Merge branch 'support-code' of https://github.umn.edu/umn-csci-4611-f21/shared-upstream

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diff --git a/dev/a5-artrender/artrender_app.cc b/dev/a5-artrender/artrender_app.cc
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+/** CSci-4611 Assignment 5:  Art Render
+ */
+
+#include "artrender_app.h"
+#include "config.h"
+
+#include <iostream>
+#include <sstream>
+
+
+
+using namespace std;
+
+ArtRenderApp::ArtRenderApp() : GraphicsApp(1024,768, "Art Render"),
+    shader_style_(0), current_model_(0), light_pos_(1.5, 1.5, 1.5),
+    diffuse_ramp_(GL_CLAMP_TO_EDGE), specular_ramp_(GL_CLAMP_TO_EDGE)
+{
+    // Define a search path for finding data files (images and shaders)
+    search_path_.push_back(".");
+    search_path_.push_back("./data");
+    search_path_.push_back("./shaders");
+    search_path_.push_back(DATA_DIR_INSTALL);
+    search_path_.push_back(DATA_DIR_BUILD);
+    search_path_.push_back(SHADERS_DIR_INSTALL);
+    search_path_.push_back(SHADERS_DIR_BUILD);
+    
+    // NOTE: YOU CAN COMMENT OUT SOME OF THESE IF THE APP IS LOADING TOO SLOWLY
+    // THE MODEL_FILES ARRAY JUST NEEDS TO HOLD AT LEAST ONE MODEL.
+	// Also, compiling in Release mode will optimize the loading of text files a lot.
+    model_files_.push_back("bunny.obj");
+    model_files_.push_back("chamferedCube.obj");
+    model_files_.push_back("cow.obj");
+    model_files_.push_back("hippo.obj");
+    model_files_.push_back("maxplanck.obj");
+    model_files_.push_back("sphere.obj");
+    model_files_.push_back("teapot.obj");
+}
+
+
+ArtRenderApp::~ArtRenderApp() {
+}
+
+
+void ArtRenderApp::InitNanoGUI() {
+	// Setup the GUI window
+	nanogui::Window* window = new nanogui::Window(screen(), "Shading Style");
+	window->setPosition(Eigen::Vector2i(10, 10));
+	window->setSize(Eigen::Vector2i(200, 100));
+	window->setLayout(new nanogui::GroupLayout());
+
+	new nanogui::Label(window, "Dynamically Reload", "sans-bold");
+
+	nanogui::Button* btnReload = new nanogui::Button(window, "Reload Shaders and Textures");
+	btnReload->setCallback(std::bind(&ArtRenderApp::OnReloadBtnPressed, this));
+
+
+	new nanogui::Label(window, "Rendering Style", "sans-bold");
+
+	nanogui::Button* btnGouraud = new nanogui::Button(window, "Gouraud Shading");
+	btnGouraud->setCallback(std::bind(&ArtRenderApp::OnGouraudBtnPressed, this));
+
+	nanogui::Button* btnPhong = new nanogui::Button(window, "Phong Shading");
+	btnPhong->setCallback(std::bind(&ArtRenderApp::OnPhongBtnPressed, this));
+
+	nanogui::Button* btnArtsy = new nanogui::Button(window, "Artsy Shading");
+	btnArtsy->setCallback(std::bind(&ArtRenderApp::OnArtsyBtnPressed, this));
+
+
+	new nanogui::Label(window, "Model", "sans-bold");
+
+	for (int i = 0; i < model_files_.size(); i++) {
+		nanogui::Button* btn = new nanogui::Button(window, model_files_[i]);
+		btn->setCallback([this, i] { this->current_model_ = i; });
+		Mesh m;
+		m.LoadFromOBJ(Platform::FindFile(model_files_[i], search_path_));
+		meshes_.push_back(m);
+		EdgeMesh em;
+		em.CreateFromMesh(m);
+		edge_meshes_.push_back(em);
+	}
+	screen()->performLayout();
+}
+
+
+void ArtRenderApp::OnLeftMouseDown(const Point2 &pos) {
+    Point2 normalizedMousePos = PixelsToNormalizedDeviceCoords(pos);
+    float mouseZ = ReadZValueAtPixel(pos);
+    uni_cam_.OnButtonDown(normalizedMousePos, mouseZ);
+}
+
+
+void ArtRenderApp::OnLeftMouseDrag(const Point2 &pos, const Vector2 &delta) {
+    Point2 normalizedMousePos = PixelsToNormalizedDeviceCoords(pos);
+    uni_cam_.OnDrag(normalizedMousePos);
+}
+
+
+void ArtRenderApp::OnLeftMouseUp(const Point2 &pos) {
+    Point2 normalizedMousePos = PixelsToNormalizedDeviceCoords(pos);
+    uni_cam_.OnButtonUp(normalizedMousePos);
+}
+
+
+void ArtRenderApp::UpdateSimulation(double dt)  {
+    uni_cam_.AdvanceAnimation(dt);
+}
+
+
+void ArtRenderApp::OnReloadBtnPressed() {
+	LoadShadersAndTextures();
+}
+
+void ArtRenderApp::OnGouraudBtnPressed() {
+	shader_style_ = 0;
+}
+
+void ArtRenderApp::OnPhongBtnPressed() {
+	shader_style_ = 1;
+}
+
+void ArtRenderApp::OnArtsyBtnPressed() {
+	shader_style_ = 2;
+}
+
+
+
+void ArtRenderApp::InitOpenGL() {
+    // Set up the camera in a good position to see the model
+	proj_matrix_ = Matrix4::Perspective(30, aspect_ratio(), 0.1f, 50.0f);
+    uni_cam_.set_view_matrix(Matrix4::LookAt(Point3(0,0,3), Point3(0,0,0), Vector3(0,1,0)));
+    glClearColor(0.7f, 0.7f, 0.7f, 1.0f);
+
+	// Customize the lighting used for the quick shapes default shader to make the
+	// ambient really bright since we're using it to draw the yellow "light bulb" 
+	// in the scene.
+	DefaultShader::LightProperties qs_light;
+	qs_light.ambient_intensity = Color(0.8f, 0.8f, 0.8f);
+	qs_light.diffuse_intensity = Color(0.4f, 0.4f, 0.4f);
+	qs_light.specular_intensity = Color(0.0f, 0.0f, 0.0f);
+	quick_shapes_.default_shader()->SetLight(0, qs_light);
+
+	LoadShadersAndTextures();
+}
+
+
+void ArtRenderApp::LoadShadersAndTextures() {
+	// (Re)loads and (re)compiles all of the shader programs text files.  And, (re)loads the
+	// textures from file as well.
+
+	gouraud_shaderprog_.AddVertexShaderFromFile(Platform::FindFile("gouraud.vert", search_path_));
+	gouraud_shaderprog_.AddFragmentShaderFromFile(Platform::FindFile("gouraud.frag", search_path_));
+	gouraud_shaderprog_.LinkProgram();
+
+	phong_shaderprog_.AddVertexShaderFromFile(Platform::FindFile("phong.vert", search_path_));
+	phong_shaderprog_.AddFragmentShaderFromFile(Platform::FindFile("phong.frag", search_path_));
+	phong_shaderprog_.LinkProgram();
+
+	artsy_shaderprog_.AddVertexShaderFromFile(Platform::FindFile("artsy.vert", search_path_));
+	artsy_shaderprog_.AddFragmentShaderFromFile(Platform::FindFile("artsy.frag", search_path_));
+	artsy_shaderprog_.LinkProgram();
+
+	outline_shaderprog_.AddVertexShaderFromFile(Platform::FindFile("outline.vert", search_path_));
+	outline_shaderprog_.AddFragmentShaderFromFile(Platform::FindFile("outline.frag", search_path_));
+	outline_shaderprog_.LinkProgram();
+
+	// To try out different shading styles, you can replace toonDiffuse.png and toonSpecular.png with
+	// some of the other texture files in the data/ directory.
+	diffuse_ramp_.InitFromFile(Platform::FindFile("toonDiffuse.png", search_path_));
+	diffuse_ramp_.set_wrap_mode(GL_CLAMP_TO_EDGE);
+
+	specular_ramp_.InitFromFile(Platform::FindFile("toonSpecular.png", search_path_));
+	specular_ramp_.set_wrap_mode(GL_CLAMP_TO_EDGE);
+}
+
+
+void ArtRenderApp::DrawUsingOpenGL() {
+    // Just the identity matrix
+    Matrix4 model_matrix;
+    
+    // Lighting parameters
+    static const Color Ia(0.3f, 0.3f, 0.3f, 1.0f);
+    static const Color Id(0.7f, 0.7f, 0.7f, 1.0f);
+    static const Color Is(1.0f, 1.0f, 1.0f, 1.0f);
+    
+    // Material parameters
+    static const Color ka(1.0f, 0.4f, 0.4f, 1.0f);
+    static const Color kd(1.0f, 0.4f, 0.4f, 1.0f);
+    static const Color ks(0.6f, 0.6f, 0.6f, 1.0f);
+    static const float s = 50.0f;
+    
+    // Precompute items needed in the shader
+    
+    // Light positions are usually defined in world space.  For lighting calculations
+    // we need the position of the light in view space (a.k.a. eye space).
+    Point3 light_in_eye_space = uni_cam_.view_matrix() * light_pos_;
+    
+    // The shader also needs these matrices
+    Matrix4 model_view_matrix = uni_cam_.view_matrix()*model_matrix;
+    Matrix4 normal_matrix = model_view_matrix.Inverse().Transpose();
+    
+    // Make sure the default option to only draw front facing triangles is set
+    glEnable(GL_CULL_FACE);
+    
+	if (shader_style_ == 0) {
+
+		// Render the current model's mesh using the Gouraud shader program
+		gouraud_shaderprog_.UseProgram();
+		gouraud_shaderprog_.SetUniform("model_view_matrix", model_view_matrix);
+		gouraud_shaderprog_.SetUniform("normal_matrix", normal_matrix);
+		gouraud_shaderprog_.SetUniform("proj_matrix", proj_matrix_);
+		gouraud_shaderprog_.SetUniform("ka", ka);
+		gouraud_shaderprog_.SetUniform("kd", kd);
+		gouraud_shaderprog_.SetUniform("ks", ks);
+		gouraud_shaderprog_.SetUniform("s", s);
+		gouraud_shaderprog_.SetUniform("light_in_eye_space", light_in_eye_space);
+		gouraud_shaderprog_.SetUniform("Ia", Ia);
+		gouraud_shaderprog_.SetUniform("Id", Id);
+		gouraud_shaderprog_.SetUniform("Is", Is);
+		meshes_[current_model_].Draw();
+		gouraud_shaderprog_.StopProgram();
+
+	}
+	if (shader_style_ == 1) {
+
+		// Render the current model's mesh using the Phong shader program
+		phong_shaderprog_.UseProgram();
+		phong_shaderprog_.SetUniform("model_view_matrix", model_view_matrix);
+		phong_shaderprog_.SetUniform("normal_matrix", normal_matrix);
+		phong_shaderprog_.SetUniform("proj_matrix", proj_matrix_);
+		phong_shaderprog_.SetUniform("ka", ka);
+		phong_shaderprog_.SetUniform("kd", kd);
+		phong_shaderprog_.SetUniform("ks", ks);
+		phong_shaderprog_.SetUniform("s", s);
+		phong_shaderprog_.SetUniform("light_in_eye_space", light_in_eye_space);
+		phong_shaderprog_.SetUniform("Ia", Ia);
+		phong_shaderprog_.SetUniform("Id", Id);
+		phong_shaderprog_.SetUniform("Is", Is);
+		meshes_[current_model_].Draw();
+		phong_shaderprog_.StopProgram();
+
+	}
+	else if (shader_style_ == 2) {
+
+		// Rendering using the Artsy shader programs
+
+		// Step 1: Use the toon shader to draw the object's mesh
+		artsy_shaderprog_.UseProgram();
+		artsy_shaderprog_.SetUniform("model_view_matrix", model_view_matrix);
+		artsy_shaderprog_.SetUniform("normal_matrix", normal_matrix);
+		artsy_shaderprog_.SetUniform("proj_matrix", proj_matrix_);
+		artsy_shaderprog_.SetUniform("ka", ka);
+		artsy_shaderprog_.SetUniform("kd", kd);
+		artsy_shaderprog_.SetUniform("ks", ks);
+		artsy_shaderprog_.SetUniform("s", s);
+		artsy_shaderprog_.SetUniform("light_in_eye_space", light_in_eye_space);
+		artsy_shaderprog_.SetUniform("Ia", Ia);
+		artsy_shaderprog_.SetUniform("Id", Id);
+		artsy_shaderprog_.SetUniform("Is", Is);
+		artsy_shaderprog_.BindTexture("diffuse_ramp", diffuse_ramp_);
+		artsy_shaderprog_.BindTexture("specular_ramp", specular_ramp_);
+		meshes_[current_model_].Draw();
+		artsy_shaderprog_.StopProgram();
+
+
+		// Step 2: Draw the silhouette edge using the edge mesh and outline shader
+
+		// Disable back face culling so OpenGL will draw both front and back facing triangles
+		glDisable(GL_CULL_FACE);
+
+		// Set the OpenGL polygon offset so it will draw triangles even if they
+		// exactly on top of another triangle
+		glEnable(GL_POLYGON_OFFSET_FILL);
+		glPolygonOffset(1, 1);
+
+		static const float thickness = 0.01f;
+
+		// Draw edge mesh
+		outline_shaderprog_.UseProgram();
+		outline_shaderprog_.SetUniform("model_view_matrix", model_view_matrix);
+		outline_shaderprog_.SetUniform("normal_matrix", normal_matrix);
+		outline_shaderprog_.SetUniform("proj_matrix", proj_matrix_);
+		outline_shaderprog_.SetUniform("thickness", thickness);
+		edge_meshes_[current_model_].Draw();
+		outline_shaderprog_.StopProgram();
+
+	}
+
+	// Draw a little yellow sphere at the location of the light source
+	Matrix4 light_model = Matrix4::Translation(light_pos_ - Point3(0, 0, 0)) *
+		Matrix4::Scale(Vector3(0.1f, 0.1f, 0.1f));
+	quick_shapes_.DrawSphere(light_model, uni_cam_.view_matrix(), proj_matrix_, Color(1, 1, 0));
+
+    // Draw the UniCam widget when in rotation mode
+    uni_cam_.Draw(proj_matrix_);
+}
+