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/*
* SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
package moe.nea.firmament.gui.entity
import com.google.gson.Gson
import com.google.gson.JsonArray
import com.google.gson.JsonObject
import org.apache.logging.log4j.LogManager
import org.joml.Quaternionf
import org.joml.Vector3f
import kotlin.math.atan
import net.minecraft.client.gui.DrawContext
import net.minecraft.client.gui.screen.ingame.InventoryScreen
import net.minecraft.entity.Entity
import net.minecraft.entity.EntityType
import net.minecraft.entity.LivingEntity
import net.minecraft.util.Identifier
import moe.nea.firmament.util.MC
import moe.nea.firmament.util.assertNotNullOr
import moe.nea.firmament.util.iterate
import moe.nea.firmament.util.openFirmamentResource
import moe.nea.firmament.util.render.enableScissorWithTranslation
object EntityRenderer {
val fakeWorld = FakeWorld()
private fun <T : Entity> t(entityType: EntityType<T>): () -> T {
return { entityType.create(fakeWorld)!! }
}
val entityIds: Map<String, () -> LivingEntity> = mapOf(
"Zombie" to t(EntityType.ZOMBIE),
"Chicken" to t(EntityType.CHICKEN),
"Slime" to t(EntityType.SLIME),
"Wolf" to t(EntityType.WOLF),
"Skeleton" to t(EntityType.SKELETON),
"Creeper" to t(EntityType.CREEPER),
"Ocelot" to t(EntityType.OCELOT),
"Blaze" to t(EntityType.BLAZE),
"Rabbit" to t(EntityType.RABBIT),
"Sheep" to t(EntityType.SHEEP),
"Horse" to t(EntityType.HORSE),
"Eisengolem" to t(EntityType.IRON_GOLEM),
"Silverfish" to t(EntityType.SILVERFISH),
"Witch" to t(EntityType.WITCH),
"Endermite" to t(EntityType.ENDERMITE),
"Snowman" to t(EntityType.SNOW_GOLEM),
"Villager" to t(EntityType.VILLAGER),
"Guardian" to t(EntityType.GUARDIAN),
"ArmorStand" to t(EntityType.ARMOR_STAND),
"Squid" to t(EntityType.SQUID),
"Bat" to t(EntityType.BAT),
"Spider" to t(EntityType.SPIDER),
"CaveSpider" to t(EntityType.CAVE_SPIDER),
"Pigman" to t(EntityType.ZOMBIFIED_PIGLIN),
"Ghast" to t(EntityType.GHAST),
"MagmaCube" to t(EntityType.MAGMA_CUBE),
"Wither" to t(EntityType.WITHER),
"Enderman" to t(EntityType.ENDERMAN),
"Mooshroom" to t(EntityType.MOOSHROOM),
"WitherSkeleton" to t(EntityType.WITHER_SKELETON),
"Cow" to t(EntityType.COW),
"Dragon" to t(EntityType.ENDER_DRAGON),
"Player" to { makeGuiPlayer(fakeWorld) },
"Pig" to t(EntityType.PIG),
"Giant" to t(EntityType.GIANT),
)
val entityModifiers: Map<String, EntityModifier> = mapOf(
"playerdata" to ModifyPlayerSkin,
"equipment" to ModifyEquipment,
"riding" to ModifyRiding,
"charged" to ModifyCharged,
"witherdata" to ModifyWither,
"invisible" to ModifyInvisible,
"age" to ModifyAge,
"horse" to ModifyHorse,
"name" to ModifyName,
)
val logger = LogManager.getLogger("Firmament.Entity")
fun applyModifiers(entityId: String, modifiers: List<JsonObject>): LivingEntity? {
val entityType = assertNotNullOr(entityIds[entityId]) {
logger.error("Could not create entity with id $entityId")
return null
}
var entity = entityType()
for (modifierJson in modifiers) {
val modifier = assertNotNullOr(modifierJson["type"]?.asString?.let(entityModifiers::get)) {
logger.error("Unknown modifier $modifierJson")
return null
}
entity = modifier.apply(entity, modifierJson)
}
return entity
}
fun constructEntity(info: JsonObject): LivingEntity? {
val modifiers = (info["modifiers"] as JsonArray?)?.map { it.asJsonObject } ?: emptyList()
val entityType = assertNotNullOr(info["entity"]?.asString) {
logger.error("Missing entity type on entity object")
return null
}
return applyModifiers(entityType, modifiers)
}
private val gson = Gson()
fun constructEntity(location: Identifier): LivingEntity? {
return constructEntity(
gson.fromJson(
location.openFirmamentResource().bufferedReader(), JsonObject::class.java
)
)
}
fun renderEntity(
entity: LivingEntity,
renderContext: DrawContext,
posX: Int,
posY: Int,
mouseX: Float,
mouseY: Float
) {
var bottomOffset = 0.0F
var currentEntity = entity
val maxSize = entity.iterate { it.firstPassenger as? LivingEntity }
.map { it.height }
.sum()
while (true) {
currentEntity.age = MC.player?.age ?: 0
drawEntity(
renderContext,
posX,
posY,
posX + 50,
posY + 80,
(2F / maxSize * 30).toInt(),
-bottomOffset,
mouseX,
mouseY,
currentEntity
)
val next = currentEntity.firstPassenger as? LivingEntity ?: break
bottomOffset += currentEntity.getPassengerRidingPos(next).y.toFloat() * 0.75F
currentEntity = next
}
}
fun drawEntity(
context: DrawContext,
x1: Int,
y1: Int,
x2: Int,
y2: Int,
size: Int,
bottomOffset: Float,
mouseX: Float,
mouseY: Float,
entity: LivingEntity
) {
context.enableScissorWithTranslation(x1.toFloat(), y1.toFloat(), x2.toFloat(), y2.toFloat())
val centerX = (x1 + x2) / 2f
val centerY = (y1 + y2) / 2f
val targetYaw = atan(((centerX - mouseX) / 40.0f).toDouble()).toFloat()
val targetPitch = atan(((centerY - mouseY) / 40.0f).toDouble()).toFloat()
val rotateToFaceTheFront = Quaternionf().rotateZ(Math.PI.toFloat())
val rotateToFaceTheCamera = Quaternionf().rotateX(targetPitch * 20.0f * (Math.PI.toFloat() / 180))
rotateToFaceTheFront.mul(rotateToFaceTheCamera)
val oldBodyYaw = entity.bodyYaw
val oldYaw = entity.yaw
val oldPitch = entity.pitch
val oldPrevHeadYaw = entity.prevHeadYaw
val oldHeadYaw = entity.headYaw
entity.bodyYaw = 180.0f + targetYaw * 20.0f
entity.yaw = 180.0f + targetYaw * 40.0f
entity.pitch = -targetPitch * 20.0f
entity.headYaw = entity.yaw
entity.prevHeadYaw = entity.yaw
val vector3f = Vector3f(0.0f, entity.height / 2.0f + bottomOffset, 0.0f)
InventoryScreen.drawEntity(
context,
centerX,
centerY,
size,
vector3f,
rotateToFaceTheFront,
rotateToFaceTheCamera,
entity
)
entity.bodyYaw = oldBodyYaw
entity.yaw = oldYaw
entity.pitch = oldPitch
entity.prevHeadYaw = oldPrevHeadYaw
entity.headYaw = oldHeadYaw
context.disableScissor()
}
}
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