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[subsurface_scattering] / src / main.cpp
diff --git a/src/main.cpp b/src/main.cpp
index 1b59749c253f1e0faec5928359f855a74b9c5428..4f18e104f3e63e803f2584b47093776bfa807201 100644 (file)
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,214 +1,647 @@
 #include <stdio.h>\r
 #include <stdio.h>\r
+#include <fstream>\r
 \r
 #include <GL/glew.h>\r
 \r
 \r
 #include <GL/glew.h>\r
 \r
+#define GLM_ENABLE_EXPERIMENTAL\r
+\r
 #include <glm/glm.hpp>\r
 #include <glm/glm.hpp>\r
+#include <glm/gtx/rotate_vector.hpp>\r
 #include <glm/gtc/matrix_transform.hpp>\r
 #include <glm/gtc/type_ptr.hpp>\r
 \r
 #include <SFML/OpenGL.hpp>\r
 #include <glm/gtc/matrix_transform.hpp>\r
 #include <glm/gtc/type_ptr.hpp>\r
 \r
 #include <SFML/OpenGL.hpp>\r
-#include <SFML/Window.hpp>\r
+#include <SFML/Graphics.hpp>\r
+\r
+#include <imgui.h>\r
+#include <imgui-SFML.h>\r
 \r
 #include <assimp/Importer.hpp>\r
 \r
 #include <assimp/Importer.hpp>\r
-#include <assimp/scene.h>\r
 #include <assimp/postprocess.h>\r
 #include <assimp/postprocess.h>\r
+#include <assimp/scene.h>\r
 \r
 \r
 \r
 \r
-const char *vertexShaderSource =\r
-"#version 330 core\n"\r
-"layout (location = 0) in vec3 pos;\n"\r
-"uniform mat4 model;\n"\r
-"uniform mat4 view;\n"\r
-"uniform mat4 projection;\n"\r
-"\n"\r
-"void main()\n"\r
-"{\n"\r
-"    gl_Position = projection * view * model * vec4(pos, 1.0);\n"\r
-"}\n";\r
-\r
-const char *fragmentShaderSource =\r
-"#version 330 core\n"\r
-"out vec4 FragColor;\n"\r
-"\n"\r
-"void main()\n"\r
-"{\n"\r
-"    FragColor = vec4(1.0f, 1.0f, 1.0f, 1.0f);\n"\r
-"}\n";\r
-\r
-std::vector<float> vertices;\r
-std::vector<GLuint> indices;\r
-\r
-\r
-void load(const std::string &filename, std::vector<float> &vertices, std::vector<GLuint> &indices) {\r
-  Assimp::Importer importer;\r
+// sample positions and weights for a Gaussian kernel from \r
+// Hable, John ; Borshukov, George ; Hejl, Jim: Fast Skin Shading. In: ShaderX7, ShaderX : Charles River Media, 2009, S. 161–173\r
+\r
+float samplePositions[] = {\r
+  0.000000f,  0.000000f,\r
+  1.633992f,  0.036795f,\r
+  0.177801f,  1.717593f,\r
+  -0.194906f,  0.091094f,\r
+  -0.239737f, -0.220217f,\r
+  -0.003530f, -0.118219f,\r
+  1.320107f, -0.181542f,\r
+  5.970690f,  0.253378f,\r
+  -1.089250f,  4.958349f,\r
+  -4.015465f,  4.156699f,\r
+  -4.063099f, -4.110150f,\r
+  -0.638605f, -6.297663f,\r
+  2.542348f, -3.245901f\r
+};\r
+\r
+float sampleWeights[] = {\r
+  0.220441f,  0.487000f, 0.635000f,\r
+  0.076356f,  0.064487f, 0.039097f,\r
+  0.116515f,  0.103222f, 0.064912f,\r
+  0.064844f,  0.086388f, 0.062272f,\r
+  0.131798f,  0.151695f, 0.103676f,\r
+  0.025690f,  0.042728f, 0.033003f,\r
+  0.048593f,  0.064740f, 0.046131f,\r
+  0.048092f,  0.003042f, 0.000400f,\r
+  0.048845f,  0.005406f, 0.001222f,\r
+  0.051322f,  0.006034f, 0.001420f,\r
+  0.061428f,  0.009152f, 0.002511f,\r
+  0.030936f,  0.002868f, 0.000652f,\r
+  0.073580f,  0.023239f, 0.009703f\r
+};\r
+\r
+struct model {\r
+  std::vector<float> vertices;\r
+  std::vector<GLuint> indices;\r
+\r
+  void draw() {\r
+    if (VAO == 0) initVAO();\r
+    glBindVertexArray(VAO);\r
+    glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);\r
+    glBindVertexArray(0);\r
+  }\r
 \r
 \r
-  const aiScene *scene = importer.ReadFile(\r
-      filename,\r
-      aiProcess_CalcTangentSpace |\r
-      aiProcess_Triangulate |\r
-      aiProcess_JoinIdenticalVertices |\r
-      aiProcess_SortByPType\r
-  );\r
+private:\r
+  void initVAO() {\r
+    GLuint VBO;\r
+    glGenBuffers(1, &VBO);\r
 \r
 \r
-  for (int i = 0; i < scene->mMeshes[0]->mNumVertices; i++) {\r
-    aiVector3D v = scene->mMeshes[0]->mVertices[i];\r
-    vertices.push_back(v.x);\r
-    vertices.push_back(v.y);\r
-    vertices.push_back(v.z);\r
+    GLuint EBO;\r
+    glGenBuffers(1, &EBO);\r
+\r
+    glGenVertexArrays(1, &VAO);\r
+\r
+    glBindVertexArray(VAO);\r
+\r
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);\r
+    glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(),\r
+                vertices.data(), GL_STATIC_DRAW);\r
+\r
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);\r
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(GLuint) * indices.size(),\r
+                indices.data(), GL_STATIC_DRAW);\r
+\r
+    glEnableVertexAttribArray(0);\r
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 6, (void*)(0));\r
+    glEnableVertexAttribArray(1);\r
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 6, (void*)(sizeof(float) * 3));\r
+\r
+    glBindVertexArray(0);\r
   }\r
   }\r
+  GLuint VAO = 0;\r
+};\r
 \r
 \r
-  for (int i = 0; i < scene->mMeshes[0]->mNumFaces; i++) {\r
-    aiFace f = scene->mMeshes[0]->mFaces[i];\r
-    for (int j = 0; j < f.mNumIndices; j++) {\r
-      indices.push_back(f.mIndices[j]);\r
-    }\r
+struct freecam {\r
+  glm::vec3 pos = glm::vec3(0, 0, -1);\r
+  glm::vec2 rot = glm::vec2(0, 0);\r
+\r
+  void update(sf::Window &window) {\r
+    int mouseDeltaX = sf::Mouse::getPosition(window).x - window.getSize().x / 2;\r
+    int mouseDeltaY = sf::Mouse::getPosition(window).y - window.getSize().y / 2;\r
+\r
+    rot.x += mouseDeltaX;\r
+    rot.y += mouseDeltaY;\r
+\r
+    forward = glm::rotate(glm::vec3(0, 0, 1), rot.y / angleFactor, glm::vec3(1, 0, 0));\r
+    forward = glm::rotate(forward, -rot.x / angleFactor, glm::vec3(0, 1, 0));\r
+\r
+    glm::vec3 left = glm::rotate(glm::vec3(0, 0, 1), -rot.x / angleFactor + glm::radians(90.0f), glm::vec3(0, 1, 0));\r
+\r
+    if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::LShift))\r
+      moveFactor = 200;\r
+    else\r
+      moveFactor = 20;\r
+\r
+    if (sf::Keyboard::isKeyPressed(sf::Keyboard::W))\r
+      pos += forward / moveFactor;\r
+    if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))\r
+      pos -= forward / moveFactor;\r
+    if (sf::Keyboard::isKeyPressed(sf::Keyboard::A))\r
+      pos += left / moveFactor;\r
+    if (sf::Keyboard::isKeyPressed(sf::Keyboard::D))\r
+      pos -= left / moveFactor;\r
+\r
+    limit();\r
   }\r
   }\r
-}\r
 \r
 \r
-int main() {\r
-  // Window Setup\r
+  void limit() {\r
+    rot.x = fmod(rot.x, glm::radians(360.0f) * angleFactor);\r
+    rot.y = fmod(rot.y, glm::radians(360.0f) * angleFactor);\r
+  }\r
 \r
 \r
-  sf::ContextSettings settings;\r
-  settings.depthBits = 24;\r
-  settings.antialiasingLevel = 0;\r
-  settings.majorVersion = 4;\r
-  settings.minorVersion = 6;\r
+  glm::mat4 getViewMatrix() {\r
+    forward = glm::rotate(glm::vec3(0, 0, 1), rot.y / angleFactor, glm::vec3(1, 0, 0));\r
+    forward = glm::rotate(forward, -rot.x / angleFactor, glm::vec3(0, 1, 0));\r
+    glm::mat4 result = glm::lookAt(pos, pos + forward, up);\r
+    return result;\r
+  }\r
 \r
 \r
-  sf::Window window(sf::VideoMode(800, 600), "Subsurface Scattering",\r
-                    sf::Style::Default, settings);\r
-  window.setVerticalSyncEnabled(true);\r
+private:\r
+  glm::vec3 forward = glm::vec3(0, 0, 1);\r
+  glm::vec3 up = glm::vec3(0, 1, 0);\r
 \r
 \r
-  window.setActive(true);\r
+  const float angleFactor = 200;\r
+  float moveFactor = 20;\r
+};\r
 \r
 \r
-  // Initialize GLEW\r
+struct arccam {\r
+  glm::vec2 rot = glm::vec2(0, 0);\r
+  float radius = 1;\r
 \r
 \r
-  if (glewInit() != GLEW_OK) {\r
+  void update(sf::Window &window) {\r
+    int mouseDeltaX = sf::Mouse::getPosition(window).x - window.getSize().x / 2;\r
+    int mouseDeltaY = sf::Mouse::getPosition(window).y - window.getSize().y / 2;\r
+\r
+    rot.x += mouseDeltaX;\r
+    rot.y += mouseDeltaY;\r
 \r
 \r
+    limit(-89, 89);\r
   }\r
 \r
   }\r
 \r
-  load("models/Isotrop-upperjaw.ply", vertices, indices);\r
+  void limit(float minY, float maxY) {\r
+    float angleX = rot.x / angleFactor;\r
+    float angleY = rot.y / angleFactor;\r
 \r
 \r
-  // Compile Shaders\r
+    rot.x = fmod(rot.x, glm::radians(360.0f) * angleFactor);\r
 \r
 \r
-  GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);\r
-  glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);\r
-  glCompileShader(vertexShader);\r
+    if (angleY > glm::radians(maxY))\r
+      rot.y = glm::radians(maxY) * angleFactor;\r
+    if (angleY < glm::radians(minY))\r
+      rot.y = glm::radians(minY) * angleFactor;\r
+  }\r
+\r
+  glm::vec3 getPos() {\r
+    float angle = rot.y / angleFactor;\r
+  \r
+    float camY = sin(angle) * exp(radius);\r
+    float camZ = cos(angle) * exp(radius);\r
+\r
+    glm::vec3 result(0.0, camY, camZ);\r
+    return glm::rotate(result, -rot.x / angleFactor, glm::vec3(0, 1, 0));\r
+  }\r
+\r
+  glm::mat4 getViewMatrix() {\r
+    float angle = rot.y / angleFactor;\r
+  \r
+    float camY = sin(angle) * exp(radius);\r
+    float camZ = cos(angle) * exp(radius);\r
+    glm::mat4 result = glm::lookAt(glm::vec3(0.0, camY, camZ), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));\r
+    result = glm::rotate(result, rot.x / angleFactor, glm::vec3(0, 1, 0));\r
+\r
+    return result;\r
+  }\r
 \r
 \r
-  int  success;\r
+private:\r
+  const float angleFactor = 200;\r
+};\r
+\r
+std::string readFile(std::string filename) {\r
+  std::ifstream ifs(filename, std::ios::binary);\r
+  std::string result, line;\r
+  while (std::getline(ifs, line))\r
+    result += line + "\n";\r
+\r
+  return result;\r
+}\r
+\r
+model loadModel(const std::string &filename) {\r
+  Assimp::Importer importer;\r
+\r
+  const aiScene *scene = importer.ReadFile(\r
+      filename, aiProcess_CalcTangentSpace | aiProcess_Triangulate |\r
+                    aiProcess_SortByPType | aiProcess_GenSmoothNormals |\r
+                    aiProcess_GenUVCoords);\r
+\r
+  model result;\r
+\r
+  printf("uv channels: %d\n", scene->mMeshes[0]->GetNumUVChannels());\r
+\r
+  for (int i = 0; i < scene->mMeshes[0]->mNumVertices; i++) {\r
+    aiVector3D v = scene->mMeshes[0]->mVertices[i];\r
+    aiVector3D n = scene->mMeshes[0]->mNormals[i];\r
+    result.vertices.push_back(v.x);\r
+    result.vertices.push_back(v.y);\r
+    result.vertices.push_back(v.z);\r
+    result.vertices.push_back(n.x);\r
+    result.vertices.push_back(n.y);\r
+    result.vertices.push_back(n.z);\r
+  }\r
+\r
+  for (int i = 0; i < scene->mMeshes[0]->mNumFaces; i++) {\r
+    aiFace f = scene->mMeshes[0]->mFaces[i];\r
+    for (int j = 0; j < f.mNumIndices; j++) {\r
+      result.indices.push_back(f.mIndices[j]);\r
+    }\r
+  }\r
+\r
+  return result;\r
+}\r
+\r
+GLuint compileShaders(const char *vertFilename, const char *fragFilename) {\r
+  GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);\r
+  std::string vertSource = readFile(vertFilename);\r
+  const char *vertAddr = vertSource.c_str();\r
+  glShaderSource(vertShader, 1, &vertAddr, NULL);\r
+  glCompileShader(vertShader);\r
+\r
+  int success;\r
   char infoLog[512];\r
   char infoLog[512];\r
-  glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);\r
+  glGetShaderiv(vertShader, GL_COMPILE_STATUS, &success);\r
   if (!success) {\r
   if (!success) {\r
-      glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);\r
-      printf("Error compiling vertex shader: %s\n", infoLog);\r
+    glGetShaderInfoLog(vertShader, 512, NULL, infoLog);\r
+    printf("Error compiling vertex shader(%s): %s\n", vertFilename, infoLog);\r
   }\r
 \r
   }\r
 \r
-  GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);\r
-  glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);\r
-  glCompileShader(fragmentShader);\r
+  GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);\r
+  std::string fragSource = readFile(fragFilename);\r
+  const char *fragAddr = fragSource.c_str();\r
+  glShaderSource(fragShader, 1, &fragAddr, NULL);\r
+  glCompileShader(fragShader);\r
 \r
 \r
-  glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);\r
+  glGetShaderiv(fragShader, GL_COMPILE_STATUS, &success);\r
   if (!success) {\r
   if (!success) {\r
-      glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);\r
-      printf("Error compiling fragment shader: %s\n", infoLog);\r
+    glGetShaderInfoLog(fragShader, 512, NULL, infoLog);\r
+    printf("Error compiling fragment shader(%s): %s\n", fragFilename, infoLog);\r
   }\r
 \r
   // Link Shader Program\r
 \r
   GLuint shaderProgram = glCreateProgram();\r
   }\r
 \r
   // Link Shader Program\r
 \r
   GLuint shaderProgram = glCreateProgram();\r
-  glAttachShader(shaderProgram, vertexShader);\r
-  glAttachShader(shaderProgram, fragmentShader);\r
+  glAttachShader(shaderProgram, vertShader);\r
+  glAttachShader(shaderProgram, fragShader);\r
   glLinkProgram(shaderProgram);\r
   glLinkProgram(shaderProgram);\r
-  \r
+\r
   glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);\r
   if (!success) {\r
   glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);\r
   if (!success) {\r
-      glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);\r
-      printf("Error linking shader program: %s\n", infoLog);\r
+    glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);\r
+    printf("Error linking shader program: %s\n", infoLog);\r
   }\r
 \r
   }\r
 \r
-  glDeleteShader(vertexShader);\r
-  glDeleteShader(fragmentShader);\r
+  glDeleteShader(vertShader);\r
+  glDeleteShader(fragShader);\r
+\r
+  return shaderProgram;\r
+}\r
+\r
+struct framebuffer {\r
+  framebuffer(const char *vertFilename, const char *fragFilename, int width, int height) {\r
+    glGenFramebuffers(1, &fbo);\r
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);\r
+    \r
+    glGenTextures(1, &renderTexture);\r
+    glBindTexture(GL_TEXTURE_2D, renderTexture);\r
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);\r
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);\r
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);\r
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);\r
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);\r
+    //glBindTexture(GL_TEXTURE_2D, 0);\r
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, renderTexture, 0);\r
+\r
+    glGenRenderbuffers(1, &rbo);\r
+    glBindRenderbuffer(GL_RENDERBUFFER, rbo);\r
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);\r
+    //glBindRenderbuffer(GL_RENDERBUFFER, 0);\r
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);\r
+\r
+    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE) {\r
+      printf("Successfully created framebuffer\n");\r
+    }\r
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);\r
+    \r
+    screenShaderProgram = compileShaders(vertFilename, fragFilename);\r
+    glUseProgram(screenShaderProgram);\r
+    glUniform1i(glGetUniformLocation(screenShaderProgram, "screenTexture"), 0);\r
 \r
 \r
-  // Create VBO\r
+    // Screen VAO\r
+    \r
+    glGenBuffers(1, &screenVBO);\r
 \r
 \r
-  GLuint VBO;\r
-  glGenBuffers(1, &VBO);\r
+    glGenVertexArrays(1, &screenVAO);\r
 \r
 \r
-  // Create EBO\r
+    glBindVertexArray(screenVAO);\r
 \r
 \r
-  GLuint EBO;\r
-  glGenBuffers(1, &EBO);\r
+    float screenVerts[] = {\r
+      -1.0f, +1.0f, +0.0f, +1.0f,\r
+      -1.0f, -1.0f, +0.0f, +0.0f,\r
+      +1.0f, -1.0f, +1.0f, +0.0f,\r
   \r
   \r
-  // Create VAO\r
+      -1.0f, +1.0f, +0.0f, +1.0f,\r
+      +1.0f, -1.0f, +1.0f, +0.0f,\r
+      +1.0f, +1.0f, +1.0f, +1.0f,\r
+    };\r
 \r
 \r
-  GLuint VAO;\r
-  glGenVertexArrays(1, &VAO);\r
+    glBindBuffer(GL_ARRAY_BUFFER, screenVBO);\r
+    glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4,\r
+                screenVerts, GL_STATIC_DRAW);\r
 \r
 \r
-  glBindVertexArray(VAO);\r
+    glEnableVertexAttribArray(0);\r
+    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, (void*)(0));\r
+    glEnableVertexAttribArray(1);\r
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, (void*)(sizeof(float) * 2));\r
+\r
+    glBindVertexArray(0);\r
+  }\r
+  ~framebuffer() {\r
+    glDeleteFramebuffers(1, &fbo);\r
+  }\r
   \r
   \r
-  glBindBuffer(GL_ARRAY_BUFFER, VBO);\r
-  glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(), vertices.data(), GL_STATIC_DRAW);\r
+  GLuint fbo;\r
+  GLuint renderTexture;\r
+  GLuint rbo;\r
+  GLuint screenShaderProgram;\r
+  GLuint screenVBO;\r
+  GLuint screenVAO;\r
+};\r
+\r
+int main() {\r
+  // Window Setup\r
+\r
+  const int width = 1600, height = 900;\r
+\r
+  sf::ContextSettings settings;\r
+  settings.depthBits = 24;\r
+  settings.antialiasingLevel = 0;\r
+  settings.majorVersion = 4;\r
+  settings.minorVersion = 6;\r
+\r
+  sf::RenderWindow window(sf::VideoMode(1600, 900), "Subsurface Scattering",\r
+                    sf::Style::Default, settings);\r
+  window.setVerticalSyncEnabled(true);\r
+\r
+  ImGui::SFML::Init(window);\r
+\r
+  // Initialize GLEW\r
+\r
+  if (glewInit() != GLEW_OK) {\r
+  }\r
+\r
+  GLuint shaderProgramShadowmap = compileShaders("shaders/vert_shadowmap.glsl", "shaders/frag_shadowmap.glsl");\r
+  GLuint shaderProgramIrradiance = compileShaders("shaders/vert_irradiance.glsl", "shaders/frag_irradiance.glsl");\r
+\r
+  model m = loadModel("models/Isotrop-upperjaw.ply");\r
   \r
   \r
-  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);\r
-  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(GLuint) * indices.size(), indices.data(), GL_STATIC_DRAW);\r
+  arccam arcCam;\r
+  freecam freeCam;\r
+\r
+  // MVP\r
+\r
+  glm::mat4 model = glm::scale(glm::mat4(1.0f), glm::vec3(0.01f, 0.01f, 0.01f));\r
+\r
+  glm::mat4 view, lightView;\r
 \r
 \r
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 3, NULL);\r
-  glEnableVertexAttribArray(0);\r
+  glm::mat4 proj = glm::perspective(glm::radians(45.0f), (float)window.getSize().x / window.getSize().y, 0.001f, 1000.0f);\r
+  glm::mat4 lightProj = glm::perspective(glm::radians(90.0f), (float)window.getSize().x / window.getSize().y, 0.001f, 1000.0f);\r
 \r
 \r
-  glBindVertexArray(0);\r
+  // Framebuffer\r
 \r
 \r
-  // Perspective\r
+  framebuffer fb_shadowmap("shaders/fbo_vert.glsl", "shaders/fbo_frag.glsl", width, height);\r
+  framebuffer fb_irradiance("shaders/fbo_vert.glsl", "shaders/fbo_frag.glsl", width, height);\r
 \r
 \r
-  glm::mat4 model = glm::mat4(1.0f);\r
+  // Config\r
 \r
 \r
-  glm::mat4 view = glm::translate(glm::mat4(1.0f), glm::vec3(0.0f, 0.0f, -200.0f));\r
+  const struct {\r
+    bool wireframe = false;\r
+    bool freecam = false;\r
+    int renderState = 2;\r
+    float color[3] = { 0.7f, 0.4f, 0.4f };\r
+    glm::vec3 lightPos = glm::vec3(0.0f, 0.0f, 0.03f);\r
+    float transmittanceScale = 0.025f;\r
+    float powBase = 2;\r
+    float powFactor = 1.5;\r
+  } DefaultOptions;\r
 \r
 \r
-  glm::mat4 proj = glm::perspective(glm::radians(45.0f), 800.0f / 600.0f, 0.1f, 1000.0f);\r
+  auto options = DefaultOptions;\r
 \r
 \r
-  bool wireframe = false;\r
+  sf::Clock deltaClock;\r
+\r
+  bool prevMouse = false;\r
 \r
   bool running = true;\r
   while (running) {\r
 \r
   bool running = true;\r
   while (running) {\r
+    // Events\r
+\r
     sf::Event event;\r
     while (window.pollEvent(event)) {\r
     sf::Event event;\r
     while (window.pollEvent(event)) {\r
-      if (event.type == sf::Event::Closed) {\r
+      ImGui::SFML::ProcessEvent(event);\r
+\r
+      if (event.type == sf::Event::EventType::Closed) {\r
         running = false;\r
         running = false;\r
-      } else if (event.type == sf::Event::Resized) {\r
+      } else if (event.type == sf::Event::EventType::Resized) {\r
         glViewport(0, 0, event.size.width, event.size.height);\r
         glViewport(0, 0, event.size.width, event.size.height);\r
-      } else if (event.type == sf::Event::KeyReleased) {\r
+      } else if (event.type == sf::Event::EventType::KeyReleased) {\r
         using keys = sf::Keyboard;\r
         switch (event.key.code) {\r
         using keys = sf::Keyboard;\r
         switch (event.key.code) {\r
-        case keys::W:\r
-          wireframe = !wireframe;\r
-          break;\r
         case keys::Escape:\r
           running = false;\r
           break;\r
         }\r
         case keys::Escape:\r
           running = false;\r
           break;\r
         }\r
+      } else if (event.type == sf::Event::EventType::MouseWheelScrolled) {\r
+        if (! options.freecam) {\r
+          arcCam.radius -= event.mouseWheelScroll.delta / 5.0f;\r
+        }\r
       }\r
     }\r
 \r
       }\r
     }\r
 \r
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);\r
+    // Update Camera\r
+\r
+    if (sf::Mouse::isButtonPressed(sf::Mouse::Right)) {\r
+      window.setMouseCursorVisible(false);\r
+\r
+      if (prevMouse) {\r
+        if (options.freecam)\r
+          freeCam.update(window);\r
+        else\r
+          arcCam.update(window);\r
+      }\r
+\r
+\r
+      sf::Mouse::setPosition(sf::Vector2i(\r
+          window.getSize().x / 2,\r
+          window.getSize().y / 2\r
+        ), window);  \r
+    } else {\r
+      window.setMouseCursorVisible(true);\r
+    }\r
+\r
+    prevMouse = sf::Mouse::isButtonPressed(sf::Mouse::Right);\r
 \r
 \r
+    // Render Shadowmap to fbo\r
+\r
+    glClampColor(GL_CLAMP_READ_COLOR, GL_FALSE);\r
+    glClampColor(GL_CLAMP_VERTEX_COLOR, GL_FALSE);\r
+    glClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);\r
+\r
+    glBindFramebuffer(GL_FRAMEBUFFER, fb_shadowmap.fbo);\r
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);\r
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);\r
     glEnable(GL_DEPTH_TEST);\r
 \r
     glEnable(GL_DEPTH_TEST);\r
 \r
-    if (wireframe)\r
+    if (options.wireframe)\r
       glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);\r
     else\r
       glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);\r
 \r
       glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);\r
     else\r
       glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);\r
 \r
-    model = glm::rotate(model, glm::radians(0.2f), glm::vec3(0.0f, 1.0f, 0.0f));\r
+    glUseProgram(shaderProgramShadowmap);\r
+    \r
+    if (options.freecam)\r
+      view = freeCam.getViewMatrix();\r
+    else\r
+      view = arcCam.getViewMatrix();\r
+    \r
+    lightView = glm::lookAt(options.lightPos, glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));\r
+    \r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramShadowmap, "model"),\r
+      1, GL_FALSE, glm::value_ptr(model));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramShadowmap, "lightView"),\r
+      1, GL_FALSE, glm::value_ptr(lightView));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramShadowmap, "projection"),\r
+      1, GL_FALSE, glm::value_ptr(lightProj));\r
+\r
+    glUniform3fv(\r
+      glGetUniformLocation(shaderProgramShadowmap, "lightPos"),\r
+      1, glm::value_ptr(options.lightPos));\r
+\r
+    m.draw();\r
+\r
+    // Render irradiance map to fbo\r
+\r
+    glBindFramebuffer(GL_FRAMEBUFFER, fb_irradiance.fbo);\r
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);\r
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);\r
+    glEnable(GL_DEPTH_TEST);\r
 \r
 \r
-    glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "model"), 1, GL_FALSE, glm::value_ptr(model));\r
-    glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "view"), 1, GL_FALSE, glm::value_ptr(view));\r
-    glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "projection"), 1, GL_FALSE, glm::value_ptr(proj));\r
+    if (options.wireframe)\r
+      glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);\r
+    else\r
+      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);\r
 \r
 \r
-    glUseProgram(shaderProgram);\r
-    glBindVertexArray(VAO);\r
-    glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);\r
+    glUseProgram(shaderProgramIrradiance);\r
+    \r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "model"),\r
+      1, GL_FALSE, glm::value_ptr(model));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "view"),\r
+      1, GL_FALSE, glm::value_ptr(view));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "lightView"),\r
+      1, GL_FALSE, glm::value_ptr(lightView));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "lightViewInv"),\r
+      1, GL_FALSE, glm::value_ptr(glm::inverse(lightView)));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "projection"),\r
+      1, GL_FALSE, glm::value_ptr(proj));\r
+    glUniformMatrix4fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "lightProjection"),\r
+      1, GL_FALSE, glm::value_ptr(lightProj));\r
+    glUniform1i(glGetUniformLocation(shaderProgramIrradiance, "screenWidth"), window.getSize().x);\r
+    glUniform1i(glGetUniformLocation(shaderProgramIrradiance, "screenHeight"), window.getSize().y);\r
+    glUniform1fv(glGetUniformLocation(shaderProgramIrradiance, "samplePositions"), 13, samplePositions);\r
+    glUniform3fv(glGetUniformLocation(shaderProgramIrradiance, "sampleWeights"), 13, sampleWeights);\r
+\r
+    glUniform1f(\r
+      glGetUniformLocation(shaderProgramIrradiance, "transmittanceScale"),\r
+      options.transmittanceScale);\r
+    glUniform1i(\r
+      glGetUniformLocation(shaderProgramIrradiance, "renderState"),\r
+      options.renderState);\r
+    glUniform1f(\r
+      glGetUniformLocation(shaderProgramIrradiance, "powBase"),\r
+      options.powBase);\r
+    glUniform1f(\r
+      glGetUniformLocation(shaderProgramIrradiance, "powFactor"),\r
+      options.powFactor);\r
+\r
+    glUniform3fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "objectColor"),\r
+      1, options.color);\r
+    glUniform3f(\r
+      glGetUniformLocation(shaderProgramIrradiance, "lightColor"),\r
+      1.0f, 1.0f, 1.0f);\r
+    glUniform3fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "lightPos"),\r
+      1, glm::value_ptr(options.lightPos));\r
+    glUniform3fv(\r
+      glGetUniformLocation(shaderProgramIrradiance, "viewPos"),\r
+      1, glm::value_ptr(options.freecam ? freeCam.pos : arcCam.getPos()));\r
+      \r
+      \r
+    glUniform1i(glGetUniformLocation(shaderProgramIrradiance, "shadowmapTexture"), 0);\r
+    glActiveTexture(GL_TEXTURE0 + 0);\r
+    glBindTexture(GL_TEXTURE_2D, fb_shadowmap.renderTexture);\r
+\r
+    m.draw();\r
+\r
+    // Render fbos to screen and calculate light spread/translucency in shader\r
+    \r
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);\r
+\r
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);\r
+    glDisable(GL_DEPTH_TEST);\r
+    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);\r
+    glClear(GL_COLOR_BUFFER_BIT);\r
+    glUseProgram(fb_irradiance.screenShaderProgram);\r
+\r
+    glUniform1i(glGetUniformLocation(fb_irradiance.screenShaderProgram, "screenWidth"), window.getSize().x);\r
+    glUniform1i(glGetUniformLocation(fb_irradiance.screenShaderProgram, "screenHeight"), window.getSize().y);\r
+    glUniform1i(glGetUniformLocation(fb_irradiance.screenShaderProgram, "renderState"), options.renderState);\r
+    glUniform2fv(glGetUniformLocation(fb_irradiance.screenShaderProgram, "samplePositions"), 13, samplePositions);\r
+    glUniform3fv(glGetUniformLocation(fb_irradiance.screenShaderProgram, "sampleWeights"), 13, sampleWeights);\r
+\r
+    glBindVertexArray(fb_irradiance.screenVAO);\r
+    glUniform1i(glGetUniformLocation(fb_irradiance.screenShaderProgram, "shadowmapTexture"), 0);\r
+    glUniform1i(glGetUniformLocation(fb_irradiance.screenShaderProgram, "irradianceTexture"), 1);\r
+    glActiveTexture(GL_TEXTURE0 + 0);\r
+    glBindTexture(GL_TEXTURE_2D, fb_shadowmap.renderTexture);\r
+    glActiveTexture(GL_TEXTURE0 + 1);\r
+    glBindTexture(GL_TEXTURE_2D, fb_irradiance.renderTexture);\r
+    glDrawArrays(GL_TRIANGLES, 0, 6);\r
     glBindVertexArray(0);\r
 \r
     glBindVertexArray(0);\r
 \r
+    // menu\r
+\r
+    ImGui::SFML::Update(window, deltaClock.restart());\r
+\r
+    ImGui::Begin("Options");\r
+    ImGui::Checkbox("Wireframe", &options.wireframe);\r
+    ImGui::Checkbox("Free Cam", &options.freecam);\r
+    ImGui::DragFloat3("Color", options.color, 0.01, 0, 1);\r
+    ImGui::DragFloat("Transmittance Scale", &options.transmittanceScale, 0.0001f, 0, 0.3);\r
+    ImGui::DragFloat3("Light Pos", glm::value_ptr(options.lightPos), 0.01, -5, 5);\r
+    if (options.freecam) {\r
+      ImGui::LabelText("Position", "%f %f %f", freeCam.pos.x, freeCam.pos.y, freeCam.pos.z);\r
+      ImGui::LabelText("Rotation", "%f %f", freeCam.rot.x, freeCam.rot.y);\r
+      if (ImGui::Button("Reset")) {\r
+        freeCam.pos = glm::vec3(0, 0, -1);\r
+        freeCam.rot = glm::vec2(0);\r
+        options = DefaultOptions;\r
+      }\r
+    } else {\r
+      ImGui::LabelText("Rotation", "%f %f", arcCam.rot.x, arcCam.rot.y);\r
+      ImGui::DragFloat("Radius", &arcCam.radius, 0.01f, -1.0f, 1.0f);\r
+      if (ImGui::Button("Reset")) {\r
+        arcCam.rot = glm::vec2(0);\r
+        arcCam.radius = 1;\r
+        options = DefaultOptions;\r
+      }\r
+    }\r
+    ImGui::End();\r
+\r
+    ImGui::SFML::Render(window);\r
+\r
     window.display();\r
   }\r
 \r
   return 0;\r
     window.display();\r
   }\r
 \r
   return 0;\r
-}
\ No newline at end of file
+}\r
Screen Space and Texture Space Subsurface Scattering using C++/GLSL