first Kotlin version

src/main/kotlin/mods/betterfoliage/client/texture/GrassGenerator.kt

@@ -0,0 +1,35 @@
+package mods.betterfoliage.client.texture
+
+import mods.octarinecore.client.resource.*
+import net.minecraft.util.ResourceLocation
+import java.awt.image.BufferedImage
+
+/**
+ * Generate Short Grass textures from [Blocks.tallgrass] block textures.
+ * The bottom 3/8 of the base texture is chopped off.
+ *
+ * @param[domain] Resource domain of generator
+ */
+class GrassGenerator(domain: String) : TextureGenerator(domain) {
+
+    override fun generate(params: ParameterList): BufferedImage? {
+        val target = targetResource(params)!!
+        val isSnowed = params["snowed"]?.toBoolean() ?: false
+
+        val baseTexture = resourceManager[target.second]?.loadImage() ?: return null
+
+        // draw bottom half of texture
+        val result = BufferedImage(baseTexture.width, baseTexture.height, BufferedImage.TYPE_4BYTE_ABGR)
+        val graphics = result.createGraphics()
+        graphics.drawImage(baseTexture, 0, 3 * baseTexture.height / 8, null)
+
+        // blend with white if snowed
+        if (isSnowed && target.first == ResourceType.COLOR) {
+            for (x in 0..result.width - 1) for (y in 0..result.height - 1) {
+                result[x, y] = blendRGB(result[x, y], 16777215, 2, 3)
+            }
+        }
+
+        return result
+    }
+}