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path: root/widgets_xy_pad.c
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/*
 * Copyright (c) 2018 Hanspeter Portner (dev@open-music-kontrollers.ch)
 *
 * This is free software: you can redistribute it and/or modify
 * it under the terms of the Artistic License 2.0 as published by
 * The Perl Foundation.
 *
 * This source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Artistic License 2.0 for more details.
 *
 * You should have received a copy of the Artistic License 2.0
 * along the source as a COPYING file. If not, obtain it from
 * http://www.perlfoundation.org/artistic_license_2_0.
 */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include <widgets.h>

#include <props.lv2/props.h>
#include <canvas.lv2/canvas.h>
#include <canvas.lv2/forge.h>

#define MAX_SAMPLES 512
#define MAX_GRAPH 0x20000 //FIXME actually measure this
#define MAX_NPROPS 8

typedef struct _plugstate_t plugstate_t;
typedef struct _plughandle_t plughandle_t;

struct _plugstate_t {
	// writable
	float aspect_ratio;
	float mouse_pos_x;
	float mouse_pos_y;
	int32_t mouse_but_left;
	int32_t mouse_focus;
	float x;
	float y;
	// readable
	uint8_t graph [MAX_GRAPH];
};

struct _plughandle_t {
	LV2_URID_Map *map;

	const LV2_Atom_Sequence *control;
	craft_t notify;

	LV2_Canvas_URID urid;
	double sample_rate;
	float update_rate;

	uint32_t spf;
	uint32_t thresh;

	struct {
		float x;
		float y;
	} last;

	plugstate_t state;
	plugstate_t stash;

	bool dirty;

	PROPS_T(props, MAX_NPROPS);
};

#define A 0.05f
#define B (1.f - 2*A)

#define SCALE(v) (B*v)
#define MAP(v) (A + SCALE(v))

static void
_render(plughandle_t *handle)
{
	LV2_Atom_Forge _forge = handle->notify.forge; // clone forge object
	LV2_Atom_Forge *forge = &_forge;
	LV2_Canvas_URID *urid = &handle->urid;
	LV2_Atom_Forge_Frame frame;

	lv2_atom_forge_set_buffer(forge, handle->state.graph, MAX_GRAPH);

	const float x = MAP(handle->state.x);
	const float y = MAP(handle->state.y);

	const float hor [4] = {
		0.f, y,
		1.f, y
	};

	const float ver [4] = {
		x, 0.f,
		x, 1.f
	};

	if( lv2_atom_forge_tuple(forge, &frame)
	&&	lv2_canvas_forge_rectangle(forge, urid, 0.f, 0.f, 1.f, 1.f)
	&&	lv2_canvas_forge_style(forge, urid, 0x0000003f)
	&&	lv2_canvas_forge_fill(forge, urid)

	&&	lv2_canvas_forge_rectangle(forge, urid, MAP(0.f), MAP(0.f), SCALE(1.f), SCALE(1.f))
	&&	lv2_canvas_forge_style(forge, urid, 0xffffff7f)
	&&	lv2_canvas_forge_lineWidth(forge, urid, 0.01f)
	&&	lv2_canvas_forge_stroke(forge, urid)

	&&	lv2_canvas_forge_arc(forge, urid, x, y, 0.05f, 0.f, M_PI*2)
	&&	lv2_canvas_forge_style(forge, urid, handle->state.mouse_but_left ? 0xff7f00ff : 0xff7f007f)
	&&	lv2_canvas_forge_stroke(forge, urid)

	&&	lv2_canvas_forge_arc(forge, urid, x, y, 0.025f, 0.f, M_PI*2)
	&&	lv2_canvas_forge_style(forge, urid, 0xff7f00ff)
	&&	lv2_canvas_forge_fill(forge, urid)

	&&	lv2_canvas_forge_polyLine(forge, urid, 4, hor)
	&&	lv2_canvas_forge_stroke(forge, urid)

	&&	lv2_canvas_forge_polyLine(forge, urid, 4, ver)
	&&	lv2_canvas_forge_stroke(forge, urid) )
	{
		lv2_atom_forge_pop(forge, &frame);

		props_impl_t *impl = _props_impl_get(&handle->props, handle->urid.Canvas_graph);
		if(impl)
		{
			const LV2_Atom *value= (const LV2_Atom *)handle->state.graph;

			_props_impl_set(&handle->props, impl, value->type, value->size,
				LV2_ATOM_BODY_CONST(value));
		}
	}
}

static void
_intercept_mouse_pos_x(void *data, int64_t frames, props_impl_t *impl)
{
	plughandle_t *handle = data;

	if(handle->state.mouse_but_left)
	{
		handle->state.x += handle->state.mouse_pos_x - handle->last.x;
		if(handle->state.x < 0.f)
			handle->state.x = 0.f;
		else if(handle->state.x > 1.f)
			handle->state.x = 1.f;

		const LV2_URID widgets_x = props_map(&handle->props, WIDGETS__x);
		props_set(&handle->props, &handle->notify.forge, frames,
			widgets_x, &handle->notify.ref);

		handle->dirty = true;
	}

	handle->last.x = handle->state.mouse_pos_x;
}

static void
_intercept_mouse_pos_y(void *data, int64_t frames, props_impl_t *impl)
{
	plughandle_t *handle = data;

	if(handle->state.mouse_but_left)
	{
		handle->state.y += handle->state.mouse_pos_y - handle->last.y;
		if(handle->state.y < 0.f)
			handle->state.y = 0.f;
		else if(handle->state.y > 1.f)
			handle->state.y = 1.f;

		const LV2_URID widgets_y = props_map(&handle->props, WIDGETS__y);
		props_set(&handle->props, &handle->notify.forge, frames,
			widgets_y, &handle->notify.ref);

		handle->dirty = true;
	}

	handle->last.y = handle->state.mouse_pos_y;
}

static void
_intercept_mouse_focus(void *data, int64_t frames, props_impl_t *impl)
{
	plughandle_t *handle = data;

	if(!handle->state.mouse_focus)
	{
		handle->state.mouse_but_left = 0;

		props_set(&handle->props, &handle->notify.forge, frames,
			handle->urid.Canvas_mouseButtonLeft, &handle->notify.ref);

		handle->dirty = true;
	}
}

static void
_intercept_dirty(void *data, int64_t frames, props_impl_t *impl)
{
	plughandle_t *handle = data;

	handle->dirty = true;
}

static const props_def_t defs [MAX_NPROPS] = {
	// readable
	{
		.access = LV2_PATCH__readable,
		.property = CANVAS__graph,
		.offset = offsetof(plugstate_t, graph),
		.type = LV2_ATOM__Tuple,
		.max_size = MAX_GRAPH
	},
	// writable
	{
		.property = WIDGETS__x,
		.offset = offsetof(plugstate_t, x),
		.type = LV2_ATOM__Float,
		.event_cb = _intercept_dirty
	},
	{
		.property = WIDGETS__y,
		.offset = offsetof(plugstate_t, y),
		.type = LV2_ATOM__Float,
		.event_cb = _intercept_dirty
	},
	{
		.property = CANVAS__aspectRatio,
		.offset = offsetof(plugstate_t, aspect_ratio),
		.type = LV2_ATOM__Float
	},
	{
		.property = CANVAS__mousePositionX,
		.offset = offsetof(plugstate_t, mouse_pos_x),
		.type = LV2_ATOM__Float,
		.event_cb = _intercept_mouse_pos_x
	},
	{
		.property = CANVAS__mousePositionY,
		.offset = offsetof(plugstate_t, mouse_pos_y),
		.type = LV2_ATOM__Float,
		.event_cb = _intercept_mouse_pos_y
	},
	{
		.property = CANVAS__mouseButtonLeft,
		.offset = offsetof(plugstate_t, mouse_but_left),
		.type = LV2_ATOM__Bool,
		.event_cb = _intercept_dirty
	},
	{
		.property = CANVAS__mouseFocus,
		.offset = offsetof(plugstate_t, mouse_focus),
		.type = LV2_ATOM__Bool,
		.event_cb = _intercept_mouse_focus
	}
};

static LV2_Handle
instantiate(const LV2_Descriptor* descriptor, double rate,
	const char *bundle_path, const LV2_Feature *const *features)
{
	plughandle_t *handle = calloc(1, sizeof(plughandle_t));
	if(!handle)
		return NULL;
	mlock(handle, sizeof(plughandle_t));

	LV2_Options_Option *opts = NULL;
	for(unsigned i=0; features[i]; i++)
	{
		if(!strcmp(features[i]->URI, LV2_URID__map))
			handle->map = features[i]->data;
		else if(!strcmp(features[i]->URI, LV2_OPTIONS__options))
			opts = features[i]->data;
	}

	if(!handle->map)
	{
		fprintf(stderr,
			"%s: Host does not support urid:map\n", descriptor->URI);
		free(handle);
		return NULL;
	}

	if(!opts)
	{
		fprintf(stderr,
			"%s: Host does not support opts:options\n", descriptor->URI);
		free(handle);
		return NULL;
	}

	_craft_init(&handle->notify, handle->map);
	lv2_canvas_urid_init(&handle->urid, handle->map);

	const LV2_URID ui_update_rate= handle->map->map(handle->map->handle,
		LV2_UI__updateRate);

	handle->update_rate = 60.f; // fall-back
	handle->sample_rate = rate;

	for(LV2_Options_Option *opt = opts;
		opt && (opt->key != 0) && (opt->value != NULL);
		opt++)
	{
		if( (opt->key == ui_update_rate) && (opt->type == handle->notify.forge.Float) )
			handle->update_rate = *(float*)opt->value;
	}

	handle->spf = handle->sample_rate / handle->update_rate;

	if(!props_init(&handle->props, descriptor->URI,
		defs, MAX_NPROPS, &handle->state, &handle->stash,
		handle->map, handle))
	{
		fprintf(stderr, "failed to initialize property structure\n");
		free(handle);
		return NULL;
	}

	handle->state.x = 0.5f;
	handle->state.y = 0.5f;

	_render(handle);

	return handle;
}

static void
connect_port(LV2_Handle instance, uint32_t port, void *data)
{
	plughandle_t *handle = (plughandle_t *)instance;

	switch(port)
	{
		case 0:
			handle->control = (const void *)data;
			break;
		case 1:
			_craft_connect(&handle->notify, data);
			break;

		default:
			break;
	}
}

static void
_run(plughandle_t *handle, uint32_t from, uint32_t to)
{
	const uint32_t num = (to - from);

	for(uint32_t i = 0; i < num; i++, handle->thresh++)
	{
		if(handle->thresh >= handle->spf)
		{
			handle->thresh = 0;

			if(handle->dirty)
			{
				_render(handle);
				props_set(&handle->props, &handle->notify.forge, from + i,
					handle->urid.Canvas_graph, &handle->notify.ref);

				handle->dirty = false;
			}
		}
	}
}

static void
run(LV2_Handle instance, uint32_t nsamples)
{
	plughandle_t *handle = instance;

	_craft_in(&handle->notify);

	props_idle(&handle->props, &handle->notify.forge, 0, &handle->notify.ref);

	int64_t from = 0;

	LV2_ATOM_SEQUENCE_FOREACH(handle->control, ev)
	{
		const LV2_Atom *atom = &ev->body;
		const LV2_Atom_Object *obj = (const LV2_Atom_Object *)atom;

		if(props_advance(&handle->props, &handle->notify.forge, ev->time.frames, obj, &handle->notify.ref))
		{
			const int64_t to = ev->time.frames;

			_run(handle, from, to);

			from = to;
		}
	}

	{
		const int64_t to = nsamples;

		_run(handle, from, to);
	}

	_craft_out(&handle->notify);
}

static void
cleanup(LV2_Handle instance)
{
	plughandle_t *handle = instance;

	munlock(handle, sizeof(plughandle_t));
	free(handle);
}

static LV2_State_Status
_state_save(LV2_Handle instance, LV2_State_Store_Function store,
	LV2_State_Handle state, uint32_t flags,
	const LV2_Feature *const *features)
{
	plughandle_t *handle = instance;

	return props_save(&handle->props, store, state, flags, features);
}

static LV2_State_Status
_state_restore(LV2_Handle instance, LV2_State_Retrieve_Function retrieve,
	LV2_State_Handle state, uint32_t flags,
	const LV2_Feature *const *features)
{
	plughandle_t *handle = instance;

	return props_restore(&handle->props, retrieve, state, flags, features);
}

static const LV2_State_Interface state_iface = {
	.save = _state_save,
	.restore = _state_restore
};

static const void*
extension_data(const char* uri)
{
	if(!strcmp(uri, LV2_STATE__interface))
		return &state_iface;

	return NULL;
}

const LV2_Descriptor widgets_xy_pad= {
	.URI						= WIDGETS__xy_pad,
	.instantiate		= instantiate,
	.connect_port		= connect_port,
	.activate				= NULL,
	.run						= run,
	.deactivate			= NULL,
	.cleanup				= cleanup,
	.extension_data	= extension_data
};