Minecraft Forums

Ok, so the aim of this tutorial is to modify the humble house that appears in your MCPE villages.

Functions we are going to use:

VillagePiece::placeBlock(BlockSource*, FullBlock, int, int, int, BoundingBox const&);
VillagePiece::generateBox(BlockSource*, BoundingBox const&, int, int, int, int, int, int, FullBlock, FullBlock, bool);
VillagePiece::postProcess(BlockSource*, Random&, BoundingBox const&);

So basically, VillagePiece::placeBlock places a block for the structure, VillagePiece::generateBox generates a box, as VillagePiece::postProcess is the function where the structure is created.

Once you've set up your headers (find them at https://github.com/minecraftmuse3/ExampleVillageGen), we are going to want to include our header files into the main project file.

#include <jni.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <Substrate.h>
 
#include "mcpe/CommonTypes.h"
#include "mcpe/block/Block.h"
#include "mcpe/structure/village/components/SimpleHouse.h"

Next you're going to want to set up your functions to replace the existing ones

[/p]
[p]void (*_SimpleHouse$postProcess)(SimpleHouse* self, BlockSource*, Random&, BoundingBox const&);
void SimpleHouse$postProcess(SimpleHouse* self, BlockSource* region, Random& rand, BoundingBox const& bounds) {
 self->generateBox(region, bounds, 0, 0, 0, 3, 3, 3, {Block::mBrick->blockId, 0}, {Block::mBrick->blockId}, false);
 self->generateBox(region, bounds, 0, 3, 0, 3, 6, 3, {Block::mWoodPlanks->blockId, 0}, {Block::mWoodPlanks->blockId}, false);
}[/p]
[p]

Lastly, you're going to want to hook your functions

JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
 
        void* handle = dlopen("libminecraftpe.so", RTLD_LAZY);
        void* SimpleHouse$postProcess_ = dlsym(handle, "_ZN11SimpleHouse11postProcessEP11BlockSourceR6RandomRK11BoundingBox");

        MSHookFunction(SimpleHouse$postProcess_, (void*) &SimpleHouse$postProcess, (void**) &_SimpleHouse$postProcess);
 
        return JNI_VERSION_1_2;
}

Full file:

[/p]
[p]#include <jni.h>
#include <dlfcn.h>
#include <Substrate.h>[/p]

[p]#include "mcpe/CommonTypes.h"
#include "mcpe/block/Block.h"
#include "mcpe/structure/village/components/SimpleHouse.h"[/p]

[p]void (*_SimpleHouse$postProcess)(SimpleHouse* self, BlockSource*, Random&, BoundingBox const&);
void SimpleHouse$postProcess(SimpleHouse* self, BlockSource* region, Random& rand, BoundingBox const& bounds) {
        //We generate a basic wall
        self->generateBox(region, bounds, 0, 0, 0, 4, 4, 0, {Block::mBrick->blockId, 0}, {Block::mBrick->blockId}, false);
        self->generateBox(region, bounds, 1, 1, 0, 3, 3, 0, {Block::mWoodPlanks->blockId, 0}, {Block::mWoodPlanks->blockId}, false);
}[/p]

[p]JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
 
        void* handle = dlopen("libminecraftpe.so", RTLD_LAZY);
        void* SimpleHouse$postProcess_ = dlsym(handle, "_ZN11SimpleHouse11postProcessEP11BlockSourceR6RandomRK11BoundingBox");[/p]
[p]
        MSHookFunction(SimpleHouse$postProcess_, (void*) &SimpleHouse$postProcess, (void**) &_SimpleHouse$postProcess);[/p]

[p]        return JNI_VERSION_1_2;
}[/p]
[p]

All you need to do now is load up a NEW world and find a village!

Results:

Here is a hut that I made using this code:

A single, solitary stone block: