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#version 400 core
layout( quads, fractional_even_spacing, ccw ) in;
out EyeSpaceVertex {
vec3 position;
vec3 normal;
} te_out;
uniform mat4 modelView;
uniform mat3 modelViewNormal;
uniform mat4 projectionMatrix;
uniform mat4 mvp;
void main()
{
float u = gl_TessCoord.x;
float v = gl_TessCoord.y;
vec4 p00 = gl_in[0].gl_Position;
vec4 p10 = gl_in[1].gl_Position;
vec4 p11 = gl_in[2].gl_Position;
vec4 p01 = gl_in[3].gl_Position;
// Linearly interpolate to the vertex position using the
// (u,v) barycentric coords
vec4 pos = p00 * ( 1.0 - u ) * ( 1.0 - v )
+ p10 * u * ( 1.0 - v )
+ p01 * v * ( 1.0 - u )
+ p11 * u * v;
// Transform to eye space (for lighting calcs)
te_out.position = vec3( modelView * pos );
// Assume normal points along z
te_out.normal = normalize( modelViewNormal * vec3( 0.0, 0.0, 1.0 ) );
// Transform to clip-space
gl_Position = mvp * pos;
}
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