struct Camera {
    mat4 m_View;            // 64
    mat4 m_Projection;      // 128
    mat4 m_InvView;         // 192
    mat4 m_InvProjection;   // 256
    vec4 m_Position;        // 272
};

struct Lighting
{
    uint m_EnvCubeHandle;           // 4 
    uint m_DiffuseIrradianceHandle; // 8
    uint m_PrefilterHandle;         // 12
    uint m_BrdfLutHandle;           // 16
    uint m_LightHandle;             // 20
    uint m_PointLightIndexer;       // 24
    uint m_DirectionalLightIndexer; // 28
};

layout(set=1, binding=0) uniform Ubo {
    Camera camera;
    Lighting lights;
};

// Little Endian storage. First short is least significant.
#define IndexerCount(Indexer) (Indexer & 0xFFFF)
#define IndexerOffset(Indexer) ((Indexer & 0xFFFF0000) >> 16)

#define PI 3.1415926535

vec3 Uncharted2Tonemap(vec3 color)
{
    float A = 0.15f;
    float B = 0.50f;
    float C = 0.10f;
    float D = 0.20f;
    float E = 0.02f;
    float F = 0.30f;
    float W = 11.2f;
    return ((color * (A * color + C * B) + D * E) / (color * (A * color + B) + D * F)) - E / F;
}