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rockbox/apps/plugins/plasma.c
Daniel Stenberg 2acc0ac542 Updated our source code header to explicitly mention that we are GPL v2 or 
later. We still need to hunt down snippets used that are not. 1324 modified
files...
http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
2008-06-28 18:10:04 +00:00

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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 "helper.h"
#ifdef HAVE_LCD_BITMAP
#ifndef HAVE_LCD_COLOR
#include "grey.h"
#endif
#include "fixedpoint.h"
PLUGIN_HEADER
/******************************* Globals ***********************************/
static const struct plugin_api* rb; /* global api struct pointer */
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;
/* Key assignement, all bitmapped models */
#if (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \
(CONFIG_KEYPAD == IPOD_1G2G_PAD)
#define PLASMA_QUIT BUTTON_MENU
#define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_FWD
#define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_BACK
#elif (CONFIG_KEYPAD == GIGABEAT_PAD)
#define PLASMA_QUIT BUTTON_A
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
(CONFIG_KEYPAD == SANSA_C200_PAD)
#define PLASMA_QUIT BUTTON_POWER
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#elif (CONFIG_KEYPAD == IAUDIO_X5M5_PAD)
#define PLASMA_QUIT BUTTON_POWER
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#elif (CONFIG_KEYPAD == IRIVER_H10_PAD)
#define PLASMA_QUIT BUTTON_POWER
#define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_DOWN
#elif (CONFIG_KEYPAD == GIGABEAT_S_PAD)
#define PLASMA_QUIT BUTTON_BACK
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#elif (CONFIG_KEYPAD == MROBE100_PAD)
#define PLASMA_QUIT BUTTON_POWER
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#elif (CONFIG_KEYPAD == IAUDIO_M3_PAD)
#define PLASMA_QUIT BUTTON_RC_REC
#define PLASMA_INCREASE_FREQUENCY BUTTON_RC_VOL_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_RC_VOL_DOWN
#define PLASMA_RC_QUIT BUTTON_REC
#elif (CONFIG_KEYPAD == COWOND2_PAD)
#define PLASMA_QUIT BUTTON_POWER
#endif
#ifdef HAVE_TOUCHPAD
#ifndef PLASMA_QUIT
#define PLASMA_QUIT BUTTON_TOPLEFT
#endif
#ifndef PLASMA_INCREASE_FREQUENCY
#define PLASMA_INCREASE_FREQUENCY BUTTON_MIDRIGHT
#endif
#ifndef PLASMA_DECREASE_FREQUENCY
#define PLASMA_DECREASE_FREQUENCY BUTTON_MIDLEFT
#endif
#endif /* HAVE_TOUCHPAD */
#ifndef PLASMA_QUIT
#define PLASMA_QUIT BUTTON_OFF
#endif
#ifndef PLASMA_INCREASE_FREQUENCY
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#endif
#ifndef PLASMA_DECREASE_FREQUENCY
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#endif
#if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
#define PLASMA_RC_QUIT BUTTON_RC_STOP
#endif
#ifdef HAVE_LCD_COLOR
#if CONFIG_KEYPAD == IAUDIO_X5M5_PAD
#define PLASMA_REGEN_COLORS BUTTON_PLAY
#elif CONFIG_KEYPAD == IRIVER_H10_PAD
#define PLASMA_REGEN_COLORS BUTTON_PLAY
#elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
(CONFIG_KEYPAD == SANSA_C200_PAD)
#define PLASMA_REGEN_COLORS BUTTON_SELECT
#elif CONFIG_KEYPAD == IPOD_4G_PAD
#define PLASMA_REGEN_COLORS BUTTON_SELECT
#elif CONFIG_KEYPAD == IRIVER_H300_PAD
#define PLASMA_REGEN_COLORS BUTTON_SELECT
#elif CONFIG_KEYPAD == GIGABEAT_PAD
#define PLASMA_REGEN_COLORS BUTTON_SELECT
#elif CONFIG_KEYPAD == GIGABEAT_S_PAD
#define PLASMA_REGEN_COLORS BUTTON_SELECT
#endif
#ifdef HAVE_TOUCHPAD
#ifndef PLASMA_REGEN_COLORS
#define PLASMA_REGEN_COLORS BUTTON_CENTER
#endif
#endif /* HAVE_TOUCHPAD */
#endif /* HAVE_LCD_COLOR */
#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
* (sin_int((i * 360 * plasma_frequency) / 256))) / 16384);
}
}
#ifdef HAVE_LCD_COLOR
/* Make a smooth colour cycle. */
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] = LCD_RGBPACK(red, green, blue);
r++; g++; b++;
}
}
#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
void cleanup(void *parameter)
{
(void)parameter;
#ifndef HAVE_LCD_COLOR
grey_release();
#endif
/* Turn on backlight timeout (revert to settings) */
backlight_use_settings(rb); /* backlight control in lib/helper.c */
}
/*
* Main function that also contain the main plasma
* algorithm.
*/
int main(void)
{
plasma_frequency = 1;
int button, x, y;
unsigned char p1,p2,p3,p4,t1,t2,t3,t4, z;
#ifdef HAVE_LCD_COLOR
fb_data *ptr;
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);
grey_init(rb, gbuf, gbuf_size, GREY_ON_COP, LCD_WIDTH, LCD_HEIGHT, NULL);
/* switch on greyscale overlay */
grey_show(true);
#endif
sp1 = 4;
sp2 = 2;
sp3 = 4;
sp4 = 2;
p1=p2=p3=p4=0;
while (true)
{
#ifdef HAVE_LCD_COLOR
shades_generate(time++); /* dynamically */
ptr = rb->lcd_framebuffer;
#else
ptr = greybuffer;
#endif
t1=p1;
t2=p2;
for(y = 0; y < LCD_HEIGHT; ++y)
{
t3=p3;
t4=p4;
for(x = 0; x < LCD_WIDTH; ++x)
{
z = wave_array[t1] + wave_array[t2] + wave_array[t3]
+ wave_array[t4];
*ptr++ = colours[z];
t3+=1;
t4+=2;
}
t1+=2;
t2+=1;
rb->yield();
}
p1+=sp1;
p2-=sp2;
p3+=sp3;
p4-=sp4;
#ifdef HAVE_LCD_COLOR
rb->lcd_update();
#else
grey_ub_gray_bitmap(greybuffer, 0, 0, LCD_WIDTH, LCD_HEIGHT);
#endif
button = rb->button_get(false);
switch(button)
{
#ifdef PLASMA_RC_QUIT
case PLASMA_RC_QUIT:
#endif
case(PLASMA_QUIT):
cleanup(NULL);
return PLUGIN_OK;
break;
case (PLASMA_INCREASE_FREQUENCY):
++plasma_frequency;
wave_table_generate();
break;
case (PLASMA_DECREASE_FREQUENCY):
if(plasma_frequency>1)
{
--plasma_frequency;
wave_table_generate();
}
break;
#ifdef HAVE_LCD_COLOR
case (PLASMA_REGEN_COLORS):
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:
if (rb->default_event_handler_ex(button, cleanup, NULL)
== SYS_USB_CONNECTED)
return PLUGIN_USB_CONNECTED;
break;
}
}
}
/*************************** Plugin entry point ****************************/
enum plugin_status plugin_start(const struct plugin_api* api, const void* parameter)
{
int ret;
rb = api; /* copy to global api pointer */
(void)parameter;
#if LCD_DEPTH > 1
rb->lcd_set_backdrop(NULL);
#endif
/* Turn off backlight timeout */
backlight_force_on(rb); /* backlight control in lib/helper.c */
ret = main();
return ret;
}
#endif /* HAVE_LCD_BITMAP */
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