Updated source code files of skeletal animation guest article.

includes/learnopengl/animation.h

@@ -33,7 +33,7 @@ public:
 		aiMatrix4x4 globalTransformation = scene->mRootNode->mTransformation;
 		globalTransformation = globalTransformation.Inverse();
 		ReadHeirarchyData(m_RootNode, scene->mRootNode);
-		SetupBones(animation, *model);
+		ReadMissingBones(animation, *model);
 	}
 
 	~Animation()
@@ -62,13 +62,14 @@ public:
 	}
 
 private:
-	void SetupBones(const aiAnimation* animation, Model& model)
+	void ReadMissingBones(const aiAnimation* animation, Model& model)
 	{
 		int size = animation->mNumChannels;
 
-		auto& boneInfoMap = model.GetOffsetMatMap();
+		auto& boneInfoMap = model.GetBoneInfoMap();//getting m_BoneInfoMap from Model class
-		int& boneCount = model.GetBoneCount();
+		int& boneCount = model.GetBoneCount(); //getting the m_BoneCounter from Model class
 
+		//reading channels(bones engaged in an animation and their keyframes)
 		for (int i = 0; i < size; i++)
 		{
 			auto channel = animation->mChannels[i];

includes/learnopengl/animator.h

@@ -11,13 +11,15 @@
 class Animator
 {
 public:
-	Animator::Animator(Animation* current)
+	Animator::Animator(Animation* animation)
 	{
-		m_CurrentAnimation = current;
 		m_CurrentTime = 0.0;
-		m_Transforms.reserve(100);
+		m_CurrentAnimation = animation;
+
+		m_FinalBoneMatrices.reserve(100);
+
 		for (int i = 0; i < 100; i++)
-			m_Transforms.push_back(glm::mat4(1.0f));
+			m_FinalBoneMatrices.push_back(glm::mat4(1.0f));
 	}
 
 	void Animator::UpdateAnimation(float dt)
@@ -57,20 +59,20 @@ public:
 		{
 			int index = boneInfoMap[nodeName].id;
 			glm::mat4 offset = boneInfoMap[nodeName].offset;
-			m_Transforms[index] = globalTransformation * offset;
+			m_FinalBoneMatrices[index] = globalTransformation * offset;
 		}
 
 		for (int i = 0; i < node->childrenCount; i++)
 			CalculateBoneTransform(&node->children[i], globalTransformation);
 	}
 
-	std::vector<glm::mat4> GetPoseTransforms() 
+	std::vector<glm::mat4> GetFinalBoneMatrices()
 	{
-		return m_Transforms;  
+		return m_FinalBoneMatrices;
 	}
 
 private:
-	std::vector<glm::mat4> m_Transforms;
+	std::vector<glm::mat4> m_FinalBoneMatrices;
 	Animation* m_CurrentAnimation;
 	float m_CurrentTime;
 	float m_DeltaTime;

includes/learnopengl/animdata.h

@@ -4,15 +4,10 @@
 
 struct BoneInfo
 {
-	/*
+	/*id is index in finalBoneMatrices*/
-		For uniquely indentifying the bone and
-		for indexing bone transformation in shaders
-	*/
 	int id;
-	/*
+
-		map from bone name to offset matrix.
+	/*offset matrix transforms vertex from model space to bone space*/
-		offset matrix transforms bone from bone space to local space
-	*/
 	glm::mat4 offset;
 
 };

src/8.guest/2020/skeletal_animation/anim_model.fs

@@ -0,0 +1,11 @@
+#version 430 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D texture_diffuse1;
+
+void main()
+{    
+    FragColor = texture(texture_diffuse1, TexCoords);
+}

src/8.guest/2020/skeletal_animation/anim_model.vs

@@ -0,0 +1,39 @@
+#version 430 core
+
+layout(location = 0) in vec3 pos;
+layout(location = 1) in vec3 norm;
+layout(location = 2) in vec2 tex;
+layout(location = 3) in ivec4 boneIds; 
+layout(location = 4) in vec4 weights;
+
+uniform mat4 projection;
+uniform mat4 view;
+uniform mat4 model;
+
+const int MAX_BONES = 100;
+const int MAX_BONE_INFLUENCE = 4;
+uniform mat4 finalBonesMatrices[MAX_BONES];
+
+out vec2 TexCoords;
+
+void main()
+{
+    vec4 totalPosition = vec4(0.0f);
+    for(int i = 0 ; i < MAX_BONE_INFLUENCE ; i++)
+    {
+        if(boneIds[i] == -1) 
+            continue;
+        if(boneIds[i] >=MAX_BONES) 
+        {
+            totalPosition = vec4(pos,1.0f);
+            break;
+        }
+        vec4 localPosition = finalBonesMatrices[boneIds[i]] * vec4(pos,1.0f);
+        totalPosition += localPosition * weights[i];
+        vec3 localNormal = mat3(finalBonesMatrices[boneIds[i]]) * norm;
+   }
+	
+    mat4 viewModel = view * model;
+    gl_Position =  projection * viewModel * totalPosition;
+	TexCoords = tex;
+}