controls: Add vendor control/property support to generation scripts

Add support for vendor-specific controls and properties to libcamera.
The controls/properties are defined by a "vendor" tag in the YAML
control description file, for example:

vendor: rpi
controls:
  - MyExampleControl:
      type: string
      description: |
        Test for libcamera vendor-specific controls.

This will now generate a control id in the libcamera::controls::rpi
namespace, ensuring no id conflict between different vendors, core or
draft libcamera controls. Similarly, a ControlIdMap control is generated
in the libcamera::controls::rpi namespace.

A #define LIBCAMERA_HAS_RPI_VENDOR_CONTROLS is also generated to allow
applications to conditionally compile code if the specific vendor
controls are present. For the python bindings, the control is available
with libcamera.controls.rpi.MyExampleControl. The above controls
example applies similarly to properties.

Existing libcamera controls defined in control_ids.yaml are given the
"libcamera" vendor tag.

A new --mode flag is added to gen-controls.py to specify the mode of
operation, either 'controls' or 'properties' to allow the code generator
to correctly set the #define string.

As a drive-by, sort and redefine the output command line argument in
gen-controls.py and gen-py-controls.py to ('--output', '-o') for
consistency.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

3 files changed, 55 insertions, 32 deletions

diff --git a/src/py/libcamera/gen-py-controls.py b/src/py/libcamera/gen-py-controls.py
index 9948c41e..dfd7c179 100755
--- a/src/py/libcamera/gen-py-controls.py
+++ b/src/py/libcamera/gen-py-controls.py
@@ -24,45 +24,59 @@ def find_common_prefix(strings):
 def generate_py(controls, mode):
     out = ''
 
-    for ctrl in controls:
-        name, ctrl = ctrl.popitem()
-
-        if ctrl.get('draft'):
-            ns = 'libcamera::{}::draft::'.format(mode)
-            container = 'draft'
-        else:
-            ns = 'libcamera::{}::'.format(mode)
-            container = 'controls'
+    vendors_class_def = []
+    vendor_defs = []
+    vendors = []
+    for vendor, ctrl_list in controls.items():
+        for ctrls in ctrl_list:
+            name, ctrl = ctrls.popitem()
+
+            if vendor not in vendors and vendor != 'libcamera':
+                vendors_class_def.append('class Py{}Controls\n{{\n}};\n'.format(vendor))
+                vendor_defs.append('\tauto {} = py::class_<Py{}Controls>(controls, \"{}\");'.format(vendor, vendor, vendor))
+                vendors.append(vendor)
+
+            if ctrl.get('draft'):
+                ns = 'libcamera::{}::draft::'.format(mode)
+                container = 'draft'
+            elif vendor != 'libcamera':
+                ns = 'libcamera::{}::{}::'.format(mode, vendor)
+                container = vendor
+            else:
+                ns = 'libcamera::{}::'.format(mode)
+                container = 'controls'
 
-        out += f'\t{container}.def_readonly_static("{name}", static_cast<const libcamera::ControlId *>(&{ns}{name}));\n\n'
+            out += f'\t{container}.def_readonly_static("{name}", static_cast<const libcamera::ControlId *>(&{ns}{name}));\n\n'
 
-        enum = ctrl.get('enum')
-        if not enum:
-            continue
+            enum = ctrl.get('enum')
+            if not enum:
+                continue
 
-        cpp_enum = name + 'Enum'
+            cpp_enum = name + 'Enum'
 
-        out += '\tpy::enum_<{}{}>({}, \"{}\")\n'.format(ns, cpp_enum, container, cpp_enum)
+            out += '\tpy::enum_<{}{}>({}, \"{}\")\n'.format(ns, cpp_enum, container, cpp_enum)
 
-        if mode == 'controls':
-            # Adjustments for controls
-            if name == 'LensShadingMapMode':
-                prefix = 'LensShadingMapMode'
+            if mode == 'controls':
+                # Adjustments for controls
+                if name == 'LensShadingMapMode':
+                    prefix = 'LensShadingMapMode'
+                else:
+                    prefix = find_common_prefix([e['name'] for e in enum])
             else:
+                # Adjustments for properties
                 prefix = find_common_prefix([e['name'] for e in enum])
-        else:
-            # Adjustments for properties
-            prefix = find_common_prefix([e['name'] for e in enum])
 
-        for entry in enum:
-            cpp_enum = entry['name']
-            py_enum = entry['name'][len(prefix):]
+            for entry in enum:
+                cpp_enum = entry['name']
+                py_enum = entry['name'][len(prefix):]
 
-            out += '\t\t.value(\"{}\", {}{})\n'.format(py_enum, ns, cpp_enum)
+                out += '\t\t.value(\"{}\", {}{})\n'.format(py_enum, ns, cpp_enum)
 
-        out += '\t;\n\n'
+            out += '\t;\n\n'
 
-    return {'controls': out}
+    return {'controls': out,
+            'vendors_class_def': '\n'.join(vendors_class_def),
+            'vendors_defs': '\n'.join(vendor_defs)}
 
 
 def fill_template(template, data):
@@ -75,14 +89,14 @@ def fill_template(template, data):
 def main(argv):
     # Parse command line arguments
     parser = argparse.ArgumentParser()
-    parser.add_argument('-o', dest='output', metavar='file', type=str,
+    parser.add_argument('--mode', '-m', type=str, required=True,
+                        help='Mode is either "controls" or "properties"')
+    parser.add_argument('--output', '-o', metavar='file', type=str,
                         help='Output file name. Defaults to standard output if not specified.')
     parser.add_argument('input', type=str,
                         help='Input file name.')
     parser.add_argument('template', type=str,
                         help='Template file name.')
-    parser.add_argument('--mode', type=str, required=True,
-                        help='Mode is either "controls" or "properties"')
     args = parser.parse_args(argv[1:])
 
     if args.mode not in ['controls', 'properties']:
@@ -90,7 +104,10 @@ def main(argv):
         return -1
 
     data = open(args.input, 'rb').read()
-    controls = yaml.safe_load(data)['controls']
+
+    controls = {}
+    vendor = yaml.safe_load(data)['vendor']
+    controls[vendor] = yaml.safe_load(data)['controls']
 
     data = generate_py(controls, args.mode)
 
diff --git a/src/py/libcamera/py_controls_generated.cpp.in b/src/py/libcamera/py_controls_generated.cpp.in
index 18fa57d9..ec4b55ef 100644
--- a/src/py/libcamera/py_controls_generated.cpp.in
+++ b/src/py/libcamera/py_controls_generated.cpp.in
@@ -21,10 +21,13 @@ class PyDraftControls
 {
 };
 
+${vendors_class_def}
+
 void init_py_controls_generated(py::module& m)
 {
 	auto controls = py::class_<PyControls>(m, "controls");
 	auto draft = py::class_<PyDraftControls>(controls, "draft");
+${vendors_defs}
 
 ${controls}
 }
diff --git a/src/py/libcamera/py_properties_generated.cpp.in b/src/py/libcamera/py_properties_generated.cpp.in
index e49b6e91..f7b5ec8c 100644
--- a/src/py/libcamera/py_properties_generated.cpp.in
+++ b/src/py/libcamera/py_properties_generated.cpp.in
@@ -21,10 +21,13 @@ class PyDraftProperties
 {
 };
 
+${vendors_class_def}
+
 void init_py_properties_generated(py::module& m)
 {
 	auto controls = py::class_<PyProperties>(m, "properties");
 	auto draft = py::class_<PyDraftProperties>(controls, "draft");
+${vendors_defs}
 
 ${controls}
 }