From dabd2a803a2cfe016ca912fb503ceb334529221a Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Wed, 27 Jan 2021 16:03:04 +0000
Subject: [PATCH] Give specific instructions on writing UI extensions

* This goes through a worked example of a simple extension.
---
 docs/how/how_python_extension.rst             |   8 +-
 docs/imgs/python_ext/Step1.png                | Bin 0 -> 29329 bytes
 docs/imgs/python_ext/Step2.png                | Bin 0 -> 14043 bytes
 docs/python_api/index.rst                     |   1 +
 .../ui_extension_tutorial/__init__.py         | 151 +++++++++++
 .../ui_extension_tutorial/extension.json      |   9 +
 docs/python_api/ui_extensions.rst             | 242 ++++++++++++++++++
 7 files changed, 407 insertions(+), 4 deletions(-)
 create mode 100644 docs/imgs/python_ext/Step1.png
 create mode 100644 docs/imgs/python_ext/Step2.png
 create mode 100644 docs/python_api/ui_extension_tutorial/__init__.py
 create mode 100644 docs/python_api/ui_extension_tutorial/extension.json
 create mode 100644 docs/python_api/ui_extensions.rst

diff --git a/docs/how/how_python_extension.rst b/docs/how/how_python_extension.rst
index e23da0534..d245e9948 100644
--- a/docs/how/how_python_extension.rst
+++ b/docs/how/how_python_extension.rst
@@ -1,9 +1,9 @@
-How do I write a python extension?
-==================================
+How do I register a python extension?
+=====================================
 
 RenderDoc supports python extensions using the :doc:`existing python API <../python_api/index>`. These extensions can be configured to be persistent and load whenever the RenderDoc UI does, allowing users to extend the program with custom functionality.
 
-Example extensions can be found at the `community contributed repository <https://github.com/baldurk/renderdoc-contrib>`_.
+Example extensions can be found at the `community contributed repository <https://github.com/baldurk/renderdoc-contrib>`_. More information on writing an extension is available at :doc:`../python_api/ui_extensions`.
 
 Creating extensions
 -------------------
@@ -62,4 +62,4 @@ A python extension when loaded will have a ``register`` function called in its m
 
 Optionally you can define an ``unregister`` function to be called if the extension is reloaded. This takes no parameters and is simply an opportunity to clean-up or remove anything persistent that shouldn't hang around, before ``register`` is called again.
 
-Extensions use the full :doc:`python API <../python_api/index>` with all of the power that comes with it. There are interfaces geared specifically towards extensions in :doc:`the qrenderdoc module <../python_api/qrenderdoc/extensions>` which allow registering callbacks for menu items.
\ No newline at end of file
+Extensions use the full :doc:`python API <../python_api/index>` with all of the power that comes with it. There are interfaces geared specifically towards extensions in :doc:`the qrenderdoc module <../python_api/qrenderdoc/extensions>` which allow registering callbacks for menu items.
diff --git a/docs/imgs/python_ext/Step1.png b/docs/imgs/python_ext/Step1.png
new file mode 100644
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diff --git a/docs/python_api/index.rst b/docs/python_api/index.rst
index 58ba4f7a6..754340eb4 100644
--- a/docs/python_api/index.rst
+++ b/docs/python_api/index.rst
@@ -28,6 +28,7 @@ Each example has a simple motivating goal and shows how to achieve it using the
     examples/renderdoc_intro
     examples/qrenderdoc_intro
     dev_environment
+    ui_extensions
     examples/basics
     examples/renderdoc/index
     examples/qrenderdoc/index
diff --git a/docs/python_api/ui_extension_tutorial/__init__.py b/docs/python_api/ui_extension_tutorial/__init__.py
new file mode 100644
index 000000000..3de1e98df
--- /dev/null
+++ b/docs/python_api/ui_extension_tutorial/__init__.py
@@ -0,0 +1,151 @@
+###############################################################################
+# The MIT License (MIT)
+#
+# Copyright (c) 2021 Baldur Karlsson
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+###############################################################################
+
+import qrenderdoc as qrd
+import renderdoc as rd
+from typing import Optional
+
+
+class Window(qrd.CaptureViewer):
+    def __init__(self, ctx: qrd.CaptureContext, version: str):
+        super().__init__()
+
+        self.mqt: qrd.MiniQtHelper = ctx.Extensions().GetMiniQtHelper()
+
+        self.ctx = ctx
+        self.version = version
+        self.topWindow = self.mqt.CreateToplevelWidget("Breadcrumbs", lambda c, w, d: window_closed())
+
+        vert = self.mqt.CreateVerticalContainer()
+        self.mqt.AddWidget(self.topWindow, vert)
+
+        self.breadcrumbs = self.mqt.CreateLabel()
+
+        self.mqt.AddWidget(vert, self.breadcrumbs)
+
+        ctx.AddCaptureViewer(self)
+
+    def OnCaptureLoaded(self):
+        self.mqt.SetWidgetText(self.breadcrumbs, "Breadcrumbs:")
+
+    def OnCaptureClosed(self):
+        self.mqt.SetWidgetText(self.breadcrumbs, "Breadcrumbs:")
+
+    def OnSelectedEventChanged(self, event):
+        pass
+
+    def OnEventChanged(self, event):
+        draw = self.ctx.GetDrawcall(event)
+
+        breadcrumbs = ''
+
+        if draw is not None:
+            breadcrumbs = '@{}: {}'.format(draw.eventId, draw.name)
+
+            while draw.parent is not None:
+                draw = draw.parent
+                breadcrumbs = '@{}: {}'.format(draw.eventId, draw.name) + '\n' + breadcrumbs
+
+        self.mqt.SetWidgetText(self.breadcrumbs, "Breadcrumbs:\n{}".format(breadcrumbs))
+
+
+cur_window: Optional[Window] = None
+
+
+def window_closed():
+    global cur_window
+
+    if cur_window is not None:
+        cur_window.ctx.RemoveCaptureViewer(cur_window)
+
+    cur_window = None
+
+
+def window_callback(ctx: qrd.CaptureContext, data):
+    global cur_window
+
+    if cur_window is None:
+        cur_window = Window(ctx, extiface_version)
+        if ctx.HasEventBrowser():
+            ctx.AddDockWindow(cur_window.topWindow, qrd.DockReference.TopOf, ctx.GetEventBrowser().Widget(), 0.1)
+        else:
+            ctx.AddDockWindow(cur_window.topWindow, qrd.DockReference.MainToolArea, None)
+
+    ctx.RaiseDockWindow(cur_window.topWindow)
+
+
+def menu_callback(ctx: qrd.CaptureContext, data):
+    texid = rd.ResourceId.Null()
+    depth = ctx.CurPipelineState().GetDepthTarget()
+
+    # Prefer depth if possible
+    if depth.resourceId != rd.ResourceId.Null():
+        texid = depth.resourceId
+    else:
+        cols = ctx.CurPipelineState().GetOutputTargets()
+
+        # See if we can get the first colour target instead
+        if len(cols) > 1 and cols[0].resourceId != rd.ResourceId.Null():
+            texid = cols[0].resourceId
+
+    if texid == rd.ResourceId.Null():
+        ctx.Extensions().MessageDialog("Couldn't find any bound target!", "Extension message")
+        return
+    else:
+        mqt = ctx.Extensions().GetMiniQtHelper()
+        texname = ctx.GetResourceName(texid)
+
+        def get_minmax(r: rd.ReplayController):
+            minvals, maxvals = r.GetMinMax(texid, rd.Subresource(), rd.CompType.Typeless)
+
+            msg = '{} has min {:.4} and max {:.4} in red'.format(texname, minvals.floatValue[0], maxvals.floatValue[0])
+
+            mqt.InvokeOntoUIThread(lambda: ctx.Extensions().MessageDialog(msg, "Extension message"))
+
+        ctx.Replay().AsyncInvoke('', get_minmax)
+
+
+
+extiface_version = ''
+
+
+def register(version: str, ctx: qrd.CaptureContext):
+    global extiface_version
+    extiface_version = version
+
+    print("Registering my extension for RenderDoc version {}".format(version))
+
+    ctx.Extensions().RegisterWindowMenu(qrd.WindowMenu.Tools, ["My extension"], menu_callback)
+    ctx.Extensions().RegisterWindowMenu(qrd.WindowMenu.Window, ["Extension Window"], window_callback)
+
+
+def unregister():
+    print("Unregistering my extension")
+
+    global cur_window
+
+    if cur_window is not None:
+        # The window_closed() callback will unregister the capture viewer
+        cur_window.ctx.Extensions().GetMiniQtHelper().CloseToplevelWidget(cur_window.topWindow)
+        cur_window = None
diff --git a/docs/python_api/ui_extension_tutorial/extension.json b/docs/python_api/ui_extension_tutorial/extension.json
new file mode 100644
index 000000000..19e56ec0f
--- /dev/null
+++ b/docs/python_api/ui_extension_tutorial/extension.json
@@ -0,0 +1,9 @@
+{
+	"extension_api": 1,
+	"name": "Tutorial extension",
+	"version": "1.0",
+	"minimum_renderdoc": "1.12",
+	"description": "Tutorial extension from the documentation.",
+	"author": "Baldur Karlsson <baldurk@baldurk.org>",
+	"url": "https://github.com/baldurk/renderdoc"
+}
diff --git a/docs/python_api/ui_extensions.rst b/docs/python_api/ui_extensions.rst
new file mode 100644
index 000000000..32d0ed3c7
--- /dev/null
+++ b/docs/python_api/ui_extensions.rst
@@ -0,0 +1,242 @@
+Writing UI extensions
+=====================
+
+This document outlines how to get started writing a UI extension. For information on how to configure, register and install a UI extension see :doc:`../how/how_python_extension`.
+
+First steps
+-----------
+
+We start off with the basic registration function. Create an ``__init__.py`` in your extension's root and fill it out:
+
+.. highlight:: python
+.. code:: python
+
+    import qrenderdoc as qrd
+
+    extiface_version = ''
+
+    def register(version: str, ctx: qrd.CaptureContext):
+        global extiface_version
+        extiface_version = version
+
+        print("Registering my extension for RenderDoc version {}".format(version))
+
+    def unregister():
+        print("Unregistering my extension")
+
+Here we create the minimum ``register()`` and ``unregister()`` functions required for an extension to load, that just print a message. We store the interface version in a global which we can use in future to do version-checks if we want to be compatible with more than one RenderDoc version, since the python interface is not fully forwards and backwards compatible.
+
+This doesn't really do much, let's register a tool menu item:
+
+.. highlight:: python
+.. code:: python
+
+    def menu_callback(ctx: qrd.CaptureContext, data):
+        ctx.Extensions().MessageDialog("Hello from the extension!", "Extension message")
+
+    def register(version: str, ctx: qrd.CaptureContext):
+        # as above ...
+
+        ctx.Extensions().RegisterWindowMenu(qrd.WindowMenu.Tools, ["My extension"], menu_callback)
+
+Now we have a new menu item which when clicked produces a popup message dialog!
+
+.. figure:: ../imgs/python_ext/Step1.png
+
+    Python extension generating a message box
+
+This is a good proof of concept, but really we want something more directly usable. Instead of showing a message box, let's show a window which reacts to the selected drawcall by showing a series of breadcrumbs for marker labels.
+
+Adding a window and capture viewer
+----------------------------------
+
+First we create a class to handle our window and to derive from :py:class:`qrenderdoc.CaptureViewer` to get callbacks for events.
+
+.. highlight:: python
+.. code:: python
+
+    class Window(qrd.CaptureViewer):
+        def __init__(self, ctx: qrd.CaptureContext, version: str):
+            super().__init__()
+
+            self.mqt: qrd.MiniQtHelper = ctx.Extensions().GetMiniQtHelper()
+
+            self.ctx = ctx
+            self.version = version
+            self.topWindow = self.mqt.CreateToplevelWidget("Breadcrumbs", lambda c, w, d: window_closed())
+
+            ctx.AddCaptureViewer(self)
+
+        def OnCaptureLoaded(self):
+            pass
+
+        def OnCaptureClosed(self):
+            pass
+
+        def OnSelectedEventChanged(self, event):
+            pass
+
+        def OnEventChanged(self, event):
+            pass
+
+Here we implement stubs for the different events. More information on when they are sent can be found in the class documentation. We use the :py:class:`qrenderdoc.MiniQtHelper` to create a top-level window for ourselves with the 'breadcrumbs' title, then register oureslves as a capture viewer. The mini-Qt helper is useful to provide simple access to Qt widgets in a portable way from the RenderDoc UI, without relying on full Qt python bindings that may not be available depending on how RenderDoc was built.
+
+We will need to unregister ourselves as a capture viewer when the window is closed, which happens in the ``window_closed()`` callback that we'll define later.
+
+An empty window is not very useful, so let's give ourselves a label. More complex layouts and widgets are of course possible but for the moment we'll keep it simple:
+
+.. highlight:: python
+.. code:: python
+
+    vert = self.mqt.CreateVerticalContainer()
+    self.mqt.AddWidget(self.topWindow, vert)
+
+    self.breadcrumbs = self.mqt.CreateLabel()
+
+    self.mqt.AddWidget(vert, self.breadcrumbs)
+
+And finally we can fill in the event functions to set the breadcrumbs. We use ``@1234`` syntax for events which causes them to be clickable links that jump to that event. You can also convert a :py:class:`renderdoc.ResourceId` to a string with ``str()`` and it will similarly provide a link for that resource named with the current debug name.
+
+.. highlight:: python
+.. code:: python
+
+    def OnCaptureLoaded(self):
+        self.mqt.SetWidgetText(self.breadcrumbs, "Breadcrumbs:")
+
+    def OnCaptureClosed(self):
+        self.mqt.SetWidgetText(self.breadcrumbs, "Breadcrumbs:")
+
+    def OnSelectedEventChanged(self, event):
+        pass
+
+    def OnEventChanged(self, event):
+        draw = self.ctx.GetDrawcall(event)
+
+        breadcrumbs = ''
+
+        if draw is not None:
+            breadcrumbs = '@{}: {}'.format(draw.eventId, draw.name)
+
+            while draw.parent is not None:
+                draw = draw.parent
+                breadcrumbs = '@{}: {}'.format(draw.eventId, draw.name) + '\n' + breadcrumbs
+
+        self.mqt.SetWidgetText(self.breadcrumbs, "Breadcrumbs:\n{}".format(breadcrumbs))
+
+Finally we'll register a new menu item to display the window. We only allow one window at once, so if it still exists we'll just raise it. Otherwise we create a new one. This is also where we unregister the capture viewer:
+
+.. highlight:: python
+.. code:: python
+
+    from typing import Optional
+
+
+    cur_window: Optional[Window] = None
+
+
+    def window_closed():
+        global cur_window
+        if cur_window is not None:
+            cur_window.ctx.RemoveCaptureViewer(cur_window)
+        cur_window = None
+
+
+    def open_window_callback(ctx: qrd.CaptureContext, data):
+        global cur_window
+
+        mqt = ctx.Extensions().GetMiniQtHelper()
+
+        if cur_window is None:
+            cur_window = Window(ctx, extiface_version)
+            if ctx.HasEventBrowser():
+                ctx.AddDockWindow(cur_window.topWindow, qrd.DockReference.TopOf, ctx.GetEventBrowser().Widget(), 0.1)
+            else:
+                ctx.AddDockWindow(cur_window.topWindow, qrd.DockReference.MainToolArea, None)
+
+        ctx.RaiseDockWindow(cur_window.topWindow)
+
+
+    def register(version: str, ctx: qrd.CaptureContext):
+        # as above ...
+
+        ctx.Extensions().RegisterWindowMenu(qrd.WindowMenu.Window, ["Extension Window"], window_callback)
+
+
+    def unregister():
+        print("Unregistering my extension")
+
+        global cur_window
+
+        if cur_window is not None:
+            # The window_closed() callback will unregister the capture viewer
+            cur_window.ctx.Extensions().GetMiniQtHelper().CloseToplevelWidget(cur_window.topWindow)
+            cur_window = None
+
+With that we now have a new little breadcrumbs window that docks itself above our event browser to show where we are in the frame:
+
+.. figure:: ../imgs/python_ext/Step2.png
+
+    Python extension showing the current draw's breadcrumbs
+
+Calling onto replay thread
+--------------------------
+
+So far this has worked well, but we're only using information available on the UI thread. A good amount of useful information is cached on the UI thread including the current pipeline state and drawcalls, but for some work we might want to call into the underlying analysis functions. When we do this we must do it on the replay thread to avoid blocking the UI if the analysis work takes a long time.
+
+This can get quite complex so we will do something very simple, in the message box callback that we created earlier instead of displaying the message box immediately we will first figure out the minimum and maximum values for the current depth output or first colour output and display that.
+
+To start with we can identify the resource on the UI thread, so let's do that:
+
+.. highlight:: python
+.. code:: python
+
+    import renderdoc as rd
+
+    def menu_callback(ctx: qrd.CaptureContext, data):
+        texid = rd.ResourceId.Null()
+        depth = ctx.CurPipelineState().GetDepthTarget()
+
+        # Prefer depth if possible
+        if depth.resourceId != rd.ResourceId.Null():
+            texid = depth.resourceId
+        else:
+            cols = ctx.CurPipelineState().GetOutputTargets()
+
+            # See if we can get the first colour target instead
+            if len(cols) > 1 and cols[0].resourceId != rd.ResourceId.Null():
+                texid = cols[0].resourceId
+
+        if texid == rd.ResourceId.Null():
+            ctx.Extensions().MessageDialog("Couldn't find any bound target!", "Extension message")
+            return
+
+
+This all happens as before on the UI thread using UI-cached pipeline state data. If we can't find a resource we just bail out, but otherwise we have ``texid`` with the texture we want to analyse.
+
+To do this we invoke onto a different thread twice - first the UI thread invokes onto the replay thread to calculate the minimum and maximum values. Then that callback invokes back onto the UI thread to display a message.
+
+.. highlight:: python
+.. code:: python
+
+    if texid == rd.ResourceId.Null():
+        ctx.Extensions().MessageDialog("Couldn't find any bound target!", "Extension message")
+        return
+    else:
+        mqt = ctx.Extensions().GetMiniQtHelper()
+        texname = ctx.GetResourceName(texid)
+
+        def get_minmax(r: rd.ReplayController):
+            minvals, maxvals = r.GetMinMax(texid, rd.Subresource(), rd.CompType.Typeless)
+
+            msg = '{} has min {:.4} and max {:.4} in red'.format(texname, minvals.floatValue[0], maxvals.floatValue[0])
+
+            mqt.InvokeOntoUIThread(lambda: ctx.Extensions().MessageDialog(msg, "Extension message"))
+
+        ctx.Replay().AsyncInvoke('', get_minmax)
+
+Now that we've done that correctly our extension will be able to run in-depth replay analysis without calling functions from the wrong thread or stalling the UI.
+
+Conclusion
+----------
+
+Hopefully now from that worked example you have an idea of the basics of writing UI extensions. More complex examples can be found at the `community contributed repository <https://github.com/baldurk/renderdoc-contrib>`_ and the source code for this extension is available in the `github repository <https://github.com/baldurk/renderdoc/tree/v1.x/docs/python_api/ui_extension_tutorial>`_