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https://github.com/OpenMW/openmw.git
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631 lines
23 KiB
C++
631 lines
23 KiB
C++
#include "storage.hpp"
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#include <algorithm>
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#include <optional>
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#include <stdexcept>
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#include <osg/Image>
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#include <osg/Plane>
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#include <components/debug/debuglog.hpp>
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#include <components/esm/esmterrain.hpp>
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#include <components/esm/util.hpp>
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#include <components/esm3/loadland.hpp>
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#include <components/esm4/loadland.hpp>
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#include <components/misc/resourcehelpers.hpp>
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#include <components/misc/strings/algorithm.hpp>
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#include <components/vfs/manager.hpp>
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#include "gridsampling.hpp"
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namespace ESMTerrain
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{
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namespace
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{
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UniqueTextureId getTextureIdAt(const LandObject* land, std::size_t x, std::size_t y)
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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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if (land == nullptr)
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return { 0, 0 };
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const ESM::LandData* data = land->getData(ESM::Land::DATA_VTEX);
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if (data == nullptr)
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return { 0, 0 };
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const std::uint16_t tex = data->getTextures()[y * ESM::Land::LAND_TEXTURE_SIZE + x];
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if (tex == 0)
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return { 0, 0 }; // vtex 0 is always the base texture, regardless of plugin
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return { tex, land->getPlugin() };
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}
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}
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class LandCache
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{
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public:
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explicit LandCache(int offsetX, int offsetY, std::size_t size)
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: mOffsetX(offsetX)
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, mOffsetY(offsetY)
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, mSize(size)
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, mValues(size * size)
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{
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}
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std::optional<const LandObject*> find(int x, int y) const
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{
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const std::size_t index = getIndex(x, y);
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if (const auto& value = mValues[index])
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return value->get();
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return std::nullopt;
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}
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void insert(int x, int y, osg::ref_ptr<const LandObject>&& value)
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{
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const std::size_t index = getIndex(x, y);
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mValues[index] = std::move(value);
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}
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private:
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int mOffsetX;
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int mOffsetY;
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std::size_t mSize;
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std::vector<std::optional<osg::ref_ptr<const LandObject>>> mValues;
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std::size_t getIndex(int x, int y) const
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{
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return normalizeCoordinate(x, mOffsetX) * mSize + normalizeCoordinate(y, mOffsetY);
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}
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std::size_t normalizeCoordinate(int value, int offset) const
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{
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assert(value >= offset);
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assert(value < offset + static_cast<int>(mSize));
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return static_cast<std::size_t>(value - offset);
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}
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};
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LandObject::LandObject(const ESM4::Land& land, int loadFlags)
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: mData(land, loadFlags)
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{
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}
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LandObject::LandObject(const ESM::Land& land, int loadFlags)
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: mData(land, loadFlags)
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{
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}
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LandObject::LandObject(const LandObject& /*copy*/, const osg::CopyOp& /*copyOp*/)
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{
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throw std::logic_error("LandObject copy constructor is not implemented");
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}
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const float defaultHeight = ESM::Land::DEFAULT_HEIGHT;
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Storage::Storage(const VFS::Manager* vfs, std::string_view normalMapPattern,
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std::string_view normalHeightMapPattern, bool autoUseNormalMaps, std::string_view specularMapPattern,
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bool autoUseSpecularMaps)
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: mVFS(vfs)
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, mNormalMapPattern(normalMapPattern)
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, mNormalHeightMapPattern(normalHeightMapPattern)
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, mAutoUseNormalMaps(autoUseNormalMaps)
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, mSpecularMapPattern(specularMapPattern)
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, mAutoUseSpecularMaps(autoUseSpecularMaps)
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{
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}
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bool Storage::getMinMaxHeights(float size, const osg::Vec2f& center, ESM::RefId worldspace, 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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osg::Vec2f origin = center - osg::Vec2f(size / 2.f, size / 2.f);
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int cellX = static_cast<int>(std::floor(origin.x()));
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int cellY = static_cast<int>(std::floor(origin.y()));
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osg::ref_ptr<const LandObject> land = getLand(ESM::ExteriorCellLocation(cellX, cellY, worldspace));
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const ESM::LandData* data = land ? land->getData(ESM::Land::DATA_VHGT) : nullptr;
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const int landSize = ESM::getLandSize(worldspace);
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int startRow = (origin.x() - cellX) * landSize;
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int startColumn = (origin.y() - cellY) * landSize;
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int endRow = startRow + size * (landSize - 1) + 1;
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int endColumn = startColumn + size * (landSize - 1) + 1;
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if (data)
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{
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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 = startRow; row < endRow; ++row)
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{
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for (int col = startColumn; col < endColumn; ++col)
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{
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float h = data->getHeights()[col * landSize + 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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min = defaultHeight;
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max = defaultHeight;
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return false;
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}
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void Storage::fixNormal(
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osg::Vec3f& normal, ESM::ExteriorCellLocation cellLocation, int col, int row, LandCache& cache)
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{
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const int landSize = ESM::getLandSize(cellLocation.mWorldspace);
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while (col >= landSize - 1)
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{
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++cellLocation.mY;
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col -= landSize - 1;
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}
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while (row >= landSize - 1)
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{
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++cellLocation.mX;
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row -= landSize - 1;
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}
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while (col < 0)
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{
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--cellLocation.mY;
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col += landSize - 1;
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}
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while (row < 0)
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{
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--cellLocation.mX;
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row += landSize - 1;
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}
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const LandObject* land = getLand(cellLocation, cache);
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const ESM::LandData* data = land ? land->getData(ESM::Land::DATA_VNML) : nullptr;
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if (data)
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{
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normal.x() = data->getNormals()[col * landSize * 3 + row * 3];
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normal.y() = data->getNormals()[col * landSize * 3 + row * 3 + 1];
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normal.z() = data->getNormals()[col * landSize * 3 + row * 3 + 2];
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normal.normalize();
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}
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else
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normal = osg::Vec3f(0, 0, 1);
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}
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void Storage::averageNormal(
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osg::Vec3f& normal, ESM::ExteriorCellLocation cellLocation, int col, int row, LandCache& cache)
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{
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osg::Vec3f n1, n2, n3, n4;
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fixNormal(n1, cellLocation, col + 1, row, cache);
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fixNormal(n2, cellLocation, col - 1, row, cache);
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fixNormal(n3, cellLocation, col, row + 1, cache);
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fixNormal(n4, cellLocation, col, row - 1, cache);
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normal = (n1 + n2 + n3 + n4);
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normal.normalize();
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}
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void Storage::fixColour(
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osg::Vec4ub& color, ESM::ExteriorCellLocation cellLocation, int col, int row, LandCache& cache)
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{
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const int landSize = ESM::getLandSize(cellLocation.mWorldspace);
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if (col == landSize - 1)
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{
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++cellLocation.mY;
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col = 0;
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}
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if (row == landSize - 1)
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{
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++cellLocation.mX;
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row = 0;
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}
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const LandObject* land = getLand(cellLocation, cache);
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const ESM::LandData* data = land ? land->getData(ESM::Land::DATA_VCLR) : nullptr;
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if (data)
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{
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color.r() = data->getColors()[col * landSize * 3 + row * 3];
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color.g() = data->getColors()[col * landSize * 3 + row * 3 + 1];
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color.b() = data->getColors()[col * landSize * 3 + row * 3 + 2];
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}
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else
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{
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color.r() = 255;
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color.g() = 255;
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color.b() = 255;
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}
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}
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void Storage::fillVertexBuffers(int lodLevel, float size, const osg::Vec2f& center, ESM::RefId worldspace,
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osg::Vec3Array& positions, osg::Vec3Array& normals, osg::Vec4ubArray& colours)
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{
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if (lodLevel < 0 || 63 < lodLevel)
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throw std::invalid_argument("Invalid terrain lod level: " + std::to_string(lodLevel));
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if (size <= 0)
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throw std::invalid_argument("Invalid terrain size: " + std::to_string(size));
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// LOD level n means every 2^n-th vertex is kept
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const std::size_t sampleSize = std::size_t{ 1 } << lodLevel;
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const std::size_t cellSize = static_cast<std::size_t>(ESM::getLandSize(worldspace));
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const std::size_t numVerts = static_cast<std::size_t>(size * (cellSize - 1) / sampleSize) + 1;
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positions.resize(numVerts * numVerts);
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normals.resize(numVerts * numVerts);
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colours.resize(numVerts * numVerts);
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const bool alteration = useAlteration();
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const int landSizeInUnits = ESM::getCellSize(worldspace);
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const osg::Vec2f origin = center - osg::Vec2f(size, size) * 0.5f;
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const int startCellX = static_cast<int>(std::floor(origin.x()));
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const int startCellY = static_cast<int>(std::floor(origin.y()));
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LandCache cache(startCellX - 1, startCellY - 1, static_cast<std::size_t>(std::ceil(size)) + 2);
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std::pair lastCell{ startCellX, startCellY };
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const LandObject* land = getLand(ESM::ExteriorCellLocation(startCellX, startCellY, worldspace), cache);
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const ESM::LandData* heightData = nullptr;
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const ESM::LandData* normalData = nullptr;
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const ESM::LandData* colourData = nullptr;
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bool validHeightDataExists = false;
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if (land != nullptr)
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{
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heightData = land->getData(ESM::Land::DATA_VHGT);
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normalData = land->getData(ESM::Land::DATA_VNML);
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colourData = land->getData(ESM::Land::DATA_VCLR);
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validHeightDataExists = true;
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}
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const auto handleSample = [&](std::size_t cellShiftX, std::size_t cellShiftY, std::size_t row, std::size_t col,
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std::size_t vertX, std::size_t vertY) {
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const int cellX = startCellX + cellShiftX;
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const int cellY = startCellY + cellShiftY;
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const std::pair cell{ cellX, cellY };
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const ESM::ExteriorCellLocation cellLocation(cellX, cellY, worldspace);
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if (lastCell != cell)
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{
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land = getLand(cellLocation, cache);
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heightData = nullptr;
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normalData = nullptr;
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colourData = nullptr;
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if (land != nullptr)
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{
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heightData = land->getData(ESM::Land::DATA_VHGT);
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normalData = land->getData(ESM::Land::DATA_VNML);
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colourData = land->getData(ESM::Land::DATA_VCLR);
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validHeightDataExists = true;
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}
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lastCell = cell;
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}
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float height = defaultHeight;
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if (heightData != nullptr)
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height = heightData->getHeights()[col * cellSize + row];
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if (alteration)
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height += getAlteredHeight(col, row);
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const std::size_t vertIndex = vertX * numVerts + vertY;
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positions[vertIndex]
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= osg::Vec3f((vertX / static_cast<float>(numVerts - 1) - 0.5f) * size * landSizeInUnits,
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(vertY / static_cast<float>(numVerts - 1) - 0.5f) * size * landSizeInUnits, height);
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const std::size_t srcArrayIndex = col * cellSize * 3 + row * 3;
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osg::Vec3f normal(0, 0, 1);
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if (normalData != nullptr)
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{
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for (std::size_t i = 0; i < 3; ++i)
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normal[i] = normalData->getNormals()[srcArrayIndex + i];
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normal.normalize();
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}
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// Normals apparently don't connect seamlessly between cells
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if (col == cellSize - 1 || row == cellSize - 1)
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fixNormal(normal, cellLocation, col, row, cache);
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// some corner normals appear to be complete garbage (z < 0)
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if ((row == 0 || row == cellSize - 1) && (col == 0 || col == cellSize - 1))
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averageNormal(normal, cellLocation, col, row, cache);
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assert(normal.z() > 0);
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normals[vertIndex] = normal;
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osg::Vec4ub color(255, 255, 255, 255);
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if (colourData != nullptr)
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for (std::size_t i = 0; i < 3; ++i)
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color[i] = colourData->getColors()[srcArrayIndex + i];
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// Does nothing by default, override in OpenMW-CS
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if (alteration)
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adjustColor(col, row, heightData, color);
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// Unlike normals, colors mostly connect seamlessly between cells, but not always...
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if (col == cellSize - 1 || row == cellSize - 1)
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fixColour(color, cellLocation, col, row, cache);
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colours[vertIndex] = color;
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};
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const std::size_t beginX = static_cast<std::size_t>((origin.x() - startCellX) * cellSize);
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const std::size_t beginY = static_cast<std::size_t>((origin.y() - startCellY) * cellSize);
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const std::size_t distance = static_cast<std::size_t>(size * (cellSize - 1)) + 1;
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sampleCellGrid(cellSize, sampleSize, beginX, beginY, distance, handleSample);
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if (!validHeightDataExists && ESM::isEsm4Ext(worldspace))
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std::fill(positions.begin(), positions.end(), osg::Vec3f());
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}
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std::string Storage::getTextureName(UniqueTextureId id)
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{
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std::string_view texture = "_land_default.dds";
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if (id.first != 0)
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{
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// NB: All vtex ids are +1 compared to the ltex ids
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const std::string* ltex = getLandTexture(id.first - 1, id.second);
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if (ltex)
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texture = *ltex;
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else
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{
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Log(Debug::Warning) << "Warning: Unable to find land texture index " << id.first - 1 << " in plugin "
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<< id.second << ", using default texture instead";
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}
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}
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// this is needed due to MWs messed up texture handling
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return Misc::ResourceHelpers::correctTexturePath(texture, mVFS);
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}
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void Storage::getBlendmaps(float chunkSize, const osg::Vec2f& chunkCenter, ImageVector& blendmaps,
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std::vector<Terrain::LayerInfo>& layerList, ESM::RefId worldspace)
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{
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const osg::Vec2f origin = chunkCenter - osg::Vec2f(chunkSize, chunkSize) * 0.5f;
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const int startCellX = static_cast<int>(std::floor(origin.x()));
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const int startCellY = static_cast<int>(std::floor(origin.y()));
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const std::size_t blendmapSize = getBlendmapSize(chunkSize, ESM::Land::LAND_TEXTURE_SIZE);
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// We need to upscale the blendmap 2x with nearest neighbor sampling to look like Vanilla
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constexpr std::size_t imageScaleFactor = 2;
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const std::size_t blendmapImageSize = blendmapSize * imageScaleFactor;
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std::vector<UniqueTextureId> textureIds(blendmapSize * blendmapSize);
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LandCache cache(startCellX - 1, startCellY - 1, static_cast<std::size_t>(std::ceil(chunkSize)) + 2);
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std::pair lastCell{ startCellX, startCellY };
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const LandObject* land = getLand(ESM::ExteriorCellLocation(startCellX, startCellY, worldspace), cache);
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const auto handleSample = [&](const CellSample& sample) {
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const std::pair cell{ sample.mCellX, sample.mCellY };
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if (lastCell != cell)
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{
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land = getLand(ESM::ExteriorCellLocation(sample.mCellX, sample.mCellY, worldspace), cache);
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lastCell = cell;
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}
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textureIds[sample.mDstCol * blendmapSize + sample.mDstRow]
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= getTextureIdAt(land, sample.mSrcRow, sample.mSrcCol);
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};
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sampleBlendmaps(chunkSize, origin.x(), origin.y(), ESM::Land::LAND_TEXTURE_SIZE, handleSample);
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std::map<UniqueTextureId, std::size_t> textureIndicesMap;
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for (std::size_t y = 0; y < blendmapSize; ++y)
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{
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for (std::size_t x = 0; x < blendmapSize; ++x)
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{
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const UniqueTextureId id = textureIds[y * blendmapSize + x];
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auto found = textureIndicesMap.find(id);
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if (found == textureIndicesMap.end())
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{
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std::size_t layerIndex = layerList.size();
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Terrain::LayerInfo info = getLayerInfo(getTextureName(id));
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// look for existing diffuse map, which may be present when several plugins use the same texture
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for (std::size_t i = 0; i < layerList.size(); ++i)
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{
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if (layerList[i].mDiffuseMap == info.mDiffuseMap)
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{
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layerIndex = i;
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break;
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}
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}
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found = textureIndicesMap.emplace(id, layerIndex).first;
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if (layerIndex >= layerList.size())
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{
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osg::ref_ptr<osg::Image> image(new osg::Image);
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image->allocateImage(static_cast<int>(blendmapImageSize), static_cast<int>(blendmapImageSize),
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1, GL_ALPHA, GL_UNSIGNED_BYTE);
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std::memset(image->data(), 0, image->getTotalDataSize());
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blendmaps.push_back(std::move(image));
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layerList.push_back(std::move(info));
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}
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}
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const std::size_t layerIndex = found->second;
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unsigned char* const data = blendmaps[layerIndex]->data();
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const std::size_t realY = (blendmapSize - y - 1) * imageScaleFactor;
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const std::size_t realX = x * imageScaleFactor;
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data[((realY + 0) * blendmapImageSize + realX + 0)] = 255;
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data[((realY + 1) * blendmapImageSize + realX + 0)] = 255;
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data[((realY + 0) * blendmapImageSize + realX + 1)] = 255;
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data[((realY + 1) * blendmapImageSize + realX + 1)] = 255;
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}
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}
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if (blendmaps.size() == 1)
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blendmaps.clear(); // If a single texture fills the whole terrain, there is no need to blend
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}
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float Storage::getHeightAt(const osg::Vec3f& worldPos, ESM::RefId worldspace)
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{
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const float cellSize = ESM::getCellSize(worldspace);
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int cellX = static_cast<int>(std::floor(worldPos.x() / cellSize));
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int cellY = static_cast<int>(std::floor(worldPos.y() / cellSize));
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osg::ref_ptr<const LandObject> land = getLand(ESM::ExteriorCellLocation(cellX, cellY, worldspace));
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if (!land)
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return ESM::isEsm4Ext(worldspace) ? std::numeric_limits<float>::lowest() : defaultHeight;
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|
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const ESM::LandData* data = land->getData(ESM::Land::DATA_VHGT);
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if (!data)
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return defaultHeight;
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const int landSize = data->getLandSize();
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|
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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 * cellSize)) / cellSize;
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float nY = (worldPos.y() - (cellY * cellSize)) / cellSize;
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// get left / bottom points (rounded down)
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float factor = landSize - 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, landSize - 1);
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endY = std::min(endY, landSize - 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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|
|
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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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|
| / | | \ |
|
|
0---1 0---1
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|
*/
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|
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// Build all 4 positions in normalized cell space, using point-sampled height
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osg::Vec3f v0(startXTS, startYTS, getVertexHeight(data, startX, startY) / cellSize);
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osg::Vec3f v1(endXTS, startYTS, getVertexHeight(data, endX, startY) / cellSize);
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osg::Vec3f v2(endXTS, endYTS, getVertexHeight(data, endX, endY) / cellSize);
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|
osg::Vec3f v3(startXTS, endYTS, getVertexHeight(data, startX, endY) / cellSize);
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|
// define this plane in terrain space
|
|
osg::Plane plane;
|
|
// FIXME: deal with differing triangle alignment
|
|
if (true)
|
|
{
|
|
// odd row
|
|
bool secondTri = ((1.0 - yParam) > xParam);
|
|
if (secondTri)
|
|
plane = osg::Plane(v0, v1, v3);
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|
else
|
|
plane = osg::Plane(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.getNormal().x() * nX - plane.getNormal().y() * nY - plane[3]) / plane.getNormal().z() * cellSize;
|
|
}
|
|
|
|
const LandObject* Storage::getLand(ESM::ExteriorCellLocation cellLocation, LandCache& cache)
|
|
{
|
|
if (const auto land = cache.find(cellLocation.mX, cellLocation.mY))
|
|
return *land;
|
|
osg::ref_ptr<const LandObject> land = getLand(cellLocation);
|
|
const LandObject* result = land.get();
|
|
cache.insert(cellLocation.mX, cellLocation.mY, std::move(land));
|
|
return result;
|
|
}
|
|
|
|
void Storage::adjustColor(int col, int row, const ESM::LandData* heightData, osg::Vec4ub& color) const {}
|
|
|
|
float Storage::getAlteredHeight(int col, int row) const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
Terrain::LayerInfo Storage::getLayerInfo(const std::string& texture)
|
|
{
|
|
std::lock_guard<std::mutex> lock(mLayerInfoMutex);
|
|
|
|
// 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;
|
|
|
|
if (mAutoUseNormalMaps)
|
|
{
|
|
std::string texture_ = texture;
|
|
Misc::StringUtils::replaceLast(texture_, ".", mNormalHeightMapPattern + ".");
|
|
if (mVFS->exists(texture_))
|
|
{
|
|
info.mNormalMap = std::move(texture_);
|
|
info.mParallax = true;
|
|
}
|
|
else
|
|
{
|
|
texture_ = texture;
|
|
Misc::StringUtils::replaceLast(texture_, ".", mNormalMapPattern + ".");
|
|
if (mVFS->exists(texture_))
|
|
info.mNormalMap = std::move(texture_);
|
|
}
|
|
}
|
|
|
|
if (mAutoUseSpecularMaps)
|
|
{
|
|
std::string texture_ = texture;
|
|
Misc::StringUtils::replaceLast(texture_, ".", mSpecularMapPattern + ".");
|
|
if (mVFS->exists(texture_))
|
|
{
|
|
info.mDiffuseMap = std::move(texture_);
|
|
info.mSpecular = true;
|
|
}
|
|
}
|
|
|
|
mLayerInfoMap[texture] = info;
|
|
|
|
return info;
|
|
}
|
|
|
|
float Storage::getCellWorldSize(ESM::RefId worldspace)
|
|
{
|
|
return static_cast<float>(ESM::getCellSize(worldspace));
|
|
}
|
|
|
|
int Storage::getCellVertices(ESM::RefId worldspace)
|
|
{
|
|
return ESM::getLandSize(worldspace);
|
|
}
|
|
|
|
int Storage::getBlendmapScale(float chunkSize)
|
|
{
|
|
return ESM::Land::LAND_TEXTURE_SIZE * chunkSize;
|
|
}
|
|
|
|
}
|