#define M_PI 3.14159265359
#define ROUGHNESS_MAX_LOD 5

layout(push_constant, binding = 0, std430) uniform DrawCall {
	uint instance_index;
	uint pad[3]; //16 bits minimum size
}
draw_call;

/* Set 0 Scene data that never changes, ever */

#define SAMPLER_NEAREST_CLAMP 0
#define SAMPLER_LINEAR_CLAMP 1
#define SAMPLER_NEAREST_WITH_MIPMAPS_CLAMP 2
#define SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP 3
#define SAMPLER_NEAREST_WITH_MIPMAPS_ANISOTROPIC_CLAMP 4
#define SAMPLER_LINEAR_WITH_MIPMAPS_ANISOTROPIC_CLAMP 5
#define SAMPLER_NEAREST_REPEAT 6
#define SAMPLER_LINEAR_REPEAT 7
#define SAMPLER_NEAREST_WITH_MIPMAPS_REPEAT 8
#define SAMPLER_LINEAR_WITH_MIPMAPS_REPEAT 9
#define SAMPLER_NEAREST_WITH_MIPMAPS_ANISOTROPIC_REPEAT 10
#define SAMPLER_LINEAR_WITH_MIPMAPS_ANISOTROPIC_REPEAT 11

layout(set = 0, binding = 1) uniform sampler material_samplers[12];

layout(set = 0, binding = 2) uniform sampler shadow_sampler;

layout(set = 0, binding = 3, std140) uniform SceneData {

	mat4 projection_matrix;
	mat4 inv_projection_matrix;

	mat4 camera_matrix;
	mat4 inv_camera_matrix;

	vec2 viewport_size;
	vec2 screen_pixel_size;

	float time;
	float reflection_multiplier; // one normally, zero when rendering reflections

	bool pancake_shadows;
	uint pad;

	//use vec4s because std140 doesnt play nice with vec2s, z and w are wasted
	vec4 directional_penumbra_shadow_kernel[32];
	vec4 directional_soft_shadow_kernel[32];
	vec4 penumbra_shadow_kernel[32];
	vec4 soft_shadow_kernel[32];

	uint directional_penumbra_shadow_samples;
	uint directional_soft_shadow_samples;
	uint penumbra_shadow_samples;
	uint soft_shadow_samples;

	vec4 ambient_light_color_energy;

	float ambient_color_sky_mix;
	bool use_ambient_light;
	bool use_ambient_cubemap;
	bool use_reflection_cubemap;

	mat3 radiance_inverse_xform;

	vec2 shadow_atlas_pixel_size;
	vec2 directional_shadow_pixel_size;

	uint directional_light_count;
	float dual_paraboloid_side;
	float z_far;
	float z_near;

	bool ssao_enabled;
	float ssao_light_affect;
	float ssao_ao_affect;
	bool roughness_limiter_enabled;

	vec4 ao_color;

#if 0
	vec4 ambient_light_color;
	vec4 bg_color;

	vec4 fog_color_enabled;
	vec4 fog_sun_color_amount;

	float ambient_energy;
	float bg_energy;
#endif

#if 0
	vec2 shadow_atlas_pixel_size;
	vec2 directional_shadow_pixel_size;

	float z_far;

	float subsurface_scatter_width;
	float ambient_occlusion_affect_light;
	float ambient_occlusion_affect_ao_channel;
	float opaque_prepass_threshold;

	bool fog_depth_enabled;
	float fog_depth_begin;
	float fog_depth_end;
	float fog_density;
	float fog_depth_curve;
	bool fog_transmit_enabled;
	float fog_transmit_curve;
	bool fog_height_enabled;
	float fog_height_min;
	float fog_height_max;
	float fog_height_curve;
#endif
}
scene_data;

#define INSTANCE_FLAGS_FORWARD_MASK 0x7
#define INSTANCE_FLAGS_FORWARD_OMNI_LIGHT_SHIFT 3
#define INSTANCE_FLAGS_FORWARD_SPOT_LIGHT_SHIFT 6
#define INSTANCE_FLAGS_FORWARD_DECAL_SHIFT 9

#define INSTANCE_FLAGS_MULTIMESH (1 << 12)
#define INSTANCE_FLAGS_MULTIMESH_FORMAT_2D (1 << 13)
#define INSTANCE_FLAGS_MULTIMESH_HAS_COLOR (1 << 14)
#define INSTANCE_FLAGS_MULTIMESH_HAS_CUSTOM_DATA (1 << 15)
#define INSTANCE_FLAGS_MULTIMESH_STRIDE_SHIFT 16
//3 bits of stride
#define INSTANCE_FLAGS_MULTIMESH_STRIDE_MASK 0x7

#define INSTANCE_FLAGS_SKELETON (1 << 19)

struct InstanceData {
	mat4 transform;
	mat4 normal_transform;
	uint flags;
	uint instance_uniforms_ofs; //base offset in global buffer for instance variables
	uint gi_offset; //GI information when using lightmapping (VCT or lightmap)
	uint layer_mask;
};

layout(set = 0, binding = 4, std430) restrict readonly buffer Instances {
	InstanceData data[];
}
instances;

struct LightData { //this structure needs to be as packed as possible
	vec3 position;
	float inv_radius;
	vec3 direction;
	float size;
	uint attenuation_energy; //attenuation
	uint color_specular; //rgb color, a specular (8 bit unorm)
	uint cone_attenuation_angle; // attenuation and angle, (16bit float)
	uint shadow_color_enabled; //shadow rgb color, a>0.5 enabled (8bit unorm)
	vec4 atlas_rect; // rect in the shadow atlas
	mat4 shadow_matrix;
	float shadow_bias;
	float shadow_normal_bias;
	float transmittance_bias;
	float soft_shadow_size; // for spot, it's the size in uv coordinates of the light, for omni it's the span angle
	float soft_shadow_scale; // scales the shadow kernel for blurrier shadows
	uint mask;
	uint pad[2];
	vec4 projector_rect; //projector rect in srgb decal atlas
};

layout(set = 0, binding = 5, std430) restrict readonly buffer Lights {
	LightData data[];
}
lights;

struct ReflectionData {

	vec3 box_extents;
	float index;
	vec3 box_offset;
	uint mask;
	vec4 params; // intensity, 0, interior , boxproject
	vec4 ambient; // ambient color, energy
	mat4 local_matrix; // up to here for spot and omni, rest is for directional
	// notes: for ambientblend, use distance to edge to blend between already existing global environment
};

layout(set = 0, binding = 6, std140) uniform ReflectionProbeData {
	ReflectionData data[MAX_REFLECTION_DATA_STRUCTS];
}
reflections;

struct DirectionalLightData {
	vec3 direction;
	float energy;
	vec3 color;
	float size;
	float specular;
	uint mask;
	float softshadow_angle;
	float soft_shadow_scale;
	bool blend_splits;
	bool shadow_enabled;
	float fade_from;
	float fade_to;
	vec4 shadow_bias;
	vec4 shadow_normal_bias;
	vec4 shadow_transmittance_bias;
	vec4 shadow_transmittance_z_scale;
	vec4 shadow_range_begin;
	vec4 shadow_split_offsets;
	mat4 shadow_matrix1;
	mat4 shadow_matrix2;
	mat4 shadow_matrix3;
	mat4 shadow_matrix4;
	vec4 shadow_color1;
	vec4 shadow_color2;
	vec4 shadow_color3;
	vec4 shadow_color4;
	vec2 uv_scale1;
	vec2 uv_scale2;
	vec2 uv_scale3;
	vec2 uv_scale4;
};

layout(set = 0, binding = 7, std140) uniform DirectionalLights {
	DirectionalLightData data[MAX_DIRECTIONAL_LIGHT_DATA_STRUCTS];
}
directional_lights;

struct GIProbeData {
	mat4 xform;
	vec3 bounds;
	float dynamic_range;

	float bias;
	float normal_bias;
	bool blend_ambient;
	uint texture_slot;

	float anisotropy_strength;
	float ambient_occlusion;
	float ambient_occlusion_size;
	uint pad2;
};

layout(set = 0, binding = 8, std140) uniform GIProbes {
	GIProbeData data[MAX_GI_PROBES];
}
gi_probes;

layout(set = 0, binding = 9) uniform texture3D gi_probe_textures[MAX_GI_PROBE_TEXTURES];

#define CLUSTER_COUNTER_SHIFT 20
#define CLUSTER_POINTER_MASK ((1 << CLUSTER_COUNTER_SHIFT) - 1)
#define CLUSTER_COUNTER_MASK 0xfff

layout(set = 0, binding = 10) uniform texture2D decal_atlas;
layout(set = 0, binding = 11) uniform texture2D decal_atlas_srgb;

struct DecalData {
	mat4 xform; //to decal transform
	vec3 inv_extents;
	float albedo_mix;
	vec4 albedo_rect;
	vec4 normal_rect;
	vec4 orm_rect;
	vec4 emission_rect;
	vec4 modulate;
	float emission_energy;
	uint mask;
	float upper_fade;
	float lower_fade;
	mat3x4 normal_xform;
	vec3 normal;
	float normal_fade;
};

layout(set = 0, binding = 12, std430) restrict readonly buffer Decals {
	DecalData data[];
}
decals;

layout(set = 0, binding = 13) uniform utexture3D cluster_texture;

layout(set = 0, binding = 14, std430) restrict readonly buffer ClusterData {
	uint indices[];
}
cluster_data;

layout(set = 0, binding = 15) uniform texture2D directional_shadow_atlas;

layout(set = 0, binding = 16, std430) restrict readonly buffer GlobalVariableData {
	vec4 data[];
}
global_variables;

// decal atlas

/* Set 1, Radiance */

#ifdef USE_RADIANCE_CUBEMAP_ARRAY

layout(set = 1, binding = 0) uniform textureCubeArray radiance_cubemap;

#else

layout(set = 1, binding = 0) uniform textureCube radiance_cubemap;

#endif

/* Set 2, Reflection and Shadow Atlases (view dependant) */

layout(set = 2, binding = 0) uniform textureCubeArray reflection_atlas;

layout(set = 2, binding = 1) uniform texture2D shadow_atlas;

/* Set 1, Render Buffers */

layout(set = 3, binding = 0) uniform texture2D depth_buffer;
layout(set = 3, binding = 1) uniform texture2D color_buffer;
layout(set = 3, binding = 2) uniform texture2D normal_buffer;
layout(set = 3, binding = 3) uniform texture2D roughness_buffer;
layout(set = 3, binding = 4) uniform texture2D ao_buffer;

/* Set 4 Skeleton & Instancing (Multimesh) */

layout(set = 4, binding = 0, std430) restrict readonly buffer Transforms {
	vec4 data[];
}
transforms;

/* Set 5 User Material */