Add script to extract build/tileset.png from Load_Tile routine in tiles.gbasm

1 files changed, 47 insertions, 0 deletions

diff --git a/scripts/extract-vram-tileset.py b/scripts/extract-vram-tileset.py
new file mode 100644
index 0000000..93b5f8b
--- /dev/null
+++ b/scripts/extract-vram-tileset.py
@@ -0,0 +1,47 @@
+from PIL import Image
+import numpy as np
+import sys
+
+colours = [(0xe0, 0xf8, 0xd0), (0x88, 0xc0, 0x70), (0x34, 0x68, 0x56), (0x08, 0x18, 0x20)]
+
+if len(sys.argv) != 3:
+    print("Usage: ./extract-vram-tileset.py [vram_dump_file] [output_png]")
+    sys.exit(-1)
+
+filename = sys.argv[1]
+
+output_filename = sys.argv[2]
+
+file = open(filename, "r")
+
+vram_text = file.read()
+
+vram = [int(x, 16) for x in vram_text.split()]
+
+def parse_tile(image, tile, offset):
+    for y in range(0, 16, 2):
+        for x in range(0, 8):
+            colour_id = 0b00
+            colour_id |= (tile[y] >> (7-x)) & 1
+            colour_id |= ((tile[y+1] >> (7-x)) & 1) << 1
+            image.putpixel((x+offset[0],int(y/2)+offset[1]), colours[colour_id])
+    return image
+
+image = Image.new("RGB", (128,128))
+
+x = 0
+y = 0
+for tile_addr in range(0x1000, 0x1800, 0x10):
+    parse_tile(image, vram[tile_addr:tile_addr + 0x10], (x * 8, y * 8))
+    x += 1
+    if x == 0x10:
+        x = 0
+        y += 1
+for tile_addr in range(0x800, 0x1000, 0x10):
+    parse_tile(image, vram[tile_addr:tile_addr + 0x10], (x * 8, y * 8))
+    x += 1
+    if x == 0x10:
+        x = 0
+        y += 1
+
+image.save(output_filename)