From 38caf1a5f0d71748c47918acebfc15116194bcf3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tur=C3=A1nszki=20J=C3=A1nos?= <turanszkij@gmail.com>
Date: Mon, 7 Jul 2025 08:31:24 +0200
Subject: [PATCH] improved MSAA instance transparency

---
 WickedEngine/shaders/objectHF.hlsli | 35 +++++++++++++++++++----------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/WickedEngine/shaders/objectHF.hlsli b/WickedEngine/shaders/objectHF.hlsli
index e36399c62..3054acb18 100644
--- a/WickedEngine/shaders/objectHF.hlsli
+++ b/WickedEngine/shaders/objectHF.hlsli
@@ -515,17 +515,6 @@ float4 main(PixelInput input, in bool is_frontface : SV_IsFrontFace APPEND_COVER
 	write_mipmap_feedback(push.materialIndex, ddx_coarse(uvsets), ddy_coarse(uvsets));
 #endif // TILEDFORWARD
 
-#ifndef DISABLE_ALPHATEST
-#ifndef TRANSPARENT
-#ifndef ENVMAPRENDERING
-#ifdef OBJECTSHADER_USE_DITHERING
-	// apply dithering:
-	clip(dither(pixel + GetTemporalAASampleRotation()) - input.GetDither());
-#endif // OBJECTSHADER_USE_DITHERING
-#endif // DISABLE_ALPHATEST
-#endif // TRANSPARENT
-#endif // ENVMAPRENDERING
-
 #ifdef OBJECTSHADER_USE_INSTANCEINDEX
 	ShaderMeshInstance meshinstance = load_instance(input.GetInstanceIndex());
 #endif // OBJECTSHADER_USE_INSTANCEINDEX
@@ -1078,8 +1067,30 @@ float4 main(PixelInput input, in bool is_frontface : SV_IsFrontFace APPEND_COVER
 
 	color = saturateMediump(color);
 
+	half alphatest = material.GetAlphaTest() + meshinstance.GetAlphaTest();
+
 #ifndef DISABLE_ALPHATEST
-	coverage = AlphaToCoverage(color.a, material.GetAlphaTest() + meshinstance.GetAlphaTest(), input.pos); // opaque soft alpha test (MSAA, temporal AA support)
+#ifndef TRANSPARENT
+#ifndef ENVMAPRENDERING
+#ifdef OBJECTSHADER_USE_DITHERING
+	// apply dithering:
+	if (GetCamera().sample_count > 1)
+	{
+		// AlphaToCoverage will handle it as transparent instead of dithering:
+		color.a -= input.GetDither();
+		alphatest += input.GetDither();
+	}
+	else
+	{
+		clip(dither(pixel + GetTemporalAASampleRotation()) - input.GetDither());
+	}
+#endif // OBJECTSHADER_USE_DITHERING
+#endif // DISABLE_ALPHATEST
+#endif // TRANSPARENT
+#endif // ENVMAPRENDERING
+
+#ifndef DISABLE_ALPHATEST
+	coverage = AlphaToCoverage(color.a, alphatest, input.pos); // opaque soft alpha test (MSAA, temporal AA support)
 #endif // DISABLE_ALPHATEST
 	
 	// end point: