#version 330 core
layout (location = 0) in vec2 p0;
layout (location = 1) in vec2 p1;
layout (location = 2) in vec4 color;
layout (location = 3) in float border_radius;
layout (location = 4) in float border_thickness;
layout (location = 5) in float edge_softness;

uniform mat4 projection;

out vec4 frag_color;
out vec2 frag_dest_position;
out vec2 frag_dest_center;
out vec2 frag_dest_half_size;
out float frag_softness;
out float frag_border_radius;
out float frag_border_thickness;

const vec2 rectangle_vertices[4] = vec2[](
    vec2(-1, -1),
    vec2(-1,  1),
    vec2( 1, -1),
    vec2( 1,  1)
);

void main() {
    vec2 dest_half_size = (p1 - p0) / 2;
    vec2 dest_center = (p1 + p0) / 2;
    vec2 dest_position = rectangle_vertices[gl_VertexID] * dest_half_size + dest_center;

    gl_Position = projection * vec4(
        dest_position,
        0,
        1
    );

    frag_color = color;
    frag_dest_position = dest_position;
    frag_dest_center = dest_center;
    frag_dest_half_size = dest_half_size;
    frag_border_radius = border_radius;
    frag_border_thickness = border_thickness;
    frag_softness = edge_softness;
}