diff --git a/gsk/vulkan/resources/generate-header.py b/gsk/vulkan/resources/generate-header.py
index 57aa954232..49e7c1e0c0 100644
--- a/gsk/vulkan/resources/generate-header.py
+++ b/gsk/vulkan/resources/generate-header.py
@@ -8,138 +8,123 @@ name = os.path.splitext(os.path.basename(sys.argv[1]))[0]
 var_name = "gsk_vulkan_" + name.replace('-', '_')
 struct_name = "GskVulkan" + name.title().replace('-', '') + "Instance"
 
-lines = open (sys.argv[1]).readlines()
-matches = []
+with open(sys.argv[1]) as f:
+    lines = f.readlines()
+    matches = []
 
-for line in lines:
-    match = re.search("^layout\(location = ([0-9]+)\) in ([a-z0-9]+) ([a-zA-Z0-9]+);$", line)
-    if not match:
-        if re.search("layout.*\sin\s.*", line):
-            raise Exception("Failed to parse file")
-        continue;
-    if not match.group(3).startswith('in'):
-        raise Exception("Variable doesn't start with 'in'")
-    matches.append({ 'name': ''.join('_' + char.lower() if char.isupper() else char for char in match.group(3))[3:],
-                     'location': int(match.group(1)),
-                     'type': match.group(2) })
+    for line in lines:
+        match = re.search(r"^layout\(location = ([0-9]+)\) in ([a-z0-9]+) ([a-zA-Z0-9]+);$", line)
+        if not match:
+            if re.search(r"layout.*\sin\s.*", line):
+                raise Exception("Failed to parse file")
+            continue
+        if not match.group(3).startswith('in'):
+            raise Exception("Variable doesn't start with 'in'")
+        matches.append({'name': ''.join('_' + char.lower() if char.isupper() else char for char in match.group(3))[3:],
+                        'location': int(match.group(1)),
+                        'type': match.group(2)})
 
-print(
-f'''#pragma once
+print(f'''/* This file is auto-generated; any change will not be preserved */
+#pragma once
 
 typedef struct _{struct_name} {struct_name};
 
 struct _{struct_name} {{''')
 
-expected = 0;
+expected = 0
 for match in matches:
     if expected != int(match['location']):
-        raise Exception(f"Should be layout location {expected} but is {match['location']}")
+        raise Exception(f"Should be layout location {expected} but is {match['location']}")  # noqa
 
-    match match['type']:
-        case "float":
-            print(f"  float {match['name']};")
-            expected += 1
-        case "int":
-            print(f"  gint32 {match['name']};")
-            expected += 1
-        case "uint":
-            print(f"  guint32 {match['name']};")
-            expected += 1
-        case "uvec2":
-            print(f"  guint32 {match['name']}[2];")
-            expected += 1
-        case "vec2":
-            print(f"  float {match['name']}[2];")
-            expected += 1
-        case "vec4":
-            print(f"  float {match['name']}[4];")
-            expected += 1
-        case "mat3x4":
-            print(f"  float {match['name']}[12];")
-            expected += 3
-        case "mat4":
-            print(f"  float {match['name']}[16];")
-            expected += 4
-        case _:
-            raise Exception(f"Don't know what a {match['type']} is")
+    if match['type'] == 'float':
+        print(f"  float {match['name']};")
+        expected += 1
+    elif match['type'] == 'int':
+        print(f"  gint32 {match['name']};")
+        expected += 1
+    elif match['type'] == 'uint':
+        print(f"  guint32 {match['name']};")
+        expected += 1
+    elif match['type'] == 'uvec2':
+        print(f"  guint32 {match['name']}[2];")
+        expected += 1
+    elif match['type'] == 'vec2':
+        print(f"  float {match['name']}[2];")
+        expected += 1
+    elif match['type'] == 'vec4':
+        print(f"  float {match['name']}[4];")
+        expected += 1
+    elif match['type'] == 'mat3x4':
+        print(f"  float {match['name']}[12];")
+        expected += 3
+    elif match['type'] == 'mat4':
+        print(f"  float {match['name']}[16];")
+        expected += 4
+    else:
+        raise Exception(f"Don't know what a {match['type']} is")
 
-print(
-'''};
+print('''};
 ''')
 
-print(
-f'''static const VkPipelineVertexInputStateCreateInfo {var_name}_info = {{
+print(f'''static const VkPipelineVertexInputStateCreateInfo {var_name}_info = {{
   .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
   .vertexBindingDescriptionCount = 1,
   .pVertexBindingDescriptions = (VkVertexInputBindingDescription[1]) {{
       {{
-          .binding = 0,
-          .stride = sizeof ({struct_name}),
-          .inputRate = VK_VERTEX_INPUT_RATE_INSTANCE
+        .binding = 0,
+        .stride = sizeof ({struct_name}),
+        .inputRate = VK_VERTEX_INPUT_RATE_INSTANCE
       }}
   }},
   .vertexAttributeDescriptionCount = {expected},
   .pVertexAttributeDescriptions = (VkVertexInputAttributeDescription[{expected}]) {{''')
 
 for match in matches:
-    match match['type']:
-        case "float":
-            print(
-f'''      {{
+    if match['type'] == 'float':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32_SFLOAT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}),
       }},''')
-
-        case "int":
-            print(
-f'''      {{
+    elif match['type'] == 'int':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32_SINT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}),
       }},''')
 
-        case "uint":
-            print(
-f'''      {{
+    elif match['type'] == 'uint':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32_UINT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}),
       }},''')
-
-        case "uvec2":
-            print(
-f'''      {{
+    elif match['type'] == 'uvec2':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32G32_UINT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}),
       }},''')
-
-        case "vec2":
-            print(
-f'''      {{
+    elif match['type'] == 'vec2':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32G32_SFLOAT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}),
       }},''')
-
-        case "vec4":
-            print(
-f'''      {{
+    elif match['type'] == 'vec4':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32G32B32A32_SFLOAT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}),
       }},''')
-
-        case "mat3x4":
-            print(
-f'''      {{
+    elif match['type'] == 'mat3x4':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32G32B32A32_SFLOAT,
@@ -157,10 +142,8 @@ f'''      {{
         .format = VK_FORMAT_R32G32B32A32_SFLOAT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}) + sizeof (float) * 8,
       }},''')
-
-        case "mat4":
-            print(
-f'''      {{
+    elif match['type'] == 'mat4':
+        print(f'''      {{
         .location = {match['location']},
         .binding = 0,
         .format = VK_FORMAT_R32G32B32A32_SFLOAT,
@@ -184,9 +167,8 @@ f'''      {{
         .format = VK_FORMAT_R32G32B32A32_SFLOAT,
         .offset = G_STRUCT_OFFSET({struct_name}, {match['name']}) + sizeof (float) * 12,
       }},''')
-
-        case _:
-            raise Exception(f"Don't know what a {match['type']} is")
+    else:
+        raise Exception(f"Don't know what a {match['type']} is")
 
 print("  },")
 print("};")