// Constant Buffer for Transformation Matrices
cbuffer TransformBuffer : register(b0, space1)
{
    float4x4 world_to_projection;
    float4x4 projection_to_world;
    float4x4 world_to_view;
    float4x4 view_to_projection;
    float3 camera_pos_world;
    float viewport_min_z;    
    float3 camera_dir_world;
    float viewport_max_z;
    float2 viewport_size;
    float2 viewport_offset;
    float2 render_size;
    float time; // time in seconds since app start
}