improved hitbox rendering

doc/rendering/Entities.md

@@ -52,18 +52,28 @@ Entities are always designed without any rotation (i.e. `yaw`=`0`)
 - update visible and not visible
     - entity name is also visible through walls, rest not
     - also with frustum (no need to update renderers that are out of the frustum)
+    - -> handle occlusion differently from visibility
 - option to turn on/off "features"
 - how to register entity models?
     - loop over all entity (and block entity) types and register?
+- store entities in octree like structure
+    - ways faster collisions with them -> physics
+    - way faster getInRadius -> particles, maybe entities in the future
 
 ## Hitboxes
 
 - Create line mesh with default aabb
-  - interpolate aabb if size changes (e.g. changing pose for players)
-  - how about rendering velocity or view?
+    - interpolate
+        - aabb (not at all, taken from renderInfo)
+        - color: 0.5s
+        - velocity (ticks)
+        - direction (taken from renderInfo)
+        - eye height (taken from renderInfo)
+    - they must alight with the matrix handler -> mustn't be a frame too late/early
 - Store offset and rotation as uniform
 - Make hitbox a default feature of entity renderer
-- draw as opaque
+- highest priority (enables cheap gpu clipping)
+- dynamic enabling and disabling (hitbox manager, keybinding)
 
 ## Tests
 

src/main/java/de/bixilon/minosoft/gui/rendering/entities/hitbox/HitboxData.kt

@@ -14,13 +14,17 @@
 package de.bixilon.minosoft.gui.rendering.entities.hitbox
 
 import de.bixilon.kotlinglm.vec3.Vec3
-import de.bixilon.minosoft.data.entities.EntityRotation
-import de.bixilon.minosoft.data.registries.shapes.aabb.AABB
+import de.bixilon.minosoft.data.entities.entities.Entity
+import de.bixilon.minosoft.data.text.formatting.color.ChatColors
 import de.bixilon.minosoft.data.text.formatting.color.RGBColor
+import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3Util.EMPTY_INSTANCE
 
 data class HitboxData(
-    val aabb: AABB,
-    val color: RGBColor,
-    val velocity: Vec3?,
-    val rotation: EntityRotation,
-)
+    var color: RGBColor = ChatColors.WHITE,
+    var velocity: Vec3 = Vec3.EMPTY_INSTANCE,
+) {
+
+    fun update(entity: Entity) {
+
+    }
+}

src/main/java/de/bixilon/minosoft/gui/rendering/entities/hitbox/HitboxFeature.kt

@@ -13,31 +13,98 @@
 
 package de.bixilon.minosoft.gui.rendering.entities.hitbox
 
+import de.bixilon.kotlinglm.vec3.Vec3
+import de.bixilon.kotlinglm.vec3.Vec3i
+import de.bixilon.minosoft.data.entities.EntityRotation
+import de.bixilon.minosoft.data.registries.shapes.aabb.AABB
 import de.bixilon.minosoft.data.text.formatting.color.ChatColors
 import de.bixilon.minosoft.gui.rendering.entities.feature.EntityRenderFeature
 import de.bixilon.minosoft.gui.rendering.entities.renderer.EntityRenderer
 import de.bixilon.minosoft.gui.rendering.util.mesh.LineMesh
 import de.bixilon.minosoft.gui.rendering.util.mesh.Mesh
+import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3Util.EMPTY
 
 class HitboxFeature(renderer: EntityRenderer<*>) : EntityRenderFeature(renderer) {
-    private val shader = renderer.renderer.context.shaders.genericColorShader
+    private val manager = renderer.renderer.hitbox
     private var mesh: LineMesh? = null
 
+    private var aabb = AABB.EMPTY
+    private var eyePosition = Vec3.EMPTY
+    private var rotation = EntityRotation.EMPTY
+
+    private val data = HitboxData()
+    private var data0 = HitboxData()
+    private var data1 = HitboxData()
+
+
     override fun reset() {
         unload()
     }
 
     override fun update(millis: Long) {
+        if (!manager.enabled) return unload()
+
+        val offset = renderer.renderer.context.camera.offset.offset
+
+        val update = updateRenderInfo(offset) or interpolate(millis)
+
+        if (this.mesh != null && !update) return
+
+        updateMesh()
+    }
+
+
+    private fun updateRenderInfo(offset: Vec3i): Boolean {
+        var changes = 0
+
+        val renderInfo = renderer.entity.renderInfo
+        val aabb = renderInfo.cameraAABB + -offset
+        val eyePosition = Vec3(renderInfo.eyePosition - offset)
+        val rotation = renderInfo.rotation
+
+        if (aabb != this.aabb) {
+            this.aabb = aabb; changes++
+        }
+        if (eyePosition != this.eyePosition) {
+            this.eyePosition = eyePosition; changes++
+        }
+        if (rotation != this.rotation) {
+            this.rotation = rotation; changes++
+        }
+
+        return changes > 0
+    }
+
+    private fun interpolate(millis: Long): Boolean {
+        // TODO: interpolate color in 5 ticks and velocity per tick
+        return false
+    }
+
+    private fun updateMesh() {
         unload()
         val mesh = LineMesh(renderer.renderer.context)
-        mesh.drawLazyAABB(renderer.entity.renderInfo.cameraAABB, renderer.entity.hitboxColor ?: ChatColors.WHITE)
+
+        if (manager.profile.lazy) {
+            mesh.drawLazyAABB(aabb, data.color)
+        } else {
+            mesh.drawAABB(aabb, color = data.color)
+        }
+
+        val center = Vec3(aabb.center)
+        if (data.velocity.length2() > 0.003f) {
+            mesh.drawLine(center, center + data.velocity * 15.0f, color = ChatColors.YELLOW)
+        }
+
+        mesh.drawLine(eyePosition, eyePosition + rotation.front * 5.0f, color = ChatColors.BLUE)
+
+        this.mesh = mesh
     }
 
 
     override fun draw() {
         val mesh = this.mesh ?: return
         if (mesh.state != Mesh.MeshStates.LOADED) mesh.load()
-        shader.use()
+        manager.shader.use()
         mesh.draw()
     }
 

src/main/java/de/bixilon/minosoft/gui/rendering/entities/hitbox/HitboxManager.kt

@@ -22,7 +22,9 @@ import de.bixilon.minosoft.gui.rendering.entities.EntitiesRenderer
 import de.bixilon.minosoft.util.KUtil.format
 
 class HitboxManager(private val renderer: EntitiesRenderer) {
-    private val profile = renderer.profile.hitbox
+    val profile = renderer.profile.hitbox
+    val shader = renderer.context.shaders.genericColorShader
+
     var enabled = profile.enabled
 
 

src/main/java/de/bixilon/minosoft/gui/rendering/entities/visibility/EntityVisibility.kt

@@ -19,6 +19,5 @@ class EntityVisibility(val renderer: EntityRenderer<*>) {
     val visible: Boolean = true
 
     fun update(force: Boolean) {
-        TODO()
     }
 }