OpenGL gui working. Added sketch of the pheromone map. Added shaders.

pheromone.cpp

@@ -0,0 +1,59 @@
+#include <iostream>
+#include <cstdlib>
+#include <pnglite.h>
+
+#include "pheromone.hpp"
+
+PheromoneMap::PheromoneMap(const char * file_name) {
+  load_map(file_name);
+  sem_init(&map_semaphore, 0, 1);
+  tex_created = false;
+}
+
+PheromoneMap::~PheromoneMap() {
+  free(data);
+  sem_destroy(&map_semaphore);
+
+  if(tex_created) {
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, handle);
+    glDeleteTextures(1, &handle);
+  }
+}
+
+void PheromoneMap::load_map(const char * file_name) {
+  png_t tex;
+
+  png_init(0, 0);
+  png_open_file_read(&tex, file_name);
+  data = (unsigned char*) malloc(tex.width * tex.height * tex.bpp);
+  png_get_data(&tex, data);
+
+  std::cout << "Loaded map \"" << file_name << "\" :: " << tex.width << "x" << tex.height << "x" << (int)tex.bpp << std::endl;
+  m_width  = tex.width;
+  m_height = tex.height;
+  m_bpp    = tex.bpp;
+  
+  png_close_file(&tex);
+}
+
+GLuint PheromoneMap::s_build_texture() {
+  sem_wait(&map_semaphore); {
+    if(tex_created) {
+      glActiveTexture(GL_TEXTURE0);
+      glBindTexture(GL_TEXTURE_2D, handle);
+      glDeleteTextures(1, &handle);
+    }
+    
+    glGenTextures(1, &handle);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, handle);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_width, m_height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    tex_created = true;
+  } sem_post(&map_semaphore);
+
+  return handle;
+}