protect against render buffer underruns

src/main/kotlin/mods/octarinecore/client/render/ModelRenderer.kt

@@ -1,12 +1,12 @@
 package mods.octarinecore.client.render
 
-import mods.octarinecore.client.resource.resourceManager
 import mods.octarinecore.common.*
 import net.minecraft.client.Minecraft
 import net.minecraft.client.renderer.WorldRenderer
 import net.minecraft.client.renderer.texture.TextureAtlasSprite
 import net.minecraft.util.EnumFacing
 import net.minecraft.util.EnumFacing.*
+import java.lang.Math.max
 
 class ModelRenderer() : ShadingContext() {
 
@@ -39,6 +39,9 @@ class ModelRenderer() : ShadingContext() {
         rotation = rot
         aoEnabled = Minecraft.isAmbientOcclusionEnabled()
 
+        // make sure we have space in the buffer for our quads plus one
+        worldRenderer.ensureSpaceForQuads(model.quads.size + 1)
+
         model.quads.forEachIndexed { quadIdx, quad ->
             val drawIcon = icon(this, quadIdx, quad)
             if (drawIcon != null) {
@@ -142,6 +145,13 @@ class RenderVertex() {
     }
 }
 
+fun WorldRenderer.ensureSpaceForQuads(num: Int) {
+    rawIntBuffer.position(rawBufferIndex)
+    (num * vertexFormat.nextOffset).let {
+        if (it > rawIntBuffer.remaining()) growBuffer(max(it, 524288))
+    }
+}
+
 val allFaces: (EnumFacing) -> Boolean = { true }
 val topOnly: (EnumFacing) -> Boolean = { it == UP }
 

src/main/resources/META-INF/BetterFoliage_at.cfg

@@ -5,3 +5,7 @@ public net.minecraft.client.renderer.BlockModelRenderer$AmbientOcclusionFace fie
 public net.minecraft.client.resources.model.ModelBakery field_177610_k # blockModelShapes
 
 public net.minecraft.client.renderer.block.statemap.BlockStateMapper field_178450_a # blockStateMap
+
+public net.minecraft.client.renderer.WorldRenderer field_178999_b # rawIntBuffer
+public net.minecraft.client.renderer.WorldRenderer func_178983_e(I)V # growBuffer
+public net.minecraft.client.renderer.WorldRenderer field_179008_i # rawBufferIndex