ToyEngine/Demo/Engine/Shaders/model_shadow.vert

#version 450 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
layout (location = 2) in vec2 aTexCoords;
layout (location = 3) in ivec4 boneIds; 
layout (location = 4) in vec4 weights;
 
out vec2 vTexCoords;
 
uniform mat4 model;

const int MAX_BONES = 100;
const int MAX_BONE_INFLUENCE = 4;
layout (std140, binding = 1) uniform FinalBonesMatrices
{
    mat4 finalBonesMatrices[MAX_BONES];
};

void main()
{
    vec4 totalPosition = vec4(0.0f);
	vec3 totalNormal = vec3(0);
	int boneCount = 0;
	for(int i = 0 ; i < MAX_BONE_INFLUENCE ; i++)
	{
		if(boneIds[i] == -1) 
			continue;
		if(boneIds[i] >= MAX_BONES) 
		{
			totalPosition = vec4(aPos,1.0f);
			break;
		}
		boneCount++;
		vec4 localPosition = finalBonesMatrices[boneIds[i]] * vec4(aPos,1.0f);
		totalPosition += localPosition * weights[i];
		vec3 localNormal = mat3(finalBonesMatrices[boneIds[i]]) * aNormal;
		totalNormal += localNormal * weights[i];
	}

	if(boneCount == 0)
	{
		totalPosition = vec4(aPos, 1);
		totalNormal = vec3(aNormal);
	}

    vTexCoords = aTexCoords;
    gl_Position = model * totalPosition;
}