From 83ce8c6148b60f39ba77e5c03cecc72ea5bc4a8c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Le=20Bihan?= <clement.lebihan773@gmail.com>
Date: Sun, 11 Jul 2021 17:29:52 +0200
Subject: [PATCH] adding python script

---
 Utils/pythonvram.py | 76 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100755 Utils/pythonvram.py

diff --git a/Utils/pythonvram.py b/Utils/pythonvram.py
new file mode 100755
index 0000000..45674ea
--- /dev/null
+++ b/Utils/pythonvram.py
@@ -0,0 +1,76 @@
+
+# python script to convert tile indexes to correct values in vram depending on the bpp
+
+def getVRAMValue2bpp(nums):
+    vramValues = []
+    
+    
+    valHex1 = 0
+    valHex2 = 0
+    for i in nums:
+        valHex1 = 0
+        valHex2 = 0
+        shift = 7
+        for j in i:
+            valHex1 += (j & 1) << shift
+            valHex2 += ((j & 2) >> 1) << shift
+            shift -= 1
+        
+        vramValues.append((valHex1 << 8) + valHex2)
+    
+    padding = 4
+    for i in vramValues:
+        print('{0:0{1}X}'.format(i, 4), end=' ')
+    print("")
+
+def getVRAMValue4bpp(nums):
+    getVRAMValue2bpp(extract2BppBitPlans(nums, 0))
+    getVRAMValue2bpp(extract2BppBitPlans(nums, 1))
+
+def getVRAMValue8bpp(nums):
+    getVRAMValue2bpp(extract2BppBitPlans(nums, 0))
+    getVRAMValue2bpp(extract2BppBitPlans(nums, 1))
+    getVRAMValue2bpp(extract2BppBitPlans(nums, 2))
+    getVRAMValue2bpp(extract2BppBitPlans(nums, 3))
+
+def extract2BppBitPlans(nums, index):
+    high = []
+    for i in nums:
+        high.append([(j & (0x3 << (2 * index))) >> (index * 2) for j in i])
+    return high
+    
+result2 = [
+        [0, 1, 1, 1, 1, 1, 0, 0],
+        [1, 2, 3, 3, 3, 2, 1, 0],
+        [1, 2, 3, 3, 3, 2, 1, 0],
+        [0, 1, 1, 1, 1, 1, 0, 0],
+        [0, 0, 0, 1, 0, 0, 0, 0],
+        [1, 1, 0, 1, 0, 1, 1, 0],
+        [0, 1, 1, 1, 1, 1, 0, 0],
+        [0, 0, 1, 1, 1, 0, 0, 0]
+    ]
+    
+result2 = [
+        [0, 7, 7, 7, 7, 7, 0, 0],
+        [7, 2, 6, 8, 6, 2, 7, 0],
+        [7, 2, 2, 2, 2, 2, 7, 0],
+        [0, 7, 7, 7, 7, 7, 0, 0],
+        [0, 0, 0, 4, 0, 0, 0, 0],
+        [3, 5, 0, 5, 0, 5, 3, 0],
+        [0, 3, 4, 5, 4, 3, 0, 0],
+        [0, 0, 3, 3, 3, 0, 0, 0],
+    ]
+
+result2 = [
+		[0x00, 0x22, 0x22, 0x22, 0x23, 0x23, 0x00, 0x00],
+		[0x22, 0x11, 0x42, 0x21, 0x41, 0x11, 0x24, 0x00],
+		[0x23, 0x11, 0x12, 0x12, 0x12, 0x12, 0x24, 0x00],
+		[0x00, 0x24, 0x25, 0x25, 0x25, 0x25, 0x00, 0x00],
+		[0x00, 0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0x00],
+		[0x35, 0x32, 0x00, 0x31, 0x00, 0x31, 0x35, 0x00],
+		[0x00, 0x34, 0x33, 0x31, 0x33, 0x34, 0x00, 0x00],
+		[0x00, 0x00, 0x35, 0x36, 0x36, 0x00, 0x00, 0x00]
+    ]
+
+getVRAMValue8bpp(result2)
+