Libretro: Add support for cursor auto-hide

Author: jonian

src/libretro_core.cpp

@@ -1,6 +1,7 @@
 #include <stdexcept>
 #include <cstdio>
 #include <regex>
+#include <chrono>
 
 #include <libretro.h>
 
@@ -20,6 +21,10 @@ static std::filesystem::path savePath;
 static std::string touchScreenMode;
 static bool renderTouchScreen;
 
+static auto cursorTimeout = 0;
+static auto cursorMovedAt = std::chrono::steady_clock::now();
+static bool cursorVisible = false;
+
 static bool screenTouched;
 static int lastMouseX;
 static int lastMouseY;
@@ -168,6 +173,16 @@ static std::string FetchVariable(std::string key, std::string def) {
 	return std::string(var.value);
 }
 
+static int FetchVariableInt(std::string key, int def) {
+	std::string value = FetchVariable(key, std::to_string(def));
+
+	if (!value.empty() && std::isdigit(value[0])) {
+		return std::stoi(value);
+	}
+
+	return 0;
+}
+
 static bool FetchVariableBool(std::string key, bool def) {
 	return FetchVariable(key, def ? "enabled" : "disabled") == "enabled";
 }
@@ -189,6 +204,7 @@ static void configInit() {
 		{"panda3ds_ubershader_lighting_override_threshold", "Light threshold for forcing shadergen; 1|2|3|4|5|6|7|8"},
 		{"panda3ds_touchscreen_mode", "Touchscreen touch mode; Auto|Pointer|Joystick|None"},
 		{"panda3ds_render_touchscreen", "Render touchscreen pointer; disabled|enabled"},
+		{"panda3ds_hide_cursor_timeout", "Hide touchScreen pointer timeout; 3 Seconds|5 Seconds|10 Seconds|15 Seconds|20 Seconds|Never Hide"},
 		{nullptr, nullptr},
 	};
 
@@ -215,6 +231,7 @@ static void configUpdate() {
 
 	touchScreenMode = FetchVariable("panda3ds_touchscreen_mode", "Auto");
 	renderTouchScreen = FetchVariableBool("panda3ds_render_touchscreen", false);
+	cursorTimeout = FetchVariableInt("panda3ds_hide_cursor_timeout", 3);
 
 	config.save();
 }
@@ -228,6 +245,21 @@ static void ConfigCheckVariables() {
 	}
 }
 
+static void UpdateCursorVisibility() {
+	if (renderTouchScreen && cursorTimeout) {
+		if (cursorVisible) {
+			auto current = std::chrono::steady_clock::now();
+			auto elapsed = std::chrono::duration_cast<std::chrono::seconds>(current - cursorMovedAt).count();
+
+			if (elapsed >= cursorTimeout) {
+				cursorVisible = false;
+			}
+		}
+	} else {
+		cursorVisible = true;
+	}
+}
+
 void CursorRenderer::init() {
 #ifdef USING_GLES
 	static const std::string version = R"(
@@ -396,6 +428,7 @@ void retro_reset() {
 
 void retro_run() {
 	ConfigCheckVariables();
+	UpdateCursorVisibility();
 
 	renderer->setFBO(hw_render.get_current_framebuffer());
 	renderer->resetStateManager();
@@ -471,6 +504,11 @@ void retro_run() {
 		}
 	}
 
+	if (cursorTimeout && (pointerX != touchX || pointerY != touchY)) {
+		cursorVisible = true;
+		cursorMovedAt = std::chrono::steady_clock::now();
+	}
+
 	touchX = std::clamp(pointerX, 0, (int)(emulator->width - (offsetX * 2)));
 	touchY = std::clamp(pointerY, 0, (int)(emulator->height - offsetY));
 
@@ -488,7 +526,7 @@ void retro_run() {
 	hid.updateInputs(emulator->getTicks());
 	emulator->runFrame();
 
-	if (renderTouchScreen) {
+	if (renderTouchScreen && cursorVisible) {
 		cursorRenderer->draw(touchX, touchY);
 	}