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#version 330 core
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
in VS_OUT {
vec2 gtex_coords;
} gs_in[];
out vec2 ftex_coords;
uniform float time;
vec3
get_normal(void)
{
vec3 a = vec3(gl_in[0].gl_Position)-vec3(gl_in[1].gl_Position);
vec3 b = vec3(gl_in[2].gl_Position)-vec3(gl_in[1].gl_Position);
return(normalize(cross(a, b)));
}
vec4
explode(vec4 position, vec3 normal)
{
float magnitude = 0.2f;
vec3 direction = normal*magnitude*((sin(time)+1.0f)/2.0f);
vec4 result = position+vec4(direction, 0.0f);
return(result);
}
void
main(void)
{
vec3 normal = get_normal();
gl_Position = explode(gl_in[0].gl_Position, normal);
ftex_coords = gs_in[0].gtex_coords;
EmitVertex();
gl_Position = explode(gl_in[1].gl_Position, normal);
ftex_coords = gs_in[1].gtex_coords;
EmitVertex();
gl_Position = explode(gl_in[2].gl_Position, normal);
ftex_coords = gs_in[2].gtex_coords;
EmitVertex();
EndPrimitive();
}
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