130 lines
4.3 KiB
C++
130 lines
4.3 KiB
C++
/* SPDX-FileCopyrightText: 2011-2022 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup freestyle
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* \brief Class to define a cell grid surrounding the projected image of a scene
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*/
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#include "AverageAreaGridDensityProvider.h"
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#include "BLI_sys_types.h"
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#include "BKE_global.hh"
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namespace Freestyle {
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AverageAreaGridDensityProvider::AverageAreaGridDensityProvider(OccluderSource &source,
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const real proscenium[4],
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real sizeFactor)
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: GridDensityProvider(source)
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{
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initialize(proscenium, sizeFactor);
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}
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AverageAreaGridDensityProvider::AverageAreaGridDensityProvider(
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OccluderSource &source,
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const BBox<Vec3r> &bbox,
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const GridHelpers::Transform &transform,
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real sizeFactor)
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: GridDensityProvider(source)
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{
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real proscenium[4];
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calculateQuickProscenium(transform, bbox, proscenium);
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initialize(proscenium, sizeFactor);
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}
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AverageAreaGridDensityProvider::AverageAreaGridDensityProvider(OccluderSource &source,
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real sizeFactor)
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: GridDensityProvider(source)
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{
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real proscenium[4];
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calculateOptimalProscenium(source, proscenium);
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initialize(proscenium, sizeFactor);
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}
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void AverageAreaGridDensityProvider::initialize(const real proscenium[4], real sizeFactor)
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{
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float prosceniumWidth = (proscenium[1] - proscenium[0]);
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float prosceniumHeight = (proscenium[3] - proscenium[2]);
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real cellArea = 0.0;
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uint numFaces = 0;
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for (source.begin(); source.isValid(); source.next()) {
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Polygon3r &poly(source.getGridSpacePolygon());
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Vec3r min, max;
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poly.getBBox(min, max);
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cellArea += (max[0] - min[0]) * (max[1] - min[1]);
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++numFaces;
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}
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if (G.debug & G_DEBUG_FREESTYLE) {
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cout << "Total area: " << cellArea << ". Number of faces: " << numFaces << "." << endl;
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}
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cellArea /= numFaces;
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cellArea *= sizeFactor;
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if (G.debug & G_DEBUG_FREESTYLE) {
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cout << "Building grid with average area " << cellArea << endl;
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}
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_cellSize = sqrt(cellArea);
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uint maxCells = 931; // * 1.1 = 1024
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if (std::max(prosceniumWidth, prosceniumHeight) / _cellSize > maxCells) {
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if (G.debug & G_DEBUG_FREESTYLE) {
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cout << "Scene-dependent cell size (" << _cellSize << " square) is too small." << endl;
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}
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_cellSize = std::max(prosceniumWidth, prosceniumHeight) / maxCells;
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}
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// Now we know how many cells make each side of our grid
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_cellsX = ceil(prosceniumWidth / _cellSize);
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_cellsY = ceil(prosceniumHeight / _cellSize);
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if (G.debug & G_DEBUG_FREESTYLE) {
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cout << _cellsX << "x" << _cellsY << " cells of size " << _cellSize << " square." << endl;
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}
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// Make sure the grid exceeds the proscenium by a small amount
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float safetyZone = 0.1f;
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if (_cellsX * _cellSize < prosceniumWidth * (1.0 + safetyZone)) {
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_cellsX = ceil(prosceniumWidth * (1.0 + safetyZone) / _cellSize);
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}
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if (_cellsY * _cellSize < prosceniumHeight * (1.0 + safetyZone)) {
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_cellsY = ceil(prosceniumHeight * (1.0 + safetyZone) / _cellSize);
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}
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if (G.debug & G_DEBUG_FREESTYLE) {
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cout << _cellsX << "x" << _cellsY << " cells of size " << _cellSize << " square." << endl;
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}
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// Find grid origin
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_cellOrigin[0] = ((proscenium[0] + proscenium[1]) / 2.0) - (_cellsX / 2.0) * _cellSize;
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_cellOrigin[1] = ((proscenium[2] + proscenium[3]) / 2.0) - (_cellsY / 2.0) * _cellSize;
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}
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AverageAreaGridDensityProviderFactory::AverageAreaGridDensityProviderFactory(real sizeFactor)
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: sizeFactor(sizeFactor)
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{
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}
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AutoPtr<GridDensityProvider> AverageAreaGridDensityProviderFactory::newGridDensityProvider(
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OccluderSource &source, const real proscenium[4])
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{
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return AutoPtr<GridDensityProvider>(
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new AverageAreaGridDensityProvider(source, proscenium, sizeFactor));
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}
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AutoPtr<GridDensityProvider> AverageAreaGridDensityProviderFactory::newGridDensityProvider(
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OccluderSource &source, const BBox<Vec3r> &bbox, const GridHelpers::Transform &transform)
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{
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return AutoPtr<GridDensityProvider>(
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new AverageAreaGridDensityProvider(source, bbox, transform, sizeFactor));
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}
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AutoPtr<GridDensityProvider> AverageAreaGridDensityProviderFactory::newGridDensityProvider(
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OccluderSource &source)
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{
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return AutoPtr<GridDensityProvider>(new AverageAreaGridDensityProvider(source, sizeFactor));
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}
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} /* namespace Freestyle */
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