loki5512344
91835402b3
- Core world model (World, Dimension, Tile, Terrain, Platform) - NBT reader/writer with full tag support - Anvil region (.mca) format reader with chunk parsing - Block palette compression and export - Biome database with Minecraft 1.21 biomes - CLI commands: new, import, export, info, render - GUI application with egui (viewport, tools, undo/redo) - Noise-based heightmap generation and editing operations License: GPL-3.0-or-later
90 lines
2.7 KiB
Python
Executable file
90 lines
2.7 KiB
Python
Executable file
"""Download and extract Minecraft colour map PNGs as raw RGB arrays.
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The grass.png and foliage.png are 256x256 colour lookup tables.
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x-axis = temperature (0-255), y-axis = downfall (0-255).
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"""
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import urllib.request
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import struct
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import os
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import json
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import zlib
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def download_file(url):
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req = urllib.request.Request(url, headers={"User-Agent": "Mozilla/5.0"})
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resp = urllib.request.urlopen(req, timeout=15)
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return resp.read()
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def parse_png_rgb(data):
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"""Parse a PNG file and extract RGB pixel data as a flat array."""
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# PNG signature check
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assert data[:8] == b'\x89PNG\r\n\x1a\n', "Not a valid PNG"
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# Find IHDR and IDAT chunks
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pos = 8
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chunks = []
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idat_data = b''
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while pos < len(data):
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length = struct.unpack('>I', data[pos:pos+4])[0]
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chunk_type = data[pos+4:pos+8]
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chunk_data = data[pos+8:pos+8+length]
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if chunk_type == b'IHDR':
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width = struct.unpack('>I', chunk_data[0:4])[0]
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height = struct.unpack('>I', chunk_data[4:8])[0]
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bit_depth = chunk_data[8]
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color_type = chunk_data[9]
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elif chunk_type == b'IDAT':
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idat_data += chunk_data
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elif chunk_type == b'IEND':
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break
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pos += 12 + length
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# Decompress
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raw_data = zlib.decompress(idat_data)
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# Extract RGB pixels (filter byte per row)
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pixels = []
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row_size = 1 + width * 3 # filter byte + RGB per pixel
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for y in range(height):
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row_start = y * row_size + 1 # skip filter byte
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for x in range(width):
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offset = row_start + x * 3
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r = raw_data[offset]
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g = raw_data[offset + 1]
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b = raw_data[offset + 2]
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pixels.append([r, g, b])
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return width, height, pixels
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def main():
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base_url = "https://raw.githubusercontent.com/InventivetalentDev/minecraft-assets/1.21.11/assets/minecraft/textures/colormap"
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output_dir = os.path.join(os.path.dirname(__file__), "..", "crates", "biome-db", "data")
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for name in ["grass", "foliage"]:
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url = f"{base_url}/{name}.png"
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print(f"Downloading {name}.png...")
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png_data = download_file(url)
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width, height, pixels = parse_png_rgb(png_data)
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print(f" Size: {width}x{height}, pixels: {len(pixels)}")
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# Save as JSON array: [[r,g,b], ...] flattened
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flat = [v for pixel in pixels for v in pixel]
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output = {
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"width": width,
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"height": height,
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"data": flat,
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}
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out_path = os.path.join(output_dir, f"{name}_colormap.json")
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with open(out_path, "w") as f:
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json.dump(output, f)
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print(f" Written to {out_path}")
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if __name__ == "__main__":
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main()
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