some rework / cleanup with full rework of culling to work by parts. no self culling yet? still missing work on connected textures

src/main/java/fr/adrien1106/reframed/mixin/render/TerrainRenderContextMixin.java

@@ -0,0 +1,41 @@
+package fr.adrien1106.reframed.mixin.render;
+
+import fr.adrien1106.reframed.client.model.MultiRetexturableModel;
+import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.IMultipartBakedModelMixin;
+import net.fabricmc.fabric.impl.client.indigo.renderer.render.AbstractBlockRenderContext;
+import net.fabricmc.fabric.impl.client.indigo.renderer.render.TerrainRenderContext;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.util.math.BlockPos;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.List;
+
+@Mixin(TerrainRenderContext.class)
+public abstract class TerrainRenderContextMixin extends AbstractBlockRenderContext {
+
+    @Inject(method = "tessellateBlock", at = @At(
+            value = "INVOKE",
+            target = "Lnet/fabricmc/fabric/impl/client/indigo/renderer/aocalc/AoCalculator;clear()V",
+            shift = At.Shift.AFTER
+        ), cancellable = true)
+    private void renderMultipleModels(BlockState state, BlockPos pos, BakedModel wrapper, MatrixStack matrixStack, CallbackInfo ci) {
+        if (!(wrapper instanceof IMultipartBakedModelMixin wrapped)
+            || !(wrapped.getModel(state) instanceof MultiRetexturableModel retexturing_model)) return;
+
+        List<BakedModel> models = retexturing_model.models();
+        int i = 0;
+        for (BakedModel bakedModel : models) {
+            i++;
+            aoCalc.clear();
+            ((IBlockRenderInfoMixin) blockInfo).prepareForBlock(state, pos, bakedModel.useAmbientOcclusion(), i);
+            bakedModel.emitBlockQuads(blockInfo.blockView, blockInfo.blockState, blockInfo.blockPos, blockInfo.randomSupplier, this);
+        }
+        ci.cancel();
+    }
+}