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

ogl.cpp

@@ -0,0 +1,107 @@
+/*************************************************************************************
+ * Copyright (c) 2016, Miguel Angel Astor Romero                                     *
+ * All rights reserved.                                                              *
+ *                                                                                   *
+ * Redistribution and use in source and binary forms, with or without                *
+ * modification, are permitted provided that the following conditions are met:       *
+ *                                                                                   *
+ * 1. Redistributions of source code must retain the above copyright notice, this    *
+ *    list of conditions and the following disclaimer.                               *
+ * 2. 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.                         *
+ *                                                                                   *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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 <iostream>
+#include <GL/glew.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <pnglite.h>
+
+#include "ogl.hpp"
+#include "GLSLProgram.hpp"
+
+#define BUFFER_OFFSET(i) ((char *)NULL + (i))
+
+namespace ogl
+{ 
+  // Variables
+  static CGLSLProgram m_program;
+  static PheromoneMap * m_phero_map = NULL;
+  static GLuint m_textureHandle;
+
+  // Quad definition
+  static glm::vec4 vec_points[6];
+  static glm::vec2 vec_tex_coords[6];
+  
+  static void quad() {
+    vec_tex_coords[0] = glm::vec2( 0.0f,  0.0f); vec_points[0] = glm::vec4( -0.5f, -0.5f, 0.0f, 1.0f );
+    vec_tex_coords[1] = glm::vec2( 0.0f,  1.0f); vec_points[1] = glm::vec4( -0.5f,  0.5f, 0.0f, 1.0f );
+    vec_tex_coords[2] = glm::vec2( 1.0f,  0.0f); vec_points[2] = glm::vec4(  0.5f, -0.5f, 0.0f, 1.0f );
+    vec_tex_coords[3] = glm::vec2( 1.0f,  0.0f); vec_points[3] = glm::vec4(  0.5f, -0.5f, 0.0f, 1.0f );
+    vec_tex_coords[4] = glm::vec2( 0.0f,  1.0f); vec_points[4] = glm::vec4( -0.5f,  0.5f, 0.0f, 1.0f );
+    vec_tex_coords[5] = glm::vec2( 1.0f,  1.0f); vec_points[5] = glm::vec4(  0.5f,  0.5f, 0.0f, 1.0f );
+  }
+
+  void initialize(PheromoneMap * phero_map) {
+    glewInit();
+
+    quad();
+    m_phero_map = phero_map;
+    
+    m_program.loadShader("shaders/basic.vert", CGLSLProgram::VERTEX);
+    m_program.loadShader("shaders/basic.frag", CGLSLProgram::FRAGMENT);
+    m_program.create_link();
+    m_program.enable();
+    m_program.addUniform("sTexture");
+    m_program.disable();
+
+    std::cout << "OpenGL Version: " << (char*)glGetString(GL_VERSION) << std::endl;
+    std::cout << "OpenGL Vendor: " << (char*)glGetString(GL_VENDOR) << std::endl;
+  }
+
+  void display() {
+    glClear(GL_COLOR_BUFFER_BIT);
+    glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
+
+    if(m_phero_map != NULL)
+      m_textureHandle = m_phero_map->s_build_texture(); // Good grief!
+    
+    m_program.enable();
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, m_textureHandle);
+    glUniform1i(m_program.getLocation("sTexture"), 0);
+
+    glBegin(GL_TRIANGLES); {
+      for(int i = 0; i < 6; i++) {
+	glTexCoord2f(vec_tex_coords[i].s, vec_tex_coords[i].t);
+	glVertex4f(vec_points[i].x, vec_points[i].y, vec_points[i].z, vec_points[i].w);
+      }
+    } glEnd();
+
+    m_program.disable();
+  }
+
+  void reshape(int w, int h) {
+    if(h == 0)
+      h = 1;
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluOrtho2D(-0.5, 0.5, -0.5, 0.5);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+  }
+}