99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
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#include "../config.h"
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#include <stdint.h>
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#include "../random/prng.h"
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#include "../pixel.h"
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#include "../util.h"
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typedef struct{
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pixel start;
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unsigned char len;
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unsigned char decay;
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unsigned char index;
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unsigned char speed;
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} streamer;
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typedef uint8_t pixel_matrix_t[NUM_COLS][NUM_ROWS/4];
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inline static uint8_t get_bright(pixel_matrix_t *matrix, uint8_t x, uint8_t y){
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uint8_t ret;
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ret = (*matrix)[x][y/4];
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return 0x3&(ret>>(2*(y%4)));
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}
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inline static void set_bright(pixel_matrix_t *matrix, uint8_t x, uint8_t y, uint8_t value){
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uint8_t t;
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t = (*matrix)[x][y/4];
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t &= ~(0x3<<(2*(y%4)));
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t |= value<<(2*(y%4));
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(*matrix)[x][y/4] = t;
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}
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void matrix() {
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unsigned int counter = 500; /* run 500 cycles */
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streamer streamers[STREAMER_NUM];
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pixel_matrix_t matrix_bright;
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unsigned char x, y;
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unsigned char index = 0;
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unsigned char draw;
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unsigned char streamer_num = 0;
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while(counter--){
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unsigned char i, j;
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/* initialise matrix-buffer */
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for(x=0;x<NUM_COLS;x++)
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for(y=0;y<NUM_ROWS/4;y++)
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matrix_bright[x][y]=0;
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for(i=0;i<streamer_num;i++){
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streamer str = streamers[i];
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unsigned char bright = 0xFF; draw = 0;
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for(j=(str.len/8);j!=0xFF;j--){ /* Draw streamer */
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if(j+str.start.y<NUM_ROWS){
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if(bright>>6) /* bright>>6 */
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draw = 1;
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if(bright > (get_bright(&matrix_bright, str.start.x, str.start.y+j)<<6) ){
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set_bright(&matrix_bright, str.start.x, str.start.y+j, bright>>6);
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}
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}
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bright-=((bright>>5)*str.decay);
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}
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str.len+=str.speed/2;
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streamers[i] = str;
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if(!draw){
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for(j=i;j<streamer_num-1;j++){
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streamers[j] = streamers[j+1];
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}
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streamer_num--;
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i--;
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}
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}
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for(y=0;y<NUM_ROWS;y++)
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for(x=0;x<NUM_COLS;x++){
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setpixel((pixel){x,y}, get_bright(&matrix_bright,x,y));
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}
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unsigned char nsc;
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for(nsc=0;nsc<6;nsc++){
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if(streamer_num<STREAMER_NUM){
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unsigned char sy = random8()%(2*NUM_ROWS);
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if (sy>NUM_ROWS-1) sy=0;
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streamers[streamer_num] = (streamer){{random8()%NUM_COLS, sy}, 0, (random8()%8)+12, index++,(random8()%16)+3};
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streamer_num++;
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}
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}
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wait(60);
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}
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}
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