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#include "drawing.h"
#include "sprites.h"
#include "maxCommands.h"
/* Draw sprite to screen
*
* layer: 16x8 bit buffer
* x, y: Position on screen
* sprite: Sprite to draw
*/
void drawSprite(uint8_t layer[], uint8_t x, uint8_t y, struct Sprite* sprite) {
/* Check if in range */
if( x + sprite->width > 8 || y + sprite->height > 16)
return;
/* Or buffer with sprite */
for (int i = y; i < sprite->height + y; i++) {
layer[i] |= sprite->buff[i - y] >> x;
}
}
/* Clear specified buffer */
void clearBuffer(uint8_t layer[] ) {
for( int i = 0; i < BUFF_HEIGHT; i++ ) {
layer[i] = 0;
}
}
/* Render specfied screenbuffer
*
* device: Which screen
* where: It render the next 8 bytes from this index
*/
void render(int device, uint8_t screenBuffer[], unsigned int where) {
static uint8_t onScreen[BUFF_HEIGHT];
static unsigned long reRenderLast;
int i;
uint8_t toWrite;
/* Completely rerender every one second */
bool reRender = (millis() - reRenderLast ) > REDRAW_TIME;
/* Will draw 8 lines from /where/. */
for(i = where; i < (where + 8); i++) {
toWrite = screenbuffer[i];
/* Check if whats on screen is the same */
if(onScreen[i] == toWrite && !reRender)
continue;
writeCommand(device, maxDIGIT_0 + i - where, toWrite);
/* Keep track of whats on screen */
onScreen[i] = toWrite;
}
if(reRender)
reRenderLast = millis();
}
/* Write a register to specified display */
static void writeCommand(int display, uint8_t addr, uint8_t data) {
/* Chip select low */
digitalWrite(CS, LOW);
/* Shift out the data, to the max shift registers
* MSBFIRST makes the MSB go first out */
shiftOut(DATA_IN, CLK, MSBFIRST, addr);
shiftOut(DATA_IN, CLK, MSBFIRST, data);
/* If the device is number two, the commands should be shiftet through
* Each MAX, holds 16 bits(2 bytes) */
serialPad(curDisplay * 2);
digitalWrite(CS, HIGH);
/* Before writing new commands, all the buffers should be cleaned */
serialPad(NUM_DISPLAY * 2);
}
/* Init specified display */
void initDisplays(int display) {
}
/* Send x amount of empty bytes, recursively(for fun)*/
static void serialPad(int count) {
shiftOut(DATA_IN, CLK, MSBFIRST, 0);
if ( count )
serialPad(count-1);
}
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