#define_import_path bevy_pbr::mesh_view_types

struct View {
    view_proj: mat4x4<f32>,
    inverse_view_proj: mat4x4<f32>,
    view: mat4x4<f32>,
    inverse_view: mat4x4<f32>,
    projection: mat4x4<f32>,
    inverse_projection: mat4x4<f32>,
    world_position: vec3<f32>,
    width: f32,
    height: f32,
};

struct PointLight {
    // For point lights: the lower-right 2x2 values of the projection matrix [2][2] [2][3] [3][2] [3][3]
    // For spot lights: the direction (x,z), spot_scale and spot_offset
    light_custom_data: vec4<f32>,
    color_inverse_square_range: vec4<f32>,
    position_radius: vec4<f32>,
    // 'flags' is a bit field indicating various options. u32 is 32 bits so we have up to 32 options.
    flags: u32,
    shadow_depth_bias: f32,
    shadow_normal_bias: f32,
    spot_light_tan_angle: f32,
};

const POINT_LIGHT_FLAGS_SHADOWS_ENABLED_BIT: u32   = 1u;
const POINT_LIGHT_FLAGS_SPOT_LIGHT_Y_NEGATIVE: u32 = 2u;

struct DirectionalLight {
    view_projection: mat4x4<f32>,
    color: vec4<f32>,
    direction_to_light: vec3<f32>,
    // 'flags' is a bit field indicating various options. u32 is 32 bits so we have up to 32 options.
    flags: u32,
    shadow_depth_bias: f32,
    shadow_normal_bias: f32,
};

const DIRECTIONAL_LIGHT_FLAGS_SHADOWS_ENABLED_BIT: u32 = 1u;

struct Lights {
    // NOTE: this array size must be kept in sync with the constants defined bevy_pbr2/src/render/light.rs
    directional_lights: array<DirectionalLight, 1u>,
    ambient_color: vec4<f32>,
    // x/y/z dimensions and n_clusters in w
    cluster_dimensions: vec4<u32>,
    // xy are vec2<f32>(cluster_dimensions.xy) / vec2<f32>(view.width, view.height)
    //
    // For perspective projections:
    // z is cluster_dimensions.z / log(far / near)
    // w is cluster_dimensions.z * log(near) / log(far / near)
    //
    // For orthographic projections:
    // NOTE: near and far are +ve but -z is infront of the camera
    // z is -near
    // w is cluster_dimensions.z / (-far - -near)
    cluster_factors: vec4<f32>,
    n_directional_lights: u32,
    spot_light_shadowmap_offset: i32,
};

#ifdef NO_STORAGE_BUFFERS_SUPPORT
struct PointLights {
    data: array<PointLight, 256u>,
};
struct ClusterLightIndexLists {
    // each u32 contains 4 u8 indices into the PointLights array
    data: array<vec4<u32>, 1024u>,
};
struct ClusterOffsetsAndCounts {
    // each u32 contains a 24-bit index into ClusterLightIndexLists in the high 24 bits
    // and an 8-bit count of the number of lights in the low 8 bits
    data: array<vec4<u32>, 1024u>,
};
#else
struct PointLights {
    data: array<PointLight>,
};
struct ClusterLightIndexLists {
    data: array<u32>,
};
struct ClusterOffsetsAndCounts {
    data: array<vec4<u32>>,
};
#endif