Added graph design ramblings.

3rdparty/ozz-animation/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.3)
+cmake_minimum_required (VERSION 3.20)
 
 # Defines the project's name
 project(ozz)

3rdparty/ozz-animation/include/ozz/base/containers/std_allocator.h

@@ -49,7 +49,7 @@ class StdAllocator {
   StdAllocator(const StdAllocator&) noexcept {}
 
   template <class _Other>
-  StdAllocator<value_type>(const StdAllocator<_Other>&) noexcept {}
+  StdAllocator(const StdAllocator<_Other>&) noexcept {}
 
   template <class _Other>
   struct rebind {

doc/design.md

@@ -0,0 +1,35 @@
+## Graph
+
+### 1. Support of math nodes (or non-AnimNodes in general)
+
+* Enables animators to add custom math for blend inputs or to adjust other inputs (e.g. LookAt or IK
+  targets).
+
+**Open Issues**
+
+1. When to do the evaluation? Two types of subgraphs:
+   a) Instant inputs (needed for blend node inputs) that have to be evaluated before
+   UpdateConnections
+   b) Processing nodes, e.g. for extracted bones.
+
+### 2. Support of multiple output sockets
+
+* E.g. extract Bone transform
+
+* Increases Node complexity:
+    * AnimOutput
+    * AnimOutput + Data
+    * Data
+
+(Data = bool, float, vec3, quat, ...)
+
+**Open Issues**
+
+1. Unclear when this is actually needed. Using more specific nodes that perform the desired logic
+   may be better (
+   c.f. https://dev.epicgames.com/documentation/en-us/unreal-engine/animation-blueprint-bone-driven-controller-in-unreal-engine).
+   Likely this is not crucial so should be avoided for now.
+
+### 3. Multi-skeleton evaluation
+
+Use case: riding on a horse, interaction between two characters.

src/AnimNodes/SpeedScaleNode.cc

@@ -14,7 +14,11 @@ void SpeedScaleNode::DrawDebugUi() {
 
   // ensure m_time_scale is positive
   m_time_scale = m_time_scale * (is_negative ? -1.f : 1.f);
-  ImGui::SliderFloat("Time Scale", &m_time_scale, 0.01f, 5.f);
+  if (ImGui::SliderFloat("Time Scale", &m_time_scale, 0.01f, 2.f)) {
+    if (fabs(m_time_scale - 1.0) < 0.2) {
+      m_time_scale = 1.0;
+    }
+  }
   // and back to the original negative or positive sign
   m_time_scale = m_time_scale * (is_negative ? -1.f : 1.f);
 }

src/AnimationController.cc

@@ -35,14 +35,14 @@ AnimationController::AnimationController(SkinnedMesh* skinned_mesh)
   sampler_node1->SetAnimation(skinned_mesh->m_animations[2], skinned_mesh->m_animation_sync_track[2]);
   m_anim_nodes.push_back(sampler_node1);
 
-//  SpeedScaleNode* speed_node = new SpeedScaleNode(this);
-//  speed_node->m_name = "SpeedNode0";
-//  speed_node->m_input_node = sampler_node0;
-//  m_anim_nodes.push_back(speed_node);
+  SpeedScaleNode* speed_node = new SpeedScaleNode(this);
+  speed_node->m_name = "SpeedNode0";
+  speed_node->m_input_node = sampler_node0;
+  m_anim_nodes.push_back(speed_node);
 
   BlendNode* blend_node = new BlendNode(this);
   blend_node->m_name = "Blend0";
-  blend_node->m_input_A = sampler_node0;
+  blend_node->m_input_A = speed_node;
   blend_node->m_input_B = sampler_node1;
   blend_node->m_sync_inputs = true;
   m_anim_nodes.push_back(blend_node);

src/Camera.c

@@ -42,8 +42,8 @@ inline void Camera_Init(Camera* camera) {
   camera->pitch = 10 * M_PI / 180.0f;
 
   memcpy(&camera->mtxView, &mtx_identity, sizeof(camera->mtxView));
-  Camera_CalcToMatrix(camera, &camera->mtxView);
-  Camera_CalcFromMatrix(camera, &camera->mtxView);
+  Camera_CalcToMatrix(camera, &camera->mtxView[0]);
+  Camera_CalcFromMatrix(camera, &camera->mtxView[0]);
 }
 
 void Camera_CalcFromMatrix(Camera* camera, float* mat) {
@@ -153,6 +153,6 @@ inline void Camera_Update(
       camera->vel[i] = camera->vel[i] * 0.1;
     }
 
-    Camera_CalcToMatrix(camera, &camera->mtxView);
+    Camera_CalcToMatrix(camera, &camera->mtxView[0]);
   }
-}
+}

src/main.cc

@@ -17,9 +17,10 @@
 #include "Camera.h"
 #include "SkinnedMesh.h"
 #include "GLFW/glfw3.h"
+#include "embedded_fonts.h"
 
-const int Width = 1024;
-const int Height = 768;
+const int Width = 2420;
+const int Height = 1480;
 const int MaxVertices = (1 << 16);
 const int MaxIndices = MaxVertices * 3;
 
@@ -233,7 +234,6 @@ int main() {
 
   AnimationController animation_controller (&skinned_mesh);
 
-//  state.ozz = std::make_unique<ozz_t>();
   state.time.factor = 1.0f;
 
   Camera_Init(&state.camera);
@@ -242,8 +242,24 @@ int main() {
   ImGui::CreateContext();
   ImGui::StyleColorsDark();
   ImGuiIO& io = ImGui::GetIO();
-  io.IniFilename = nullptr;
-  io.Fonts->AddFontDefault();
+  io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+  io.IniFilename = "ATPImgui.ini";
+
+  ImGui::GetStyle().ScaleAllSizes(2.0);
+
+  //io.Fonts->AddFontDefault();
+  ImFontConfig font_config;
+  font_config.OversampleH = 4;
+  font_config.OversampleV = 4;
+  font_config.GlyphExtraSpacing.x = 1.0f;
+  io.Fonts->AddFontFromMemoryCompressedTTF(
+      //      roboto_medium_ttf_compressed_data,
+      //      roboto_medium_ttf_compressed_size,
+      droid_sans_ttf_compressed_data,
+      droid_sans_ttf_compressed_size,
+      28,
+      &font_config);
+
   io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;
   io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT;
   io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT;