2013-04-14 20:36:24 +00:00
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/* Microcontroller graphic demo by Pascal Piazzalunga
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* admin@serveurperso.com http://www.serveurperso.com
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* https://www.youtube.com/watch?v=wyuJ-dqS2to
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* Ported to stm32/ChibiOS/glx by Chris Baird.
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* It's spinnin' bubbles, man.
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* --
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* Licencing? Ask Pascal. Let's assume it is freely-distributable and
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* modifiable, provided his name is kept in the source.
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* --
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* Chris Baird,, <cjb@brushtail.apana.org.au> April 2013
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2013-05-24 15:26:52 +00:00
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*
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* Modified Andrew Hannam (inmarket) 2013-04-29 New GFX calls
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2013-04-14 20:36:24 +00:00
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*/
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#include <math.h>
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#include "gfx.h"
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/* ---------------------------------------------------------------------- */
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#define N 1024 /* Number of dots */
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#define SCALE 8192
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#define INCREMENT 512 /* INCREMENT = SCALE / sqrt(N) * 2 */
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#define PI2 6.283185307179586476925286766559
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#define background RGB2COLOR(0,0,0)
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uint16_t width, height;
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int16_t sine[SCALE+(SCALE/4)];
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int16_t *cosi = &sine[SCALE/4]; /* cos(x) = sin(x+90d)... */
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void initialize (void)
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{
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uint16_t i;
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/* if you change the SCALE*1.25 back to SCALE, the program will
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* occassionally overrun the cosi array -- however this actually
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* produces some interesting effects as the BUBBLES LOSE CONTROL!!!!
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*/
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for (i = 0; i < SCALE+(SCALE/4); i++)
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//sine[i] = (-SCALE/2) + (int)(sinf(PI2 * i / SCALE) * sinf(PI2 * i / SCALE) * SCALE);
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sine[i] = (int)(sinf(PI2 * i / SCALE) * SCALE);
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}
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2018-07-08 01:19:43 +00:00
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void matrix (int16_t xyz[3][N], gColor col[N])
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2013-04-14 20:36:24 +00:00
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{
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static uint32_t t = 0;
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int16_t x = -SCALE, y = -SCALE;
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uint16_t i, s, d;
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uint8_t red,grn,blu;
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#define RED_COLORS (32)
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#define GREEN_COLORS (64)
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#define BLUE_COLORS (32)
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for (i = 0; i < N; i++)
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{
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xyz[0][i] = x;
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xyz[1][i] = y;
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2014-02-18 14:23:07 +00:00
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d = sqrt(x * x + y * y); /* originally a fastsqrt() call */
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2013-04-14 20:36:24 +00:00
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s = sine[(t * 30) % SCALE] + SCALE;
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xyz[2][i] = sine[(d + s) % SCALE] * sine[(t * 10) % SCALE] / SCALE / 2;
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red = (cosi[xyz[2][i] + SCALE / 2] + SCALE) *
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(RED_COLORS - 1) / SCALE / 2;
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grn = (cosi[(xyz[2][i] + SCALE / 2 + 2 * SCALE / 3) % SCALE] + SCALE) *
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(GREEN_COLORS - 1) / SCALE / 2;
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blu = (cosi[(xyz[2][i] + SCALE / 2 + SCALE / 3) % SCALE] + SCALE) *
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(BLUE_COLORS - 1) / SCALE / 2;
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col[i] = ((red << 11) + (grn << 5) + blu);
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x += INCREMENT;
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if (x >= SCALE) x = -SCALE, y += INCREMENT;
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}
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t++;
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}
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void rotate (int16_t xyz[3][N], uint16_t angleX, uint16_t angleY, uint16_t angleZ)
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{
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uint16_t i;
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int16_t tmpX, tmpY;
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int16_t sinx = sine[angleX], cosx = cosi[angleX];
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int16_t siny = sine[angleY], cosy = cosi[angleY];
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int16_t sinz = sine[angleZ], cosz = cosi[angleZ];
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for (i = 0; i < N; i++)
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{
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tmpX = (xyz[0][i] * cosx - xyz[2][i] * sinx) / SCALE;
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xyz[2][i] = (xyz[0][i] * sinx + xyz[2][i] * cosx) / SCALE;
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xyz[0][i] = tmpX;
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tmpY = (xyz[1][i] * cosy - xyz[2][i] * siny) / SCALE;
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xyz[2][i] = (xyz[1][i] * siny + xyz[2][i] * cosy) / SCALE;
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xyz[1][i] = tmpY;
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tmpX = (xyz[0][i] * cosz - xyz[1][i] * sinz) / SCALE;
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xyz[1][i] = (xyz[0][i] * sinz + xyz[1][i] * cosz) / SCALE;
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xyz[0][i] = tmpX;
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}
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}
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2018-07-08 01:19:43 +00:00
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void draw(int16_t xyz[3][N], gColor col[N])
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2013-04-14 20:36:24 +00:00
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{
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static uint16_t oldProjX[N] = {0};
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static uint16_t oldProjY[N] = {0};
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static uint8_t oldDotSize[N] = {0};
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uint16_t i, projX, projY, projZ, dotSize;
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for (i = 0; i < N; i++)
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{
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projZ = SCALE - (xyz[2][i] + SCALE) / 4;
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projX = width / 2 + (xyz[0][i] * projZ / SCALE) / 25;
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projY = height / 2 + (xyz[1][i] * projZ / SCALE) / 25;
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dotSize = 3 - (xyz[2][i] + SCALE) * 2 / SCALE;
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gdispDrawCircle (oldProjX[i], oldProjY[i], oldDotSize[i], background);
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if (projX > dotSize &&
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projY > dotSize &&
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projX < width - dotSize &&
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projY < height - dotSize)
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{
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gdispDrawCircle (projX, projY, dotSize, col[i]);
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oldProjX[i] = projX;
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oldProjY[i] = projY;
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oldDotSize[i] = dotSize;
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}
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}
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}
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/* ---------------------------------------------------------------------- */
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int16_t angleX = 0, angleY = 0, angleZ = 0;
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int16_t speedX = 0, speedY = 0, speedZ = 0;
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int16_t xyz[3][N];
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2018-07-08 01:19:43 +00:00
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gColor col[N];
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2013-04-14 20:36:24 +00:00
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int main (void)
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{
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int pass = 0;
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2013-05-24 15:26:52 +00:00
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gfxInit();
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2013-04-14 20:36:24 +00:00
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2014-02-18 14:23:07 +00:00
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gfxSleepMilliseconds (10);
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2013-04-14 20:36:24 +00:00
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gdispClear (background); /* glitches.. */
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2014-02-18 14:23:07 +00:00
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gfxSleepMilliseconds (10);
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2013-04-14 20:36:24 +00:00
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gdispClear (background); /* glitches.. */
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2014-02-18 14:23:07 +00:00
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gfxSleepMilliseconds (10);
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2013-04-14 20:36:24 +00:00
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gdispClear (background); /* glitches.. */
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width = (uint16_t)gdispGetWidth();
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height = (uint16_t)gdispGetHeight();
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initialize();
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for (;;)
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{
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matrix(xyz, col);
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rotate(xyz, angleX, angleY, angleZ);
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draw(xyz, col);
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angleX += speedX;
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angleY += speedY;
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angleZ += speedZ;
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if (pass > 400) speedY = 1;
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if (pass > 800) speedX = 1;
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if (pass > 1200) speedZ = 1;
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pass++;
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if (angleX >= SCALE) angleX -= SCALE;
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else if (angleX < 0) angleX += SCALE;
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if (angleY >= SCALE) angleY -= SCALE;
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else if (angleY < 0) angleY += SCALE;
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if (angleZ >= SCALE) angleZ -= SCALE;
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else if (angleZ < 0) angleZ += SCALE;
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}
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}
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/* ---------------------------------------------------------------------- */
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