103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
#include <iostream>
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#include <cstdlib>
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#include <pnglite.h>
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#include "pheromone.hpp"
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#define MAP_POS(X, Y) (data[((X) * m_height) + (Y)])
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static const float EVAPORATION_RATE = 0.1f;
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const unsigned char MAX_PHERO_INTENSITY = 250;
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const unsigned char MIN_PHERO_INTENSITY = 1;
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PheromoneMap::PheromoneMap(const char * file_name) {
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load_map(file_name);
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sem_init(&map_semaphore, 0, 1);
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tex_created = false;
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then = 0;
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}
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PheromoneMap::~PheromoneMap() {
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delete data;
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sem_destroy(&map_semaphore);
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if(tex_created) {
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, handle);
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glDeleteTextures(1, &handle);
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}
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}
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void PheromoneMap::load_map(const char * file_name) {
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png_t tex;
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png_init(0, 0);
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png_open_file_read(&tex, file_name);
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data = new unsigned char[tex.width * tex.height * tex.bpp];
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png_get_data(&tex, data);
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std::cout << "Loaded map \"" << file_name << "\" :: " << tex.width << "x" << tex.height << "x" << (int)tex.bpp << std::endl;
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m_width = tex.width;
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m_height = tex.height;
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m_bpp = tex.bpp;
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png_close_file(&tex);
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}
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GLuint PheromoneMap::s_build_texture() {
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sem_wait(&map_semaphore); {
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if(tex_created) {
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, handle);
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glDeleteTextures(1, &handle);
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}
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glGenTextures(1, &handle);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, handle);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, m_width, m_height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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tex_created = true;
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} sem_post(&map_semaphore);
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return handle;
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}
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bool PheromoneMap::s_deposit_pheromone(float x, float y) {
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bool valid = false;
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int _x = m_width * x;
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int _y = m_height - (m_height * y);
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sem_wait(&map_semaphore); {
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if(MAP_POS(_y, _x) <= MAX_PHERO_INTENSITY) {
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MAP_POS(_y, _x) = MAX_PHERO_INTENSITY;
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valid = true;
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}
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} sem_post(&map_semaphore);
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return valid;
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}
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void PheromoneMap::s_evaporate() {
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unsigned char p_eva;
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clock_t now = clock();
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if(static_cast<float>(now - then) / CLOCKS_PER_SEC < 0.05) {
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return;
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}
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then = now;
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sem_wait(&map_semaphore); {
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for(unsigned i = 1; i < m_height - 1; i++) {
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for(unsigned j = 1; j < m_width - 1; j++) {
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if(MAP_POS(i, j) >= MIN_PHERO_INTENSITY && MAP_POS(i, j) <= MAX_PHERO_INTENSITY){
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p_eva = MAP_POS(i, j) * EVAPORATION_RATE;
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MAP_POS(i, j) -= p_eva;
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}
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}
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}
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} sem_post(&map_semaphore);
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}
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