Better serialization of application state.

src/main.cc

@@ -15,10 +15,11 @@
 #define GLFW_INCLUDE_NONE
 #include <iostream>
 
+#include "3rdparty/json/json.hpp"
 #include "Camera.h"
+#include "GLFW/glfw3.h"
 #include "SkinnedMesh.h"
 #include "src/AnimGraph/AnimGraphEditor.h"
-#include "GLFW/glfw3.h"
 
 const int Width = 1024;
 const int Height = 768;
@@ -26,11 +27,6 @@ const int MaxVertices = (1 << 16);
 const int MaxIndices = MaxVertices * 3;
 
 uint64_t last_time = 0;
-bool show_imgui_demo_window = false;
-bool show_another_window = false;
-bool show_graph_editor = false;
-bool show_camera_dialog = false;
-bool show_skinned_mesh_dialog = false;
 
 sg_pass_action pass_action;
 sg_pipeline pip;
@@ -49,6 +45,7 @@ static void draw_imgui(ImDrawData*);
 
 // ozz-animation headers
 #include <cmath>  // fmodf
+#include <fstream>
 #include <memory>  // std::unique_ptr, std::make_unique
 
 #include "SkinnedMeshRenderer.h"
@@ -105,13 +102,92 @@ typedef struct {
 
 GuiInputState gGuiInputState = {0, 0, 0, 0, 0, 0, 0};
 
-enum class ControlMode {
+enum class ControlMode { ControlModeNone, ControlModeFPS };
-  ControlModeNone,
-  ControlModeFPS
-};
 
 ControlMode gControlMode = ControlMode::ControlModeNone;
 
+struct ApplicationConfig {
+  int window_position[2] = {100, 30};
+  int window_size[2] = {1000, 600};
+
+  struct GraphEditor {
+    bool visible = false;
+    int position[2] = {20, 20};
+    int size[2] = {800, 500};
+  };
+
+  GraphEditor graph_editor;
+
+  bool show_imgui_demo_window = false;
+  bool show_another_window = false;
+  bool show_camera_widget = false;
+  bool show_skinned_mesh_widget = false;
+};
+
+void to_json(nlohmann::json& j, const ApplicationConfig& config) {
+  std::cerr << "converting to json" << std::endl;
+  j["type"] = "AnimTestbedConfig";
+
+  j["main_window"]["position"][0] = config.window_position[0];
+  j["main_window"]["position"][1] = config.window_position[1];
+
+  j["main_window"]["size"][0] = config.window_size[0];
+  j["main_window"]["size"][1] = config.window_size[1];
+
+  j["graph_editor"]["visible"] = config.graph_editor.visible;
+  j["graph_editor"]["position"][0] = config.graph_editor.position[0];
+  j["graph_editor"]["position"][1] = config.graph_editor.position[1];
+  j["graph_editor"]["size"][0] = config.graph_editor.size[0];
+  j["graph_editor"]["size"][1] = config.graph_editor.size[1];
+
+  j["skinned_mesh_widget"]["visible"] = config.show_skinned_mesh_widget;
+  j["camera_widget"]["visible"] = config.show_camera_widget;
+}
+
+void from_json(const nlohmann::json& j, ApplicationConfig& config) {
+  std::cerr << "converting from json" << std::endl;
+
+  if (j.contains("main_window")) {
+    if (j["main_window"].contains("position")
+        and j["main_window"]["position"].size() == 2) {
+      config.window_position[0] = j["main_window"]["position"].at(0);
+      config.window_position[1] = j["main_window"]["position"].at(1);
+    }
+
+    if (j["main_window"].contains("size")
+        and j["main_window"]["size"].size() == 2) {
+      config.window_size[0] = j["main_window"]["size"].at(0);
+      config.window_size[1] = j["main_window"]["size"].at(1);
+    }
+  }
+
+  if (j.contains("graph_editor")) {
+    if (j["graph_editor"].contains("visible")) {
+      config.graph_editor.visible = j["graph_editor"]["visible"];
+    }
+
+    if (j["graph_editor"].contains("position") and j["graph_editor"]["position"].size() == 2) {
+      config.graph_editor.position[0] = j["graph_editor"]["position"].at(0);
+      config.graph_editor.position[1] = j["graph_editor"]["position"].at(1);
+    }
+
+    if (j["graph_editor"].contains("size") and j["graph_editor"]["size"].size() == 2) {
+      config.graph_editor.size[0] = j["graph_editor"]["size"].at(0);
+      config.graph_editor.size[1] = j["graph_editor"]["size"].at(1);
+    }
+  }
+
+  if (j.contains("skinned_mesh_widget") and j["skinned_mesh_widget"].contains("visible")) {
+    config.show_skinned_mesh_widget = j["skinned_mesh_widget"]["visible"];
+  }
+
+  if (j.contains("camera_widget") and j["camera_widget"].contains("visible")) {
+    config.show_camera_widget = j["camera_widget"]["visible"];
+  }
+}
+
+ApplicationConfig gApplicationConfig;
+
 // io buffers for skeleton and animation data files, we know the max file size upfront
 static uint8_t skel_data_buffer[4 * 1024];
 static uint8_t anim_data_buffer[32 * 1024];
@@ -145,6 +221,41 @@ void handle_mouse(GLFWwindow* w, GuiInputState* io_input_state) {
                                 + (glfwGetMouseButton(w, 2) << 2);
 }
 
+void load_application_config(const char* filename) {
+  if (std::filesystem::exists(filename)) {
+    std::ifstream input_file;
+    input_file.open(filename);
+    std::stringstream buffer;
+    buffer << input_file.rdbuf();
+    nlohmann::json application_config =
+        nlohmann::json::parse(buffer.str(), nullptr, false);
+
+    if (application_config.is_discarded()) {
+      std::cerr << "Error parsing json of file '" << filename << "'."
+                << std::endl;
+    }
+
+    if (application_config.value("type", "undefined") != "AnimTestbedConfig") {
+      std::cerr
+          << "Invalid json object. Expected type 'AnimTestbedConfig' but got '"
+          << application_config["type"] << "'." << std::endl;
+      application_config["type"] = "AnimTestbedConfig";
+    }
+
+    gApplicationConfig = application_config.get<ApplicationConfig>();
+  }
+}
+
+void save_application_config(const char* filename) {
+  std::ofstream output_file;
+
+  nlohmann::json application_config = gApplicationConfig;
+
+  output_file.open(filename);
+  output_file << to_string(application_config) << std::endl;
+  output_file.close();
+}
+
 int main() {
   // window and GL context via GLFW and flextGL
   glfwInit();
@@ -158,6 +269,23 @@ int main() {
   glfwMakeContextCurrent(w);
   glfwSwapInterval(1);
 
+  load_application_config("animtestbed_config.json");
+  if (gApplicationConfig.window_position[0] != 0
+      || gApplicationConfig.window_position[1] != 0) {
+    glfwSetWindowPos(
+        w,
+        gApplicationConfig.window_position[0],
+        gApplicationConfig.window_position[1]);
+  }
+
+  if (gApplicationConfig.window_size[0] != 0
+      || gApplicationConfig.window_size[1] != 0) {
+    glfwSetWindowSize(
+        w,
+        gApplicationConfig.window_size[0],
+        gApplicationConfig.window_size[1]);
+  }
+
   // GLFW to ImGui input forwarding
   glfwSetMouseButtonCallback(
       w,
@@ -206,32 +334,50 @@ int main() {
 
   int anim_idx = 0;
   float idle_markers[] = {0.f, 0.5};
-  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(skinned_mesh.m_animations[anim_idx]->duration(), 2, idle_markers);
+  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(
+      skinned_mesh.m_animations[anim_idx]->duration(),
+      2,
+      idle_markers);
 
   anim_idx = 1;
   skinned_mesh.LoadAnimation("../media/Walking-loop.ozz");
   float walking_markers[] = {0.293, 0.762};
-  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(skinned_mesh.m_animations[anim_idx]->duration(), 2, walking_markers);
+  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(
+      skinned_mesh.m_animations[anim_idx]->duration(),
+      2,
+      walking_markers);
 
   anim_idx = 2;
   skinned_mesh.LoadAnimation("../media/RunningSlow-loop.ozz");
   float running_slow_markers[] = {0.315, 0.834};
-  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(skinned_mesh.m_animations[anim_idx]->duration(), 2, running_slow_markers);
+  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(
+      skinned_mesh.m_animations[anim_idx]->duration(),
+      2,
+      running_slow_markers);
 
   anim_idx = 3;
   skinned_mesh.LoadAnimation("../media/RunningFast-loop.ozz");
   float running_fast_markers[] = {0.403, 0.818};
-  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(skinned_mesh.m_animations[anim_idx]->duration(), 2, running_fast_markers);
+  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(
+      skinned_mesh.m_animations[anim_idx]->duration(),
+      2,
+      running_fast_markers);
 
   anim_idx = 4;
   skinned_mesh.LoadAnimation("../media/Limping-loop.ozz");
   float limping_markers[] = {0.757, 0.044};
-  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(skinned_mesh.m_animations[anim_idx]->duration(), 2, limping_markers);
+  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(
+      skinned_mesh.m_animations[anim_idx]->duration(),
+      2,
+      limping_markers);
 
   anim_idx = 5;
   skinned_mesh.LoadAnimation("../media/ZombieWalk-loop.ozz");
   float zombiewalk_markers[] = {0.619, 0.};
-  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(skinned_mesh.m_animations[anim_idx]->duration(), 2, zombiewalk_markers);
+  skinned_mesh.m_animation_sync_track[anim_idx] = SyncTrack::CreateFromMarkers(
+      skinned_mesh.m_animations[anim_idx]->duration(),
+      2,
+      zombiewalk_markers);
 
   skinned_mesh.SetCurrentAnimation(0);
 
@@ -346,6 +492,16 @@ int main() {
 
   // draw loop
   while (!glfwWindowShouldClose(w)) {
+    glfwGetWindowPos(
+        w,
+        &gApplicationConfig.window_position[0],
+        &gApplicationConfig.window_position[1]);
+
+    glfwGetWindowSize(
+        w,
+        &gApplicationConfig.window_size[0],
+        &gApplicationConfig.window_size[1]);
+
     state.time.frame = stm_sec(
         stm_round_to_common_refresh_rate(stm_laptime(&state.time.laptime)));
 
@@ -361,7 +517,7 @@ int main() {
     ImGui::NewFrame();
 
     // handle input
-    handle_mouse (w, &gGuiInputState);
+    handle_mouse(w, &gGuiInputState);
 
     if (glfwGetMouseButton(w, GLFW_MOUSE_BUTTON_RIGHT)) {
       if (gControlMode == ControlMode::ControlModeNone) {
@@ -422,21 +578,25 @@ int main() {
     }
 
     if (ImGui::BeginMainMenuBar()) {
-      if (ImGui::BeginMenu("File"))
+      if (ImGui::BeginMenu("File")) {
-      {
         if (ImGui::MenuItem("Quit")) {
           glfwSetWindowShouldClose(w, true);
         }
         ImGui::EndMenu();
       }
 
-      if (ImGui::BeginMenu("View"))
+      if (ImGui::BeginMenu("View")) {
-      {
+        ImGui::Checkbox("Graph Editor", &gApplicationConfig.graph_editor.visible);
-        ImGui::Checkbox("Graph Editor", &show_graph_editor);
+        ImGui::Checkbox(
-        ImGui::Checkbox("Camera Settings", &show_camera_dialog);
+            "Camera Settings",
-        ImGui::Checkbox("Skinned Mesh", &show_skinned_mesh_dialog);
+            &gApplicationConfig.show_camera_widget);
+        ImGui::Checkbox(
+            "Skinned Mesh",
+            &gApplicationConfig.show_skinned_mesh_widget);
         ImGui::Separator();
-        ImGui::Checkbox("ImGui Demo", &show_imgui_demo_window);
+        ImGui::Checkbox(
+            "ImGui Demo",
+            &gApplicationConfig.show_imgui_demo_window);
 
         ImGui::EndMenu();
       }
@@ -446,11 +606,11 @@ int main() {
 
     // Animation Runtime
     {
-      if (show_camera_dialog) {
+      if (gApplicationConfig.show_camera_widget) {
         ImGui::SetNextWindowPos(ImVec2(600, 30), ImGuiCond_FirstUseEver);
         ImGui::SetNextWindowSize(ImVec2(300, 170), ImGuiCond_FirstUseEver);
 
-        ImGui::Begin("Camera", &show_camera_dialog);
+        ImGui::Begin("Camera", &gApplicationConfig.show_camera_widget);
         ImGui::SliderFloat3("pos", state.camera.pos, -100.f, 100.f);
         ImGui::SliderFloat("near", &state.camera.near, 0.001f, 10.f);
         ImGui::SliderFloat("far", &state.camera.far, 1.0f, 10000.f);
@@ -464,7 +624,7 @@ int main() {
 
       draw_grid();
 
-      if (show_skinned_mesh_dialog) {
+      if (gApplicationConfig.show_skinned_mesh_widget) {
         skinned_mesh.DrawDebugUi();
       }
 
@@ -480,21 +640,30 @@ int main() {
     }
 
     // Animation Graph Editor
-    if (show_graph_editor) {
+    if (gApplicationConfig.graph_editor.visible) {
-      ImGui::SetNextWindowPos(ImVec2(20, 20), ImGuiCond_FirstUseEver);
+      ImGui::SetNextWindowPos(ImVec2(gApplicationConfig.graph_editor.position[0], gApplicationConfig.graph_editor.position[1]), ImGuiCond_FirstUseEver);
-      ImGui::SetNextWindowSize(ImVec2(500, 400), ImGuiCond_FirstUseEver);
+      ImGui::SetNextWindowSize(ImVec2(gApplicationConfig.graph_editor.size[0], gApplicationConfig.graph_editor.size[1]), ImGuiCond_FirstUseEver);
 
       ImGui::Begin(
           "Graph Editor",
-          &show_graph_editor,
+          &gApplicationConfig.graph_editor.visible,
           ImGuiWindowFlags_MenuBar);
+
+      ImVec2 graph_editor_position = ImGui::GetWindowPos();
+      gApplicationConfig.graph_editor.position[0] = graph_editor_position.x;
+      gApplicationConfig.graph_editor.position[1] = graph_editor_position.y;
+
+      ImVec2 graph_editor_size = ImGui::GetWindowSize();
+      gApplicationConfig.graph_editor.size[0] = graph_editor_size.x;
+      gApplicationConfig.graph_editor.size[1] = graph_editor_size.y;
+
       AnimGraphEditorUpdate();
+
       ImGui::End();
     }
 
-
     // 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowDemoWindow()
-    if (show_imgui_demo_window) {
+    if (gApplicationConfig.show_imgui_demo_window) {
       ImGui::SetNextWindowPos(ImVec2(460, 20), ImGuiCond_FirstUseEver);
       ImGui::ShowDemoWindow();
     }
@@ -510,6 +679,8 @@ int main() {
     glfwPollEvents();
   }
 
+  save_application_config("animtestbed_config.json");
+
   /* cleanup */
   ImNodes::DestroyContext();
   ImGui::DestroyContext();
@@ -609,7 +780,6 @@ static void draw_line(
   draw_vec(v1);
 }
 
-
 static void draw_grid(void) {
   sgl_defaults();
   sgl_matrix_mode_projection();
@@ -625,20 +795,24 @@ static void draw_grid(void) {
     if (i == 0) {
       continue;
     }
-    ozz::math::SimdFloat4 p0 = ozz::math::simd_float4::Load(i * 1.0f, 0.f, -grid_size * 1.0f, 1.f);
+    ozz::math::SimdFloat4 p0 =
-    ozz::math::SimdFloat4 p1 = ozz::math::simd_float4::Load(i * 1.0f, 0.f, grid_size * 1.0f, 1.f);
+        ozz::math::simd_float4::Load(i * 1.0f, 0.f, -grid_size * 1.0f, 1.f);
+    ozz::math::SimdFloat4 p1 =
+        ozz::math::simd_float4::Load(i * 1.0f, 0.f, grid_size * 1.0f, 1.f);
     draw_line(p0, p1);
 
     p0 = ozz::math::simd_float4::Load(-grid_size * 1.0f, 0.f, i * 1.0f, 1.f);
     p1 = ozz::math::simd_float4::Load(grid_size * 1.0f, 0.f, i * 1.0f, 1.f);
     draw_line(p0, p1);
   }
-  sgl_c3f (0.7f, 0.4f, 0.2f);
+  sgl_c3f(0.7f, 0.4f, 0.2f);
-  ozz::math::SimdFloat4 p0 = ozz::math::simd_float4::Load(0, 0.f, -grid_size * 1.0f, 1.f);
+  ozz::math::SimdFloat4 p0 =
-  ozz::math::SimdFloat4 p1 = ozz::math::simd_float4::Load(0, 0.f, grid_size * 1.0f, 1.f);
+      ozz::math::simd_float4::Load(0, 0.f, -grid_size * 1.0f, 1.f);
+  ozz::math::SimdFloat4 p1 =
+      ozz::math::simd_float4::Load(0, 0.f, grid_size * 1.0f, 1.f);
   draw_line(p0, p1);
 
-  sgl_c3f (0.2f, 0.4f, 0.7f);
+  sgl_c3f(0.2f, 0.4f, 0.7f);
   p0 = ozz::math::simd_float4::Load(-grid_size * 1.0f, 0.f, 0.f, 1.f);
   p1 = ozz::math::simd_float4::Load(grid_size * 1.0f, 0.f, 0.f, 1.f);
   draw_line(p0, p1);
@@ -646,7 +820,6 @@ static void draw_grid(void) {
   sgl_end();
 }
 
-
 // draw ImGui draw lists via sokol-gfx
 void draw_imgui(ImDrawData* draw_data) {
   assert(draw_data);