feat: add histogram calculation

Author: seankmartin

examples/shader_computations/histogram.py

@@ -0,0 +1,27 @@
+def transform_input(x):
+    if x == 0:
+        return 1.0 / 256.0 - 1.0
+    if x < 0:
+        x = 0.0
+    elif x > 1.0:
+        x = 1.0
+    else:
+        x = (1.0 + x * 253.0) / 255.0
+    return 2.0 * (x * 255.0 + 0.5) / 256.0 - 1.0
+
+
+def main():
+    input_values = [
+        0.0,
+        0.5,
+        1.0,
+        1.5,
+        -1.5,
+    ]
+
+    for x in input_values:
+        print(f"transform_input({x}) = {transform_input(x)}")
+
+
+if __name__ == "__main__":
+    main()