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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 <SDL.h>
#include <algorithm>
#include <cstdlib>
#include <cstring>
// windows specific inclusion of alloca
// all other platforms have alloca in stdlib.h
#ifndef alloca
#include <malloc.h>
#endif
#include <libtcod.hpp>
#include "main.hpp"
#include "util_ripples.hpp"
// dummy height indicating that a cell is not water
static constexpr auto NO_WATER = -1000.0f;
// how much wave energy is lost per second
static constexpr auto DAMPING_COEF = 1.3f;
// wave height below which the water is considered still
static constexpr auto ACTIVE_THRESHOLD = 0.02f;
// height on the triggering ripple
static constexpr auto RIPPLE_TRIGGER = 3.0f;
// how many times ripples are updated per second
static constexpr auto RIPPLE_FPS = 10;
RippleManager::RippleManager(const TCODMap& waterMap) : width{waterMap.getWidth()}, height{waterMap.getHeight()} {
std::vector<bool> visited(width * height);
// first time : compute water zones
zone.cumulatedElapsed = 0.0f;
zone.isActive = false;
zone.data = std::vector<float>(width * height);
for (int dy = 0; dy < height; ++dy) {
for (int dx = 0; dx < width; ++dx) {
const 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;
}
}
zone.oldData = zone.data;
}
void RippleManager::startRipple(int x, int y) {
// look for the water zone
if (!(0 <= x && x < width && 0 <= y && y < height)) return;
const int offset = x + y * width;
if (zone.data[offset] != NO_WATER) {
zone.data[offset] = -RIPPLE_TRIGGER;
zone.isActive = true;
}
}
bool RippleManager::updateRipples(float elapsed) {
zone.cumulatedElapsed += elapsed;
if (zone.isActive && zone.cumulatedElapsed > 1.0f / RIPPLE_FPS) {
zone.isActive = false;
// update the ripples
zone.cumulatedElapsed = 0.0f;
// swap grids
std::swap(zone.data, zone.oldData);
for (int zy2 = 1; zy2 < height - 1; ++zy2) {
for (int zx2 = 1; zx2 < width - 1; ++zx2) {
const int offset = zx2 + zy2 * width;
if (zone.data[offset] != NO_WATER) {
float sum = 0.0f;
int count = 0;
// wave smoothing + spreading
if (zone.oldData[offset - 1] != NO_WATER) {
sum += zone.oldData[offset - 1];
++count;
}
if (zone.oldData[offset + 1] != NO_WATER) {
sum += zone.oldData[offset + 1];
++count;
}
if (zone.oldData[offset - width] != NO_WATER) {
sum += zone.oldData[offset - width];
++count;
}
if (zone.oldData[offset + width] != NO_WATER) {
sum += zone.oldData[offset + width];
++count;
}
sum = sum * 2 / count;
zone.data[offset] = sum - zone.data[offset];
// damping
zone.data[offset] *= 1.0f - DAMPING_COEF / RIPPLE_FPS;
if (std::abs(zone.data[offset]) > ACTIVE_THRESHOLD) {
zone.isActive = true;
}
}
}
}
}
return zone.isActive;
}
void RippleManager::renderRipples(const TCODImage& ground, TCODImage& groundWithRipples) {
const float elCoef = SDL_GetTicks() / 1000.0f * 2.0f;
for (int y = 1; y < height - 1; ++y) {
for (int x = 1; x < width - 1; ++x) {
if (getData(x, y) != NO_WATER) {
float xOffset = (getData(x - 1, y) - getData(x + 1, y));
const float yOffset = (getData(x, y - 1) - getData(x, y + 1));
const float f[3] = {static_cast<float>(x), static_cast<float>(y), elCoef};
xOffset += noise3d.get(f, TCOD_NOISE_SIMPLEX) * 0.3f;
if (std::abs(xOffset) < 250 && std::abs(yOffset) < 250) {
TCODColor col = ground.getPixel(x + static_cast<int>(xOffset), y + static_cast<int>(yOffset));
col = col + TCODColor{255, 255, 255} * xOffset * 0.1f;
groundWithRipples.putPixel(x, y, col);
}
}
}
}
}
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