shadow.glsl

//shadows
    vec4 world_pos = p3d_ViewProjectionMatrixInverse * vec4( uv.xy * 2.0 - vec2(1.0), depth, 1.0);
    world_pos.xyz /= world_pos.w;
    world_pos.xyz-=light_pos.xyz;
    vec4 shadow_uv=trans_render_to_shadowcaster*world_pos;
    float ldist = max(abs(shadow_uv.x), max(abs(shadow_uv.y), abs(shadow_uv.z)));
    ldist = ((light_radius+light_view_pos.w)/(light_radius-light_view_pos.w))+((-2.0*light_radius*light_view_pos.w)/(ldist * (light_radius-light_view_pos.w)));
    float shadow= float(texture(shadowcaster.shadowMap, shadow_uv.xyz).r >= ldist * 0.5 + 0.5);