From d818ccd4692a8bbf3c2f35b310a93c9dea88cf73 Mon Sep 17 00:00:00 2001
From: Linloir <3145078758@qq.com>
Date: Sat, 17 Dec 2022 11:41:55 +0800
Subject: [PATCH] [UI][ADD] Model thumbnail widget

---
 FinalProject/modelthumbnailwidget.cpp | 75 +++++++++++++++++++++++++++
 FinalProject/modelthumbnailwidget.h   | 30 +++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 FinalProject/modelthumbnailwidget.cpp
 create mode 100644 FinalProject/modelthumbnailwidget.h

diff --git a/FinalProject/modelthumbnailwidget.cpp b/FinalProject/modelthumbnailwidget.cpp
new file mode 100644
index 0000000..b6e1fcf
--- /dev/null
+++ b/FinalProject/modelthumbnailwidget.cpp
@@ -0,0 +1,75 @@
+#include <qfile.h>
+#include <qdir.h>
+
+#include "modelthumbnailwidget.h"
+
+ModelThumbnailWidget::ModelThumbnailWidget(Model* model, QWidget* parent) : 
+    QOpenGLWidget(parent), _model(model)
+{
+    // OpenGL initialize
+    QSurfaceFormat format;
+    format.setProfile(QSurfaceFormat::CoreProfile);
+    format.setVersion(4, 3);
+    setFormat(format);
+
+    // Create a folder
+    QDir dir("./temp/shaders");
+    if (!dir.exists()) {
+        dir.mkpath(".");
+    }
+
+    // Copy the shaders to the folder
+    if (QFile::exists("./temp/shaders/vertexshader.vs")) {
+        QFile::remove("./temp/shaders/vertexshader.vs");
+    }
+    QFile::copy(":/shaders/vertexshader.vs", "./temp/shaders/vertexshader.vs");
+    QFile::setPermissions("./temp/shaders/vertexshader.vs", QFileDevice::ReadOwner | QFileDevice::WriteOwner);
+    if (QFile::exists("./temp/shaders/fragmentshader.fs")) {
+        QFile::remove("./temp/shaders/fragmentshader.fs");
+    }
+    QFile::copy(":/shaders/fragmentshader.fs", "./temp/shaders/fragmentshader.fs");
+    QFile::setPermissions("./temp/shaders/fragmentshader.fs", QFile::ReadOwner | QFile::WriteOwner);
+}
+
+ModelThumbnailWidget::~ModelThumbnailWidget() {
+}
+
+void ModelThumbnailWidget::initializeGL() {
+    initializeOpenGLFunctions();
+
+    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glEnable(GL_DEPTH_TEST);
+
+    _shaderProgram.ensureInitialized();
+    
+    VertexShader vertexShader("./temp/shaders/vertexshader.vs");
+    FragmentShader fragmentShader("./temp/shaders/fragmentshader.fs");
+    _shaderProgram.attachShader(vertexShader);
+    _shaderProgram.attachShader(fragmentShader);
+    vertexShader.dispose();
+    fragmentShader.dispose();
+
+    _object.setModel(_model->copyToCurrentContext());
+    _camera.setPosition(glm::vec3(0.0f, 0.0f, 7.0f));
+}
+
+void ModelThumbnailWidget::paintGL() {
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    _shaderProgram.bind();
+    
+    glm::mat4 view = _camera.viewMatrix();
+    glm::mat4 projection = glm::perspective(glm::radians(_camera.zoomVal()), (float)width() / (float)height(), 0.1f, 100.0f);
+    _shaderProgram.setUniform("view", view);
+    _shaderProgram.setUniform("projection", projection);
+    
+    _object.render(_shaderProgram);
+    
+    _shaderProgram.unbind();
+}
+
+void ModelThumbnailWidget::resizeGL(int w, int h) {
+    glViewport(0, 0, w, h);
+}
\ No newline at end of file
diff --git a/FinalProject/modelthumbnailwidget.h b/FinalProject/modelthumbnailwidget.h
new file mode 100644
index 0000000..05377ed
--- /dev/null
+++ b/FinalProject/modelthumbnailwidget.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <QtOpenGLWidgets/qopenglwidget.h>
+#include <qopenglfunctions.h>
+#include <qevent.h>
+
+#include "model.h"
+#include "camera.h"
+#include "shader.h"
+#include "renderable.h"
+
+class ModelThumbnailWidget : public QOpenGLWidget, protected QOpenGLFunctions
+{
+    Q_OBJECT
+
+public:
+    ModelThumbnailWidget(Model* model, QWidget* parent = 0);
+    ~ModelThumbnailWidget();
+
+private:
+    Model* _model = nullptr;
+    Renderable _object = Renderable::empty();
+    ShaderProgram _shaderProgram = ShaderProgram::empty();
+    Camera _camera;
+    
+protected:
+    virtual void initializeGL() override;
+    virtual void paintGL() override;
+    virtual void resizeGL(int w, int h) override;
+};