first Kotlin version

src/main/kotlin/mods/betterfoliage/client/integration/ShadersModIntegration.kt

@@ -0,0 +1,53 @@
+package mods.betterfoliage.client.integration
+
+import cpw.mods.fml.relauncher.Side
+import cpw.mods.fml.relauncher.SideOnly
+import mods.betterfoliage.client.Client
+import mods.betterfoliage.client.config.Config
+import mods.betterfoliage.loader.Refs
+import mods.octarinecore.metaprog.allAvailable
+import net.minecraft.block.Block
+import net.minecraft.init.Blocks
+import org.apache.logging.log4j.Level.*
+
+/**
+ * Integration for ShadersMod.
+ */
+@SideOnly(Side.CLIENT)
+object ShadersModIntegration {
+
+    @JvmStatic var isPresent = false
+    @JvmStatic val tallGrassEntityData = Block.blockRegistry.getIDForObject(Blocks.tallgrass) and 65535 or (Blocks.tallgrass.renderType shl 16)
+    @JvmStatic val leavesEntityData = Block.blockRegistry.getIDForObject(Blocks.leaves) and 65535 or (Blocks.leaves.renderType shl 16)
+
+    /**
+     * Called from transformed ShadersMod code.
+     * @see mods.betterfoliage.loader.BetterFoliageTransformer
+     */
+    @JvmStatic fun getBlockIdOverride(original: Int, block: Block): Int {
+        if (Config.blocks.leaves.matchesID(original and 65535)) return leavesEntityData
+        if (Config.blocks.crops.matchesID(original and 65535)) return tallGrassEntityData
+        return original
+    }
+
+    init {
+        if (allAvailable(Refs.pushEntity_I, Refs.popEntity)) {
+            Client.log(INFO, "ShadersMod integration enabled")
+            isPresent = true
+        }
+    }
+
+    /** Quads rendered inside this block will behave as tallgrass blocks in shader programs. */
+    inline fun grass(enabled: Boolean = true, func: ()->Unit) {
+        if (isPresent && enabled) Refs.pushEntity_I.invokeStatic(tallGrassEntityData)
+        func()
+        if (isPresent && enabled) Refs.popEntity.invokeStatic()
+    }
+
+    /** Quads rendered inside this block will behave as leaf blocks in shader programs. */
+    inline fun leaves(enabled: Boolean = true, func: ()->Unit) {
+        if (isPresent && enabled) Refs.pushEntity_I.invokeStatic(leavesEntityData)
+        func()
+        if (isPresent && enabled) Refs.popEntity.invokeStatic()
+    }
+}