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Carla
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Update DPF

tags/1.9.4
falkTX 10 years ago
parent
610377afb8
commit
a8227e885e
10 changed files with 194 additions and 144 deletions
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  1. +9
    -1
      source/modules/dgl/NanoVG.hpp
  2. +10
    -1
      source/modules/dgl/Widget.hpp
  3. +9
    -0
      source/modules/dgl/src/NanoVG.cpp
  4. +6
    -0
      source/modules/dgl/src/Widget.cpp
  5. +8
    -5
      source/modules/dgl/src/Window.cpp
  6. +4
    -10
      source/modules/distrho/src/DistrhoUI.cpp
  7. +18
    -12
      source/modules/distrho/src/DistrhoUIInternal.hpp
  8. +20
    -4
      source/modules/distrho/src/DistrhoUILV2.cpp
  9. +12
    -9
      source/modules/distrho/src/lv2/lv2.h
  10. +98
    -102
      source/modules/distrho/src/lv2/ui.h

+ 9
- 1
source/modules/dgl/NanoVG.hpp View File

@@ -298,6 +298,11 @@ public:
*/
void beginFrame(int width, int height, float scaleFactor = 1.0f, Alpha alpha = PREMULTIPLIED_ALPHA);

/**
Begin drawing a new frame inside a widget.
*/
void beginFrame(Widget* widget);

/**
Ends drawing flushing remaining render state.
*/
@@ -794,7 +799,10 @@ public:
*/
NanoWidget(Window& parent)
: Widget(parent),
NanoVG() {}
NanoVG()
{
setNeedsScaling(true);
}

protected:
/**


+ 10
- 1
source/modules/dgl/Widget.hpp View File

@@ -297,16 +297,25 @@ protected:
virtual void onResize(const ResizeEvent&);

/**
Tell the parent window this widget this the full viewport.
Tell the parent window this widget needs the full viewport.
When enabled, the local widget coordinates are ignored.
@note: This is an internal function;
You do not need it under normal circumstances.
*/
void setNeedsFullViewport(bool yesNo) noexcept;

/**
Tell the parent window this widget needs scaling.
When enabled, the widget viewport is scaled to match width&height.
@note: This is an internal function;
You do not need it under normal circumstances.
*/
void setNeedsScaling(bool yesNo) noexcept;

private:
Window& fParent;
bool fNeedsFullViewport;
bool fNeedsScaling;
bool fVisible;
Rectangle<int> fArea;



+ 9
- 0
source/modules/dgl/src/NanoVG.cpp View File

@@ -15,6 +15,7 @@
*/

#include "../NanoVG.hpp"
#include "../Window.hpp"

// -----------------------------------------------------------------------

@@ -182,6 +183,14 @@ void NanoVG::beginFrame(int width, int height, float scaleFactor, Alpha alpha)
nvgBeginFrame(fContext, width, height, scaleFactor, static_cast<NVGalpha>(alpha));
}

void NanoVG::beginFrame(Widget* widget)
{
DISTRHO_SAFE_ASSERT_RETURN(widget != nullptr,);

Window& window(widget->getParentWindow());
nvgBeginFrame(fContext, window.getWidth(), window.getHeight(), 1.0f, NVG_PREMULTIPLIED_ALPHA);
}

void NanoVG::endFrame()
{
nvgEndFrame(fContext);


+ 6
- 0
source/modules/dgl/src/Widget.cpp View File

@@ -25,6 +25,7 @@ START_NAMESPACE_DGL
Widget::Widget(Window& parent)
: fParent(parent),
fNeedsFullViewport(false),
fNeedsScaling(false),
fVisible(true)
{
fParent._addWidget(this);
@@ -230,6 +231,11 @@ void Widget::setNeedsFullViewport(bool yesNo) noexcept
fNeedsFullViewport = yesNo;
}

void Widget::setNeedsScaling(bool yesNo) noexcept
{
fNeedsScaling = yesNo;
}

// -----------------------------------------------------------------------

END_NAMESPACE_DGL

+ 8
- 5
source/modules/dgl/src/Window.cpp View File

@@ -55,8 +55,6 @@ extern "C" {

START_NAMESPACE_DGL

Window* dgl_lastUiParent = nullptr;

// -----------------------------------------------------------------------
// Window Private

@@ -162,12 +160,9 @@ struct Window::PrivateData {
if (fSelf == nullptr || fView == nullptr)
{
DBG("Failed!\n");
dgl_lastUiParent = nullptr;
return;
}

dgl_lastUiParent = fSelf;

puglInitResizable(fView, fResizable);

puglSetHandle(fView, this);
@@ -584,6 +579,14 @@ struct Window::PrivateData {
// display widget
widget->onDisplay();
}
else if (! widget->fNeedsScaling)
{
// only set viewport pos
glViewport(widget->getAbsoluteX(), /*fView->height - widget->getHeight()*/ - widget->getAbsoluteY(), fView->width, fView->height);

// display widget
widget->onDisplay();
}
else
{
// limit viewport to widget bounds


+ 4
- 10
source/modules/distrho/src/DistrhoUI.cpp View File

@@ -16,28 +16,22 @@

#include "DistrhoUIInternal.hpp"

START_NAMESPACE_DGL
extern Window* dgl_lastUiParent;
END_NAMESPACE_DGL

START_NAMESPACE_DISTRHO

// -----------------------------------------------------------------------
// Static data, see DistrhoUIInternal.hpp

double d_lastUiSampleRate = 0.0;
double d_lastUiSampleRate = 0.0;
void* d_lastUiDspPtr = nullptr;
Window* d_lastUiWindow = nullptr;

// -----------------------------------------------------------------------
// UI

UI::UI()
: UIWidget(*DGL::dgl_lastUiParent),
: UIWidget(*d_lastUiWindow),
pData(new PrivateData())
{
DISTRHO_SAFE_ASSERT(DGL::dgl_lastUiParent != nullptr);

DGL::dgl_lastUiParent = nullptr;

Widget::setNeedsFullViewport(true);
}



+ 18
- 12
source/modules/distrho/src/DistrhoUIInternal.hpp View File

@@ -31,7 +31,9 @@ START_NAMESPACE_DISTRHO
// -----------------------------------------------------------------------
// Static data, see DistrhoUI.cpp

extern double d_lastUiSampleRate;
extern double d_lastUiSampleRate;
extern void* d_lastUiDspPtr;
extern Window* d_lastUiWindow;

// -----------------------------------------------------------------------
// UI callbacks
@@ -65,7 +67,7 @@ struct UI::PrivateData {
: sampleRate(d_lastUiSampleRate),
parameterOffset(0),
#if DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
dspPtr(nullptr),
dspPtr(d_lastUiDspPtr),
#endif
editParamCallbackFunc(nullptr),
setParamCallbackFunc(nullptr),
@@ -127,12 +129,23 @@ struct UI::PrivateData {
// -----------------------------------------------------------------------
// Plugin Window, needed to take care of resize properly

static inline
UI* createUiWrapper(void* const dspPtr, Window* const window)
{
d_lastUiDspPtr = dspPtr;
d_lastUiWindow = window;
UI* const ret = createUI();
d_lastUiDspPtr = nullptr;
d_lastUiWindow = nullptr;
return ret;
}

class UIExporterWindow : public Window
{
public:
UIExporterWindow(App& app, const intptr_t winId)
UIExporterWindow(App& app, const intptr_t winId, void* const dspPtr)
: Window(app, winId),
fUi(createUI()),
fUi(createUiWrapper(dspPtr, this)),
fIsReady(false)
{
DISTRHO_SAFE_ASSERT_RETURN(fUi != nullptr,);
@@ -182,7 +195,7 @@ public:
const editParamFunc editParamCall, const setParamFunc setParamCall, const setStateFunc setStateCall, const sendNoteFunc sendNoteCall, const setSizeFunc setSizeCall,
void* const dspPtr = nullptr)
: glApp(),
glWindow(glApp, winId),
glWindow(glApp, winId, dspPtr),
fUi(glWindow.getUI()),
fData((fUi != nullptr) ? fUi->pData : nullptr)
{
@@ -195,13 +208,6 @@ public:
fData->setStateCallbackFunc = setStateCall;
fData->sendNoteCallbackFunc = sendNoteCall;
fData->setSizeCallbackFunc = setSizeCall;

#if DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
fData->dspPtr = dspPtr;
#else
return; // unused
(void)dspPtr;
#endif
}

// -------------------------------------------------------------------


+ 20
- 4
source/modules/distrho/src/DistrhoUILV2.cpp View File

@@ -47,9 +47,7 @@ public:
fKeyValueURID(uridMap->map(uridMap->handle, "urn:distrho:keyValueState")),
fWinIdWasNull(winId == 0)
{
if (winId == 0)
fUI.setTitle(fUI.getName());
else if (fUiResize != nullptr)
if (fUiResize != nullptr && winId != 0)
fUiResize->ui_resize(fUiResize->handle, fUI.getWidth(), fUI.getHeight());

#if DISTRHO_PLUGIN_WANT_STATE
@@ -60,8 +58,11 @@ public:
if (winId != 0)
return;

const LV2_URID uridWindowTitle(uridMap->map(uridMap->handle, LV2_UI__windowTitle));
const LV2_URID uridFrontendWinId(uridMap->map(uridMap->handle, "http://kxstudio.sf.net/ns/carla/frontendWinId"));

bool hasTitle = false;

for (int i=0; options[i].key != 0; ++i)
{
if (options[i].key == uridFrontendWinId)
@@ -73,9 +74,24 @@ public:
}
else
d_stderr("Host provides frontendWinId but has wrong value type");
break;
}
else if (options[i].key == uridWindowTitle)
{
if (options[i].type == uridMap->map(uridMap->handle, LV2_ATOM__String))
{
if (const char* const windowTitle = (const char*)options[i].value)
{
hasTitle = true;
fUI.setTitle(windowTitle);
}
}
else
d_stderr("Host provides windowTitle but has wrong value type");
}
}

if (! hasTitle)
fUI.setTitle(fUI.getName());
}

// -------------------------------------------------------------------


+ 12
- 9
source/modules/distrho/src/lv2/lv2.h View File

@@ -353,19 +353,15 @@ typedef struct _LV2_Descriptor {
/**
Prototype for plugin accessor function.

This is part of the old discovery API, which has been replaced due to being
inadequate for some plugins. It is limited because the bundle path is not
available during discovery, and it relies on non-portable shared library
constructors/destructors. However, this API is still supported and plugins
are not required to migrate.

Plugins are discovered by hosts using RDF data (not by loading libraries).
See http://lv2plug.in for details on the discovery process, though most
hosts should use an existing library to implement this functionality.

A plugin library MUST include a function called "lv2_descriptor" with this
prototype. This function MUST have C-style linkage (if you are using C++
this is taken care of by the 'extern "C"' clause at the top of this file).
This is the simple plugin discovery API, suitable for most statically
defined plugins. Advanced plugins that need access to their bundle during
discovery can use lv2_lib_descriptor() instead. Plugin libraries MUST
include a function called "lv2_descriptor" or "lv2_lib_descriptor" with
C-style linkage, but SHOULD provide "lv2_descriptor" wherever possible.

When it is time to load a plugin (designated by its URI), the host loads the
plugin's library, gets the lv2_descriptor() function from it, and uses this
@@ -431,6 +427,13 @@ typedef struct {
/**
Prototype for library accessor function.

This is the more advanced discovery API, which allows plugin libraries to
access their bundles during discovery, which makes it possible for plugins to
be dynamically defined by files in their bundle. This API also has an
explicit cleanup function, removing any need for non-portable shared library
destructors. Simple plugins that do not require these features may use
lv2_descriptor() instead.

This is the entry point for a plugin library. Hosts load this symbol from
the library and call this function to obtain a library descriptor which can
be used to access all the contained plugins. The returned object must not


+ 98
- 102
source/modules/distrho/src/lv2/ui.h View File

@@ -1,6 +1,6 @@
/*
LV2 UI Extension
Copyright 2009-2013 David Robillard <d@drobilla.net>
Copyright 2009-2014 David Robillard <d@drobilla.net>
Copyright 2006-2011 Lars Luthman <lars.luthman@gmail.com>

Permission to use, copy, modify, and/or distribute this software for any
@@ -17,8 +17,9 @@
*/

/**
@file ui.h
C header for the LV2 UI extension <http://lv2plug.in/ns/extensions/ui>.
@file ui.h User Interface API.

For high-level documentation, see <http://lv2plug.in/ns/extensions/ui>.
*/

#ifndef LV2_UI_H
@@ -55,6 +56,7 @@
#define LV2_UI__touch LV2_UI_PREFIX "touch"
#define LV2_UI__ui LV2_UI_PREFIX "ui"
#define LV2_UI__updateRate LV2_UI_PREFIX "updateRate"
#define LV2_UI__windowTitle LV2_UI_PREFIX "windowTitle"

/**
The index returned by LV2_UI_Port_Port::port_index() for unknown ports.
@@ -75,20 +77,16 @@ extern "C" {
typedef void* LV2UI_Widget;

/**
A pointer to an instance of a UI.
A pointer to UI instance internals.

It is valid to compare this to NULL (0 for C++) but otherwise the host MUST
not attempt to interpret it. The UI plugin may use it to reference internal
instance data.
The host may compare this to NULL, but otherwise MUST NOT interpret it.
*/
typedef void* LV2UI_Handle;

/**
A pointer to a controller provided by the host.

It is valid to compare this to NULL (0 for C++) but otherwise the UI plugin
MUST NOT attempt to interpret it. The host may use it to reference internal
instance data.
The UI may compare this to NULL, but otherwise MUST NOT interpret it.
*/
typedef void* LV2UI_Controller;

@@ -98,22 +96,20 @@ typedef void* LV2UI_Controller;
typedef void* LV2UI_Feature_Handle;

/**
The type of the host-provided function that the UI can use to
send data to a plugin's input ports.
A host-provided function that sends data to a plugin's input ports.

The @p buffer parameter must point to a block of data, @c buffer_size bytes
The @p buffer parameter must point to a block of data, @p buffer_size bytes
large. The format of this data and how the host should use it is defined by
the @p port_protocol. This buffer is owned by the UI and is only valid for
the duration of this call.

The @p port_protocol parameter should either be 0 or the URID for a
ui:PortProtocol. If it is 0, the protocol is implicitly ui:floatProtocol,
the port must be an lv2:ControlPort input, @c buffer must point to a single
float value, and @c buffer_size must be sizeof(float).
the port MUST be an lv2:ControlPort input, @p buffer MUST point to a single
float value, and @p buffer_size MUST be sizeof(float).

The UI SHOULD NOT use a PortProtocol not supported by the host (i.e. one not
passed by the host as a feature), but the host MUST gracefully ignore any
port_protocol it does not understand.
The UI SHOULD NOT use a protocol not supported by the host, but the host
MUST gracefully ignore any protocol it does not understand.
*/
typedef void (*LV2UI_Write_Function)(LV2UI_Controller controller,
uint32_t port_index,
@@ -122,7 +118,7 @@ typedef void (*LV2UI_Write_Function)(LV2UI_Controller controller,
const void* buffer);

/**
The implementation of a UI.
A plugin UI.

A pointer to an object of this type is returned by the lv2ui_descriptor()
function.
@@ -134,32 +130,29 @@ typedef struct _LV2UI_Descriptor {
const char* URI;

/**
Create a new UI object and return a handle to it. This function works
similarly to the instantiate() member in LV2_Descriptor.
Create a new UI and return a handle to it. This function works
similarly to LV2_Descriptor::instantiate().

@param descriptor The descriptor for the UI that you want to instantiate.
@param descriptor The descriptor for the UI to instantiate.

@param plugin_uri The URI of the plugin that this UI will control.

@param bundle_path The path to the bundle containing the RDF data file
that references this shared object file, including the trailing '/'.
@param bundle_path The path to the bundle containing this UI, including
the trailing directory separator.

@param write_function A function provided by the host that the UI can use
to send data to the plugin's input ports.
@param write_function A function that the UI can use to send data to the
plugin's input ports.

@param controller A handle for the plugin instance that should be passed
as the first parameter of @p write_function.
@param controller A handle for the plugin instance to be passed as the
first parameter of UI methods.

@param widget A pointer to an LV2UI_Widget. The UI will write a widget
pointer to this location (what type of widget depends on the RDF class of
the UI) that will be the main UI widget.
@param widget (output) widget pointer. The UI points this at its main
widget, which has the type defined by the UI type in the data file.

@param features An array of LV2_Feature pointers. The host must pass all
feature URIs that it and the UI supports and any additional data, just
like in the LV2 plugin instantiate() function. Note that UI features and
plugin features are NOT necessarily the same, they just share the same
data structure - this will probably not be the same array as the one the
plugin host passes to a plugin.
@param features An array of LV2_Feature pointers. The host must pass
all feature URIs that it and the UI supports and any additional data, as
in LV2_Descriptor::instantiate(). Note that UI features and plugin
features are not necessarily the same.

*/
LV2UI_Handle (*instantiate)(const struct _LV2UI_Descriptor* descriptor,
@@ -172,33 +165,29 @@ typedef struct _LV2UI_Descriptor {


/**
Destroy the UI object and the associated widget. The host must not try
to access the widget after calling this function.
Destroy the UI. The host must not try to access the widget after
calling this function.
*/
void (*cleanup)(LV2UI_Handle ui);

/**
Tell the UI that something interesting has happened at a plugin port.

What is interesting and how it is written to the buffer passed to this
function is defined by the @p format parameter, which has the same
meaning as in LV2UI_Write_Function. The only exception is ports of the
class lv2:ControlPort, for which this function should be called when the
port value changes (it does not have to be called for every single change
if the host's UI thread has problems keeping up with the thread the
plugin is running in), @p buffer_size should be 4, the buffer should
contain a single IEEE-754 float, and @p format should be 0.

By default, the host should only call this function for input ports of
the lv2:ControlPort class. However, this can be modified by using
ui:portNotification in the UI data, or the ui:portSubscribe feature.

The @p buffer is only valid during the time of this function call, so if
the UI wants to keep it for later use it has to copy the contents to an
internal buffer.

This member may be set to NULL if the UI is not interested in any
port events.
What is "interesting" and how it is written to @p buffer is defined by
@p format, which has the same meaning as in LV2UI_Write_Function().
Format 0 is a special case for lv2:ControlPort, where this function
should be called when the port value changes (but not necessarily for
every change), @p buffer_size must be sizeof(float), and @p buffer
points to a single IEEE-754 float.

By default, the host should only call this function for lv2:ControlPort
inputs. However, the UI can request updates for other ports statically
with ui:portNotification or dynamicaly with ui:portSubscribe.

The UI MUST NOT retain any reference to @p buffer after this function
returns, it is only valid for the duration of the call.

This member may be NULL if the UI is not interested in any port events.
*/
void (*port_event)(LV2UI_Handle ui,
uint32_t port_index,
@@ -207,22 +196,21 @@ typedef struct _LV2UI_Descriptor {
const void* buffer);

/**
Return a data structure associated with an extension URI, for example
a struct containing additional function pointers.
Return a data structure associated with an extension URI, typically an
interface struct with additional function pointers

Avoid returning function pointers directly since standard C/C++ has no
valid way of casting a void* to a function pointer. This member may be set
to NULL if the UI is not interested in supporting any extensions. This is
similar to the extension_data() member in LV2_Descriptor.
This member may be set to NULL if the UI is not interested in supporting
any extensions. This is similar to LV2_Descriptor::extension_data().
*/
const void* (*extension_data)(const char* uri);
} LV2UI_Descriptor;

/**
UI Resize Feature (LV2_UI__resize)
Feature/interface for resizable UIs (LV2_UI__resize).

This structure may be used in two ways: as a feature passed by the host via
LV2UI_Descriptor::instantiate(), or as extension data provided by a UI via
This structure is used in two ways: as a feature passed by the host via
LV2UI_Descriptor::instantiate(), or as an interface provided by a UI via
LV2UI_Descriptor::extension_data()).
*/
typedef struct _LV2UI_Resize {
@@ -232,13 +220,13 @@ typedef struct _LV2UI_Resize {
LV2UI_Feature_Handle handle;

/**
Request or advertise a size change.
Request/advertise a size change.

When this struct is provided by the host, the UI may call this
function to inform the host about the size of the UI.
When provided by the host, the UI may call this function to inform the
host about the size of the UI.

When this struct is provided by the UI, the host may call this
function to notify the UI that it should change its size accordingly.
When provided by the UI, the host may call this function to notify the
UI that it should change its size accordingly.

@return 0 on success.
*/
@@ -246,16 +234,15 @@ typedef struct _LV2UI_Resize {
} LV2UI_Resize;

/**
Port Map Feature (LV2_UI__portMap).
Feature to map port symbols to UIs.

This feature can be used by the UI to get the index for a port with the
given symbol. This makes it possible to implement and distribute a UI
separately from the plugin (since symbol is a guaranteed stable port
identifier while index is not).
This can be used by the UI to get the index for a port with the given
symbol. This makes it possible to implement and distribute a UI separately
from the plugin (since symbol, unlike index, is a stable port identifier).
*/
typedef struct _LV2UI_Port_Map {
/**
Pointer to opaque data which must be passed to ui_resize().
Pointer to opaque data which must be passed to port_index().
*/
LV2UI_Feature_Handle handle;

@@ -269,11 +256,12 @@ typedef struct _LV2UI_Port_Map {
} LV2UI_Port_Map;

/**
Port subscription feature (LV2_UI__portSubscribe);
Feature to subscribe to port updates (LV2_UI__portSubscribe).
*/
typedef struct _LV2UI_Port_Subscribe {
/**
Pointer to opaque data which must be passed to ui_resize().
Pointer to opaque data which must be passed to subscribe() and
unsubscribe().
*/
LV2UI_Feature_Handle handle;

@@ -319,7 +307,7 @@ typedef struct _LV2UI_Port_Subscribe {
} LV2UI_Port_Subscribe;

/**
A feature to notify the host the user has grabbed a UI control.
A feature to notify the host that the user has grabbed a UI control.
*/
typedef struct _LV2UI_Touch {
/**
@@ -330,6 +318,9 @@ typedef struct _LV2UI_Touch {
/**
Notify the host that a control has been grabbed or released.

The host should cease automating the port or otherwise manipulating the
port value until the control has been ungrabbed.

@param handle The handle field of this struct.
@param port_index The index of the port associated with the control.
@param grabbed If true, the control has been grabbed, otherwise the
@@ -341,19 +332,23 @@ typedef struct _LV2UI_Touch {
} LV2UI_Touch;

/**
UI Idle Feature (LV2_UI__idleInterface)
UI Idle Interface (LV2_UI__idleInterface)

This feature is an addition to the UI API that provides a callback for the
host to call rapidly, e.g. to drive the idle callback of a toolkit.
UIs can provide this interface to have an idle() callback called by the host
rapidly to update the UI.
*/
typedef struct _LV2UI_Idle_Interface {
/**
Run a single iteration of the UI's idle loop.

This will be called "frequently" in the UI thread at a rate appropriate
for a toolkit main loop. There are no precise timing guarantees.
This will be called rapidly in the UI thread at a rate appropriate
for a toolkit main loop. There are no precise timing guarantees, but
the host should attempt to call idle() at a high enough rate for smooth
animation, at least 30Hz.

@return 0 on success, or anything else to stop being called.
@return non-zero if the UI has been closed, in which case the host
should stop calling idle(), and can either completely destroy the UI, or
re-show it and resume calling idle().
*/
int (*idle)(LV2UI_Handle ui);
} LV2UI_Idle_Interface;
@@ -361,16 +356,24 @@ typedef struct _LV2UI_Idle_Interface {
/**
UI Show Interface (LV2_UI__showInterface)

UIs can use this interface to provide show/hide methods to pop up a window,
which allows them to function in hosts unable to embed their widget type.
UIs can provide this interface to show and hide a window, which allows them
to function in hosts unable to embed their widget. This allows any UI to
provide a fallback for embedding that works in any host.

If used, LV2UI_Idle_Interface should also be used to drive the UI. The UI
should return non-zero from idle() when the window has been closed.
If used:
- The host MUST use LV2UI_Idle_Interface to drive the UI.
- The UI MUST return non-zero from LV2UI_Idle_Interface::idle() when it has been closed.
- If idle() returns non-zero, the host MUST call hide() and stop calling
idle(). It MAY later call show() then resume calling idle().
*/
typedef struct _LV2UI_Show_Interface {
/**
Show a window for this UI.

The window title MAY have been passed by the host to
LV2UI_Descriptor::instantiate() as an LV2_Options_Option with key
LV2_UI__windowTitle.

@return 0 on success, or anything else to stop being called.
*/
int (*show)(LV2UI_Handle ui);
@@ -407,17 +410,10 @@ typedef struct _LV2UI_Peak_Data {
} LV2UI_Peak_Data;

/**
A plugin UI programmer must include a function called "lv2ui_descriptor"
with the following function prototype within the shared object file. This
function will have C-style linkage (if you are using C++ this is taken care
of by the 'extern "C"' clause at the top of the file). This function is
loaded from the library by the UI host and called to get a
LV2UI_Descriptor for the wanted plugin.

Just like lv2_descriptor(), this function takes an index parameter. The
index should only be used for enumeration and not as any sort of ID number -
the host should just iterate from 0 and upwards until the function returns
NULL or a descriptor with an URI matching the one the host is looking for.
Prototype for UI accessor function.

This is the entry point to a UI library, which works in the same way as
lv2_descriptor() but for UIs rather than plugins.
*/
LV2_SYMBOL_EXPORT
const LV2UI_Descriptor* lv2ui_descriptor(uint32_t index);


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