skinning.vert

#version 330 core

const int MAX_JOINTS = 120;

layout(location = 0) in vec3 vVertex;	// object space vertex position
layout(location = 1) in vec4 vColor;	// per-vertex colour
//layout(location = 2) in vec4 vNormal;	// per-vertex normals
layout(location = 3) in vec2 vTexcoord;	// per-vertex texcoord
layout(location = 4) in vec4 weights;	// per-vertex weights
layout(location = 5) in ivec4 joints;	// per-vertex joints

//output from the vertex shader
smooth out vec4 vSmoothColor;		// smooth colour to fragment shader
smooth out vec2 vSmoothTexcoord;

//uniform
uniform mat4 MVP;	// combined modelview projection matrix
uniform vec4 colorTint;
uniform mat4 animatedMatrices[MAX_JOINTS];

void main()
{
    // calculate skinning matrix
    mat4 skin = animatedMatrices[joints.x] * weights.x;
        skin += animatedMatrices[joints.y] * weights.y;
        skin += animatedMatrices[joints.z] * weights.z;
        skin += animatedMatrices[joints.w] * weights.w;

    /*mat4 skin = mat4(1.0f);

    if (gl_VertexID < MAX_JOINTS)
    {
        mat4 skin = animatedMatrices[gl_VertexID];
    }*/

    // assign the per-vertex colour to vSmoothColor varying
    vSmoothColor = vec4(vColor) * colorTint;
    vSmoothTexcoord = vTexcoord;

    // get the clip space position by multiplying the combined MVP matrix with the object space
    // vertex position
    gl_Position = MVP * skin * vec4(vVertex, 1.0);

    // vNormal = vec4(model * skin * normal);
}