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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 diffuse.png and specular.png with
// some of the other texture files in the data/ directory.
diffuse_ramp_.InitFromFile(Platform::FindFile("diffuse.png", search_path_));
diffuse_ramp_.set_wrap_mode(GL_CLAMP_TO_EDGE);
specular_ramp_.InitFromFile(Platform::FindFile("specular.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("modelViewMatrix", model_view_matrix);
outline_shaderprog_.SetUniform("normalMatrix", 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_);
}
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