From b4412624a9d3288562cac67e3110ee29326a1157 Mon Sep 17 00:00:00 2001
From: Geraint <luffgd@gmail.com>
Date: Sun, 22 Jun 2025 13:53:27 +0100
Subject: [PATCH] Parameter changes and correct value displays

---
 stfx/clap/stfx-clap.h | 37 ++++++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/stfx/clap/stfx-clap.h b/stfx/clap/stfx-clap.h
index f859135..0777d9a 100644
--- a/stfx/clap/stfx-clap.h
+++ b/stfx/clap/stfx-clap.h
@@ -148,11 +148,34 @@ struct Plugin : public clap_plugin {
 	std::vector<float *> outputBuffers;
 	
 	void processEvent(const clap_event_header *header) {
-		LOG_EXPR(header->size);
-		LOG_EXPR(header->time);
-		LOG_EXPR(header->space_id);
-		LOG_EXPR(header->type);
-		LOG_EXPR(header->flags);
+		if (header->space_id != CLAP_CORE_EVENT_SPACE_ID) return; // only core events supported atm
+		if (header->type == CLAP_EVENT_PARAM_VALUE) {
+			auto *event = (clap_event_param_value *)header;
+			auto *param = (Param *)event->cookie;
+			if (!param) {
+				auto paramId = event->param_id;
+				for (auto &p : params) {
+					if (p.id == paramId) {
+						param = &p;
+						break;
+					}
+				}
+				if (!param) return; // invalid parameter
+			} else if (param->id != event->param_id) {
+				return; // inconsistent ID / cookie
+			}
+			if (param->rangeParam) {
+				*param->rangeParam = param->rangeInfo->fromUnit(event->value);
+			} else {
+				*param->steppedParam = int(std::round(event->value));
+			}
+		} else {
+			LOG_EXPR(header->size);
+			LOG_EXPR(header->time);
+			LOG_EXPR(header->space_id);
+			LOG_EXPR(header->type);
+			LOG_EXPR(header->flags);
+		}
 	}
 
 	// CLAP plugin methods
@@ -253,7 +276,7 @@ struct Plugin : public clap_plugin {
 				plugin.processEvent(event);
 				++nextEventIndex;
 			}
-		}		
+		}
 		inputBuffers.resize(0);
 		outputBuffers.resize(0);
 		return CLAP_PROCESS_CONTINUE;
@@ -361,7 +384,7 @@ struct Plugin : public clap_plugin {
 		for (auto &param : plugin.params) {
 			if (param.id == paramId) {
 				if (param.rangeParam) {
-					auto str = param.rangeInfo->toString(value);
+					auto str = param.rangeInfo->toString(param.rangeInfo->fromUnit(value));
 					std::strncpy(text, str.c_str(), textCapacity);
 				} else {
 					auto str = param.steppedInfo->toString(int(std::round(value)));