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rockbox/apps/plugins/fire.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Kevin Ferrare
*
* Fire demo plugin
*
* 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.
*
****************************************************************************/
#ifndef SIMULATOR /* not for simulator (grayscale) */
#include "plugin.h"
#ifdef HAVE_LCD_BITMAP /* and also not for the Player */
#include "gray.h"
PLUGIN_HEADER
/******************************* Globals ***********************************/
static struct plugin_api* rb; /* global api struct pointer */
static unsigned char *gbuf;
static unsigned int gbuf_size = 0;
static unsigned char fire[LCD_HEIGHT+3][LCD_WIDTH];
static unsigned char cooling_map[LCD_HEIGHT][LCD_WIDTH];
static unsigned char draw_buffer[8*LCD_WIDTH];
/* Key assignement */
#define FIRE_QUIT BUTTON_OFF
#define FIRE_INCREASE_MULT BUTTON_UP
#define FIRE_DECREASE_MULT BUTTON_DOWN
#if CONFIG_KEYPAD == IRIVER_H100_PAD
#define FIRE_SWITCH_FLAMES_TYPE BUTTON_MODE
#define FIRE_SWITCH_FLAMES_MOVING BUTTON_REC
#elif CONFIG_KEYPAD == RECORDER_PAD
#define FIRE_SWITCH_FLAMES_TYPE BUTTON_ON
#define FIRE_SWITCH_FLAMES_MOVING BUTTON_PLAY
#elif CONFIG_KEYPAD == ONDIO_PAD
#define FIRE_SWITCH_FLAMES_TYPE BUTTON_MENU
#define FIRE_SWITCH_FLAMES_MOVING BUTTON_RIGHT
#endif
#define MIN_FLAME_VALUE 0
#if LCD_HEIGHT > 64
#define COOL_MAX 5
#else
#define COOL_MAX 8
#endif
/* unsigned 16 bit multiplication (a single instruction on the SH) */
#define MULU16(a, b) ((unsigned long) \
(((unsigned short) (a)) * ((unsigned short) (b))))
static unsigned char palette[255]=
{/* logarithmic histogram equalisation */
0, 15, 31, 50, 63, 74, 82, 89, 95, 101, 105, 110, 114, 118, 121,
124, 127, 130, 133, 135, 137, 140, 142, 144, 146, 148, 149, 151, 153, 154,
156, 158, 159, 160, 162, 163, 164, 166, 167, 168, 169, 170, 172, 173, 174,
175, 176, 177, 178, 179, 180, 180, 181, 182, 183, 184, 185, 186, 186, 187,
188, 189, 189, 190, 191, 192, 192, 193, 194, 194, 195, 196, 196, 197, 198,
198, 199, 199, 200, 201, 201, 202, 202, 203, 203, 204, 204, 205, 206, 206,
207, 207, 208, 208, 209, 209, 210, 210, 210, 211, 211, 212, 212, 213, 213,
214, 214, 215, 215, 215, 216, 216, 217, 217, 217, 218, 218, 219, 219, 219,
220, 220, 221, 221, 221, 222, 222, 222, 223, 223, 223, 224, 224, 225, 225,
225, 226, 226, 226, 227, 227, 227, 228, 228, 228, 229, 229, 229, 229, 230,
230, 230, 231, 231, 231, 232, 232, 232, 232, 233, 233, 233, 234, 234, 234,
234, 235, 235, 235, 236, 236, 236, 236, 237, 237, 237, 237, 238, 238, 238,
238, 239, 239, 239, 239, 240, 240, 240, 240, 241, 241, 241, 241, 242, 242,
242, 242, 243, 243, 243, 243, 244, 244, 244, 244, 244, 245, 245, 245, 245,
246, 246, 246, 246, 246, 247, 247, 247, 247, 247, 248, 248, 248, 248, 249,
249, 249, 249, 249, 250, 250, 250, 250, 250, 251, 251, 251, 251, 251, 252,
252, 252, 252, 252, 252, 253, 253, 253, 253, 253, 254, 254, 254, 254, 254
};
static inline void tab_init_rand(unsigned char *tab, unsigned int tab_size,
int rand_max)
{
unsigned char *end = tab + tab_size;
while(tab < end)
*tab++ = (unsigned char)rb->rand() % rand_max;
}
static inline void fire_generate(int mult, int flames_type, bool moving)
{
unsigned int pixel_value = 0; /* stop the compiler complaining */
unsigned int cooling_value;
unsigned char *ptr, *end, *cool;
/* Randomize the bottom line */
if(moving)
{/* moving must be true the first time the function is called */
ptr = &fire[LCD_HEIGHT][0];
end = ptr + LCD_WIDTH;
do
{
*ptr++ = (MIN_FLAME_VALUE + rb->rand() % (256-MIN_FLAME_VALUE));
}
while (ptr < end);
}
rb->yield();
/* Convolve the pixels and handle cooling (to add nice shapes effects later) */
cool = &cooling_map[0][0];
ptr = &fire[0][0];
end = ptr + LCD_HEIGHT*LCD_WIDTH;
switch (flames_type)
{
case 0:
do
{
pixel_value = ptr[LCD_WIDTH-1] /* fire[y+1][x-1] */
+ ptr[2*LCD_WIDTH] /* fire[y+2][x] */
+ ptr[LCD_WIDTH+1] /* fire[y+1][x+1] */
+ ptr[3*LCD_WIDTH]; /* fire[y+3][x] */
pixel_value = MULU16(pixel_value, mult) >> 10;
cooling_value = *cool++;
if (cooling_value <= pixel_value)
pixel_value -= cooling_value;
/* else it's too cold, don't frost the pixels !!! */
if (pixel_value > 255)
pixel_value = 255;
*ptr++ = pixel_value;
}
while (ptr < end);
break;
case 1:
do
{
pixel_value = ptr[LCD_WIDTH-1] /* fire[y+1][x-1] */
+ ptr[LCD_WIDTH] /* fire[y+1][x] */
+ ptr[LCD_WIDTH+1] /* fire[y+1][x+1] */
+ ptr[2*LCD_WIDTH]; /* fire[y+2][x] */
pixel_value = MULU16(pixel_value, mult) >> 10;
cooling_value = *cool++;
if (cooling_value <= pixel_value)
pixel_value -= cooling_value;
/* else it's too cold, don't frost the pixels !!! */
if (pixel_value > 255)
pixel_value = 255;
*ptr++ = pixel_value;
}
while (ptr < end);
break;
default: /* We should never reach this */
break;
}
rb->yield();
}
static inline void fire_draw(void)
{
int block;
unsigned char *dest, *end;
unsigned char *src = &fire[0][0];
for (block = 0; block < LCD_HEIGHT; block += 8)
{
dest = draw_buffer;
end = dest + 8*LCD_WIDTH;
do
*dest++ = palette[*src++];
while(dest < end);
gray_ub_gray_bitmap(draw_buffer, 0, block, LCD_WIDTH, 8);
}
}
void cleanup(void *parameter)
{
(void)parameter;
#if !defined(SIMULATOR) && defined(HAVE_ADJUSTABLE_CPU_FREQ)
rb->cpu_boost(false);
#endif
gray_release();
rb->backlight_set_timeout(rb->global_settings->backlight_timeout);
}
/*
* Main function that also contain the main plasma
* algorithm.
*/
int main(void)
{
int shades, button;
int mult = 261;
int flames_type=0;
bool moving=true;
/* get the remainder of the plugin buffer */
gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
shades = gray_init(rb, gbuf, gbuf_size, false, LCD_WIDTH, LCD_HEIGHT/8,
32, NULL) + 1;
if(shades <= 1)
{
rb->splash(HZ, true, "not enougth memory");
return PLUGIN_ERROR;
}
#if !defined(SIMULATOR) && defined(HAVE_ADJUSTABLE_CPU_FREQ)
rb->cpu_boost(true);
#endif
/* switch on grayscale overlay */
gray_show(true);
rb->memset(&fire[0][0], 0, sizeof(fire));
tab_init_rand(&cooling_map[0][0], LCD_HEIGHT*LCD_WIDTH, COOL_MAX);
while (true)
{
fire_generate(mult, flames_type, moving);
fire_draw();
rb->yield();
button = rb->button_get(false);
switch(button)
{
case(FIRE_QUIT):
cleanup(NULL);
return PLUGIN_OK;
break;
case (FIRE_INCREASE_MULT):
++mult;
break;
case (FIRE_DECREASE_MULT):
if (mult > 0)
--mult;
break;
case (FIRE_SWITCH_FLAMES_TYPE):
flames_type = (flames_type + 1) % 2;
break;
case (FIRE_SWITCH_FLAMES_MOVING):
moving = !moving;
break;
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 // #ifdef HAVE_LCD_BITMAP
#endif // #ifndef SIMULATOR
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