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