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760 user890104 1 
//
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//
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//    Copyright 2011 user890104
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//
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//
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//    This file is part of emCORE.
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//
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//    emCORE is free software: you can redistribute it and/or
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//    modify it under the terms of the GNU General Public License as
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//    published by the Free Software Foundation, either version 2 of the
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//    License, or (at your option) any later version.
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//
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//    emCORE is distributed in the hope that it will be useful,
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//    but WITHOUT ANY WARRANTY; without even the implied warranty of
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//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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//    See the GNU General Public License for more details.
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//
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//    You should have received a copy of the GNU General Public License along
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//    with emCORE.  If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "emcoreapp.h"
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#define BALL_W 5
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#define BALL_H 5
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unsigned int dw, dh, dbpp;
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void* fb;
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static inline void drawat(unsigned int x, unsigned int y, unsigned char color)
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{
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    if (x >= dw || y >= dh) return;
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    // TODO: is there a better way?
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    *((char *)(fb + dbpp * x + dbpp * dw * y)) = color;
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    *((char *)(fb + dbpp * x + dbpp * dw * y + 1)) = color;
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    *((char *)(fb + dbpp * x + dbpp * dw * y + 2)) = color;
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}
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static void main()
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{
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    unsigned int run_cycles = 5000;
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    dw = lcd_get_width();
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    dh = lcd_get_height();
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    dbpp = 3; // 24-bit FB (rgb888)
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    unsigned int fb_size = dbpp * dw * dh;
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    fb = malloc(fb_size);
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    if (fb == NULL)
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    {
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        panic(PANIC_KILLTHREAD, "Unable to allocate framebuffer!");
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    }
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    unsigned int i, x = 0, y = 0,
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    old_x, old_y, bx, by,
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    size = BALL_W * BALL_H;
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    int vx = 1, vy = 1;
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    //filllcd(0, 0, dw, dh, 0xffffff); // broken on Nano 4G?
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    memset(fb, 0xff, fb_size);
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    displaylcd(0, 0, dw, dh, fb, 0, 0, dw);
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    while (run_cycles > 0)
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    {
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        memset(fb, 0xff, fb_size);
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        // check if we hit a wall
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        if ((x >= dw - BALL_W && vx > 0) || (x == 0 && vx < 0))
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        {
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            vx = -vx;
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        }
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        if ((y >= dh - BALL_H && vy > 0) || (y == 0 && vy < 1))
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        {
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            vy = -vy;
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        }
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        // store old x and y
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        // needed for redrawing later
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        old_x = x; old_y = y;
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        x += vx; y += vy;
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        // draw our ball-like object
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        // a circle-like actually, since we
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        // don't have a 3D engine yet :)
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        for (i = 1; i < BALL_W - 1; ++i)
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        {
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            drawat(x + i, y, 0);
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        }
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        for (i = BALL_W; i < size - BALL_W; ++i)
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        {
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            drawat(x + i % BALL_W, y + i / BALL_W, 0);
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        }
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        for (i = 1; i < BALL_W - 1; ++i)
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        {
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            drawat(x + i, y + BALL_H - 1, 0);
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        }
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        // offset to redraw from
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        bx = vx > 0 ? old_x : x;
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        by = vy > 0 ? old_y : y;
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        displaylcd(bx, by, BALL_W + ABS(vx), BALL_H + ABS(vy), fb, bx, by, dw);
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        sleep(1000);
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        --run_cycles;
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    }
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    free(fb);
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    cputs(3, "Application terminated\n");
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}
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EMCORE_APP_HEADER("Ball", main, 127)