out_esp8266_ws2812b: Add esp-open-rtos based ws2812b output.

src/modules/out_esp8266_ws2812b.c

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+// ESP8266 i2s-based ws2812b output.
+// Stolen from https://github.com/SuperHouse/esp-open-rtos/blob/master/examples/ws2812_i2s/ws2812_i2s_colour_loop.c
+
+// Matrix order and size
+#if !defined(MATRIX_ORDER_PLAIN) && !defined(MATRIX_ORDER_SNAKE)
+#define MATRIX_ORDER_SNAKE // cause that's what i have, it's also the easiest to wire, IMO.
+#endif
+
+#ifndef MATRIX_X
+#error Define MATRIX_X as the matrixes X size.
+#endif
+
+#ifndef MATRIX_Y
+#error Define MATRIX_Y as the matrixes Y size.
+#endif
+
+#define MATRIX_PIXELS (MATRIX_X * MATRIX_Y)
+
+#include <types.h>
+#include <timers.h>
+#include <matrix.h>
+#include "espressif/esp_common.h"
+#include "FreeRTOS.h"
+#include "task.h"
+#include "esp/uart.h"
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "ws2812_i2s/ws2812_i2s.h"
+
+ws2812_pixel_t pixels[MATRIX_PIXELS];
+
+int init(void) {
+	ws2812_i2s_init(MATRIX_PIXELS, PIXEL_RGB);
+	memset(pixels, 0, sizeof(ws2812_pixel_t) * MATRIX_PIXELS);
+
+	return 0;
+}
+
+
+int getx(void) {
+	return MATRIX_X;
+}
+int gety(void) {
+	return MATRIX_Y;
+}
+
+int ppos(int x, int y) {
+#ifdef MATRIX_ORDER_PLAIN
+	return (x + (y * MATRIX_X));
+#elif defined(MATRIX_ORDER_SNAKE)
+	// Order is like this
+	// 0 1 2
+	// 5 4 3
+	// 6 7 8
+	return (((y % 2) == 0 ? x : (MATRIX_X - 1) - x) + MATRIX_X*y);
+#endif
+}
+
+int set(int x, int y, RGB *color) {
+	// No OOB check, because performance.
+	ws2812_pixel_t* px = pixels[ppos(x, y)];
+	px->red = color->red;
+	px->green = color->green;
+	px->blue = color->blue;
+	return 0;
+}
+
+
+int clear(void) {
+	memset(pixels, 0, sizeof(ws2812_pixel_t) * led_number);
+	return 0;
+}
+
+int render(void) {
+	ws2812_i2s_update(pixels, PIXEL_RGB);
+	return 0;
+}
+
+ulong wait_until(ulong desired_usec) {
+	return wait_until_core(desired_usec);
+}
+
+void wait_until_break(void) {
+	return wait_until_break_core();
+}
+
+int deinit(void) {
+	// No deinit method? Fine by me.
+	return 0;
+}