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/*
* Copyright (c) 2010 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 name 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 <stdlib.h>
#include <string.h>
// windows specific inclusion of alloca
// all other platforms have alloca in stdlib.h
#ifndef alloca
#include <malloc.h>
#endif
#include "main.hpp"
// dummy height indicating that a cell is not water
#define NO_WATER -1000.0f
// how much wave energy is lost per second
#define DAMPING_COEF 1.3f
// wave height below which the water is considered still
#define ACTIVE_THRESHOLD 0.02f
// height on the triggering ripple
#define RIPPLE_TRIGGER 3.0f
// how many times ripples are updated per second
#define RIPPLE_FPS 10
RippleManager::RippleManager(TCODMap* waterMap) { init(waterMap); }
void RippleManager::init(TCODMap* waterMap) {
this->width = waterMap->getWidth();
this->height = waterMap->getHeight();
bool* visited = (bool*)alloca(sizeof(bool) * width * height);
memset(visited, 0, sizeof(bool) * width * height);
// first time : compute water zones
zone.cumulatedElapsed = 0.0f;
zone.isActive = false;
zone.data = new float[width * height];
zone.oldData = new float[width * height];
for (int dx = 0; dx < width; dx++) {
for (int dy = 0; dy < height; dy++) {
float value = waterMap->isWalkable(dx, dy) ? 0.0f : NO_WATER;
// set water height to 0.0, not water cells to -1000
zone.data[dx + dy * width] = value;
}
}
memcpy(zone.oldData, zone.data, sizeof(float) * width * height);
}
void RippleManager::startRipple(int x, int y) {
// look for the water zone
int off = x + y * width;
if (zone.data[off] != NO_WATER) {
zone.data[off] = -RIPPLE_TRIGGER;
zone.isActive = true;
}
}
bool RippleManager::updateRipples(float elapsed) {
bool updated = false;
zone.cumulatedElapsed += elapsed;
if (zone.isActive) {
// update the ripples
if (zone.cumulatedElapsed > 1.0f / RIPPLE_FPS) {
zone.cumulatedElapsed = 0.0f;
// swap grids
float* tmp = zone.data;
zone.data = zone.oldData;
zone.oldData = tmp;
zone.isActive = false;
for (int zx2 = 1; zx2 < width - 1; zx2++) {
for (int zy2 = 1; zy2 < height - 1; zy2++) {
int off = zx2 + zy2 * width;
if (zone.data[off] != NO_WATER) {
float sum = 0.0f;
int count = 0;
// wave smoothing + spreading
if (zone.oldData[off - 1] != NO_WATER) {
sum += zone.oldData[off - 1];
count++;
}
if (zone.oldData[off + 1] != NO_WATER) {
sum += zone.oldData[off + 1];
count++;
}
if (zone.oldData[off - width] != NO_WATER) {
sum += zone.oldData[off - width];
count++;
}
if (zone.oldData[off + width] != NO_WATER) {
sum += zone.oldData[off + width];
count++;
}
sum = sum * 2 / count;
zone.data[off] = sum - zone.data[off];
// damping
zone.data[off] *= 1.0f - DAMPING_COEF / RIPPLE_FPS;
if (ABS(zone.data[off]) > ACTIVE_THRESHOLD) {
zone.isActive = true;
updated = true;
}
}
}
}
}
}
return updated;
}
void RippleManager::renderRipples(const TCODImage* ground, TCODImage* groundWithRipples) {
float elCoef = TCODSystem::getElapsedSeconds() * 2.0f;
for (int x = 1; x < width - 1; x++) {
for (int y = 1; y < height - 1; y++) {
if (getData(x, y) != NO_WATER) {
float xOffset = (getData(x - 1, y) - getData(x + 1, y));
float yOffset = (getData(x, y - 1) - getData(x, y + 1));
float f[3] = {float(x), float(y), elCoef};
xOffset += noise3d.get(f, TCOD_NOISE_SIMPLEX) * 0.3f;
if (ABS(xOffset) < 250 && ABS(yOffset) < 250) {
TCODColor col = ground->getPixel(x + (int)(xOffset), y + (int)(yOffset));
col = col + TCODColor::white * xOffset * 0.1f;
groundWithRipples->putPixel(x, y, col);
}
}
}
}
}
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