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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 <libtcod.h>
#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) {
int ominx = x - maxRadius;
int ominy = y - maxRadius;
int omaxx = x + maxRadius;
int omaxy = y + maxRadius;
int minx = MAX(ominx, 0);
int miny = MAX(ominy, 0);
int maxx = MIN(omaxx, map->getWidth() - 1);
int maxy = MIN(omaxy, map->getHeight() - 1);
int maxDiameter = 2 * maxRadius + 1;
float* cellFormFactor = ff + (x + y * map->getWidth()) * maxDiameter * maxDiameter;
map->computeFov(x, y, maxRadius);
int squareRad = (maxRadius * maxRadius);
// float invRad=1.0/squareRad;
double curFfSum = 0;
float offset = 1.0f / (1.0f + (float)(maxRadius * maxRadius) / 20);
float factor = 1.0f / (1.0f - offset);
for (int cx = minx, cdx = minx - ominx; cx <= maxx; cx++, cdx++) {
for (int cy = miny, cdy = miny - ominy; cy <= maxy; cy++, cdy++) {
if (map->isInFov(cx, cy)) {
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 - ominx; cx <= maxx; cx++, cdx++) {
for (int cy = miny, cdy = miny - ominy; cy <= maxy; cy++, cdy++) {
cellFormFactor[cdx + cdy * maxDiameter] *= (float)curFfSum;
}
}
}
}
void PhotonShader::computeLightContribution(int lx, int ly, int lradius, const FColor& lcol, float reflectivity) {
int ominx = lx - lradius;
int ominy = ly - lradius;
int omaxx = lx + lradius;
int omaxy = ly + lradius;
int minx = MAX(ominx, 0);
int miny = MAX(ominy, 0);
int maxx = MIN(omaxx, map->getWidth() - 1);
int maxy = MIN(omaxy, map->getHeight() - 1);
int maxDiameter = 2 * maxRadius + 1;
float* cellFormFactor = ff + (lx + ly * map->getWidth()) * maxDiameter * maxDiameter;
// compute the light's contribution
#define MIN_FACTOR (1.0f / 255.0f)
int width = map->getWidth();
for (int y = miny, cdy = miny - ominy; y <= maxy; y++, cdy++) {
CellData* cellData = &data[minx + y * width];
float* cellFormRow = &cellFormFactor[minx - ominx + cdy * maxDiameter];
for (int x = minx; x <= maxx; x++, cellData++, cellFormRow++) {
float cellff = *cellFormRow;
if (cellff > MIN_FACTOR) {
cellData->incoming.r += lcol.r * cellff;
cellData->incoming.g += lcol.g * cellff;
cellData->incoming.b += lcol.b * cellff;
}
}
}
}
void PhotonShader::propagate() {
CellData* cellData = data;
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
int size = map->getWidth() * map->getHeight();
memset(data, 0, sizeof(CellData) * size);
// first pass. lights only
for (const Light& l : lights) {
int off = l.x + l.y * map->getWidth();
CellData* cellData = &data[off];
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
int pass = 1;
while (pass < nbPass) {
propagate();
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);
}
pass++;
}
CellData* cellData = data;
TCODColor* col = lightmap;
propagate();
for (int c = 0; c < size; c++, cellData++, col++) {
col->r = (uint8_t)MIN(255, cellData->outgoing.r);
col->g = (uint8_t)MIN(255, cellData->outgoing.g);
col->b = (uint8_t)MIN(255, cellData->outgoing.b);
}
}
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