frienderer 0.3.0

Very simple OpenGL renderer, mainly for GUIs.
Documentation 
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#version 330

uniform vec2 u_viewport;

in vec2 position;
in vec2 size;
in vec4 border_radius;
in vec4 border_width;
in int fill_color;
in int stroke_color;
in float box_blur;

out vec2 v_uv;
out vec2 v_size;
out vec4 v_border_radius;
out vec4 v_border_width;
flat out int v_fill_color;
flat out int v_stroke_color;
out float v_box_blur;

const vec2[4] uvs = vec2[4](
        vec2(-0.5, -0.5),
        vec2(-0.5, 0.5),
        vec2(0.5, 0.5),
        vec2(0.5, -0.5)
    );

vec2 from_pixel_pos(vec2 position, vec2 viewport) {
    return mix(vec2(-1.0, 1.0), vec2(1.0, -1.0), position / u_viewport);
}

void main() {
    gl_Position = vec4(from_pixel_pos(position, u_viewport), 0.0, 1.0);
    v_uv = uvs[gl_VertexID % 4];
    v_size = size;
    v_fill_color = fill_color;
    v_stroke_color = stroke_color;
    v_border_radius = border_radius;
    v_border_width = border_width;
    v_box_blur = box_blur;
}