Initial integration of docking that saves layout and does not crash

3rdparty/imgui_docking_minimal/include/imgui_dock.h

@@ -2,7 +2,6 @@
 
 
 
-
 namespace ImGui
 {
 

CMakeLists.txt

@@ -64,6 +64,7 @@ INCLUDE_DIRECTORIES (
 	3rdparty/bgfx/3rdparty/glsl-optimizer/src/
 	3rdparty/bgfx/3rdparty/glsl-optimizer/src/mesa/
 	${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/imgui_docking_minimal/include
+	${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/bgfx/3rdparty/ocornut-imgui
 	${CMAKE_CURRENT_BINARY_DIR}/src
 	)
 
@@ -86,7 +87,7 @@ SET ( protot_SRCS
 	src/RuntimeModuleManager.cc
 
 	3rdparty/glfw/deps/glad.c
-	3rdparty/imgui_docking_minimal/imgui/imgui_dock.cpp
+	3rdparty/imgui_docking_minimal/src/imgui_dock.cpp
 	)
 
 SET (PROTOT_SOURCE_ROOT_PATH ${CMAKE_CURRENT_SOURCE_DIR})

src/main.cc

@@ -15,6 +15,7 @@
 #include "Timer.h"
 #include "RuntimeModuleManager.h"
 #include "imgui/imgui.h"
+#include "imgui_dock.h"
 
 #include "Globals.h"
 #include "Serializer.h"
@@ -143,6 +144,7 @@ int main(void)
 	imguiCreate();
 	GuiInputState gui_input_state;
 	gGuiInputState = &gui_input_state;
+	ImGui::LoadDock();
 
 	// Timer
 	Timer timer;
@@ -228,6 +230,9 @@ int main(void)
 
 	gRenderer = nullptr;
 
+  ImGui::SaveDock();
+	ImGui::ShutdownDock();
 	imguiDestroy();
+
 	bgfx::shutdown();
 }

src/modules/RenderModule.cc

@@ -2,7 +2,9 @@
 #include "Globals.h"
 #include "RenderModule.h"
 #include "3rdparty/ocornut-imgui/imgui.h"
+#include "3rdparty/ocornut-imgui/imgui_internal.h"
 #include "imgui/imgui.h"
+#include "imgui_dock.h"
 #define GLFW_EXPOSE_NATIVE_GLX
 #define GLFW_EXPOSE_NATIVE_X11
 #include <GLFW/glfw3.h>
@@ -43,6 +45,10 @@ typedef Vector3f Vector3f;
 typedef MatrixNNf MatrixNNf;
 typedef VectorNf VectorNf;
 
+static bool show_scene0 = true;
+static bool show_scene1 = true;
+static bool show_scene2 = true;
+
 struct Renderer;
 
 struct module_state {
@@ -128,7 +134,7 @@ static bool module_step(struct module_state *state, float dt) {
 	bgfx::reset (width, height);
 
 	int dock_top_offset = 0.0f;
-	int dock_width = 400;
+	int dock_width = 0;
 //	ImGui::RootDock(
 //			ImVec2(width - dock_width, dock_top_offset),
 //			ImVec2(dock_width, height - dock_top_offset)
@@ -139,6 +145,7 @@ static bool module_step(struct module_state *state, float dt) {
 	ImGuizmo::Enable(true);
 
 	state->renderer->paintGL();
+	state->renderer->DrawGui();
 
 	return true;
 }
@@ -1700,10 +1707,6 @@ void Renderer::paintGL() {
 		}
 	}
 
-	// Advance to next frame. Rendering thread will be kicked to
-	// process submitted rendering primitives.
-	bgfx::frame();
-
 //	if (ImGui::BeginDock("Render Settings")) {
 		if(ImGui::DragFloat3 ("Light0 Pos", lights[0].pos.data(), 1.0f, -10.0f, 10.0f)) {
 		}
@@ -1739,10 +1742,45 @@ void Renderer::paintGL() {
 
 //	ImGui::EndDock();
 
+	// Advance to next frame. Rendering thread will be kicked to
+	// process submitted rendering primitives.
+	bgfx::frame();
+
 	// clear debug commands as they have to be issued every frame
 	debugCommands.clear();
 }
 
+void Renderer::DrawGui() {
+   ImGuiStyle& style = ImGui::GetStyle();
+	if (ImGui::GetIO().DisplaySize.y > 0) {
+		ImVec2 pos = ImVec2(0, 25);
+		ImVec2 size = ImGui::GetIO().DisplaySize;
+		size.y -= pos.y;
+		ImGui::RootDock(pos, ImVec2(size.x, size.y - 25.0f));
+
+		// Draw status bar (no docking)
+		ImGui::SetNextWindowSize(ImVec2(size.x, 25.0f), ImGuiSetCond_Always);
+		ImGui::SetNextWindowPos(ImVec2(0, size.y - 32.0f), ImGuiSetCond_Always);
+		ImGui::Begin("statusbar", nullptr, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoResize);
+		ImGui::Text("FPS: %f", ImGui::GetIO().Framerate);
+		ImGui::End();
+	}
+
+	if (ImGui::BeginDock("Docks", &show_scene0))  {
+		ImGui::Print();
+	}
+	ImGui::EndDock();
+
+	if (ImGui::BeginDock("Dummy1", &show_scene1)) {
+		ImGui::Text("Placeholder!");
+	}
+	ImGui::EndDock();
+//	if (ImGui::BeginDock("Dummy2", &show_scene2)) {
+//		ImGui::Text("Placeholder2!");
+//	}
+//	ImGui::EndDock();
+}
+
 bool Renderer::updateShaders() {
 	bool result = true;
 	for (int i = 0; i < RenderState::Count; i++) {

src/modules/RenderModule.h

@@ -417,6 +417,7 @@ struct Renderer {
 	void initialize(int width, int height);
 	void shutdown();
 	void paintGL();
+	void DrawGui();
 	void resize (int x, int y, int width, int height);
 
 	// check whether shader files were modified and reload them. Returns