#version 410
#define SCENE_EXTENT 100.0f

layout(points) in;
layout(line_strip, max_vertices = 5) out;

uniform mat4 matrModel;
uniform mat4 matrVisu;
uniform mat4 matrProj;

/////////////////////////////////////////////////////////////////

in Attribs {
    vec4 Pos;
    vec4 Att1;
    vec4 Att2;
} In[];

void main(void)
{
    if (In[0].Pos.x < -9000)
        return;
    float dThickness = In[0].Att1.w;
    float wThickness = In[0].Att1.w;
    vec3 center = vec3(In[0].Pos.x, 0, In[0].Pos.y);
    vec3 wavedir = vec3(In[0].Pos.z, 0, In[0].Pos.w);
    vec3 wavecrest = vec3(wavedir.z, 0, -wavedir.x); // wave crest, orthogonal to wave direction
    vec4 p1 = vec4(center - wThickness * wavecrest, 1);
    vec4 p2 = vec4(center - wThickness * wavecrest - dThickness * wavedir, 1);
    vec4 p3 = vec4(center + wThickness * wavecrest, 1);
    vec4 p4 = vec4(center + wThickness * wavecrest - dThickness * wavedir, 1);
    gl_Position = matrProj * matrVisu * matrModel * p1;
    EmitVertex();
    gl_Position = matrProj * matrVisu * matrModel * p2;
    EmitVertex();
    gl_Position = matrProj * matrVisu * matrModel * p4;
    EmitVertex();
    gl_Position = matrProj * matrVisu * matrModel * p3;
    EmitVertex();
    gl_Position = matrProj * matrVisu * matrModel * p1;
    EmitVertex();
}