Added a simple photon map debug viewer.

PhotonViewer/.clang_complete

@@ -0,0 +1,7 @@
+-ansi
+-pedantic
+-std=c++11
+-g
+-Wall
+-DGLM_FORCE_RADIANS
+-I/usr/include/GL

PhotonViewer/Makefile

@@ -0,0 +1,16 @@
+TARGET = pviewer
+OBJECTS = main.o
+CXXFLAGS = -ansi -pedantic -std=c++11 -g -Wall -DGLM_FORCE_RADIANS -I/usr/include/GL
+LDLIBS = -lglut -lGLU -lGL
+
+.PHONY: all
+all: $(TARGET)
+
+$(TARGET): $(OBJECTS)
+	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDLIBS)
+
+main.o: main.cpp
+
+.PHONY: clean
+clean:
+	$(RM) $(TARGET) *.o

PhotonViewer/README.org

@@ -0,0 +1,5 @@
+* PhotonViewer
+
+This simple program takes as input one file with photon descriptions as generated by PhotonMF in debug mode
+and renders it naively using OpenGL. It works only as a debug tool for the photon mapping generation of
+PhotonMF.

PhotonViewer/main.cpp

@@ -0,0 +1,170 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <utility>
+#include <cstdio>
+#include <cstdlib>
+
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#include <OpenGL/glu.h>
+#include <GLUT/glut.h>
+#else
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#endif
+
+#include <glm/glm.hpp>
+
+using namespace std;
+
+static const char * APP_TITLE = "PhotonMF - Photon map viewer";
+
+// #define OUTPUT_REDIR
+#ifdef OUTPUT_REDIR
+static FILE * fout;
+static FILE * ferr;
+#endif
+
+static int w = 640;
+static int h = 480;
+static GLuint dlist;
+static vector<pair<glm::vec3, glm::vec3>> photons;
+
+void init_gl(void);
+void reshape(int _w, int _h);
+void keyboard(unsigned char key, int x, int y);
+void release_key(unsigned char key, int x, int y);
+void idle(void);
+void render_scene(void);
+void clean_up(void);
+
+void build_dlist() {
+  dlist = glGenLists(1);
+  glNewList(dlist, GL_COMPILE); {
+    glBegin(GL_POINTS); {
+      for (vector<pair<glm::vec3, glm::vec3>>::iterator it = photons.begin(); it != photons.end(); it++) {
+	glColor3f((*it).second.r, (*it).second.g, (*it).second.b);
+	glVertex3f((*it).first.x, (*it).first.y, (*it).first.z);
+      }
+    }
+    glEnd();
+  }
+  glEndList();
+}
+
+int main(int argc, char ** argv) {
+#ifdef OUTPUT_REDIR
+  fout = freopen("stdout.txt", "w", stdout);
+  ferr  = freopen("stderr.txt", "w", stderr);
+#endif
+
+  if (argc < 2) {
+    cerr << "USAGE: " << argv[0] << " FILE" << endl;
+    return EXIT_FAILURE;
+  }
+
+  ifstream ifs(argv[1], ios::in);
+
+  if (!ifs.is_open()) {
+    cerr << "Failed to open the file " << argv[1] << " for reading." << endl;
+    return EXIT_FAILURE;
+  }
+
+  while (!ifs.eof()) {
+    float x, y, z, r, g, b;
+    ifs >> x >> y >> z >> r >> g >> b;
+    photons.push_back(pair<glm::vec3, glm::vec3>(glm::vec3(x, y, z), glm::vec3(r, g, b)));
+  }
+
+  ifs.close();
+  
+  glutInit(&argc, argv);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
+  glutInitWindowPosition(10, 10);
+  glutInitWindowSize(w, h);
+  glutCreateWindow(APP_TITLE);
+  glutKeyboardFunc(keyboard);
+  glutIdleFunc(idle);
+  glutDisplayFunc(render_scene);
+  glutReshapeFunc(reshape);
+
+  atexit(clean_up);
+  init_gl();
+	
+  glutMainLoop();
+
+  return 0;
+}
+
+void init_gl(void) {
+  /* Enable back-face culling. */
+  glEnable(GL_CULL_FACE);
+  glCullFace(GL_BACK);
+
+  /* Enable lightning. */
+  glEnable(GL_LIGHTING);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_NORMALIZE);
+  glShadeModel(GL_SMOOTH);
+
+  /* Enable textures. */
+  glEnable(GL_TEXTURE_2D);
+
+  /* Enable Z-buffer. */
+  glEnable(GL_DEPTH_TEST);
+  glDepthMask(GL_TRUE);
+
+  /* Set OpenGL state. */
+  glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
+  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+
+  /* Hide the mouse pointer. */
+  glutSetCursor(GLUT_CURSOR_NONE);
+
+  build_dlist();
+}
+
+void reshape(int _w, int _h) {
+  w = _w;
+  h = _h;
+  /* Recalculate projection matrix. */
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  glViewport(0, 0, w, h);
+  gluPerspective(90, ((float)w)/(h > 0.0f ? ((float)h) : 1.0f), 0.1, 1000);
+  glTranslatef(0.0f, 0.0f, -1.0f);
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+  glutPostRedisplay();
+}
+
+void keyboard(unsigned char key, int x, int y) {
+  switch (key) {
+  case 27:
+    exit(0);
+    break;
+  }
+}
+
+void idle(void) {
+  glutPostRedisplay();
+}
+
+void render_scene(void) {
+  glClearColor(0.0, 0.0, 0.0, 1.0);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  glLoadIdentity();
+  glCallList(dlist);
+  glFlush();
+  glutSwapBuffers();
+}
+
+void clean_up(void) {
+  glDeleteLists(dlist, 1);
+#ifdef OUTPUT_REDIR
+  fclose(fout);
+  fclose(ferr);
+#endif
+}