From d9ec14e048fd1a485ea3caac8b755f1ac0ecd6ba Mon Sep 17 00:00:00 2001
From: Flyinghead <raphael.jean@gmail.com>
Date: Tue, 9 May 2023 21:28:22 +0200
Subject: [PATCH] rend: rtt can also use SCALER_CTL.hscale

Issue #1025
---
 core/rend/transform_matrix.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/rend/transform_matrix.h b/core/rend/transform_matrix.h
index 19af8ddcb..f3291354d 100644
--- a/core/rend/transform_matrix.h
+++ b/core/rend/transform_matrix.h
@@ -111,6 +111,8 @@ public:
 		if (renderingContext->isRTT)
 		{
 			dcViewport.x = (float)(renderingContext->fb_X_CLIP.max - renderingContext->fb_X_CLIP.min + 1);
+			if (renderingContext->scaler_ctl.hscale)
+				dcViewport.x *= 2;
 			dcViewport.y = (float)(renderingContext->fb_Y_CLIP.max - renderingContext->fb_Y_CLIP.min + 1);
 			normalMatrix = glm::translate(glm::vec3(-1, -rttFlipY, 0))
 				* glm::scale(glm::vec3(2.0f / dcViewport.x, 2.0f / dcViewport.y * rttFlipY, 1.f));