/**************************************************************************/
/*  decal.cpp                                                             */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "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.        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
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/**************************************************************************/

#include "decal.h"

#include "core/object/class_db.h"
#include "core/os/os.h"
#include "servers/rendering/rendering_server.h"

void Decal::set_size(const Vector3 &p_size) {
	size = p_size.maxf(0.001);
	RS::get_singleton()->decal_set_size(decal, size);
	update_gizmos();
}

Vector3 Decal::get_size() const {
	return size;
}

void Decal::set_texture(DecalTexture p_type, const Ref<Texture2D> &p_texture) {
	ERR_FAIL_INDEX(p_type, TEXTURE_MAX);
	textures[p_type] = p_texture;
	RID texture_rid = p_texture.is_valid() ? p_texture->get_rid() : RID();

#ifdef DEBUG_ENABLED
	if (p_texture.is_valid() &&
			(p_texture->is_class("AnimatedTexture") ||
					p_texture->is_class("AtlasTexture") ||
					p_texture->is_class("CameraTexture") ||
					p_texture->is_class("CanvasTexture") ||
					p_texture->is_class("MeshTexture") ||
					p_texture->is_class("Texture2DRD") ||
					p_texture->is_class("ViewportTexture"))) {
		WARN_PRINT(vformat("%s cannot be used as a Decal texture (%s). As a workaround, assign the value returned by %s's `get_image()` instead.", p_texture->get_class(), get_path(), p_texture->get_class()));
	}
#endif

	RS::get_singleton()->decal_set_texture(decal, RSE::DecalTexture(p_type), texture_rid);
	update_configuration_warnings();
}

Ref<Texture2D> Decal::get_texture(DecalTexture p_type) const {
	ERR_FAIL_INDEX_V(p_type, TEXTURE_MAX, Ref<Texture2D>());
	return textures[p_type];
}

void Decal::set_emission_energy(real_t p_energy) {
	emission_energy = p_energy;
	RS::get_singleton()->decal_set_emission_energy(decal, emission_energy);
}

real_t Decal::get_emission_energy() const {
	return emission_energy;
}

void Decal::set_albedo_mix(real_t p_mix) {
	albedo_mix = p_mix;
	RS::get_singleton()->decal_set_albedo_mix(decal, albedo_mix);
}

real_t Decal::get_albedo_mix() const {
	return albedo_mix;
}

void Decal::set_upper_fade(real_t p_fade) {
	upper_fade = MAX(p_fade, 0.0);
	RS::get_singleton()->decal_set_fade(decal, upper_fade, lower_fade);
}

real_t Decal::get_upper_fade() const {
	return upper_fade;
}

void Decal::set_lower_fade(real_t p_fade) {
	lower_fade = MAX(p_fade, 0.0);
	RS::get_singleton()->decal_set_fade(decal, upper_fade, lower_fade);
}

real_t Decal::get_lower_fade() const {
	return lower_fade;
}

void Decal::set_normal_fade(real_t p_fade) {
	normal_fade = p_fade;
	RS::get_singleton()->decal_set_normal_fade(decal, normal_fade);
}

real_t Decal::get_normal_fade() const {
	return normal_fade;
}

void Decal::set_modulate(Color p_modulate) {
	modulate = p_modulate;
	RS::get_singleton()->decal_set_modulate(decal, p_modulate);
}

Color Decal::get_modulate() const {
	return modulate;
}

void Decal::set_enable_distance_fade(bool p_enable) {
	distance_fade_enabled = p_enable;
	RS::get_singleton()->decal_set_distance_fade(decal, distance_fade_enabled, distance_fade_begin, distance_fade_length);
	notify_property_list_changed();
}

bool Decal::is_distance_fade_enabled() const {
	return distance_fade_enabled;
}

void Decal::set_distance_fade_begin(real_t p_distance) {
	distance_fade_begin = p_distance;
	RS::get_singleton()->decal_set_distance_fade(decal, distance_fade_enabled, distance_fade_begin, distance_fade_length);
}

real_t Decal::get_distance_fade_begin() const {
	return distance_fade_begin;
}

void Decal::set_distance_fade_length(real_t p_length) {
	distance_fade_length = p_length;
	RS::get_singleton()->decal_set_distance_fade(decal, distance_fade_enabled, distance_fade_begin, distance_fade_length);
}

real_t Decal::get_distance_fade_length() const {
	return distance_fade_length;
}

void Decal::set_cull_mask(uint32_t p_layers) {
	cull_mask = p_layers;
	RS::get_singleton()->decal_set_cull_mask(decal, cull_mask);
	update_configuration_warnings();
}

uint32_t Decal::get_cull_mask() const {
	return cull_mask;
}

AABB Decal::get_aabb() const {
	AABB aabb;
	aabb.position = -size / 2;
	aabb.size = size;
	return aabb;
}

void Decal::_validate_property(PropertyInfo &p_property) const {
	if (p_property.name == "sorting_offset") {
		p_property.usage = PROPERTY_USAGE_DEFAULT;
	}
}

PackedStringArray Decal::get_configuration_warnings() const {
	PackedStringArray warnings = VisualInstance3D::get_configuration_warnings();

	if (OS::get_singleton()->get_current_rendering_method() == "gl_compatibility" || OS::get_singleton()->get_current_rendering_method() == "dummy") {
		warnings.push_back(RTR("Decals are only available when using the Forward+ or Mobile renderer."));
		return warnings;
	}

	if (textures[TEXTURE_ALBEDO].is_null() && textures[TEXTURE_NORMAL].is_null() && textures[TEXTURE_ORM].is_null() && textures[TEXTURE_EMISSION].is_null()) {
		warnings.push_back(RTR("The decal has no textures loaded into any of its texture properties, and will therefore not be visible."));
	}

	if ((textures[TEXTURE_NORMAL].is_valid() || textures[TEXTURE_ORM].is_valid()) && textures[TEXTURE_ALBEDO].is_null()) {
		warnings.push_back(RTR("The decal has a Normal and/or ORM texture, but no Albedo texture is set.\nAn Albedo texture with an alpha channel is required to blend the normal/ORM maps onto the underlying surface.\nIf you don't want the Albedo texture to be visible, set Albedo Mix to 0."));
	}

	if (cull_mask == 0) {
		warnings.push_back(RTR("The decal's Cull Mask has no bits enabled, which means the decal will not paint objects on any layer.\nTo resolve this, enable at least one bit in the Cull Mask property."));
	}

	return warnings;
}

void Decal::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_size", "size"), &Decal::set_size);
	ClassDB::bind_method(D_METHOD("get_size"), &Decal::get_size);

	ClassDB::bind_method(D_METHOD("set_texture", "type", "texture"), &Decal::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture", "type"), &Decal::get_texture);

	ClassDB::bind_method(D_METHOD("set_emission_energy", "energy"), &Decal::set_emission_energy);
	ClassDB::bind_method(D_METHOD("get_emission_energy"), &Decal::get_emission_energy);

	ClassDB::bind_method(D_METHOD("set_albedo_mix", "energy"), &Decal::set_albedo_mix);
	ClassDB::bind_method(D_METHOD("get_albedo_mix"), &Decal::get_albedo_mix);

	ClassDB::bind_method(D_METHOD("set_modulate", "color"), &Decal::set_modulate);
	ClassDB::bind_method(D_METHOD("get_modulate"), &Decal::get_modulate);

	ClassDB::bind_method(D_METHOD("set_upper_fade", "fade"), &Decal::set_upper_fade);
	ClassDB::bind_method(D_METHOD("get_upper_fade"), &Decal::get_upper_fade);

	ClassDB::bind_method(D_METHOD("set_lower_fade", "fade"), &Decal::set_lower_fade);
	ClassDB::bind_method(D_METHOD("get_lower_fade"), &Decal::get_lower_fade);

	ClassDB::bind_method(D_METHOD("set_normal_fade", "fade"), &Decal::set_normal_fade);
	ClassDB::bind_method(D_METHOD("get_normal_fade"), &Decal::get_normal_fade);

	ClassDB::bind_method(D_METHOD("set_enable_distance_fade", "enable"), &Decal::set_enable_distance_fade);
	ClassDB::bind_method(D_METHOD("is_distance_fade_enabled"), &Decal::is_distance_fade_enabled);

	ClassDB::bind_method(D_METHOD("set_distance_fade_begin", "distance"), &Decal::set_distance_fade_begin);
	ClassDB::bind_method(D_METHOD("get_distance_fade_begin"), &Decal::get_distance_fade_begin);

	ClassDB::bind_method(D_METHOD("set_distance_fade_length", "distance"), &Decal::set_distance_fade_length);
	ClassDB::bind_method(D_METHOD("get_distance_fade_length"), &Decal::get_distance_fade_length);

	ClassDB::bind_method(D_METHOD("set_cull_mask", "mask"), &Decal::set_cull_mask);
	ClassDB::bind_method(D_METHOD("get_cull_mask"), &Decal::get_cull_mask);

	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "size", PROPERTY_HINT_RANGE, "0,1024,0.001,or_greater,suffix:m"), "set_size", "get_size");

	ADD_GROUP("Textures", "texture_");
	// Only allow texture types that display correctly.
	const String texture_hint = "Texture2D,-AnimatedTexture,-AtlasTexture,-CameraTexture,-CanvasTexture,-MeshTexture,-Texture2DRD,-ViewportTexture";
	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "texture_albedo", PROPERTY_HINT_RESOURCE_TYPE, texture_hint), "set_texture", "get_texture", TEXTURE_ALBEDO);
	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "texture_normal", PROPERTY_HINT_RESOURCE_TYPE, texture_hint), "set_texture", "get_texture", TEXTURE_NORMAL);
	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "texture_orm", PROPERTY_HINT_RESOURCE_TYPE, texture_hint), "set_texture", "get_texture", TEXTURE_ORM);
	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "texture_emission", PROPERTY_HINT_RESOURCE_TYPE, texture_hint), "set_texture", "get_texture", TEXTURE_EMISSION);

	ADD_GROUP("Parameters", "");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "emission_energy", PROPERTY_HINT_RANGE, "0,16,0.01,or_greater"), "set_emission_energy", "get_emission_energy");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "modulate"), "set_modulate", "get_modulate");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "albedo_mix", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_albedo_mix", "get_albedo_mix");
	// A Normal Fade of 1.0 causes the decal to be invisible even if fully perpendicular to a surface.
	// Due to this, limit Normal Fade to 0.999.
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "normal_fade", PROPERTY_HINT_RANGE, "0,0.999,0.001"), "set_normal_fade", "get_normal_fade");

	ADD_GROUP("Vertical Fade", "");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "upper_fade", PROPERTY_HINT_EXP_EASING, "attenuation"), "set_upper_fade", "get_upper_fade");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "lower_fade", PROPERTY_HINT_EXP_EASING, "attenuation"), "set_lower_fade", "get_lower_fade");

	ADD_GROUP("Distance Fade", "distance_fade_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "distance_fade_enabled", PROPERTY_HINT_GROUP_ENABLE), "set_enable_distance_fade", "is_distance_fade_enabled");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "distance_fade_begin", PROPERTY_HINT_RANGE, "0.0,4096.0,0.01,or_greater,suffix:m"), "set_distance_fade_begin", "get_distance_fade_begin");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "distance_fade_length", PROPERTY_HINT_RANGE, "0.0,4096.0,0.01,or_greater,suffix:m"), "set_distance_fade_length", "get_distance_fade_length");

	ADD_GROUP("Cull Mask", "");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "cull_mask", PROPERTY_HINT_LAYERS_3D_RENDER), "set_cull_mask", "get_cull_mask");

	BIND_ENUM_CONSTANT(TEXTURE_ALBEDO);
	BIND_ENUM_CONSTANT(TEXTURE_NORMAL);
	BIND_ENUM_CONSTANT(TEXTURE_ORM);
	BIND_ENUM_CONSTANT(TEXTURE_EMISSION);
	BIND_ENUM_CONSTANT(TEXTURE_MAX);
}

#ifndef DISABLE_DEPRECATED
bool Decal::_set(const StringName &p_name, const Variant &p_value) {
	if (p_name == "extents") { // Compatibility with Godot 3.x.
		set_size((Vector3)p_value * 2);
		return true;
	}
	return false;
}

bool Decal::_get(const StringName &p_name, Variant &r_property) const {
	if (p_name == "extents") { // Compatibility with Godot 3.x.
		r_property = size / 2;
		return true;
	}
	return false;
}
#endif // DISABLE_DEPRECATED

Decal::Decal() {
	decal = RenderingServer::get_singleton()->decal_create();
	RS::get_singleton()->instance_set_base(get_instance(), decal);
}

Decal::~Decal() {
	ERR_FAIL_NULL(RenderingServer::get_singleton());
	RS::get_singleton()->free_rid(decal);
}
