layout (location = 0) in vec2 start;
layout (location = 1) in vec2 end;
layout (location = 2) in float z;
layout (location = 3) in vec4 color;
layout (location = 4) in float width;

out vec4 v_color;

uniform mat4 projection;

void main()
{

	vec2 norm = normalize(end - start);
	vec2 perp = vec2(-norm.x, norm.y);

	float x0 = start.x;
	float x1 = end.x;
	float x2 = x1 + width / 2 * perp.y;
	float x3 = x0 + width / 2 * perp.y;

	float y0 = start.y;
	float y1 = end.y;
	float y2 = y1 + width / 2 * perp.x;
	float y3 = y0 + width / 2 * perp.x;

	vec3 pos_arr[6];
	pos_arr[0] = vec3(x0, y0, z);
	pos_arr[1] = vec3(x1, y1, z);
	pos_arr[2] = vec3(x2, y2, z);
	pos_arr[3] = vec3(x0, y0, z);
	pos_arr[4] = vec3(x2, y2, z);
	pos_arr[5] = vec3(x3, y3, z);

	vec4 pos = vec4(pos_arr[gl_VertexID], 1);
	pos = projection * pos;
	gl_Position = pos;

	v_color = color;
}