factor);
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int startY = static_cast<int>(nY * factor);
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int endX = startX + 1;
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int endY = startY + 1;
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endX = std::min(endX, ESM::Land::LAND_SIZE-1);
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endY = std::min(endY, ESM::Land::LAND_SIZE-1);
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// now get points in terrain space (effectively rounding them to boundaries)
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float startXTS = startX * invFactor;
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float startYTS = startY * invFactor;
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float endXTS = endX * invFactor;
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float endYTS = endY * invFactor;
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// get parametric from start coord to next point
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float xParam = (nX - startXTS) * factor;
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float yParam = (nY - startYTS) * factor;
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/* For even / odd tri strip rows, triangles are this shape:
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even odd
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3---2 3---2
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| / | | \ |
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0---1 0---1
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*/
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// Build all 4 positions in normalized cell space, using point-sampled height
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Ogre::Vector3 v0 (startXTS, startYTS, getVertexHeight(land, startX, startY) / 8192.f);
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Ogre::Vector3 v1 (endXTS, startYTS, getVertexHeight(land, endX, startY) / 8192.f);
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Ogre::Vector3 v2 (endXTS, endYTS, getVertexHeight(land, endX, endY) / 8192.f);
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Ogre::Vector3 v3 (startXTS, endYTS, getVertexHeight(land, startX, endY) / 8192.f);
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// define this plane in terrain space
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Ogre::Plane plane;
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// (At the moment, all rows have the same triangle alignment)
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if (true)
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{
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// odd row
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bool secondTri = ((1.0 - yParam) > xParam);
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if (secondTri)
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plane.redefine(v0, v1, v3);
|
|
else
|
|
plane.redefine(v1, v2, v3);
|
|
}
|
|
else
|
|
{
|
|
// even row
|
|
bool secondTri = (yParam > xParam);
|
|
if (secondTri)
|
|
plane.redefine(v0, v2, v3);
|
|
else
|
|
plane.redefine(v0, v1, v2);
|
|
}
|
|
|
|
// Solve plane equation for z
|
|
return (-plane.normal.x * nX
|
|
-plane.normal.y * nY
|
|
- plane.d) / plane.normal.z * 8192;
|
|
|
|
}
|
|
|
|
float Storage::getVertexHeight(const ESM::Land *land, int x, int y)
|
|
{
|
|
assert(x < ESM::Land::LAND_SIZE);
|
|
assert(y < ESM::Land::LAND_SIZE);
|
|
return land->mLandData->mHeights[y * ESM::Land::LAND_SIZE + x];
|
|
}
|
|
|
|
Terrain::LayerInfo Storage::getLayerInfo(const std::string& texture)
|
|
{
|
|
// Already have this cached?
|
|
std::map<std::string, Terrain::LayerInfo>::iterator found = mLayerInfoMap.find(texture);
|
|
if (found != mLayerInfoMap.end())
|
|
return found->second;
|
|
|
|
Terrain::LayerInfo info;
|
|
info.mParallax = false;
|
|
info.mSpecular = false;
|
|
info.mDiffuseMap = texture;
|
|
std::string texture_ = texture;
|
|
boost::replace_last(texture_, ".", "_nh.");
|
|
|
|
if (Ogre::ResourceGroupManager::getSingleton().resourceExistsInAnyGroup(texture_))
|
|
{
|
|
info.mNormalMap = texture_;
|
|
info.mParallax = true;
|
|
}
|
|
else
|
|
{
|
|
texture_ = texture;
|
|
boost::replace_last(texture_, ".", "_n.");
|
|
if (Ogre::ResourceGroupManager::getSingleton().resourceExistsInAnyGroup(texture_))
|
|
info.mNormalMap = texture_;
|
|
}
|
|
|
|
texture_ = texture;
|
|
boost::replace_last(texture_, ".", "_diffusespec.");
|
|
if (Ogre::ResourceGroupManager::getSingleton().resourceExistsInAnyGroup(texture_))
|
|
{
|
|
info.mDiffuseMap = texture_;
|
|
info.mSpecular = true;
|
|
}
|
|
|
|
// This wasn't cached, so the textures are probably not loaded either.
|
|
// Background load them so they are hopefully already loaded once we need them!
|
|
Ogre::ResourceBackgroundQueue::getSingleton().load("Texture", info.mDiffuseMap, "General");
|
|
if (!info.mNormalMap.empty())
|
|
Ogre::ResourceBackgroundQueue::getSingleton().load("Texture", info.mNormalMap, "General");
|
|
|
|
mLayerInfoMap[texture] = info;
|
|
|
|
return info;
|
|
}
|
|
|
|
Terrain::LayerInfo Storage::getDefaultLayer()
|
|
{
|
|
Terrain::LayerInfo info;
|
|
info.mDiffuseMap = "textures\\_land_default.dds";
|
|
info.mParallax = false;
|
|
info.mSpecular = false;
|
|
return info;
|
|
}
|
|
|
|
float Storage::getCellWorldSize()
|
|
{
|
|
return static_cast<float>(ESM::Land::REAL_SIZE);
|
|
}
|
|
|
|
int Storage::getCellVertices()
|
|
{
|
|
return ESM::Land::LAND_SIZE;
|
|
}
|
|
|
|
}
|