// tessellation control shader
#version 450 core

// specify number of control points per patch output
// this value controls the size of the input and output arrays
layout (vertices=4) out;

layout (location=0) in VS_OUT
{
	vec2 vsUV;
	vec4 vsWorldPos;
	vec3 vsNormal;
	vec3 vsBiTangent;
	vec3 vsTangent;
	mat3 vsTBN;
	flat uint vsChunkID;
	flat uint vsMaterialID;
}tc_in[];

layout (location=0) out TC_OUT
{
	vec2 vsUV;
	vec4 vsWorldPos;
	vec3 vsNormal;
	vec3 vsBiTangent;
	vec3 vsTangent;
	mat3 vsTBN;
	flat uint vsChunkID;
	flat uint vsMaterialID;
}tc_out[];


void main()
{
    // ----------------------------------------------------------------------
    // pass attributes through
    gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
    tc_out[gl_InvocationID].vsUV = tc_in[gl_InvocationID].vsUV;
    tc_out[gl_InvocationID].vsWorldPos = tc_in[gl_InvocationID].vsWorldPos;
    tc_out[gl_InvocationID].vsNormal = tc_in[gl_InvocationID].vsNormal;
    tc_out[gl_InvocationID].vsBiTangent = tc_in[gl_InvocationID].vsBiTangent;
    tc_out[gl_InvocationID].vsTangent = tc_in[gl_InvocationID].vsTangent;
    tc_out[gl_InvocationID].vsTBN = tc_in[gl_InvocationID].vsTBN;
    tc_out[gl_InvocationID].vsChunkID = tc_in[gl_InvocationID].vsChunkID;
    tc_out[gl_InvocationID].vsMaterialID = tc_in[gl_InvocationID].vsMaterialID;
	
    // ----------------------------------------------------------------------
    // invocation zero controls tessellation levels for the entire patch
    if (gl_InvocationID == 0)
    {
        
        int divs = 63;
        gl_TessLevelOuter[0] = divs;
        gl_TessLevelOuter[1] = divs;
        gl_TessLevelOuter[2] = divs;
        gl_TessLevelOuter[3] = divs;
        gl_TessLevelInner[0] = divs;
        gl_TessLevelInner[1] = divs;
    }
}