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rockbox/apps/plugins/demystify.c
Andrew Mahone 23d9812273 loader-initialized global plugin API: 
struct plugin_api *rb is declared in PLUGIN_HEADER, and pointed to by
__header.api

the loader uses this pointer to initialize rb before calling entry_point

entry_point is no longer passed a pointer to the plugin API

all plugins, and pluginlib functions, are modified to refer to the
global rb

pluginlib functions which only served to copy the API pointer are
removed

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19776 a1c6a512-1295-4272-9138-f99709370657
2009-01-16 10:34:40 +00:00

444 lines
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Kevin Ferrare
*
* Mystify demo plugin
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#ifdef HAVE_LCD_BITMAP
#include "lib/pluginlib_actions.h"
#include "lib/helper.h"
PLUGIN_HEADER
#define DEFAULT_WAIT_TIME 3
#define DEFAULT_NB_POLYGONS 7
#define NB_POINTS 4
#define MAX_STEP_RANGE 7
#define MIN_STEP_RANGE 3
#define MAX_POLYGONS 40
#define MIN_POLYGONS 1
/* Key assignement */
#define DEMYSTIFY_QUIT PLA_QUIT
#define DEMYSTIFY_INCREASE_SPEED PLA_RIGHT
#define DEMYSTIFY_DECREASE_SPEED PLA_LEFT
#define DEMYSTIFY_INCREASE_SPEED_REPEAT PLA_RIGHT_REPEAT
#define DEMYSTIFY_DECREASE_SPEED_REPEAT PLA_LEFT_REPEAT
#define DEMYSTIFY_ADD_POLYGON PLA_UP
#define DEMYSTIFY_REMOVE_POLYGON PLA_DOWN
#define DEMYSTIFY_ADD_POLYGON_REPEAT PLA_UP_REPEAT
#define DEMYSTIFY_REMOVE_POLYGON_REPEAT PLA_DOWN_REPEAT
const struct button_mapping *plugin_contexts[]
= {generic_directions, generic_actions,
#if defined(HAVE_REMOTE_LCD)
remote_directions
#endif
};
#define NB_ACTION_CONTEXTS \
sizeof(plugin_contexts)/sizeof(struct button_mapping*)
#ifdef HAVE_LCD_COLOR
struct line_color
{
int r,g,b;
int current_r,current_g,current_b;
};
#endif
/******************************* Globals ***********************************/
/*
* Compute a new random step to make the point bounce the borders of the screen
*/
int get_new_step(int step)
{
if(step>0)
return -(MIN_STEP_RANGE + rb->rand() % (MAX_STEP_RANGE-MIN_STEP_RANGE));
else
return (MIN_STEP_RANGE + rb->rand() % (MAX_STEP_RANGE-MIN_STEP_RANGE));
}
/*
* Point Stuffs
*/
struct point
{
int x;
int y;
};
/*
* Polygon Stuffs
*/
struct polygon
{
struct point points[NB_POINTS];
};
/*
* Generates a random polygon (which fits the screen size though)
*/
void polygon_init(struct polygon * polygon, struct screen * display)
{
int i;
for(i=0;i<NB_POINTS;++i)
{
polygon->points[i].x=(rb->rand() % (display->getwidth()));
polygon->points[i].y=(rb->rand() % (display->getheight()));
}
}
/*
* Draw the given polygon onto the screen
*/
void polygon_draw(struct polygon * polygon, struct screen * display)
{
int i;
for(i=0;i<NB_POINTS-1;++i)
{
display->drawline(polygon->points[i].x, polygon->points[i].y,
polygon->points[i+1].x, polygon->points[i+1].y);
}
display->drawline(polygon->points[0].x, polygon->points[0].y,
polygon->points[NB_POINTS-1].x,
polygon->points[NB_POINTS-1].y);
}
/*
* Polygon moving data Stuffs
*/
struct polygon_move
{
struct point move_steps[NB_POINTS];
};
void polygon_move_init(struct polygon_move * polygon_move)
{
int i;
for(i=0;i<NB_POINTS;++i)
{
polygon_move->move_steps[i].x=get_new_step(-1);
/* -1 because we want a positive random step */
polygon_move->move_steps[i].y=get_new_step(-1);
}
}
/*
* Update the given polygon's position according to the given informations in
* polygon_move (polygon_move may be updated)
*/
void polygon_update(struct polygon *polygon, struct screen * display, struct polygon_move *polygon_move)
{
int i, x, y, step;
for(i=0;i<NB_POINTS;++i)
{
x=polygon->points[i].x;
step=polygon_move->move_steps[i].x;
x+=step;
if(x<=0)
{
x=1;
polygon_move->move_steps[i].x=get_new_step(step);
}
else if(x>=display->getwidth())
{
x=display->getwidth()-1;
polygon_move->move_steps[i].x=get_new_step(step);
}
polygon->points[i].x=x;
y=polygon->points[i].y;
step=polygon_move->move_steps[i].y;
y+=step;
if(y<=0)
{
y=1;
polygon_move->move_steps[i].y=get_new_step(step);
}
else if(y>=display->getheight())
{
y=display->getheight()-1;
polygon_move->move_steps[i].y=get_new_step(step);
}
polygon->points[i].y=y;
}
}
/*
* Polygon fifo Stuffs
*/
struct polygon_fifo
{
int fifo_tail;
int fifo_head;
int nb_items;
struct polygon tab[MAX_POLYGONS];
};
void fifo_init(struct polygon_fifo * fifo)
{
fifo->fifo_tail=0;
fifo->fifo_head=0;
fifo->nb_items=0;
}
void fifo_push(struct polygon_fifo * fifo, struct polygon * polygon)
{
if(fifo->nb_items>=MAX_POLYGONS)
return;
++(fifo->nb_items);
/*
* Workaround for gcc (which uses memcpy internally) to avoid link error
* fifo->tab[fifo->fifo_head]=polygon
*/
rb->memcpy(&(fifo->tab[fifo->fifo_head]), polygon, sizeof(struct polygon));
++(fifo->fifo_head);
if(fifo->fifo_head>=MAX_POLYGONS)
fifo->fifo_head=0;
}
struct polygon * fifo_pop(struct polygon_fifo * fifo)
{
int index;
if(fifo->nb_items==0)
return(NULL);
--(fifo->nb_items);
index=fifo->fifo_tail;
++(fifo->fifo_tail);
if(fifo->fifo_tail>=MAX_POLYGONS)
fifo->fifo_tail=0;
return(&(fifo->tab[index]));
}
/*
* Drawing stuffs
*/
void polygons_draw(struct polygon_fifo * polygons, struct screen * display)
{
int i, j;
for(i=0, j=polygons->fifo_tail;i<polygons->nb_items;++i, ++j)
{
if(j>=MAX_POLYGONS)
j=0;
polygon_draw(&(polygons->tab[j]), display);
}
}
void cleanup(void *parameter)
{
(void)parameter;
backlight_use_settings();
#ifdef HAVE_REMOTE_LCD
remote_backlight_use_settings();
#endif
}
#ifdef HAVE_LCD_COLOR
void color_randomize(struct line_color * color)
{
color->r = rb->rand()%255;
color->g = rb->rand()%255;
color->b = rb->rand()%255;
}
void color_init(struct line_color * color)
{
color_randomize(color);
color->current_r=color->r;
color->current_g=color->g;
color->current_b=color->b;
}
void color_change(struct line_color * color)
{
if(color->current_r<color->r)
++color->current_r;
else if(color->current_r>color->r)
--color->current_r;
if(color->current_g<color->g)
++color->current_g;
else if(color->current_g>color->g)
--color->current_g;
if(color->current_b<color->b)
++color->current_b;
else if(color->current_b>color->b)
--color->current_b;
if(color->current_r==color->r &&
color->current_g==color->g &&
color->current_b==color->b)
color_randomize(color);
}
#define COLOR_RGBPACK(color) \
LCD_RGBPACK((color)->current_r, (color)->current_g, (color)->current_b)
void color_apply(struct line_color * color, struct screen * display)
{
if (display->is_color){
unsigned foreground=
SCREEN_COLOR_TO_NATIVE(display,COLOR_RGBPACK(color));
display->set_foreground(foreground);
}
}
#endif
/*
* Main function
*/
int plugin_main(void)
{
int action;
int sleep_time=DEFAULT_WAIT_TIME;
int nb_wanted_polygons=DEFAULT_NB_POLYGONS;
int i;
struct polygon_fifo polygons[NB_SCREENS];
struct polygon_move move[NB_SCREENS]; /* This describes the movement of the leading
polygon, the others just follow */
struct polygon leading_polygon[NB_SCREENS];
FOR_NB_SCREENS(i)
{
#ifdef HAVE_LCD_COLOR
struct screen *display = rb->screens[i];
if (display->is_color)
display->set_background(LCD_BLACK);
#endif
fifo_init(&polygons[i]);
polygon_move_init(&move[i]);
polygon_init(&leading_polygon[i], rb->screens[i]);
}
#ifdef HAVE_LCD_COLOR
struct line_color color;
color_init(&color);
#endif
while (true)
{
FOR_NB_SCREENS(i)
{
struct screen * display=rb->screens[i];
if(polygons[i].nb_items>nb_wanted_polygons)
{ /* We have too many polygons, we must drop some of them */
fifo_pop(&polygons[i]);
}
if(nb_wanted_polygons==polygons[i].nb_items)
{ /* We have the good number of polygons, we can safely drop
the last one to add the new one later */
fifo_pop(&polygons[i]);
}
fifo_push(&polygons[i], &leading_polygon[i]);
/*
* Then we update the leading polygon for the next round acording to
* current move (the move may be altered in case of sreen border
* collision)
*/
polygon_update(&leading_polygon[i], display, &move[i]);
/* Now the drawing part */
#ifdef HAVE_LCD_COLOR
color_apply(&color, display);
#endif
display->clear_display();
polygons_draw(&polygons[i], display);
display->update();
}
#ifdef HAVE_LCD_COLOR
color_change(&color);
#endif
/* Speed handling*/
if (sleep_time<0)/* full speed */
rb->yield();
else
rb->sleep(sleep_time);
action = pluginlib_getaction(TIMEOUT_NOBLOCK,
plugin_contexts, NB_ACTION_CONTEXTS);
switch(action)
{
case DEMYSTIFY_QUIT:
cleanup(NULL);
return PLUGIN_OK;
case DEMYSTIFY_ADD_POLYGON:
case DEMYSTIFY_ADD_POLYGON_REPEAT:
if(nb_wanted_polygons<MAX_POLYGONS)
++nb_wanted_polygons;
break;
case DEMYSTIFY_REMOVE_POLYGON:
case DEMYSTIFY_REMOVE_POLYGON_REPEAT:
if(nb_wanted_polygons>MIN_POLYGONS)
--nb_wanted_polygons;
break;
case DEMYSTIFY_INCREASE_SPEED:
case DEMYSTIFY_INCREASE_SPEED_REPEAT:
if(sleep_time>=0)
--sleep_time;
break;
case DEMYSTIFY_DECREASE_SPEED:
case DEMYSTIFY_DECREASE_SPEED_REPEAT:
++sleep_time;
break;
default:
if (rb->default_event_handler_ex(action, cleanup, NULL)
== SYS_USB_CONNECTED)
return PLUGIN_USB_CONNECTED;
break;
}
}
}
/*************************** Plugin entry point ****************************/
enum plugin_status plugin_start(const void* parameter)
{
int ret;
(void)parameter;
#if LCD_DEPTH > 1
rb->lcd_set_backdrop(NULL);
#endif
backlight_force_on(); /* backlight control in lib/helper.c */
#ifdef HAVE_REMOTE_LCD
remote_backlight_force_on(); /* remote backlight control in lib/helper.c */
#endif
ret = plugin_main();
return ret;
}
#endif /* #ifdef HAVE_LCD_BITMAP */
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