init

third_party/noita_random/wang/MurmurHash3.cpp

@@ -0,0 +1,334 @@
+//-----------------------------------------------------------------------------
+// MurmurHash3 was written by Austin Appleby, and is placed in the public
+// domain. The author hereby disclaims copyright to this source code.
+
+// Note - The x86 and x64 versions do _not_ produce the same results, as the
+// algorithms are optimized for their respective platforms. You can still
+// compile and run any of them on any platform, but your performance with the
+// non-native version will be less than optimal.
+
+#include "MurmurHash3.h"
+
+//-----------------------------------------------------------------------------
+// Platform-specific functions and macros
+
+// Microsoft Visual Studio
+
+#if defined(_MSC_VER)
+
+#define FORCE_INLINE	__forceinline
+
+#include <stdlib.h>
+
+#define ROTL32(x,y)	_rotl(x,y)
+#define ROTL64(x,y)	_rotl64(x,y)
+
+#define BIG_CONSTANT(x) (x)
+
+// Other compilers
+
+#else	// defined(_MSC_VER)
+
+#define	FORCE_INLINE inline __attribute__((always_inline))
+
+inline uint32_t rotl32 ( uint32_t x, int8_t r )
+{
+  return (x << r) | (x >> (32 - r));
+}
+
+inline uint64_t rotl64 ( uint64_t x, int8_t r )
+{
+  return (x << r) | (x >> (64 - r));
+}
+
+#define	ROTL32(x,y)	rotl32(x,y)
+#define ROTL64(x,y)	rotl64(x,y)
+
+#define BIG_CONSTANT(x) (x##LLU)
+
+#endif // !defined(_MSC_VER)
+
+//-----------------------------------------------------------------------------
+// Block read - if your platform needs to do endian-swapping or can only
+// handle aligned reads, do the conversion here
+
+FORCE_INLINE uint32_t getblock32 ( const uint32_t * p, int i )
+{
+  return p[i];
+}
+
+FORCE_INLINE uint64_t getblock64 ( const uint64_t * p, int i )
+{
+  return p[i];
+}
+
+//-----------------------------------------------------------------------------
+// Finalization mix - force all bits of a hash block to avalanche
+
+FORCE_INLINE uint32_t fmix32 ( uint32_t h )
+{
+  h ^= h >> 16;
+  h *= 0x85ebca6b;
+  h ^= h >> 13;
+  h *= 0xc2b2ae35;
+  h ^= h >> 16;
+
+  return h;
+}
+
+//----------
+
+FORCE_INLINE uint64_t fmix64 ( uint64_t k )
+{
+  k ^= k >> 33;
+  k *= BIG_CONSTANT(0xff51afd7ed558ccd);
+  k ^= k >> 33;
+  k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);
+  k ^= k >> 33;
+
+  return k;
+}
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x86_32 ( const void * key, int len,
+                          uint32_t seed, void * out )
+{
+  const uint8_t * data = (const uint8_t*)key;
+  const int nblocks = len / 4;
+
+  uint32_t h1 = seed;
+
+  const uint32_t c1 = 0xcc9e2d51;
+  const uint32_t c2 = 0x1b873593;
+
+  //----------
+  // body
+
+  const uint32_t * blocks = (const uint32_t *)(data + nblocks*4);
+
+  for(int i = -nblocks; i; i++)
+  {
+    uint32_t k1 = getblock32(blocks,i);
+
+    k1 *= c1;
+    k1 = ROTL32(k1,15);
+    k1 *= c2;
+
+    h1 ^= k1;
+    h1 = ROTL32(h1,13);
+    h1 = h1*5+0xe6546b64;
+  }
+
+  //----------
+  // tail
+
+  const uint8_t * tail = (const uint8_t*)(data + nblocks*4);
+
+  uint32_t k1 = 0;
+
+  switch(len & 3)
+  {
+  case 3: k1 ^= tail[2] << 16;
+  case 2: k1 ^= tail[1] << 8;
+  case 1: k1 ^= tail[0];
+          k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
+  };
+
+  //----------
+  // finalization
+
+  h1 ^= len;
+
+  h1 = fmix32(h1);
+
+  *(uint32_t*)out = h1;
+}
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x86_128 ( const void * key, const int len,
+                           uint32_t seed, void * out )
+{
+  const uint8_t * data = (const uint8_t*)key;
+  const int nblocks = len / 16;
+
+  uint32_t h1 = seed;
+  uint32_t h2 = seed;
+  uint32_t h3 = seed;
+  uint32_t h4 = seed;
+
+  const uint32_t c1 = 0x239b961b;
+  const uint32_t c2 = 0xab0e9789;
+  const uint32_t c3 = 0x38b34ae5;
+  const uint32_t c4 = 0xa1e38b93;
+
+  //----------
+  // body
+
+  const uint32_t * blocks = (const uint32_t *)(data + nblocks*16);
+
+  for(int i = -nblocks; i; i++)
+  {
+    uint32_t k1 = getblock32(blocks,i*4+0);
+    uint32_t k2 = getblock32(blocks,i*4+1);
+    uint32_t k3 = getblock32(blocks,i*4+2);
+    uint32_t k4 = getblock32(blocks,i*4+3);
+
+    k1 *= c1; k1  = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
+
+    h1 = ROTL32(h1,19); h1 += h2; h1 = h1*5+0x561ccd1b;
+
+    k2 *= c2; k2  = ROTL32(k2,16); k2 *= c3; h2 ^= k2;
+
+    h2 = ROTL32(h2,17); h2 += h3; h2 = h2*5+0x0bcaa747;
+
+    k3 *= c3; k3  = ROTL32(k3,17); k3 *= c4; h3 ^= k3;
+
+    h3 = ROTL32(h3,15); h3 += h4; h3 = h3*5+0x96cd1c35;
+
+    k4 *= c4; k4  = ROTL32(k4,18); k4 *= c1; h4 ^= k4;
+
+    h4 = ROTL32(h4,13); h4 += h1; h4 = h4*5+0x32ac3b17;
+  }
+
+  //----------
+  // tail
+
+  const uint8_t * tail = (const uint8_t*)(data + nblocks*16);
+
+  uint32_t k1 = 0;
+  uint32_t k2 = 0;
+  uint32_t k3 = 0;
+  uint32_t k4 = 0;
+
+  switch(len & 15)
+  {
+  case 15: k4 ^= tail[14] << 16;
+  case 14: k4 ^= tail[13] << 8;
+  case 13: k4 ^= tail[12] << 0;
+           k4 *= c4; k4  = ROTL32(k4,18); k4 *= c1; h4 ^= k4;
+
+  case 12: k3 ^= tail[11] << 24;
+  case 11: k3 ^= tail[10] << 16;
+  case 10: k3 ^= tail[ 9] << 8;
+  case  9: k3 ^= tail[ 8] << 0;
+           k3 *= c3; k3  = ROTL32(k3,17); k3 *= c4; h3 ^= k3;
+
+  case  8: k2 ^= tail[ 7] << 24;
+  case  7: k2 ^= tail[ 6] << 16;
+  case  6: k2 ^= tail[ 5] << 8;
+  case  5: k2 ^= tail[ 4] << 0;
+           k2 *= c2; k2  = ROTL32(k2,16); k2 *= c3; h2 ^= k2;
+
+  case  4: k1 ^= tail[ 3] << 24;
+  case  3: k1 ^= tail[ 2] << 16;
+  case  2: k1 ^= tail[ 1] << 8;
+  case  1: k1 ^= tail[ 0] << 0;
+           k1 *= c1; k1  = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
+  };
+
+  //----------
+  // finalization
+
+  h1 ^= len; h2 ^= len; h3 ^= len; h4 ^= len;
+
+  h1 += h2; h1 += h3; h1 += h4;
+  h2 += h1; h3 += h1; h4 += h1;
+
+  h1 = fmix32(h1);
+  h2 = fmix32(h2);
+  h3 = fmix32(h3);
+  h4 = fmix32(h4);
+
+  h1 += h2; h1 += h3; h1 += h4;
+  h2 += h1; h3 += h1; h4 += h1;
+
+  ((uint32_t*)out)[0] = h1;
+  ((uint32_t*)out)[1] = h2;
+  ((uint32_t*)out)[2] = h3;
+  ((uint32_t*)out)[3] = h4;
+}
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x64_128 ( const void * key, const int len,
+                           const uint32_t seed, void * out )
+{
+  const uint8_t * data = (const uint8_t*)key;
+  const int nblocks = len / 16;
+
+  uint64_t h1 = seed;
+  uint64_t h2 = seed;
+
+  const uint64_t c1 = BIG_CONSTANT(0x87c37b91114253d5);
+  const uint64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f);
+
+  //----------
+  // body
+
+  const uint64_t * blocks = (const uint64_t *)(data);
+
+  for(int i = 0; i < nblocks; i++)
+  {
+    uint64_t k1 = getblock64(blocks,i*2+0);
+    uint64_t k2 = getblock64(blocks,i*2+1);
+
+    k1 *= c1; k1  = ROTL64(k1,31); k1 *= c2; h1 ^= k1;
+
+    h1 = ROTL64(h1,27); h1 += h2; h1 = h1*5+0x52dce729;
+
+    k2 *= c2; k2  = ROTL64(k2,33); k2 *= c1; h2 ^= k2;
+
+    h2 = ROTL64(h2,31); h2 += h1; h2 = h2*5+0x38495ab5;
+  }
+
+  //----------
+  // tail
+
+  const uint8_t * tail = (const uint8_t*)(data + nblocks*16);
+
+  uint64_t k1 = 0;
+  uint64_t k2 = 0;
+
+  switch(len & 15)
+  {
+  case 15: k2 ^= ((uint64_t)tail[14]) << 48;
+  case 14: k2 ^= ((uint64_t)tail[13]) << 40;
+  case 13: k2 ^= ((uint64_t)tail[12]) << 32;
+  case 12: k2 ^= ((uint64_t)tail[11]) << 24;
+  case 11: k2 ^= ((uint64_t)tail[10]) << 16;
+  case 10: k2 ^= ((uint64_t)tail[ 9]) << 8;
+  case  9: k2 ^= ((uint64_t)tail[ 8]) << 0;
+           k2 *= c2; k2  = ROTL64(k2,33); k2 *= c1; h2 ^= k2;
+
+  case  8: k1 ^= ((uint64_t)tail[ 7]) << 56;
+  case  7: k1 ^= ((uint64_t)tail[ 6]) << 48;
+  case  6: k1 ^= ((uint64_t)tail[ 5]) << 40;
+  case  5: k1 ^= ((uint64_t)tail[ 4]) << 32;
+  case  4: k1 ^= ((uint64_t)tail[ 3]) << 24;
+  case  3: k1 ^= ((uint64_t)tail[ 2]) << 16;
+  case  2: k1 ^= ((uint64_t)tail[ 1]) << 8;
+  case  1: k1 ^= ((uint64_t)tail[ 0]) << 0;
+           k1 *= c1; k1  = ROTL64(k1,31); k1 *= c2; h1 ^= k1;
+  };
+
+  //----------
+  // finalization
+
+  h1 ^= len; h2 ^= len;
+
+  h1 += h2;
+  h2 += h1;
+
+  h1 = fmix64(h1);
+  h2 = fmix64(h2);
+
+  h1 += h2;
+  h2 += h1;
+
+  ((uint64_t*)out)[0] = h1;
+  ((uint64_t*)out)[1] = h2;
+}
+
+//-----------------------------------------------------------------------------

third_party/noita_random/wang/MurmurHash3.h

@@ -0,0 +1,37 @@
+//-----------------------------------------------------------------------------
+// MurmurHash3 was written by Austin Appleby, and is placed in the public
+// domain. The author hereby disclaims copyright to this source code.
+
+#ifndef _MURMURHASH3_H_
+#define _MURMURHASH3_H_
+
+//-----------------------------------------------------------------------------
+// Platform-specific functions and macros
+
+// Microsoft Visual Studio
+
+#if defined(_MSC_VER) && (_MSC_VER < 1600)
+
+typedef unsigned char uint8_t;
+typedef unsigned int uint32_t;
+typedef unsigned __int64 uint64_t;
+
+// Other compilers
+
+#else	// defined(_MSC_VER)
+
+#include <stdint.h>
+
+#endif // !defined(_MSC_VER)
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x86_32  ( const void * key, int len, uint32_t seed, void * out );
+
+void MurmurHash3_x86_128 ( const void * key, int len, uint32_t seed, void * out );
+
+void MurmurHash3_x64_128 ( const void * key, int len, uint32_t seed, void * out );
+
+//-----------------------------------------------------------------------------
+
+#endif // _MURMURHASH3_H_

third_party/noita_random/wang/pix.cpp

@@ -0,0 +1,105 @@
+#pragma once
+
+#include "../noita_random.cpp"
+
+const unsigned long COLOR_PURPLE = 0x7f007f;
+const unsigned long COLOR_RED = 0xff0000;
+const unsigned long COLOR_BLACK = 0x000000;
+const unsigned long COLOR_WHITE = 0xffffff;
+const unsigned long COLOR_YELLOW = 0xffff00;
+
+// Extra traversable colors
+const unsigned long COLOR_COFFEE = 0xc0ffee;
+const unsigned long COLOR_FROZEN_VAULT_MINT = 0xcff7c8;
+const unsigned long COLOR_HELL_GREEN = 0x8aff80;
+
+unsigned long createRGB(const unsigned char r, const unsigned char g, const unsigned char b)
+{
+   return ((r & 0xff) << 16) + ((g & 0xff) << 8) + (b & 0xff);
+}
+
+unsigned long createRGBA(const unsigned char r, const unsigned char g, const unsigned char b, const unsigned char a)
+{
+   return ((r & 0xff) << 24) | ((g & 0xff) << 16) | ((b & 0xff) << 8) | (a & 0xff);
+}
+
+unsigned long getPos(const uint w, const uint s, const uint x, const uint y)
+{
+   return s * (w * y + x);
+}
+
+unsigned long getPixelColor(const unsigned char *map, unsigned long pos)
+{
+   unsigned char r = map[pos];
+   unsigned char g = map[pos + 1];
+   unsigned char b = map[pos + 2];
+   return createRGB(r, g, b);
+}
+
+unsigned long getPixelColor(const unsigned char *map, const uint w, const uint x, const uint y)
+{
+   unsigned long pos = getPos(w, 3, x, y);
+   return getPixelColor(map, pos);
+}
+
+bool ShadeOfGrey(const unsigned long color, const unsigned char limit)
+{
+   unsigned char r = (color >> 16) & 0xFF;
+   unsigned char g = (color >> 8) & 0xFF;
+   unsigned char b = color & 0xFF;
+
+   return r <= limit && (r == g) && (g == b) && color != COLOR_BLACK && color != COLOR_WHITE;
+}
+
+bool isRGBATransparent(const unsigned long color)
+{
+   unsigned char a = color & 0xFF;
+   return a == 0;
+}
+
+unsigned long getRGBAPixelColor(const unsigned char *map, unsigned long pos)
+{
+   unsigned char r = map[pos];
+   unsigned char g = map[pos + 1];
+   unsigned char b = map[pos + 2];
+   unsigned char a = map[pos + 3];
+   return createRGBA(r, g, b, a);
+}
+
+unsigned long getRGBAPixelColor(const unsigned char *map, const uint w, const uint x, const uint y)
+{
+   unsigned long pos = getPos(w, 4, x, y);
+   return getRGBAPixelColor(map, pos);
+}
+
+void setPixelColor(unsigned char *map, unsigned long pos, unsigned long color)
+{
+   unsigned char r = ((color >> 16) & 0xff);
+   unsigned char g = ((color >> 8) & 0xff);
+   unsigned char b = ((color) & 0xff);
+   map[pos] = r;
+   map[pos + 1] = g;
+   map[pos + 2] = b;
+}
+void setRGBAPixelColor(unsigned char *map, unsigned long pos, unsigned long color)
+{
+   unsigned char r = ((color >> 24) & 0xff);
+   unsigned char g = ((color >> 16) & 0xff);
+   unsigned char b = ((color >> 8) & 0xff);
+   unsigned char a = ((color) & 0xff);
+   map[pos] = r;
+   map[pos + 1] = g;
+   map[pos + 2] = b;
+   map[pos + 3] = a;
+}
+
+void setPixelColor(unsigned char *map, uint w, uint x, uint y, unsigned long color)
+{
+   unsigned long pos = getPos(w, 3, x, y);
+   setPixelColor(map, pos, color);
+}
+void setRGBAPixelColor(unsigned char *map, uint w, uint x, uint y, unsigned long color)
+{
+   unsigned long pos = getPos(w, 4, x, y);
+   setRGBAPixelColor(map, pos, color);
+}

third_party/noita_random/wang/png.cpp

@@ -0,0 +1,87 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdlib.h>
+
+void zero_out(uint8_t *data, uint l)
+{
+  if (data == NULL)
+  {
+    return;
+  }
+  for (uint i = 0; i < l; i += 4)
+  {
+    uint8_t r = data[i + 0];
+    uint8_t g = data[i + 1];
+    uint8_t b = data[i + 2];
+    uint8_t a = data[i + 3];
+    if (a == 0 && r == 255 && g == 255 && b == 255)
+    {
+      data[i + 0] = 0;
+      data[i + 1] = 0;
+      data[i + 2] = 0;
+      data[i + 3] = 0;
+    }
+  }
+}
+
+struct image
+{
+  int width;
+  int height;
+  int channels;
+  stbi_uc *image;
+};
+
+image load_png_bytes(const unsigned char *data, int len)
+{
+  int width = 0;
+  int height = 0;
+  int channels = 0;
+  stbi_uc *img = stbi_load_from_memory(data, len, &width, &height, &channels, 4);
+  if (img == NULL)
+  {
+    return image{0, 0, 0, NULL};
+  }
+
+  channels = 4;
+  zero_out(img, width * height * channels);
+  return image{width, height, channels, img};
+}
+
+void free_png_image(image *img)
+{
+  if (img == NULL)
+  {
+    return;
+  }
+  stbi_image_free(img->image);
+  img->image = NULL;
+  img->width = 0;
+  img->height = 0;
+  img->channels = 0;
+}
+
+void scaleImage(unsigned char *src, uint src_width, uint src_height, unsigned char *dest, unsigned char scale)
+{
+    int dest_width = src_width * scale;
+    int dest_height = src_height * scale;
+
+    for (int y = 0; y < dest_height; y++)
+    {
+        int src_y = y / scale;
+
+        for (int x = 0; x < dest_width; x++)
+        {
+            int src_x = x / scale;
+
+            int src_index = (src_y * src_width + src_x) * 4;
+            int dest_index = (y * dest_width + x) * 4;
+
+            dest[dest_index + 0] = src[src_index + 0];
+            dest[dest_index + 1] = src[src_index + 1];
+            dest[dest_index + 2] = src[src_index + 2];
+            dest[dest_index + 3] = src[src_index + 3];
+        }
+    }
+}

third_party/noita_random/wang/search.cpp

@@ -0,0 +1,328 @@
+#pragma once
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "pix.cpp"
+
+const unsigned long NO_PARENT = (unsigned long)-1;
+
+void fill(unsigned char *map,
+          int w,
+          int x1,
+          int x2,
+          int y1,
+          int y2,
+          long color)
+{
+  for (int x = x1; x <= x2; x++)
+  {
+    for (int y = y1; y <= y2; y++)
+    {
+      setPixelColor(map, w, x, y, color);
+    }
+  }
+}
+
+struct FloodPoint
+{
+  unsigned int x;
+  unsigned int y;
+};
+
+struct FloodStack
+{
+  FloodPoint *items;
+  unsigned long len;
+  unsigned long cap;
+};
+
+static void flood_stack_push(FloodStack *stack, unsigned int x, unsigned int y)
+{
+  if (stack->len == stack->cap)
+  {
+    stack->cap = stack->cap == 0 ? 256 : stack->cap * 2;
+    stack->items = (FloodPoint *)realloc(stack->items, stack->cap * sizeof(FloodPoint));
+  }
+  stack->items[stack->len++] = FloodPoint{x, y};
+}
+
+static FloodPoint flood_stack_pop(FloodStack *stack)
+{
+  return stack->items[--stack->len];
+}
+
+void floodFill(unsigned char *map,
+               uint width,
+               uint height,
+               uint initialX,
+               uint initialY,
+               unsigned long fromColor,
+               unsigned long toColor)
+{
+  if (initialX >= width || initialY >= height)
+  {
+    return;
+  }
+
+  unsigned char *visited = (unsigned char *)calloc(width * height, 1);
+  FloodStack stack = {};
+
+  flood_stack_push(&stack, initialX, initialY);
+  visited[getPos(width, 1, initialX, initialY)] = true;
+
+  while (stack.len > 0)
+  {
+    FloodPoint pos = flood_stack_pop(&stack);
+    const int x = pos.x;
+    const int y = pos.y;
+
+    setPixelColor(map, width, x, y, toColor);
+
+    const int next[4][2] = {
+        {x - 1, y},
+        {x + 1, y},
+        {x, y - 1},
+        {x, y + 1},
+    };
+
+    for (int i = 0; i < 4; i++)
+    {
+      int nx = next[i][0];
+      int ny = next[i][1];
+      if (nx < 0 || ny < 0 || (uint)nx >= width || (uint)ny >= height)
+      {
+        continue;
+      }
+
+      unsigned long p = getPos(width, 1, nx, ny);
+      if (visited[p])
+      {
+        continue;
+      }
+
+      unsigned long nc = getPixelColor(map, p * 3);
+      if (nc != fromColor || nc == toColor)
+      {
+        continue;
+      }
+
+      visited[p] = true;
+      flood_stack_push(&stack, nx, ny);
+    }
+  }
+
+  free(stack.items);
+  free(visited);
+}
+
+struct SearchNode
+{
+  int x;
+  int y;
+  unsigned long parent;
+  unsigned long order;
+};
+
+struct NodeHeap
+{
+  SearchNode *items;
+  unsigned long len;
+  unsigned long cap;
+  int targetY;
+};
+
+static int node_priority(const NodeHeap *heap, const SearchNode *node)
+{
+  int dy = node->y - heap->targetY;
+  return dy < 0 ? -dy : dy;
+}
+
+static bool node_less(const NodeHeap *heap, const SearchNode *a, const SearchNode *b)
+{
+  int ap = node_priority(heap, a);
+  int bp = node_priority(heap, b);
+  if (ap != bp)
+  {
+    return ap < bp;
+  }
+  return a->order < b->order;
+}
+
+static void heap_swap(SearchNode *a, SearchNode *b)
+{
+  SearchNode tmp = *a;
+  *a = *b;
+  *b = tmp;
+}
+
+static void heap_push(NodeHeap *heap, SearchNode node)
+{
+  if (heap->len == heap->cap)
+  {
+    heap->cap = heap->cap == 0 ? 256 : heap->cap * 2;
+    heap->items = (SearchNode *)realloc(heap->items, heap->cap * sizeof(SearchNode));
+  }
+
+  unsigned long i = heap->len++;
+  heap->items[i] = node;
+  while (i > 0)
+  {
+    unsigned long parent = (i - 1) / 2;
+    if (!node_less(heap, &heap->items[i], &heap->items[parent]))
+    {
+      break;
+    }
+    heap_swap(&heap->items[i], &heap->items[parent]);
+    i = parent;
+  }
+}
+
+static SearchNode heap_pop(NodeHeap *heap)
+{
+  SearchNode result = heap->items[0];
+  heap->items[0] = heap->items[--heap->len];
+
+  unsigned long i = 0;
+  while (true)
+  {
+    unsigned long left = i * 2 + 1;
+    unsigned long right = left + 1;
+    unsigned long best = i;
+
+    if (left < heap->len && node_less(heap, &heap->items[left], &heap->items[best]))
+    {
+      best = left;
+    }
+    if (right < heap->len && node_less(heap, &heap->items[right], &heap->items[best]))
+    {
+      best = right;
+    }
+    if (best == i)
+    {
+      break;
+    }
+    heap_swap(&heap->items[i], &heap->items[best]);
+    i = best;
+  }
+
+  return result;
+}
+
+class Search
+{
+public:
+  unsigned char *map;
+  int width;
+  int height;
+  int targetX;
+  int targetY;
+  char *visited;
+  unsigned long *parents;
+  unsigned long endPos = NO_PARENT;
+
+  NodeHeap heap = {};
+  unsigned long order = 0;
+
+  Search(unsigned char _map[], int _width, int _height, int _targetX, int _targetY, unsigned long *_parents)
+  {
+    map = _map;
+    width = _width;
+    height = _height;
+    targetX = _targetX;
+    targetY = _targetY;
+    parents = _parents;
+    visited = (char *)calloc(width * height, 1);
+    heap.targetY = targetY;
+  }
+
+  ~Search()
+  {
+    free(heap.items);
+    free(visited);
+  }
+
+  bool findPath(int x, int y)
+  {
+    unsigned long start = pos(x, y);
+    setVisited(x, y);
+    parents[start] = NO_PARENT;
+    heap_push(&heap, SearchNode{x, y, NO_PARENT, order++});
+
+    while (heap.len > 0)
+    {
+      SearchNode n = heap_pop(&heap);
+      if (atTarget(&n))
+      {
+        endPos = pos(n.x, n.y);
+        return true;
+      }
+
+      tryNext(n.x, n.y - 1, &n);
+      tryNext(n.x - 1, n.y, &n);
+      tryNext(n.x + 1, n.y, &n);
+      tryNext(n.x, n.y + 1, &n);
+    }
+    return false;
+  }
+
+  unsigned long pos(int x, int y) const
+  {
+    return getPos(width, 1, x, y);
+  }
+
+private:
+  bool tryNext(int x, int y, SearchNode *n)
+  {
+    if (!valid(x, y))
+    {
+      return false;
+    }
+    if (isVisited(x, y))
+    {
+      return false;
+    }
+    if (!traversable(x, y))
+    {
+      return false;
+    }
+
+    unsigned long p = pos(x, y);
+    unsigned long parent = pos(n->x, n->y);
+    setVisited(x, y);
+    parents[p] = parent;
+    heap_push(&heap, SearchNode{x, y, parent, order++});
+    return true;
+  }
+
+  void setVisited(int x, int y)
+  {
+    unsigned long p = pos(x, y);
+
+    setPixelColor(map, p * 3, COLOR_PURPLE);
+    visited[p] = true;
+  }
+
+  bool isVisited(int x, int y)
+  {
+    return visited[pos(x, y)];
+  }
+
+  bool valid(int x, int y) const
+  {
+    return x >= 0 && y >= 0 && x < width && y < height;
+  }
+
+  bool traversable(int x, int y) const
+  {
+    unsigned long p = pos(x, y);
+    long c = getPixelColor(map, p * 3);
+
+    return c == COLOR_BLACK || c == COLOR_COFFEE || c == COLOR_FROZEN_VAULT_MINT || c == COLOR_HELL_GREEN;
+  }
+
+  bool atTarget(SearchNode *n) const
+  {
+    return targetY == n->y;
+  }
+};

third_party/noita_random/wang/wang.cpp

@@ -0,0 +1,940 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../noita_random.cpp"
+#include "stb_hbwang.h"
+#include "coalmine_hax.cpp"
+#include "jps.hh"
+#include "pix.cpp"
+#include "search.cpp"
+#include "png.cpp"
+#include "MurmurHash3.cpp"
+
+// TODO: Look into optimizing with <https://github.com/google/highway>
+
+const bool DEBUG = false;
+
+// MODIFIED (noita_gpu): see MapGen::hasPath. Default is the engine's value.
+static int g_path_check_max_height = 205;
+
+NollaPrng GetRNG(int width)
+{
+   NollaPrng rng;
+   rng.SetRandomFromWorldSeed(world_seed);
+   rng.Next();
+
+   int iters = width + world_seed + 11 * (width / -11) - 12 * (world_seed / 12);
+
+   if (iters > 0)
+   {
+      do
+      {
+         rng.Next();
+         iters -= 1;
+      } while (iters != 0);
+   }
+   return rng;
+}
+
+class ToFrom
+{
+public:
+   unsigned int from;
+   unsigned int *to;
+   int to_count;
+   NollaPrng rng;
+};
+
+// This needs to be sorted for binary search
+static const unsigned long blockedColors[] = {
+    0x00ac6e, // load_pixel_scene4_alt
+    0x70d79e, // load_gunpowderpool_01
+    0x70d79f, //???
+    0x70d7a1, // load_gunpowderpool_04
+    0x7868ff, // load_gunpowderpool_02
+    0xc35700, // load_oiltank
+    0xff0080, // load_pixel_scene2
+    0xff00ff, //???
+    0xff0aff, // load_pixel_scene
+};
+
+bool isBlockedColor(unsigned long color)
+{
+   for (uint i = 0; i < sizeof(blockedColors) / sizeof(blockedColors[0]); i++)
+   {
+      if (blockedColors[i] == color)
+      {
+         return true;
+      }
+   }
+   return false;
+}
+
+const int BIOME_PATH_FIND_WORLD_POS_MIN_X = 159;
+const int BIOME_PATH_FIND_WORLD_POS_MAX_X = 223;
+
+const int WORLD_OFFSET_X = 35;
+const int WORLD_OFFSET_Y = 14;
+
+int GetWidthFromPix(const int a, const int b, const int offset)
+{
+   return (((b - offset) * 512) / 10 - ((a - offset) * 512) / 10);
+}
+int GetWidthFromPix(const int a, const int b)
+{
+   return GetWidthFromPix(a, b, 0);
+}
+
+static int floorDiv512(int value)
+{
+   if (value >= 0)
+   {
+      return value / 512;
+   }
+   return -(((-value) + 511) / 512);
+}
+
+int GetTilePosXValue(const int gx, const int gy)
+{
+   return floorDiv512(gx) + WORLD_OFFSET_X;
+}
+
+int GetTilePosYValue(const int gx, const int gy)
+{
+   return floorDiv512(gy) + WORLD_OFFSET_Y;
+}
+
+int GetGlobalPosXValue(const int x, const int y)
+{
+   return 512 * (x - WORLD_OFFSET_X);
+}
+
+int GetGlobalPosYValue(const int x, const int y)
+{
+   return 512 * (y - WORLD_OFFSET_Y);
+}
+
+double GetBiomeOffsetX()
+{
+   NollaPrng rng = NewNollaPrng(world_seed);
+   double someRand = rng.Next() * 9999.0 + 1.0;
+   double someRand2 = rng.Next() * 200000.0 - 100000.0;
+   double offset = rng.Next() * 200000.0 - 100000.0;
+   return offset;
+}
+
+void rgbaToRgb(const unsigned char *src, unsigned char *dest, uint w, uint h)
+{
+   unsigned long j = 0;
+   unsigned long src_size = w * h;
+   for (unsigned long i = 0; i < src_size; i++)
+   {
+      dest[j++] = src[i * 4];
+      dest[j++] = src[i * 4 + 1];
+      dest[j++] = src[i * 4 + 2];
+   }
+}
+
+void rgbToRgba(const unsigned char *src, unsigned char *dest, uint w, uint h)
+{
+   unsigned long j = 0;
+   unsigned long src_size = w * h;
+   for (unsigned long i = 0; i < src_size; i++)
+   {
+      dest[j++] = src[i * 3];
+      dest[j++] = src[i * 3 + 1];
+      dest[j++] = src[i * 3 + 2];
+      dest[j++] = 255;
+   }
+}
+
+void whiteout(unsigned char *src, uint w, uint h)
+{
+   unsigned long src_size = w * h;
+   for (unsigned long i = 0; i < src_size; i++)
+   {
+      src[i * 4] = 255;
+      src[i * 4 + 1] = 255;
+      src[i * 4 + 2] = 255;
+      src[i * 4 + 3] = 255;
+   }
+}
+
+enum mapToUse
+{
+   out,
+   path
+};
+
+struct Block
+{
+   int startX;
+   int startY;
+   int endX;
+   int endY;
+};
+
+struct BlockList
+{
+   Block *items;
+   uint len;
+   uint cap;
+};
+
+void blockListClear(BlockList *list)
+{
+   list->len = 0;
+}
+
+void blockListFree(BlockList *list)
+{
+   free(list->items);
+   list->items = NULL;
+   list->len = 0;
+   list->cap = 0;
+}
+
+void blockListPush(BlockList *list, Block block)
+{
+   if (list->len == list->cap)
+   {
+      list->cap = list->cap == 0 ? 32 : list->cap * 2;
+      list->items = (Block *)realloc(list->items, list->cap * sizeof(Block));
+   }
+   list->items[list->len++] = block;
+}
+
+class MapGen
+{
+public:
+   unsigned char *out_map;
+   unsigned char *path_map;
+   uint width;
+   uint height;
+   bool isCoalMine;
+   bool shouldBlockOutRooms;
+   unsigned int *randomMaterials;
+   int worldX;
+   int worldY;
+
+   mapToUse usemap = out;
+
+   unsigned long endNode;
+   unsigned long *parents;
+
+   BlockList blockedOutRooms = {};
+
+   MapGen(
+       unsigned char *_map,
+       uint _width,
+       uint _height,
+       bool _isCoalMine,
+       bool _shouldBlockOutRooms,
+       unsigned int *_randomMaterials,
+       int _worldX,
+       int _worldY) : width(_width),
+                      height(_height),
+                      out_map(_map),
+                      isCoalMine(_isCoalMine),
+                      shouldBlockOutRooms(_shouldBlockOutRooms),
+                      randomMaterials(_randomMaterials),
+                      worldX(_worldX),
+                      worldY(_worldY)
+   {
+      path_map = (unsigned char *)malloc(3 * width * height);
+      memcpy(path_map, out_map, 3 * width * height);
+      parents = (unsigned long *)malloc(width * height * sizeof(unsigned long));
+   }
+
+   ~MapGen()
+   {
+      blockListFree(&blockedOutRooms);
+      free(parents);
+      free(path_map);
+   }
+
+   unsigned char *GetMap()
+   {
+      if (DEBUG)
+      {
+         return out_map;
+      }
+      switch (usemap)
+      {
+      case out:
+         return out_map;
+         break;
+      case path:
+         return path_map;
+         break;
+
+      default:
+         return out_map;
+         break;
+      }
+   }
+
+   void reset()
+   {
+      blockListClear(&blockedOutRooms);
+   }
+
+   void resetParents()
+   {
+      unsigned long count = width * height;
+      for (unsigned long i = 0; i < count; i++)
+      {
+         parents[i] = NO_PARENT;
+      }
+   }
+
+   bool hasPath()
+   {
+      usemap = out;
+      if (shouldBlockOutRooms)
+      {
+         blockOutRooms(COLOR_BLACK, COLOR_WHITE);
+      }
+
+      if (isCoalMine)
+      {
+         doCoalMineHax();
+      }
+
+      memcpy(path_map, out_map, 3 * width * height);
+
+      usemap = path;
+      bool valid = isValid();
+      // MODIFIED (noita_gpu): the engine only requires the path check to pass for maps whose height
+      // is <= 205 wang pixels (noita.exe FUN_00879bf0: `local_90 = height <= DAT_01152478`, value 205);
+      // taller maps accept the first generated image.
+      if ((int)height > g_path_check_max_height)
+      {
+         return true;
+      }
+      return valid;
+   }
+
+   void finalize()
+   {
+      usemap = out;
+      // Generated, now to fix up the map
+      bool mainPath = isMainPath();
+      if (!isCoalMine && mainPath)
+      {
+         fillMainPath();
+      }
+      if (isCoalMine)
+      {
+         undoCoalMineHax();
+      }
+      if (shouldBlockOutRooms)
+      {
+         fillBlockedRooms(COLOR_BLACK);
+      }
+      ClearPath();
+      fillC0ffee();
+      fillRandomMaterials();
+   }
+
+   void undoCoalMineHax()
+   {
+      unsigned char *map = GetMap();
+      for (int y = 0; y < height; y++)
+      {
+         for (int x = 0; x < width; x++)
+         {
+            long overlayPos = getPos(256, 3, x, y);
+            long i = getPos(width, 3, x, y);
+            long pix = createRGB(coalmine_overlay[overlayPos], coalmine_overlay[overlayPos + 1], coalmine_overlay[overlayPos + 2]);
+            if (pix == 0x4000)
+            {
+               // pudy248 note: is not actually air, this is the main rock portion of the overlay
+               map[i] = 0x00;
+               map[i + 1] = 0x00;
+               map[i + 2] = 0x00;
+            }
+            if (pix == 0x0040)
+            { // blue. Looks like air?
+               map[i] = 0x00;
+               map[i + 1] = 0x00;
+               map[i + 2] = 0x00;
+            }
+            if (pix == 0xFEFEFE)
+            { // white. Stairs. rock_static_intro
+               // In the debug it's not shown, but used in path finding.
+               map[i] = 0x00;
+               map[i + 1] = 0x00;
+               map[i + 2] = 0x00;
+            }
+         }
+      }
+   }
+
+   void doCoalMineHax()
+   {
+      unsigned char *map = GetMap();
+      for (int y = 0; y < height; y++)
+      {
+         for (int x = 0; x < width; x++)
+         {
+            long overlayPos = getPos(256, 3, x, y);
+            long i = getPos(width, 3, x, y);
+            long pix = createRGB(coalmine_overlay[overlayPos], coalmine_overlay[overlayPos + 1], coalmine_overlay[overlayPos + 2]);
+            if (pix == 0x4000)
+            {
+               // pudy248 note: is not actually air, this is the main rock portion of the overlay
+               map[i] = 0xFF;
+               map[i + 1] = 0xFF;
+               map[i + 2] = 0xFF;
+            }
+            if (pix == 0x0040)
+            { // blue. Looks like air?
+               map[i] = 0x00;
+               map[i + 1] = 0x00;
+               map[i + 2] = 0x00;
+            }
+            if (pix == 0xFEFEFE)
+            { // white. Stairs. rock_static_intro
+               // In the debug it's not shown, but used in path finding.
+               map[i] = 0x0a;
+               map[i + 1] = 0x33;
+               map[i + 2] = 0x44;
+            }
+         }
+      }
+   }
+
+   void ClearPath()
+   {
+      unsigned char *map = GetMap();
+      unsigned long current = endNode;
+      unsigned long max = width * height;
+      while (current != NO_PARENT && current < max)
+      {
+         int x = current % width;
+         int y = current / width;
+         long c = getPixelColor(map, width, x, y);
+         if (c == COLOR_COFFEE)
+         {
+            floodFill(map, width, height, x, y, COLOR_COFFEE, COLOR_BLACK);
+         }
+         current = parents[current];
+      }
+   }
+
+   bool HasPathToBottom(
+       uint path_start_x,
+       bool fixed_x)
+   {
+      unsigned char *map = GetMap();
+      resetParents();
+      Search s = Search(map, width, height, 0, height - 1, parents);
+
+      if (fixed_x)
+      {
+         bool hasPath = s.findPath(path_start_x, 0);
+         if (hasPath)
+         {
+            endNode = s.endPos;
+            return true;
+         }
+         return false;
+      }
+
+      int x = path_start_x;
+
+      while (x < width)
+      {
+         long c = getPixelColor(map, width, x, 0);
+         if (c != COLOR_BLACK && c != COLOR_COFFEE)
+         {
+            x++;
+            continue;
+         }
+
+         if (c == COLOR_COFFEE)
+         {
+            floodFill(map, width, height, x, 0, COLOR_COFFEE, COLOR_BLACK);
+            continue;
+         }
+
+         bool hasPath = s.findPath(x, 0);
+         if (hasPath)
+         {
+            endNode = s.endPos;
+            return true;
+         }
+         x++;
+      }
+      return false;
+   }
+
+   bool isMainPath()
+   {
+      int fill_x_from = (BIOME_PATH_FIND_WORLD_POS_MIN_X - worldX * 512.0) / 10;
+      int fill_x_to = fill_x_from + (BIOME_PATH_FIND_WORLD_POS_MAX_X - BIOME_PATH_FIND_WORLD_POS_MIN_X) / 10;
+      return worldY < 29 && fill_x_to > 0 && fill_x_from > 0 && width > fill_x_from && fill_x_to < width + fill_x_from;
+   }
+
+   int fillMainPath()
+   {
+      unsigned char *map = GetMap();
+      int fill_x_from = (BIOME_PATH_FIND_WORLD_POS_MIN_X - worldX * 512.0) / 10;
+      int fill_x_to = fill_x_from + (BIOME_PATH_FIND_WORLD_POS_MAX_X - BIOME_PATH_FIND_WORLD_POS_MIN_X) / 10;
+      fill(map, width, fill_x_from, fill_x_to, 0, 6, COLOR_BLACK);
+      return fill_x_from;
+   }
+
+   void clearStartingArea()
+   {
+      unsigned char *map = GetMap();
+      uint x = 0;
+
+      for (uint x = 0; x < width; x++)
+      {
+         long c = getPixelColor(map, width, x, 0);
+         if (c == COLOR_COFFEE)
+         {
+            floodFill(map, width, height, x, 0, COLOR_COFFEE, COLOR_BLACK);
+         }
+      }
+   }
+
+   bool isValid()
+   {
+      uint path_start_x = 0;
+      bool mainPath = isMainPath();
+      if (isCoalMine)
+      {
+         path_start_x = 0x8e;
+      }
+      else if (mainPath)
+      {
+         path_start_x = fillMainPath();
+      }
+
+      bool hasPath = HasPathToBottom(path_start_x, mainPath);
+
+      return hasPath;
+   }
+
+   void blockOutRooms(unsigned long passableColor, unsigned long targetColor)
+   {
+      unsigned char *map = GetMap();
+      unsigned long posMax = width * height;
+
+      for (unsigned long pos = 0; pos < posMax; pos++)
+      {
+         long color = getPixelColor(map, pos * 3);
+         // ~70% of pixels are black or white, so skip them
+         if (color == COLOR_BLACK)
+         {
+            continue;
+         }
+         if (color == COLOR_WHITE)
+         {
+            continue;
+         }
+         if (!isBlockedColor(color))
+         {
+            continue;
+         }
+         uint x = pos % width;
+         uint y = pos / width;
+
+         int startX = x + 1;
+         int endX = x + 1;
+         int startY = y + 1;
+         int endY = y + 1;
+         bool foundEnd = false;
+         while (!foundEnd && endX < width)
+         {
+            long c = getPixelColor(map, width, endX, startY);
+            if (c == passableColor || ShadeOfGrey(c, 0x32))
+            {
+               endX += 1;
+               continue;
+            };
+            endX -= 1;
+            foundEnd = true;
+         }
+         if (endX >= width)
+         {
+            endX = width - 1;
+         }
+         foundEnd = false;
+         while (!foundEnd && endY < height)
+         {
+            long c = getPixelColor(map, width, startX, endY);
+            if (c == passableColor || ShadeOfGrey(c, 0x32))
+            {
+               endY += 1;
+               continue;
+            };
+            endY -= 1;
+            foundEnd = true;
+         }
+         if (endY >= height)
+         {
+            endY = height - 1;
+         }
+         blockListPush(&blockedOutRooms, Block{startX, startY, endX, endY});
+         fill(map, width, startX, endX, startY, endY, targetColor);
+      }
+   }
+
+   void fillBlockedRooms(unsigned long color)
+   {
+      unsigned char *map = GetMap();
+      for (uint i = 0; i < blockedOutRooms.len; i++)
+      {
+         Block block = blockedOutRooms.items[i];
+         fill(map, width, block.startX, block.endX, block.startY, block.endY, color);
+      }
+   }
+
+   void fillC0ffee()
+   {
+      unsigned char *map = GetMap();
+      NollaPrng rng = NewNollaPrng(0);
+      rng.SetRandomFromWorldSeed(world_seed);
+      rng.Next();
+
+      unsigned long posMax = width * height;
+
+      for (unsigned long pos = 0; pos < posMax; pos++)
+      {
+         long c = getPixelColor(map, pos * 3);
+         if (c != COLOR_COFFEE)
+         {
+            continue;
+         }
+
+         long to = COLOR_BLACK;
+         if (0.5f > (float)rng.Next()) // BIOME_RANDOM_BLOCK_CHANCE
+         {
+            to = COLOR_WHITE;
+         }
+
+         int x = pos % width;
+         int y = pos / width;
+         floodFill(map, width, height, x, y, COLOR_COFFEE, to);
+      }
+   }
+
+   void fillRandomMaterials()
+   {
+      unsigned char *map = GetMap();
+      int numberOfRandoms = randomMaterials[0];
+      if (numberOfRandoms == 0)
+      {
+         return;
+      }
+      ToFrom *replacements = (ToFrom *)malloc(numberOfRandoms * sizeof(ToFrom));
+      int pos = 1;
+
+      for (int i = 0; i < numberOfRandoms; i++)
+      {
+         replacements[i].from = randomMaterials[pos];
+         replacements[i].to_count = randomMaterials[pos + 1];
+         replacements[i].to = &randomMaterials[pos + 2];
+         replacements[i].rng = GetRNG(width);
+         replacements[i].rng.Next();
+         pos += 2 + replacements[i].to_count;
+      }
+
+      for (int i = 0; i < numberOfRandoms; i++)
+      {
+         ToFrom *rr = &replacements[i];
+         unsigned long posMax = width * height;
+         for (unsigned long pos = 0; pos < posMax; pos++)
+         {
+            long c = getPixelColor(map, pos * 3);
+            if (c != rr->from)
+            {
+               continue;
+            }
+            int rand = rr->rng.Random(0, rr->to_count - 1);
+            int x = pos % width;
+            int y = pos / width;
+            floodFill(map, width, height, x, y, rr->from, rr->to[rand]);
+         }
+      }
+      free(replacements);
+   }
+};
+
+struct TilesetCacheEntry
+{
+   unsigned long color;
+   stbhw_tileset *tileset;
+};
+
+static TilesetCacheEntry *tilesetCache = NULL;
+static uint tilesetCacheLen = 0;
+static uint tilesetCacheCap = 0;
+
+static uint nextWangRandom(void *user)
+{
+   return ((NollaPrng *)user)->NextU();
+}
+
+stbhw_tileset *get_tileset(unsigned long color, const unsigned char *rgba_tiles_data, uint tiles_width, uint tiles_height)
+{
+   for (uint i = 0; i < tilesetCacheLen; i++)
+   {
+      if (tilesetCache[i].color == color)
+      {
+         return tilesetCache[i].tileset;
+      }
+   }
+
+   stbhw_tileset *ts = (stbhw_tileset *)malloc(sizeof(stbhw_tileset));
+   memset(ts, 0, sizeof(stbhw_tileset));
+   unsigned char *rgb_tiles_data = (unsigned char *)malloc(3 * tiles_width * tiles_height);
+   rgbaToRgb(rgba_tiles_data, rgb_tiles_data, tiles_width, tiles_height);
+   int success = stbhw_build_tileset_from_image(ts, rgb_tiles_data, tiles_width * 3, tiles_width, tiles_height);
+   free(rgb_tiles_data);
+   if (!success)
+   {
+      free(ts);
+      return NULL;
+   }
+
+   if (tilesetCacheLen == tilesetCacheCap)
+   {
+      tilesetCacheCap = tilesetCacheCap == 0 ? 16 : tilesetCacheCap * 2;
+      tilesetCache = (TilesetCacheEntry *)realloc(tilesetCache, tilesetCacheCap * sizeof(TilesetCacheEntry));
+   }
+   tilesetCache[tilesetCacheLen++] = TilesetCacheEntry{color, ts};
+   return ts;
+}
+
+void generate_map_from_rgba_tiles(
+    unsigned char *rgba_tiles_data,
+    uint tiles_width,
+    uint tiles_height,
+    unsigned char *result,
+    uint width,
+    uint height,
+    unsigned long color,
+    bool isCoalMine,
+    bool shouldBlockOutRooms,
+    unsigned int *randomMaterials,
+    int worldX,
+    int worldY)
+{
+   if (rgba_tiles_data == NULL || tiles_width == 0 || tiles_height == 0)
+   {
+      whiteout(result, width, height);
+      return;
+   }
+
+   stbhw_tileset *ts = get_tileset(color, rgba_tiles_data, tiles_width, tiles_height);
+   if (ts == NULL)
+   {
+      return;
+   }
+
+   NollaPrng rng = GetRNG(width);
+
+   int tries = 0;
+   long mod_malloc_amount = 3 * width * (height + 4);
+   unsigned char *res = (unsigned char *)malloc(mod_malloc_amount);
+   long malloc_amount = 3 * width * height;
+
+   unsigned char *rgb_result = (unsigned char *)malloc(malloc_amount);
+
+   bool hasPath = false;
+   do
+   {
+      if (tries >= 100)
+      {
+         break;
+      }
+
+      NollaPrng rng2 = NewNollaPrng(rng.NextU());
+
+      int success = stbhw_generate_image(ts, NULL, res, width * 3, width, height + 4, nextWangRandom, &rng2);
+      if (!success)
+      {
+         free(res);
+         free(rgb_result);
+         return;
+      }
+
+      int num_bytes = 4 * 3 * width;
+      memcpy(rgb_result, &res[num_bytes], mod_malloc_amount - num_bytes);
+
+      MapGen mg = MapGen(rgb_result, width, height, isCoalMine, shouldBlockOutRooms, randomMaterials, worldX, worldY);
+
+      hasPath = mg.hasPath();
+      if (hasPath)
+      {
+         mg.finalize();
+      }
+      mg.reset();
+      tries++;
+   } while (hasPath == false);
+
+   free(res);
+   rgbToRgba(rgb_result, result, width, height);
+   free(rgb_result);
+}
+
+class MapHandler
+{
+public:
+   uint width;
+   uint height;
+   unsigned long color;
+   bool isCoalMine;
+   bool shouldBlockOutRooms;
+   unsigned int *randomMaterials;
+   int worldX;
+   int worldY;
+
+   unsigned char *map;
+   unsigned char *bigMap;
+
+   void init(
+       uint _width,
+       uint _height,
+       unsigned long _color,
+       bool _isCoalMine,
+       bool _shouldBlockOutRooms,
+       uintptr_t _randomMaterials,
+       int _worldX,
+       int _worldY)
+   {
+      width = _width;
+      height = _height;
+      color = _color;
+      isCoalMine = _isCoalMine;
+      shouldBlockOutRooms = _shouldBlockOutRooms;
+      randomMaterials = reinterpret_cast<unsigned int *>(_randomMaterials);
+      worldX = _worldX - WORLD_OFFSET_X;
+      worldY = _worldY - WORLD_OFFSET_Y;
+      map = (unsigned char *)malloc(_width * _height * 4);
+      bigMap = (unsigned char *)malloc(_width * 10 * _height * 10 * 4);
+   }
+
+   void destroy()
+   {
+      free(map);
+      free(bigMap);
+   }
+
+   void generate_map(const unsigned char *png_data, uint32_t png_len)
+   {
+      if (png_data == NULL || png_len == 0)
+      {
+         whiteout(map, width, height);
+         return;
+      }
+      image tiles = load_png_bytes(png_data, png_len);
+      generate_map_from_rgba_tiles(
+          tiles.image,
+          tiles.width,
+          tiles.height,
+          map,
+          width,
+          height,
+          color,
+          isCoalMine,
+          shouldBlockOutRooms,
+          randomMaterials,
+          worldX,
+          worldY);
+      free_png_image(&tiles);
+   }
+
+   void toBig()
+   {
+      scaleImage(map, width, height, bigMap, 10);
+   }
+
+   void drawImageData(image *img, int gx, int gy, uintptr_t _colorToMaterialTable)
+   {
+      if (img == NULL || img->image == NULL)
+      {
+         return;
+      }
+
+      // int tx = (gx) / 512;
+      int tx = (gx + 5) / 512;
+      // int rx = (gx) % 512;
+      int rx = (gx + 5) % 512;
+
+      // int ty = (gy) / 512;
+      int ty = (gy + 13) / 512;
+      // int ry = (gy) % 512;
+      int ry = (gy + 13) % 512;
+
+      int old_px = (tx - worldX) * 512 + rx;
+      int old_py = (ty - worldY) * 512 + ry;
+
+      int px = gx - worldX * 512;
+      int py = gy - worldY * 512;
+
+      // printf("drawImageData path: %s, gx: %i, gy: %i, px: %i, py: %i, old_px: %i, old_py: %i\n", path.c_str(), gx, gy, px, py, old_px, old_py);
+
+      const unsigned int *colorToMaterialTable = reinterpret_cast<unsigned int *>(_colorToMaterialTable);
+
+      // Check that the image won't go out of bounds
+      // if (px + img.width > width * 10 || py + img.height > height * 10)
+      // {
+      //    printf("drawImageData out of bounds %i %i %i %i\n", px, py, img.width, img.height);
+      //    return;
+      // }
+      // if (px < 0 || py < 0)
+      // {
+      //    printf("drawImageData out of bounds %i %i %i %i\n", px, py, img.width, img.height);
+      //    return;
+      // }
+
+      for (int y = 0; y < img->height; y++)
+      {
+         for (int x = 0; x < img->width; x++)
+         {
+            unsigned long offset = getPos(img->width, img->channels, x, y);
+            unsigned long pixel = getRGBAPixelColor(img->image, offset);
+            bool isTransparent = isRGBATransparent(pixel);
+            if (pixel == 0xFF || isTransparent) // 0x000000FF (black)
+            {
+               continue;
+            }
+
+            unsigned long toColor = pixel;
+            for (int i = 0; i < colorToMaterialTable[0]; i++)
+            {
+               int offset = 1 + i * 2;
+               if (colorToMaterialTable[offset] == pixel)
+               {
+                  toColor = colorToMaterialTable[offset + 1];
+                  break;
+               }
+            }
+            setRGBAPixelColor(bigMap, width * 10, px + x, py + y, toColor);
+         }
+      }
+   }
+};
+
+// map and result are allocated and freed in js.
+// Only used in coalmines?
+STBHW_EXTERN void generate_path_map(
+    unsigned char map[],
+    uint map_w,
+    uint map_h,
+    unsigned char result[],
+    int worldX,
+    int worldY)
+{
+   long malloc_amount = 3 * map_w * map_h;
+   memcpy(result, map, malloc_amount);
+   uint path_start_x = 0x8e;
+   floodFill(result, map_w, map_h, path_start_x, 1, COLOR_BLACK, COLOR_PURPLE);
+}