[display] SDL2 display driver for host platform (#6825)

esphome/components/sdl/touchscreen/__init__.py

@@ -0,0 +1,22 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.const import CONF_ID
+
+from esphome.components import touchscreen
+from ..display import Sdl, sdl_ns, CONF_SDL_ID
+
+SdlTouchscreen = sdl_ns.class_("SdlTouchscreen", touchscreen.Touchscreen)
+
+
+CONFIG_SCHEMA = touchscreen.TOUCHSCREEN_SCHEMA.extend(
+    {
+        cv.GenerateID(): cv.declare_id(SdlTouchscreen),
+        cv.GenerateID(CONF_SDL_ID): cv.use_id(Sdl),
+    }
+)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_parented(var, config[CONF_SDL_ID])
+    await touchscreen.register_touchscreen(var, config)

esphome/components/sdl/touchscreen/sdl_touchscreen.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#ifdef USE_HOST
+#include "../sdl_esphome.h"
+#include "esphome/components/touchscreen/touchscreen.h"
+
+namespace esphome {
+namespace sdl {
+
+class SdlTouchscreen : public touchscreen::Touchscreen, public Parented<Sdl> {
+ public:
+  void setup() override {
+    this->x_raw_max_ = this->display_->get_width();
+    this->y_raw_max_ = this->display_->get_height();
+  }
+
+  void update_touches() override {
+    if (this->parent_->mouse_down) {
+      add_raw_touch_position_(0, this->parent_->mouse_x, this->parent_->mouse_y);
+    }
+  }
+};
+
+}  // namespace sdl
+}  // namespace esphome
+#endif