#version 430

//bones
uniform mat4 ProjectionMatrix;
uniform mat4 CameraMatrix;
uniform mat4 ModelMatrix;

uniform mat4 Bones[64];
uniform bool skeletal_animation;

layout(location = 0) in vec3 vertex;
layout(location = 1) in vec2 uvs;
//layout(location = 2) in vec3 normal;
layout(location = 3) in ivec4 boneIndices;
layout(location = 4) in vec4 vertexWeights;

out vec2 fsUvs;

const int NUM_INFLUENCE_BONES = 4;

void main()
{
	fsUvs = uvs;

	vec4 final = vec4(0);

	if(skeletal_animation && vertexWeights[0] + vertexWeights[1] + vertexWeights[2] + vertexWeights[3] > 0.5)
		for(int i = 0; i < NUM_INFLUENCE_BONES; i++)
		{
			vec4 v = Bones[boneIndices[i]] * vec4(vertex, 1.0) * vertexWeights[i];

			final += v;
		}
	else
		final = vec4(vertex,1.0);

	gl_Position = ProjectionMatrix * CameraMatrix * ModelMatrix * final;
}