add helper function for new imgui frame

common/ux-alignment.cpp

@@ -4,6 +4,7 @@
 #include "ux-alignment.h"
 #include <imgui.h>
 #include <imgui_impl_glfw.h>
+#include <realsense_imgui.h>
 #include <vector>
 #include <memory>
 
@@ -49,8 +50,7 @@ bool is_gui_aligned(GLFWwindow *win)
 
         glfwSwapBuffers(win);
 
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
 
         SetFocus(hwn);
 

common/ux-window.cpp

@@ -11,6 +11,7 @@
 #include <imgui.h>
 #include <imgui_impl_glfw.h>
 #include <imgui_impl_opengl3.h>
+#include <realsense_imgui.h>
 
 #include "device-model.h"
 
@@ -222,9 +223,7 @@ namespace rs2
             if (_use_glsl_proc) rs2::gl::shutdown_processing();
 
             ImGui::GetIO().Fonts->ClearFonts();  // To be refactored into Viewer theme object
-            ImGui_ImplOpenGL3_Shutdown();
-            ImGui_ImplGlfw_Shutdown();
-            ImGui::DestroyContext();
+            ImGui::PopNewFrame();
             glfwDestroyWindow(_win);
             glfwDestroyCursor(_hand_cursor);
             glfwDestroyCursor(_cross_cursor);
@@ -671,7 +670,7 @@ namespace rs2
         }
 
         ImGui::GetIO().Fonts->ClearFonts();  // To be refactored into Viewer theme object
-        ImGui_ImplGlfw_Shutdown();
+        ImGui::PopNewFrame();
         glfwDestroyWindow(_win);
 
         glfwDestroyCursor(_hand_cursor);
@@ -757,9 +756,7 @@ namespace rs2
         ImGui::GetIO().MouseWheel = _mouse.ui_wheel;
         _mouse.ui_wheel = 0.f;
 
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
     }
 
     void ux_window::begin_viewport()

examples/align-advanced/rs-align-advanced.cpp

@@ -116,18 +116,14 @@ int main(int argc, char * argv[]) try
         renderer.show(pip_stream);
 
         // Using ImGui library to provide a slide controller to select the depth clipping distance
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
         render_slider({ 5.f, 0, w, h }, depth_clipping_distance);
         ImGui::Render();
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 
     }
     // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     return EXIT_SUCCESS;
 }
 catch (const rs2::error & e)

examples/align-gl/rs-align-gl.cpp

@@ -130,17 +130,12 @@ int main(int argc, char * argv[]) try
         glDisable(GL_BLEND);
 
         // Render the UI:
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
         render_slider({ 15.f, app.height() - 60, app.width() - 30, app.height() }, &alpha, &dir);
         ImGui::Render();
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
     }
-    // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     return EXIT_SUCCESS;
 }
 catch (const rs2::error & e)

examples/align/rs-align.cpp

@@ -119,17 +119,12 @@ int main(int argc, char * argv[]) try
         glDisable(GL_BLEND);
 
         // Render the UI:
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
         render_slider({ 15.f, app.height() - 60, app.width() - 30, app.height() }, &alpha, &dir);
         ImGui::Render();
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
     }
-    // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     return EXIT_SUCCESS;
 }
 catch (const rs2::error & e)

examples/example-imgui.hpp

@@ -10,6 +10,7 @@
 #include "example.hpp"
 #include <imgui.h>
 #include <imgui_impl_glfw.h>
+#include <imgui_impl_opengl3.h>
 
 
 //////////////////////////////
@@ -163,9 +164,6 @@ class hdr_widgets {
     //we need slider 2 to be showen before slider 1 (otherwise slider 1 padding is covering slider 2)
     void render_widgets() {
 
-        //start a new frame of ImGui
-        ImGui_ImplGlfw_NewFrame();
-
         _exposure_slider_seq_2.show();
         _exposure_slider_seq_1.show();
         _gain_slider_seq_2.show();
@@ -183,7 +181,7 @@ class hdr_widgets {
 
         //render the ImGui features: sliders and text
         ImGui::Render();
-
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
     }
 
     // return a reference to frames map

examples/hdr/rs-hdr.cpp

@@ -150,21 +150,14 @@ int main() try
 
         //update frames in frames map in hdr_widgets
         hdr_widgets.update_frames_map(infrared_frame, depth_frame, hdr_frame, hdr_seq_id, hdr_seq_size);
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
         //render hdr widgets sliders and text boxes
         hdr_widgets.render_widgets();
 
         //the show method, when applied on frame map, break it to frames and upload each frame into its specific tile
         app.show(hdr_widgets.get_frames_map());
-        ImGui::Render();
-        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
     }
-    // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     return EXIT_SUCCESS;
 }
 catch (const rs2::error& e)

examples/post-processing/rs-post-processing.cpp

@@ -226,10 +226,7 @@ int main(int argc, char * argv[]) try
     // (Not the safest way to join a thread, please wrap your threads in some RAII manner)
     stopped = true;
     processing_thread.join();
-    // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     return EXIT_SUCCESS;
 }
 catch (const rs2::error & e)
@@ -265,9 +262,7 @@ void render_ui(float w, float h, std::vector<filter_options>& filters)
         | ImGuiWindowFlags_NoResize
         | ImGuiWindowFlags_NoMove;
 
-    ImGui_ImplOpenGL3_NewFrame();
-    ImGui_ImplGlfw_NewFrame();
-    ImGui::NewFrame();
+    ImGui::PushNewFrame();
     ImGui::SetNextWindowSize({ w, h });
     ImGui::GetStyle().Colors[ImGuiCol_FrameBg] = ImVec4(0.2f, 0.2f, 0.2f, 1.0f);
     ImGui::GetStyle().Colors[ImGuiCol_FrameBgHovered] = ImVec4(0.3f, 0.3f, 0.3f, 1.0f);

examples/record-playback/rs-record-playback.cpp

@@ -68,9 +68,7 @@ int main(int argc, char * argv[]) try
             | ImGuiWindowFlags_NoResize
             | ImGuiWindowFlags_NoMove;
 
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
         ImGui::SetNextWindowPos(ImVec2(0, 0));
         ImGui::SetNextWindowSize({ app.width(), app.height() });
         ImGui::Begin("app", nullptr, flags);
@@ -208,9 +206,7 @@ int main(int argc, char * argv[]) try
         depth_image.render(depth, { app.width() * 0.25f, app.height() * 0.25f, app.width() * 0.5f, app.height() * 0.75f  });
     }
     // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     return EXIT_SUCCESS;
 }
 catch (const rs2::error & e)

third-party/imgui/realsense_imgui.cpp

@@ -1,8 +1,10 @@
 /* License: Apache 2.0. See LICENSE file in root directory. */
 /* Copyright(c) 2024 Intel Corporation. All Rights Reserved. */
 
-//Overloading imgui functions to accommodate realsense GUI
+//Overloading and adding on imgui functions to accommodate realsense GUI
 #include "realsense_imgui.h"
+#include "imgui_impl_glfw.h"
+#include <imgui_impl_opengl3.h>
 
 bool ImGui::SliderIntWithSteps(const char* label, int* v, int v_min, int v_max, int v_step)
 {
@@ -69,7 +71,7 @@ bool Items_SingleStringGetter(void* data, int idx, const char** out_text)
     return true;
 }
 
-IMGUI_API bool ImGui::CustomComboBox(const char* label, int* current_item, const char* const items[], int items_count)
+bool ImGui::CustomComboBox(const char* label, int* current_item, const char* const items[], int items_count)
 {
     bool value_changed = false;
 
@@ -116,7 +118,7 @@ IMGUI_API bool ImGui::CustomComboBox(const char* label, int* current_item, const
     return value_changed;
 }
 
-IMGUI_API bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags, bool render_bg)
+bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags, bool render_bg)
 {
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
@@ -358,3 +360,19 @@ bool ImGui::SliderIntTofloat(const char* label, int* v, int v_min, int v_max, co
     *v = (int)v_f;
     return value_changed;
 }
+
+void ImGui::PushNewFrame()
+{
+    // Start the Dear ImGui frame
+    ImGui_ImplOpenGL3_NewFrame();
+    ImGui_ImplGlfw_NewFrame();
+    ImGui::NewFrame();
+}
+
+void ImGui::PopNewFrame()
+{
+    // Cleanup
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplGlfw_Shutdown();
+    ImGui::DestroyContext();
+}

third-party/imgui/realsense_imgui.h

@@ -32,6 +32,8 @@ namespace ImGui
     IMGUI_API bool          SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags, bool render_bg);
     IMGUI_API bool          VSliderFloat(const char* label, const ImVec2& size, float* v, float v_min, float v_max, const char* display_format, float power, bool render_bg);
     IMGUI_API bool          SliderIntTofloat(const char* label, int* v, int v_min, int v_max, const char* display_format = "%.0f");
+    IMGUI_API void          PushNewFrame();
+    IMGUI_API void          PopNewFrame();
 
 }
 #define CONCAT_(x,y) x##y

tools/realsense-viewer/realsense-viewer.cpp

@@ -662,8 +662,6 @@ int main(int argc, const char** argv) try
                 }
             }
 
-            ImGui::SetNextWindowContentSize(ImVec2(windows_width, 0.0f));
-
             auto pos = ImGui::GetCursorScreenPos();
             auto h = ImGui::GetWindowHeight();
             if (h > pos.y - viewer_model.panel_y)

tools/rosbag-inspector/rs-rosbag-inspector.cpp

@@ -27,6 +27,7 @@
 #include <imgui_impl_glfw.h>
 #include "imgui_impl_opengl3.h"
 #include <imgui_internal.h>
+#include <realsense_imgui.h>
 #ifdef _MSC_VER
 #ifndef NOMINMAX
 #define NOMINMAX
@@ -69,9 +70,7 @@ class gui_window
         glfwGetWindowSize(_window, &_w, &_h);
         glMatrixMode(GL_PROJECTION);
         glLoadIdentity();
-        ImGui_ImplOpenGL3_NewFrame();
-        ImGui_ImplGlfw_NewFrame();
-        ImGui::NewFrame();
+        ImGui::PushNewFrame();
         _first_frame = false;
         return res;
     }
@@ -442,9 +441,7 @@ int main(int argc, const char** argv) try
         std::this_thread::sleep_for(std::chrono::milliseconds(10));
     }
     // Cleanup
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplGlfw_Shutdown();
-    ImGui::DestroyContext();
+    ImGui::PopNewFrame();
     glfwTerminate();
     return 0;
 }