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rockbox/apps/plugins/plasma.c
Jens Arnold 628d20a610 Grayscale library: LCD linearisation and gamma correction. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10402 a1c6a512-1295-4272-9138-f99709370657
2006-08-02 00:22:01 +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!
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* 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
#ifndef HAVE_LCD_COLOR
#include "gray.h"
#endif
PLUGIN_HEADER
/******************************* Globals ***********************************/
static 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
static unsigned char colours[256]; /* Smooth transition of shades */
static unsigned char graybuffer[LCD_HEIGHT*LCD_WIDTH]; /* off screen buffer */
static unsigned char *gbuf;
static unsigned int 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_3G_PAD) || (CONFIG_KEYPAD == IPOD_4G_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 == IAUDIO_X5_PAD)
#define PLASMA_QUIT BUTTON_POWER
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#else
#define PLASMA_QUIT BUTTON_OFF
#define PLASMA_INCREASE_FREQUENCY BUTTON_UP
#define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
#if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
#define PLASMA_RC_QUIT BUTTON_RC_STOP
#endif
#endif
#ifdef HAVE_LCD_COLOR
#if CONFIG_KEYPAD == IAUDIO_X5_PAD
#define PLASMA_REGEN_COLORS BUTTON_PLAY
#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
#endif
#endif
#define WAV_AMP 90
/* Precalculated sine * 16384 (fixed point 18.14) */
static const short sin_table[91] =
{
0, 285, 571, 857, 1142, 1427, 1712, 1996, 2280, 2563,
2845, 3126, 3406, 3685, 3963, 4240, 4516, 4790, 5062, 5334,
5603, 5871, 6137, 6401, 6663, 6924, 7182, 7438, 7691, 7943,
8191, 8438, 8682, 8923, 9161, 9397, 9630, 9860, 10086, 10310,
10531, 10748, 10963, 11173, 11381, 11585, 11785, 11982, 12175, 12365,
12550, 12732, 12910, 13084, 13254, 13420, 13582, 13740, 13894, 14043,
14188, 14329, 14466, 14598, 14725, 14848, 14967, 15081, 15190, 15295,
15395, 15491, 15582, 15668, 15749, 15825, 15897, 15964, 16025, 16082,
16135, 16182, 16224, 16261, 16294, 16321, 16344, 16361, 16374, 16381,
16384
};
static short sin(int val)
{
/* value should be between 0 and 360 degree for correct lookup*/
val%=360;
if(val<0)
val+=360;
/* Speed improvement through successive lookup */
if (val < 181)
{
if (val < 91)
{
/* phase 0-90 degree */
return (short)sin_table[val];
}
else
{
/* phase 91-180 degree */
return (short)sin_table[180-val];
}
}
else
{
if (val < 271)
{
/* phase 181-270 degree */
return -(short)sin_table[val-180];
}
else
{
/* phase 270-359 degree */
return -(short)sin_table[360-val];
}
}
return 0;
}
/*
* 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((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
gray_release();
#endif
rb->backlight_set_timeout(rb->global_settings->backlight_timeout);
}
/*
* 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);
gray_init(rb, gbuf, gbuf_size, false, LCD_WIDTH, LCD_HEIGHT/8, 32, 2<<8, NULL);
/* switch on grayscale overlay */
gray_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 = graybuffer;
#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
gray_ub_gray_bitmap(graybuffer, 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(struct plugin_api* api, void* parameter)
{
int ret;
rb = api; /* copy to global api pointer */
(void)parameter;
if (rb->global_settings->backlight_timeout > 0)
rb->backlight_set_timeout(1);/* keep the light on */
ret = main();
return ret;
}
#endif /* HAVE_LCD_BITMAP */
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