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/*
* Photon reactor
* Copyright (c) 2011 Jice
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The names of Jice may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JICE ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL JICE BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <algorithm>
#include <libtcod.hpp>
#include "rad_shader.hpp"
PhotonShader::PhotonShader(float reflectivity, float selfIllumination, int nbPass)
: maxRadius_(0), reflectivity_(reflectivity), selfIllumination_(selfIllumination), nbPass_(nbPass) {}
int PhotonShader::addLight(int x, int y, int radius, const TCODColor& col) {
if (radius > maxRadius_) maxRadius_ = radius;
return Shader::addLight(x, y, radius, col);
}
void PhotonShader::init(TCODMap* map) {
Shader::init(map);
int size = map->getWidth() * map->getHeight();
int maxDiameter = 2 * maxRadius_ + 1;
// initialize data
ff_ = new float[size * maxDiameter * maxDiameter];
ffSum_ = new float[size];
data_ = new CellData[size];
memset(ff_, 0, sizeof(float) * size * maxDiameter * maxDiameter);
memset(data_, 0, sizeof(CellData) * size);
// compute form factors
for (int y = 0; y < map->getHeight(); y++) {
for (int x = 0; x < map->getWidth(); x++) {
computeFormFactor(x, y);
}
}
}
// compute form factor of cell x,y relative to all its surrounding cells
void PhotonShader::computeFormFactor(int x, int y) {
const int o_minx = x - maxRadius_;
const int o_miny = y - maxRadius_;
const int o_maxx = x + maxRadius_;
const int o_maxy = y + maxRadius_;
const int minx = std::max(o_minx, 0);
const int miny = std::max(o_miny, 0);
const int maxx = std::min(o_maxx, map_->getWidth() - 1);
const int maxy = std::min(o_maxy, map_->getHeight() - 1);
const int maxDiameter = 2 * maxRadius_ + 1;
float* cellFormFactor = ff_ + (x + y * map_->getWidth()) * maxDiameter * maxDiameter;
map_->computeFov(x, y, maxRadius_);
const int squareRad = (maxRadius_ * maxRadius_);
// float invRad=1.0/squareRad;
double curFfSum = 0;
const float offset = 1.0f / (1.0f + (float)(maxRadius_ * maxRadius_) / 20);
const float factor = 1.0f / (1.0f - offset);
for (int cx = minx, cdx = minx - o_minx; cx <= maxx; cx++, cdx++) {
for (int cy = miny, cdy = miny - o_miny; cy <= maxy; cy++, cdy++) {
if (map_->isInFov(cx, cy)) {
const int dist = (maxRadius_ - cdx) * (maxRadius_ - cdx) + (maxRadius_ - cdy) * (maxRadius_ - cdy);
if (dist <= squareRad) {
// float value = (1.0f-dist*invRad) ;
// float value =1.0f/(1.0f+(float)(dist)/20);
float value = (1.0f / (1.0f + (float)(dist) / 20) - offset) * factor;
curFfSum += value;
cellFormFactor[cdx + cdy * maxDiameter] = value;
}
}
}
}
// scale so that the sum of all form factors for cell x,y is 1.0
ffSum_[x + y * map_->getWidth()] = (float)curFfSum;
if (curFfSum > 1E-8) {
curFfSum = 1.0 / curFfSum;
for (int cx = minx, cdx = minx - o_minx; cx <= maxx; cx++, cdx++) {
for (int cy = miny, cdy = miny - o_miny; cy <= maxy; cy++, cdy++) {
cellFormFactor[cdx + cdy * maxDiameter] *= (float)curFfSum;
}
}
}
}
void PhotonShader::computeLightContribution(
int lx, int ly, int l_radius, const FColor& l_col, float /* reflectivity */) {
const int o_minx = lx - l_radius;
const int o_miny = ly - l_radius;
const int o_maxx = lx + l_radius;
const int o_maxy = ly + l_radius;
const int minx = std::max(o_minx, 0);
const int miny = std::max(o_miny, 0);
const int maxx = std::min(o_maxx, map_->getWidth() - 1);
const int maxy = std::min(o_maxy, map_->getHeight() - 1);
const int maxDiameter = 2 * maxRadius_ + 1;
const float* cellFormFactor = ff_ + (lx + ly * map_->getWidth()) * maxDiameter * maxDiameter;
// compute the light's contribution
static constexpr auto MIN_FACTOR = 1.0f / 255.0f;
const int width = map_->getWidth();
for (int y = miny, cdy = miny - o_miny; y <= maxy; y++, cdy++) {
CellData* cellData = &data_[minx + y * width];
const float* cellFormRow = &cellFormFactor[minx - o_minx + cdy * maxDiameter];
for (int x = minx; x <= maxx; x++, cellData++, cellFormRow++) {
const float cell_ff = *cellFormRow;
if (cell_ff > MIN_FACTOR) {
cellData->incoming.r += l_col.r * cell_ff;
cellData->incoming.g += l_col.g * cell_ff;
cellData->incoming.b += l_col.b * cell_ff;
}
}
}
}
void PhotonShader::propagate() {
CellData* cellData = data_;
const int size = map_->getWidth() * map_->getHeight();
lightsCoord_.clear();
for (int c = 0; c < size; c++, cellData++) {
cellData->emission.r = cellData->incoming.r * reflectivity_;
cellData->emission.g = cellData->incoming.g * reflectivity_;
cellData->emission.b = cellData->incoming.b * reflectivity_;
cellData->outgoing.r += cellData->incoming.r * selfIllumination_;
cellData->outgoing.g += cellData->incoming.g * selfIllumination_;
cellData->outgoing.b += cellData->incoming.b * selfIllumination_;
cellData->incoming.r = 0;
cellData->incoming.g = 0;
cellData->incoming.b = 0;
if (cellData->emission.r > 0 || cellData->emission.g > 0 || cellData->emission.b > 0)
lightsCoord_.emplace_back(c % map_->getWidth(), c / map_->getWidth());
}
}
void PhotonShader::compute() {
// turn off all lights
const int size = map_->getWidth() * map_->getHeight();
memset(data_, 0, sizeof(CellData) * size);
// first pass. lights only
for (const Light& l : lights_) {
const int off = l.x + l.y * map_->getWidth();
CellData* cellData = &data_[off];
const float sum = ffSum_[off];
cellData->emission.r = l.col.r * sum;
cellData->emission.g = l.col.r * sum;
cellData->emission.b = l.col.r * sum;
computeLightContribution(l.x, l.y, l.radius, cellData->emission, 0.5f);
}
// other passes. all lit cells act as lights
for (int pass = 1; pass < nbPass_; ++pass) {
propagate();
const CellData* cellData = data_;
// for (int y=0; y < map->getHeight(); y++ ) {
// for (int x=0; x < map->getWidth(); x++, cellData++ ) {
for (const Coord& c : lightsCoord_) {
cellData = &data_[c.x + c.y * map_->getWidth()];
computeLightContribution(c.x, c.y, maxRadius_, cellData->emission, reflectivity_);
}
}
const CellData* cellData = data_;
TCODColor* col = lightmap_;
propagate();
for (int c = 0; c < size; c++, cellData++, col++) {
col->r = static_cast<uint8_t>(std::min(255.0f, cellData->outgoing.r));
col->g = static_cast<uint8_t>(std::min(255.0f, cellData->outgoing.g));
col->b = static_cast<uint8_t>(std::min(255.0f, cellData->outgoing.b));
}
}
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