uniform samplerBuffer skinning_tex;

layout(location = 0) in vec3 i_position;

#if defined(Converts_10bit_Vector)
layout(location = 1) in vec4 i_normal_orig;
#else
layout(location = 1) in vec4 i_normal;
#endif

#if defined(Converts_10bit_Vector)
layout(location = 5) in vec4 i_tangent_orig;
#else
layout(location = 5) in vec4 i_tangent;
#endif

layout(location = 6) in ivec4 i_joint;
layout(location = 7) in vec4 i_weight;
layout(location = 8) in vec3 i_origin;

#if defined(Converts_10bit_Vector)
layout(location = 9) in vec4 i_rotation_orig;
#else
layout(location = 9) in vec4 i_rotation;
#endif

layout(location = 10) in vec4 i_scale;
layout(location = 12) in ivec2 i_misc_data;

#stk_include "utils/get_world_location.vert"

out vec3 o_tangent;
out vec3 o_bitangent;
out vec3 o_normal;

void main()
{

#if defined(Converts_10bit_Vector)
    vec4 i_normal = convert10BitVector(i_normal_orig);
    vec4 i_tangent = convert10BitVector(i_tangent_orig);
    vec4 i_rotation = convert10BitVector(i_rotation_orig);
#endif

    vec4 idle_position = vec4(i_position, 1.0);
    vec4 idle_normal = vec4(i_normal.xyz, 0.0);
    vec4 idle_tangent = vec4(i_tangent.xyz, 0.0);
    vec4 skinned_position = vec4(0.0);
    vec4 skinned_normal = vec4(0.0);
    vec4 skinned_tangent = vec4(0.0);
    int skinning_offset = i_misc_data.x;

    for (int i = 0; i < 4; i++)
    {
        mat4 joint_matrix = mat4(
            texelFetch(skinning_tex,
                clamp(i_joint[i] + skinning_offset, 0, MAX_BONES) * 4),
            texelFetch(skinning_tex,
                clamp(i_joint[i] + skinning_offset, 0, MAX_BONES) * 4 + 1),
            texelFetch(skinning_tex,
                clamp(i_joint[i] + skinning_offset, 0, MAX_BONES) * 4 + 2),
            texelFetch(skinning_tex,
                clamp(i_joint[i] + skinning_offset, 0, MAX_BONES) * 4 + 3));
        skinned_position += i_weight[i] * joint_matrix * idle_position;
        skinned_normal += i_weight[i] * joint_matrix * idle_normal;
        skinned_tangent += i_weight[i] * joint_matrix * idle_tangent;
    }

    float step_mix = step(float(skinning_offset), 0.0);
    skinned_position = mix(skinned_position, idle_position, step_mix);
    skinned_normal = mix(skinned_normal, idle_normal, step_mix);
    skinned_tangent = mix(skinned_tangent, idle_tangent, step_mix);
    vec4 quaternion = normalize(vec4(i_rotation.xyz, i_scale.w));

    gl_Position = getWorldPosition(i_origin, quaternion, i_scale.xyz,
        skinned_position.xyz);
    o_normal = normalize(rotateVector(quaternion, skinned_normal.xyz));
    o_tangent = normalize(rotateVector(quaternion, skinned_tangent.xyz));
    o_bitangent = cross(o_normal, o_tangent) * i_tangent.w;

}