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rockbox/apps/plugins/plasma.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Plasma demo plugin
*
* My crack at making a 80's style retro plasma effect for the fantastic
* rockbox!
* Okay, I could've hard-coded the sine wave values, I just wanted the
* challange of calculating them! silly: maybe, fun: yes!
*
* 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"
#include "fixedpoint.h"
#include "lib/helper.h"
#include "lib/pluginlib_actions.h"
#include "lib/pluginlib_exit.h"
#ifndef HAVE_LCD_COLOR
#include "lib/grey.h"
#endif
/******************************* Globals ***********************************/
static fb_data *lcd_fb;
static unsigned char wave_array[256]; /* Pre calculated wave array */
#ifdef HAVE_LCD_COLOR
static fb_data colours[256]; /* Smooth transition of shades */
static int redfactor = 1, greenfactor = 2, bluefactor = 3;
static int redphase = 0, greenphase = 50, bluephase = 100;
/* lower chance of gray at regular intervals */
#else
GREY_INFO_STRUCT
static unsigned char colours[256]; /* Smooth transition of shades */
static unsigned char greybuffer[LCD_HEIGHT*LCD_WIDTH]; /* off screen buffer */
static unsigned char *gbuf;
static size_t gbuf_size = 0;
#endif
static unsigned char sp1, sp2, sp3, sp4; /* Speed of plasma */
static int plasma_frequency;
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
static bool boosted = false;
#endif
static const struct button_mapping* plugin_contexts[]= {
pla_main_ctx,
#if defined(HAVE_REMOTE_LCD)
pla_remote_ctx,
#endif
};
#define WAV_AMP 90
/*
* Main wave function so we don't have to re-calc the sine
* curve every time. Mess around WAV_AMP and FREQ to make slighlty
* weirder looking plasmas!
*/
static void wave_table_generate(void)
{
int i;
for (i=0;i<256;++i)
{
wave_array[i] = (unsigned char)((WAV_AMP
* (fp14_sin((i * 360 * plasma_frequency) / 256))) / 16384);
}
}
#ifdef HAVE_LCD_COLOR
/* Make a smooth colour cycle. */
static void shades_generate(int time)
{
int i;
unsigned red, green, blue;
unsigned r = time * redfactor + redphase;
unsigned g = time * greenfactor + greenphase;
unsigned b = time * bluefactor + bluephase;
for(i=0; i < 256; ++i)
{
r &= 0xFF; g &= 0xFF; b &= 0xFF;
red = 2 * r;
if (red > 255)
red = 510 - red;
green = 2 * g;
if (green > 255)
green = 510 - green;
blue = 2 * b;
if (blue > 255)
blue= 510 - blue;
colours[i] = FB_RGBPACK(red, green, blue);
r++; g++; b++;
}
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
rb->lcd_pal256_update_pal(colours);
#endif
}
#else
/* Make a smooth shade from black into white and back into black again. */
static void shades_generate(void)
{
int i, y;
for(i=0; i < 256; ++i)
{
y = 2 * i;
if (y > 255)
y = 510 - y;
colours[i] = y;
}
}
#endif
static void cleanup(void)
{
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
if (boosted)
rb->cpu_boost(false);
#endif
#ifndef HAVE_LCD_COLOR
grey_release();
#endif
#ifdef HAVE_BACKLIGHT
/* Turn on backlight timeout (revert to settings) */
backlight_use_settings();
#endif
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
rb->lcd_set_mode(LCD_MODE_RGB565);
#endif
}
/*
* Main function that also contain the main plasma
* algorithm.
*/
int main(void)
{
plasma_frequency = 1;
int action, x, y;
unsigned char p1,p2,p3,p4,t1,t2,t3,t4, z,z0;
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
long last_tick = *rb->current_tick;
int delay;
int cumulated_lag = 0;
#endif
#ifdef HAVE_LCD_COLOR
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
unsigned char *ptr;
#else
fb_data *ptr;
#endif
int time=0;
#else
unsigned char *ptr;
#endif
/*Generate the neccesary pre calced stuff*/
wave_table_generate();
#ifndef HAVE_LCD_COLOR
shades_generate(); /* statically */
/* get the remainder of the plugin buffer */
gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
if (!grey_init(gbuf, gbuf_size, GREY_ON_COP, LCD_WIDTH, LCD_HEIGHT, NULL))
{
rb->splash(HZ, "Couldn't init greyscale display");
return PLUGIN_ERROR;
}
/* switch on greyscale overlay */
grey_show(true);
#endif
atexit(cleanup);
sp1 = 4;
sp2 = 2;
sp3 = 4;
sp4 = 2;
p1=p2=p3=p4=0;
while (true)
{
#ifdef HAVE_LCD_COLOR
shades_generate(time++); /* dynamically */
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
ptr = (unsigned char*)lcd_fb;
#else
ptr = lcd_fb;
#endif
#else
ptr = greybuffer;
#endif
t1=p1;
t2=p2;
for(y = 0; y < LCD_HEIGHT; ++y)
{
t3=p3;
t4=p4;
z0 = wave_array[t1] + wave_array[t2];
for(x = 0; x < LCD_WIDTH; ++x)
{
z = z0 + wave_array[t3] + wave_array[t4];
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
*ptr++ = z;
#else
*ptr++ = colours[z];
#endif
t3+=1;
t4+=2;
}
t1+=2;
t2+=1;
rb->yield();
}
p1+=sp1;
p2-=sp2;
p3+=sp3;
p4-=sp4;
#ifdef HAVE_LCD_COLOR
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
rb->lcd_blit_pal256( (unsigned char*)lcd_fb,
0,0,0,0,LCD_WIDTH,LCD_HEIGHT);
#else
rb->lcd_update();
#endif
#else
grey_ub_gray_bitmap(greybuffer, 0, 0, LCD_WIDTH, LCD_HEIGHT);
#endif
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
delay = last_tick - *rb->current_tick + HZ/33;
if (!boosted && delay < 0)
{
cumulated_lag -= delay; /* proportional increase */
if (cumulated_lag >= HZ)
rb->cpu_boost(boosted = true);
}
else if (boosted && delay > 1) /* account for jitter */
{
if (--cumulated_lag <= 0) /* slow decrease */
rb->cpu_boost(boosted = false);
}
last_tick = *rb->current_tick;
#endif
action = pluginlib_getaction(0, plugin_contexts,
ARRAYLEN(plugin_contexts));
switch(action)
{
case PLA_EXIT:
case PLA_CANCEL:
return PLUGIN_OK;
break;
#ifdef HAVE_SCROLLWHEEL
case PLA_SCROLL_FWD:
case PLA_SCROLL_FWD_REPEAT:
#endif
case PLA_UP:
case PLA_UP_REPEAT:
++plasma_frequency;
wave_table_generate();
break;
#ifdef HAVE_SCROLLWHEEL
case PLA_SCROLL_BACK:
case PLA_SCROLL_BACK_REPEAT:
#endif
case PLA_DOWN:
case PLA_DOWN_REPEAT:
if(plasma_frequency>1)
{
--plasma_frequency;
wave_table_generate();
}
break;
#ifdef HAVE_LCD_COLOR
case PLA_SELECT:
redfactor=rb->rand()%4;
greenfactor=rb->rand()%4;
bluefactor=rb->rand()%4;
redphase=rb->rand()%256;
greenphase=rb->rand()%256;
bluephase=rb->rand()%256;
break;
#endif
default:
exit_on_usb(action);
break;
}
}
}
/*************************** Plugin entry point ****************************/
enum plugin_status plugin_start(const void* parameter)
{
(void)parameter;
#if LCD_DEPTH > 1
rb->lcd_set_backdrop(NULL);
#endif
#ifdef HAVE_BACKLIGHT
/* Turn off backlight timeout */
backlight_ignore_timeout();
#endif
#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
rb->lcd_set_mode(LCD_MODE_PAL256);
#endif
struct viewport *vp_main = rb->lcd_set_viewport(NULL);
lcd_fb = vp_main->buffer->fb_ptr;
return main();
}
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