[WIP] major rewrite, grass and leaves working already

src/main/kotlin/mods/betterfoliage/render/lighting/ForgeVertexLighter.kt

@@ -0,0 +1,33 @@
+package mods.betterfoliage.render.lighting
+
+interface ForgeVertexLighterAccess {
+    var vertexLighter: ForgeVertexLighter
+}
+
+interface ForgeVertexLighter {
+    fun updateVertexLightmap(normal: FloatArray, lightmap: FloatArray, x: Float, y: Float, z: Float)
+    fun updateVertexColor(normal: FloatArray, color: FloatArray, x: Float, y: Float, z: Float, tint: Float, multiplier: Int)
+}
+
+fun ForgeVertexLighter.grass() = object: ForgeVertexLighter {
+    override fun updateVertexLightmap(normal: FloatArray, lightmap: FloatArray, x: Float, y: Float, z: Float) {
+        this@grass.updateVertexLightmap(normal, lightmap, x  * 0.5f, 1.0f, z * 0.5f)
+    }
+
+    override fun updateVertexColor(normal: FloatArray, color: FloatArray, x: Float, y: Float, z: Float, tint: Float, multiplier: Int)  {
+        this@grass.updateVertexColor(normal, color, x  * 0.5f, 1.0f, z * 0.5f, tint, multiplier
+        )
+    }
+}
+
+fun ForgeVertexLighter.grassSimple() = object: ForgeVertexLighter {
+    val normalUp = floatArrayOf(0.0f, 1.0f, 0.0f, 0.0f)
+    override fun updateVertexLightmap(normal: FloatArray, lightmap: FloatArray, x: Float, y: Float, z: Float) {
+        this@grassSimple.updateVertexLightmap(normalUp, lightmap, 0.0f, 1.0f, 0.0f)
+    }
+
+    override fun updateVertexColor(normal: FloatArray, color: FloatArray, x: Float, y: Float, z: Float, tint: Float, multiplier: Int)  {
+        this@grassSimple.updateVertexColor(normalUp, color, 0.0f, 1.0f, 0.0f, tint, multiplier
+        )
+    }
+}