terravisor/shaders/tessellation_ctrl.glsl

#version 430

layout(vertices = 4) out;  // Define the number of control points per patch (e.g., 4 for a quad)

in VertexData {
    vec2 tex_coord;
} inData[];

out VertexData {
    vec2 tex_coord;
} outData[];

void main()
{
    // Pass through control points to the tessellation evaluation shader
    gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
    outData[gl_InvocationID].tex_coord = inData[gl_InvocationID].tex_coord;

    // Set the tessellation levels (outer and inner)
    if (gl_InvocationID == 0) {
        gl_TessLevelOuter[0] = 5.0; // Level of tessellation along one edge
        gl_TessLevelOuter[1] = 5.0; // Level of tessellation along another edge
        gl_TessLevelOuter[2] = 5.0; // Level of tessellation along the other edge
        gl_TessLevelOuter[3] = 5.0; // Level of tessellation along the other edge
        gl_TessLevelInner[0] = 5.0; // Level of tessellation for the inner part
        gl_TessLevelInner[1] = 5.0; // Level of tessellation for the inner part
    }
}