#version 450

vec2 temp_pos;
vec4 temp_color;

// layout(location = 0) out vec4 out_var_TEXCOORD0;
layout(location = 0) out vec4 outColor;

void main()
{
    vec4 color;
    vec2 pos;

    if (uint(gl_VertexIndex) == 0u)
    {
        color = vec4(1.0, 0.0, 0.0, 1.0);
        pos = vec2(-0.5);
    }
    else
    {
        vec4 vert_color;
        vec2 vert_pos;
        if (uint(gl_VertexIndex) == 1u)
        {
            vert_color = vec4(0.0, 1.0, 0.0, 1.0);
            vert_pos = vec2(0.5, -0.5);
        }
        else
        {
            bool index_exists = uint(gl_VertexIndex) == 2u;
            vert_color = mix(temp_color, vec4(0.0, 0.0, 1.0, 1.0), bvec4(index_exists));
            vert_pos = mix(temp_pos, vec2(0.0, 0.5), bvec2(index_exists));
        }
        color = vert_color;
        pos = vert_pos;
    }

    // out_var_TEXCOORD0 = color;
    outColor = color;
    gl_Position = vec4(pos, 0.0, 1.0);
}