add 'dunes' effect

main/CMakeLists.txt

@@ -45,6 +45,7 @@ idf_component_register(
  effects/spaceships.c
  effects/fireflies.c
  effects/tunnel.c
+ effects/dunes.c
 
  EMBED_TXTFILES
  ${EMBED}/web/jquery.js

main/effect.c

@@ -35,6 +35,7 @@
 #include "effects/spaceships.h"
 #include "effects/fireflies.h"
 #include "effects/tunnel.h"
+#include "effects/dunes.h"
 
 const effect_descriptor_t effects[] = {
  DESCR_EFFECT_LAMP,
@@ -67,6 +68,7 @@ const effect_descriptor_t effects[] = {
  DESCR_EFFECT_SPACESHIPS,
  DESCR_EFFECT_FIREFLIES,
  DESCR_EFFECT_TUNNEL,
+ DESCR_EFFECT_DUNES,
 };
 
 const size_t effects_count = sizeof(effects) / sizeof(effect_descriptor_t);

main/effects/dunes.c

@@ -0,0 +1,51 @@
+/**
+ * Colored dunes (AA lines)
+ *
+ * Author: costyn (https://wokwi.com/projects/284541784463245837)
+ */
+#include "effects/dunes.h"
+
+#include <lib8tion.h>
+#include "palettes.h"
+
+#define P_SPEED 0
+#define P_PALETTE 1
+
+EFFECT_PARAMS(dunes, 2) = {
+ DECL_PARAM(P_SPEED, "Speed", 1, 40, 5),
+ DECL_PARAM(P_PALETTE, "Palette", 0, PALETTE_MAX - 1, PALETTE_WOOD_FIRE),
+};
+
+esp_err_t effect_dunes_run(framebuffer_t *fb)
+{
+ CHECK(fb_begin(fb));
+
+ uint32_t ms = esp_timer_get_time() / 1000 * PARAM_VAL(dunes, P_SPEED) / 10;
+
+ uint32_t y_hue_delta = (int32_t)sin16(ms * 11) / 128;
+ uint32_t x_hue_delta = (int32_t)cos16(ms * 11) / 128;
+ uint32_t start_hue = ms << 8;
+ uint32_t line_start_hue = start_hue - (fb->height + 1) / 2 * y_hue_delta;
+ int16_t yd2 = sin16(ms * 3) / 32;
+ int16_t xd2 = sin16(ms * 7) / 32;
+ for (size_t y = 0; y < fb->height; y++)
+ {
+ uint32_t pixel_hue = line_start_hue - (fb->width + 1) / 2 * x_hue_delta;
+ uint32_t xhd = x_hue_delta;
+ line_start_hue += y_hue_delta;
+ y_hue_delta += yd2;
+ for (size_t x = 0; x < fb->width; x++)
+ {
+ //rgb_t c = color_from_palette_rgb(palette, palette_size, pixel_hue >> 8, 255, true);
+ rgb_t c = color_from_palette_rgb(
+ palettes[PARAM_VAL(dunes, P_PALETTE)].palette,
+ palettes[PARAM_VAL(dunes, P_PALETTE)].size,
+ pixel_hue >> 8, 255, true);
+ fb_set_pixel_rgb(fb, x, y, c);
+ pixel_hue += xhd;
+ xhd += xd2;
+ }
+ }
+
+ return fb_end(fb);
+}

main/effects/dunes.h

@@ -0,0 +1,17 @@
+/**
+ * Colored dunes (AA lines)
+ *
+ * Author: costyn (https://wokwi.com/projects/284541784463245837)
+ */
+#ifndef __EFFECTS_DUNES_H__
+#define __EFFECTS_DUNES_H__
+
+#include "effect.h"
+
+extern EFFECT_PARAMS(dunes, 2);
+
+esp_err_t effect_dunes_run(framebuffer_t *fb);
+
+#define DESCR_EFFECT_DUNES DECL_EFFECT_SHORT(dunes, "Colored dunes")
+
+#endif /* __EFFECTS_DUNES_H__ */