add qtimgui renderer library

2026-08-22 14:17:29 +02:00 · 2018-10-24 19:00:58 +02:00
parent b948b76c8e
commit 40722c098d
13 changed files with 837 additions and 0 deletions
@@ -0,0 +1,85 @@
+#include <QtImGui.h>
+#include <imgui.h>
+#include <QApplication>
+#include <QTimer>
+#include <QSurfaceFormat>
+#include <QOpenGLWidget>
+#include <QOpenGLExtraFunctions>
+
+class DemoWindow : public QOpenGLWidget, private QOpenGLExtraFunctions
+{
+protected:
+    void initializeGL() override
+    {
+        initializeOpenGLFunctions();
+        QtImGui::initialize(this);
+    }
+    void paintGL() override
+    {
+        QtImGui::newFrame();
+
+        // 1. Show a simple window
+        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
+        {
+            static float f = 0.0f;
+            ImGui::Text("Hello, world!");
+            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+            ImGui::ColorEdit3("clear color", (float*)&clear_color);
+            if (ImGui::Button("Test Window")) show_test_window ^= 1;
+            if (ImGui::Button("Another Window")) show_another_window ^= 1;
+            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+        }
+
+        // 2. Show another simple window, this time using an explicit Begin/End pair
+        if (show_another_window)
+        {
+            ImGui::SetNextWindowSize(ImVec2(200,100), ImGuiSetCond_FirstUseEver);
+            ImGui::Begin("Another Window", &show_another_window);
+            ImGui::Text("Hello");
+            ImGui::End();
+        }
+
+        // 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow()
+        if (show_test_window)
+        {
+            ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiSetCond_FirstUseEver);
+            ImGui::ShowTestWindow();
+        }
+
+        // Do render before ImGui UI is rendered
+        glViewport(0, 0, width(), height());
+        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        ImGui::Render();
+    }
+
+private:
+    bool show_test_window = true;
+    bool show_another_window = false;
+    ImVec4 clear_color = ImColor(114, 144, 154);
+};
+
+int main(int argc, char *argv[])
+{
+    // Use OpenGL 3 Core Profile
+    QSurfaceFormat glFormat;
+    glFormat.setVersion(3, 3);
+    glFormat.setProfile(QSurfaceFormat::CoreProfile);
+    QSurfaceFormat::setDefaultFormat(glFormat);
+
+    QApplication a(argc, argv);
+
+    // Show window
+    DemoWindow w;
+    w.setWindowTitle("QtImGui widget example");
+    w.resize(1280, 720);
+    w.show();
+
+    // Update at 60 fps
+    QTimer timer;
+    QObject::connect(&timer, SIGNAL(timeout()), &w, SLOT(update()));
+    timer.start(16);
+
+    return a.exec();
+}