/*************************************************************************/
/*  visual_instance.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* "Software"), to deal in the Software without restriction, including   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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/*************************************************************************/

#include "visual_instance.h"

#include "scene/scene_string_names.h"
#include "servers/visual_server.h"
#include "skeleton.h"

AABB VisualInstance::get_transformed_aabb() const {

	return get_global_transform().xform(get_aabb());
}

void VisualInstance::_update_visibility() {

	if (!is_inside_tree()) {
		return;
	}

	bool visible = is_visible_in_tree();

	// keep a quick flag available in each node.
	// no need to call is_visible_in_tree all over the place,
	// providing it is propagated with a notification.
	bool already_visible = (_get_spatial_flags() & SPATIAL_FLAG_VI_VISIBLE) != 0;
	_set_spatial_flag(SPATIAL_FLAG_VI_VISIBLE, visible);

	// if making visible, make sure the visual server is up to date with the transform
	if (visible && (!already_visible)) {
		Transform gt = get_global_transform();
		VisualServer::get_singleton()->instance_set_transform(instance, gt);
	}

	_change_notify("visible");
	VS::get_singleton()->instance_set_visible(get_instance(), visible);
}

void VisualInstance::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_WORLD: {

			// CHECK SKELETON => moving skeleton attaching logic to MeshInstance
			/*
			Skeleton *skeleton=Object::cast_to<Skeleton>(get_parent());
			if (skeleton)
				VisualServer::get_singleton()->instance_attach_skeleton( instance, skeleton->get_skeleton() );
			*/
			ERR_FAIL_COND(get_world().is_null());
			VisualServer::get_singleton()->instance_set_scenario(instance, get_world()->get_scenario());
			_update_visibility();

		} break;
		case NOTIFICATION_TRANSFORM_CHANGED: {

			if (_get_spatial_flags() & SPATIAL_FLAG_VI_VISIBLE) {
				Transform gt = get_global_transform();
				VisualServer::get_singleton()->instance_set_transform(instance, gt);
			}
		} break;
		case NOTIFICATION_EXIT_WORLD: {

			VisualServer::get_singleton()->instance_set_scenario(instance, RID());
			VisualServer::get_singleton()->instance_attach_skeleton(instance, RID());
			//VS::get_singleton()->instance_geometry_set_baked_light_sampler(instance, RID() );

			// the vi visible flag is always set to invisible when outside the tree,
			// so it can detect re-entering the tree and becoming visible, and send
			// the transform to the visual server
			_set_spatial_flag(SPATIAL_FLAG_VI_VISIBLE, false);
		} break;
		case NOTIFICATION_VISIBILITY_CHANGED: {

			_update_visibility();
		} break;
	}
}

RID VisualInstance::get_instance() const {

	return instance;
}

RID VisualInstance::_get_visual_instance_rid() const {

	return instance;
}

void VisualInstance::set_layer_mask(uint32_t p_mask) {

	layers = p_mask;
	VisualServer::get_singleton()->instance_set_layer_mask(instance, p_mask);
}

uint32_t VisualInstance::get_layer_mask() const {

	return layers;
}

void VisualInstance::set_layer_mask_bit(int p_layer, bool p_enable) {
	ERR_FAIL_INDEX(p_layer, 32);
	if (p_enable) {
		set_layer_mask(layers | (1 << p_layer));
	} else {
		set_layer_mask(layers & (~(1 << p_layer)));
	}
}

bool VisualInstance::get_layer_mask_bit(int p_layer) const {
	ERR_FAIL_INDEX_V(p_layer, 32, false);
	return (layers & (1 << p_layer));
}

void VisualInstance::_bind_methods() {

	ClassDB::bind_method(D_METHOD("_get_visual_instance_rid"), &VisualInstance::_get_visual_instance_rid);
	ClassDB::bind_method(D_METHOD("set_base", "base"), &VisualInstance::set_base);
	ClassDB::bind_method(D_METHOD("get_base"), &VisualInstance::get_base);
	ClassDB::bind_method(D_METHOD("get_instance"), &VisualInstance::get_instance);
	ClassDB::bind_method(D_METHOD("set_layer_mask", "mask"), &VisualInstance::set_layer_mask);
	ClassDB::bind_method(D_METHOD("get_layer_mask"), &VisualInstance::get_layer_mask);
	ClassDB::bind_method(D_METHOD("set_layer_mask_bit", "layer", "enabled"), &VisualInstance::set_layer_mask_bit);
	ClassDB::bind_method(D_METHOD("get_layer_mask_bit", "layer"), &VisualInstance::get_layer_mask_bit);

	ClassDB::bind_method(D_METHOD("get_transformed_aabb"), &VisualInstance::get_transformed_aabb);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "layers", PROPERTY_HINT_LAYERS_3D_RENDER), "set_layer_mask", "get_layer_mask");
}

void VisualInstance::set_base(const RID &p_base) {

	VisualServer::get_singleton()->instance_set_base(instance, p_base);
	base = p_base;
}

RID VisualInstance::get_base() const {

	return base;
}

VisualInstance::VisualInstance() {

	instance = VisualServer::get_singleton()->instance_create();
	VisualServer::get_singleton()->instance_attach_object_instance_id(instance, get_instance_id());
	layers = 1;
	set_notify_transform(true);
}

VisualInstance::~VisualInstance() {

	VisualServer::get_singleton()->free(instance);
}

void GeometryInstance::set_material_override(const Ref<Material> &p_material) {

	material_override = p_material;
	VS::get_singleton()->instance_geometry_set_material_override(get_instance(), p_material.is_valid() ? p_material->get_rid() : RID());
}

Ref<Material> GeometryInstance::get_material_override() const {

	return material_override;
}

void GeometryInstance::set_generate_lightmap(bool p_enabled) {
	generate_lightmap = p_enabled;
}

bool GeometryInstance::get_generate_lightmap() {
	return generate_lightmap;
}

void GeometryInstance::set_lightmap_scale(LightmapScale p_scale) {
	ERR_FAIL_INDEX(p_scale, LIGHTMAP_SCALE_MAX);
	lightmap_scale = p_scale;
}

GeometryInstance::LightmapScale GeometryInstance::get_lightmap_scale() const {
	return lightmap_scale;
}

void GeometryInstance::set_lod_min_distance(float p_dist) {

	lod_min_distance = p_dist;
	VS::get_singleton()->instance_geometry_set_draw_range(get_instance(), lod_min_distance, lod_max_distance, lod_min_hysteresis, lod_max_hysteresis);
}

float GeometryInstance::get_lod_min_distance() const {

	return lod_min_distance;
}

void GeometryInstance::set_lod_max_distance(float p_dist) {

	lod_max_distance = p_dist;
	VS::get_singleton()->instance_geometry_set_draw_range(get_instance(), lod_min_distance, lod_max_distance, lod_min_hysteresis, lod_max_hysteresis);
}

float GeometryInstance::get_lod_max_distance() const {

	return lod_max_distance;
}

void GeometryInstance::set_lod_min_hysteresis(float p_dist) {

	lod_min_hysteresis = p_dist;
	VS::get_singleton()->instance_geometry_set_draw_range(get_instance(), lod_min_distance, lod_max_distance, lod_min_hysteresis, lod_max_hysteresis);
}

float GeometryInstance::get_lod_min_hysteresis() const {

	return lod_min_hysteresis;
}

void GeometryInstance::set_lod_max_hysteresis(float p_dist) {

	lod_max_hysteresis = p_dist;
	VS::get_singleton()->instance_geometry_set_draw_range(get_instance(), lod_min_distance, lod_max_distance, lod_min_hysteresis, lod_max_hysteresis);
}

float GeometryInstance::get_lod_max_hysteresis() const {

	return lod_max_hysteresis;
}

void GeometryInstance::_notification(int p_what) {
}

void GeometryInstance::set_flag(Flags p_flag, bool p_value) {

	ERR_FAIL_INDEX(p_flag, FLAG_MAX);
	if (flags[p_flag] == p_value)
		return;

	flags[p_flag] = p_value;
	VS::get_singleton()->instance_geometry_set_flag(get_instance(), (VS::InstanceFlags)p_flag, p_value);
}

bool GeometryInstance::get_flag(Flags p_flag) const {

	ERR_FAIL_INDEX_V(p_flag, FLAG_MAX, false);

	return flags[p_flag];
}

void GeometryInstance::set_cast_shadows_setting(ShadowCastingSetting p_shadow_casting_setting) {

	shadow_casting_setting = p_shadow_casting_setting;

	VS::get_singleton()->instance_geometry_set_cast_shadows_setting(get_instance(), (VS::ShadowCastingSetting)p_shadow_casting_setting);
}

GeometryInstance::ShadowCastingSetting GeometryInstance::get_cast_shadows_setting() const {

	return shadow_casting_setting;
}

void GeometryInstance::set_extra_cull_margin(float p_margin) {

	ERR_FAIL_COND(p_margin < 0);
	extra_cull_margin = p_margin;
	VS::get_singleton()->instance_set_extra_visibility_margin(get_instance(), extra_cull_margin);
}

float GeometryInstance::get_extra_cull_margin() const {

	return extra_cull_margin;
}

void GeometryInstance::set_custom_aabb(AABB aabb) {

	VS::get_singleton()->instance_set_custom_aabb(get_instance(), aabb);
}

void GeometryInstance::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_material_override", "material"), &GeometryInstance::set_material_override);
	ClassDB::bind_method(D_METHOD("get_material_override"), &GeometryInstance::get_material_override);

	ClassDB::bind_method(D_METHOD("set_flag", "flag", "value"), &GeometryInstance::set_flag);
	ClassDB::bind_method(D_METHOD("get_flag", "flag"), &GeometryInstance::get_flag);

	ClassDB::bind_method(D_METHOD("set_cast_shadows_setting", "shadow_casting_setting"), &GeometryInstance::set_cast_shadows_setting);
	ClassDB::bind_method(D_METHOD("get_cast_shadows_setting"), &GeometryInstance::get_cast_shadows_setting);

	ClassDB::bind_method(D_METHOD("set_generate_lightmap", "enabled"), &GeometryInstance::set_generate_lightmap);
	ClassDB::bind_method(D_METHOD("get_generate_lightmap"), &GeometryInstance::get_generate_lightmap);

	ClassDB::bind_method(D_METHOD("set_lightmap_scale", "scale"), &GeometryInstance::set_lightmap_scale);
	ClassDB::bind_method(D_METHOD("get_lightmap_scale"), &GeometryInstance::get_lightmap_scale);

	ClassDB::bind_method(D_METHOD("set_lod_max_hysteresis", "mode"), &GeometryInstance::set_lod_max_hysteresis);
	ClassDB::bind_method(D_METHOD("get_lod_max_hysteresis"), &GeometryInstance::get_lod_max_hysteresis);

	ClassDB::bind_method(D_METHOD("set_lod_max_distance", "mode"), &GeometryInstance::set_lod_max_distance);
	ClassDB::bind_method(D_METHOD("get_lod_max_distance"), &GeometryInstance::get_lod_max_distance);

	ClassDB::bind_method(D_METHOD("set_lod_min_hysteresis", "mode"), &GeometryInstance::set_lod_min_hysteresis);
	ClassDB::bind_method(D_METHOD("get_lod_min_hysteresis"), &GeometryInstance::get_lod_min_hysteresis);

	ClassDB::bind_method(D_METHOD("set_lod_min_distance", "mode"), &GeometryInstance::set_lod_min_distance);
	ClassDB::bind_method(D_METHOD("get_lod_min_distance"), &GeometryInstance::get_lod_min_distance);

	ClassDB::bind_method(D_METHOD("set_extra_cull_margin", "margin"), &GeometryInstance::set_extra_cull_margin);
	ClassDB::bind_method(D_METHOD("get_extra_cull_margin"), &GeometryInstance::get_extra_cull_margin);

	ClassDB::bind_method(D_METHOD("set_custom_aabb", "aabb"), &GeometryInstance::set_custom_aabb);

	ClassDB::bind_method(D_METHOD("get_aabb"), &GeometryInstance::get_aabb);

	ADD_GROUP("Geometry", "");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "material_override", PROPERTY_HINT_RESOURCE_TYPE, "ShaderMaterial,SpatialMaterial"), "set_material_override", "get_material_override");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "cast_shadow", PROPERTY_HINT_ENUM, "Off,On,Double-Sided,Shadows Only"), "set_cast_shadows_setting", "get_cast_shadows_setting");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "extra_cull_margin", PROPERTY_HINT_RANGE, "0,16384,0.01"), "set_extra_cull_margin", "get_extra_cull_margin");

	ADD_GROUP("Baked Light", "");
	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "use_in_baked_light"), "set_flag", "get_flag", FLAG_USE_BAKED_LIGHT);
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "generate_lightmap"), "set_generate_lightmap", "get_generate_lightmap");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "lightmap_scale", PROPERTY_HINT_ENUM, "1x,2x,4x,8x"), "set_lightmap_scale", "get_lightmap_scale");

	ADD_GROUP("LOD", "lod_");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "lod_min_distance", PROPERTY_HINT_RANGE, "0,32768,0.01"), "set_lod_min_distance", "get_lod_min_distance");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "lod_min_hysteresis", PROPERTY_HINT_RANGE, "0,32768,0.01"), "set_lod_min_hysteresis", "get_lod_min_hysteresis");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "lod_max_distance", PROPERTY_HINT_RANGE, "0,32768,0.01"), "set_lod_max_distance", "get_lod_max_distance");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "lod_max_hysteresis", PROPERTY_HINT_RANGE, "0,32768,0.01"), "set_lod_max_hysteresis", "get_lod_max_hysteresis");

	//ADD_SIGNAL( MethodInfo("visibility_changed"));

	BIND_ENUM_CONSTANT(LIGHTMAP_SCALE_1X);
	BIND_ENUM_CONSTANT(LIGHTMAP_SCALE_2X);
	BIND_ENUM_CONSTANT(LIGHTMAP_SCALE_4X);
	BIND_ENUM_CONSTANT(LIGHTMAP_SCALE_8X);
	BIND_ENUM_CONSTANT(LIGHTMAP_SCALE_MAX);

	BIND_ENUM_CONSTANT(SHADOW_CASTING_SETTING_OFF);
	BIND_ENUM_CONSTANT(SHADOW_CASTING_SETTING_ON);
	BIND_ENUM_CONSTANT(SHADOW_CASTING_SETTING_DOUBLE_SIDED);
	BIND_ENUM_CONSTANT(SHADOW_CASTING_SETTING_SHADOWS_ONLY);

	BIND_ENUM_CONSTANT(FLAG_USE_BAKED_LIGHT);
	BIND_ENUM_CONSTANT(FLAG_DRAW_NEXT_FRAME_IF_VISIBLE);
	BIND_ENUM_CONSTANT(FLAG_MAX);
}

GeometryInstance::GeometryInstance() {
	lod_min_distance = 0;
	lod_max_distance = 0;
	lod_min_hysteresis = 0;
	lod_max_hysteresis = 0;

	for (int i = 0; i < FLAG_MAX; i++) {
		flags[i] = false;
	}

	shadow_casting_setting = SHADOW_CASTING_SETTING_ON;
	extra_cull_margin = 0;
	generate_lightmap = true;
	lightmap_scale = LightmapScale::LIGHTMAP_SCALE_1X;
	//VS::get_singleton()->instance_geometry_set_baked_light_texture_index(get_instance(),0);
}