terravisor/shaders/tessellation_ctrl.glsl

#version 450 core

layout(vertices = 4) out;

layout(binding = 0) uniform sampler2D heightTexture;
uniform float tessellationFactor;

layout(std140, binding = 4) uniform GeoUniforms
{
    mat4 PV;
    mat4 M;
    
    float minTessellation;
    float maxTessellation;
    float displacementScale;
    int gridDensity;
};

in VS_OUT {
    vec3 position;
    vec2 texCoord;
} tc_in[];

out TC_OUT {
    vec3 position;
    vec2 texCoord;
} tc_out[];

void main() {
    // Pass through position and texture coordinates to the tessellation evaluation shader
    tc_out[gl_InvocationID].position = tc_in[gl_InvocationID].position;
    tc_out[gl_InvocationID].texCoord = tc_in[gl_InvocationID].texCoord;

    // Set tessellation levels
    if (gl_InvocationID == 0) {
        gl_TessLevelOuter[0] = maxTessellation; 
        gl_TessLevelOuter[1] = maxTessellation; 
        gl_TessLevelOuter[2] = maxTessellation; 
        gl_TessLevelOuter[3] = maxTessellation; 

        gl_TessLevelInner[0] = maxTessellation; 
        gl_TessLevelInner[1] = maxTessellation; 
    }
}