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Tessellation Trouble

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I'm trying to get some old tessellation code running, but my objects just disappear when I set the draw mode to GL_PATCHES. Here is my control shader:
#version 410

layout(vertices = 3) out;

in vec4 ctrl_position[];

out vec4 eval_position[];

void main()
    float TessLevelInner = 1.0;
    float TessLevelOuter = 1.0;

    if (gl_InvocationID == 0) {
        gl_TessLevelInner[0] = TessLevelInner;
        gl_TessLevelOuter[0] = TessLevelOuter;
        gl_TessLevelOuter[1] = TessLevelOuter;
        gl_TessLevelOuter[2] = TessLevelOuter;
    eval_position[gl_InvocationID] = ctrl_position[gl_InvocationID];
And my evaluation shader:
#version 400

layout(triangles, equal_spacing, ccw) in;

in vec4 eval_position[];

void main()
    gl_Position = (eval_position[0] * gl_TessCoord.x + eval_position[1] * gl_TessCoord.y + eval_position[2] * gl_TessCoord.z);
Do you see anything wrong? Edited by Josh Klint

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