[WIP] move AbstractParticles

2021-05-12 12:33:05 +02:00
parent b46fdeaeef
commit 6a31adcdd8
3 changed files with 1 additions and 11 deletions
--- a/src/main/kotlin/mods/betterfoliage/render/particle/AbstractParticle.kt
+++ b/src/main/kotlin/mods/betterfoliage/render/particle/AbstractParticle.kt
@@ -0,0 +1,101 @@
+package mods.betterfoliage.render.particle
+
+import mods.betterfoliage.util.Double3
+import net.minecraft.client.MinecraftClient
+import net.minecraft.client.particle.SpriteBillboardParticle
+import net.minecraft.client.render.Camera
+import net.minecraft.client.render.VertexConsumer
+import net.minecraft.client.texture.Sprite
+import net.minecraft.client.util.math.Vector3f
+import net.minecraft.util.math.MathHelper
+import net.minecraft.world.World
+
+abstract class AbstractParticle(world: World, x: Double, y: Double, z: Double) : SpriteBillboardParticle(world, x, y, z) {
+
+    companion object {
+//        @JvmStatic val sin = Array(64) { idx -> Math.sin(PI2 / 64.0 * idx) }
+//        @JvmStatic val cos = Array(64) { idx -> Math.cos(PI2 / 64.0 * idx) }
+    }
+
+    val billboardRot = Pair(Double3.zero, Double3.zero)
+    val currentPos = Double3.zero
+    val prevPos = Double3.zero
+    val velocity = Double3.zero
+
+    override fun tick() {
+        super.tick()
+        currentPos.setTo(x, y, z)
+        prevPos.setTo(prevPosX, prevPosY, prevPosZ)
+        velocity.setTo(velocityX, velocityY, velocityZ)
+        update()
+        x = currentPos.x; y = currentPos.y; z = currentPos.z;
+        velocityX = velocity.x; velocityY = velocity.y; velocityZ = velocity.z;
+    }
+
+    /** Update particle on world tick. */
+    abstract fun update()
+
+    /** True if the particle is renderable. */
+    abstract val isValid: Boolean
+
+    /** Add the particle to the effect renderer if it is valid. */
+    fun addIfValid() { if (isValid) MinecraftClient.getInstance().particleManager.addParticle(this) }
+
+    override fun buildGeometry(vertexConsumer: VertexConsumer, camera: Camera, tickDelta: Float) {
+        renderParticleQuad(vertexConsumer, camera, tickDelta)
+    }
+
+    /**
+     * Render a particle quad.
+     *
+     * @param[tessellator] the [Tessellator] instance to use
+     * @param[tickDelta] partial tick time
+     * @param[currentPos] render position
+     * @param[prevPos] previous tick position for interpolation
+     * @param[size] particle size
+     * @param[currentAngle] viewpoint-dependent particle rotation (64 steps)
+     * @param[sprite] particle texture
+     * @param[isMirrored] mirror particle texture along V-axis
+     * @param[alpha] aplha blending
+     */
+    fun renderParticleQuad(vertexConsumer: VertexConsumer,
+                           camera: Camera,
+                           tickDelta: Float,
+                           currentPos: Double3 = this.currentPos,
+                           prevPos: Double3 = this.prevPos,
+                           size: Double = scale.toDouble(),
+                           currentAngle: Float = this.angle,
+                           prevAngle: Float = this.prevAngle,
+                           sprite: Sprite = this.sprite,
+                           alpha: Float = this.colorAlpha) {
+
+        val center = Double3.lerp(tickDelta.toDouble(), prevPos, currentPos)
+        val angle = MathHelper.lerp(tickDelta, prevAngle, currentAngle)
+        val rotation = camera.rotation.copy().apply { hamiltonProduct(Vector3f.POSITIVE_Z.getRadialQuaternion(angle)) }
+        val lightmapCoord = getColorMultiplier(tickDelta)
+
+        val coords = arrayOf(
+            Double3(-1.0, -1.0, 0.0),
+            Double3(-1.0, 1.0, 0.0),
+            Double3(1.0, 1.0, 0.0),
+            Double3(1.0, -1.0, 0.0)
+        ).map { it.rotate(rotation).mul(size).add(center).sub(camera.pos.x, camera.pos.y, camera.pos.z) }
+
+        fun renderVertex(vertex: Double3, u: Float, v: Float) = vertexConsumer
+            .vertex(vertex.x, vertex.y, vertex.z).texture(u, v)
+            .color(colorRed, colorGreen, colorBlue, alpha).light(lightmapCoord)
+            .next()
+
+        renderVertex(coords[0], sprite.maxU, sprite.maxV)
+        renderVertex(coords[1], sprite.maxU, sprite.minV)
+        renderVertex(coords[2], sprite.minU, sprite.minV)
+        renderVertex(coords[3], sprite.minU, sprite.maxV)
+    }
+
+    fun setColor(color: Int) {
+        colorBlue = (color and 255) / 256.0f
+        colorGreen = ((color shr 8) and 255) / 256.0f
+        colorRed = ((color shr 16) and 255) / 256.0f
+    }
+}
+