From 31c027428e8a2fa240b6b5c00f4410d59b971d08 Mon Sep 17 00:00:00 2001
From: Tony Leinonen <tony.leinonen@qt.io>
Date: Tue, 8 Sep 2020 15:44:22 +0300
Subject: Disable alpha test for screen blend mode
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Transparent objects alpha test was set to true when its opacity was 100%
which caused problems with screen blending mode.

Task-number: QT3DS-4110
Change-Id: Ie12e36e442fb265cad6141022200e99b28a9c4cc
Reviewed-by: Kaj Grönholm <kaj.gronholm@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Antti Määttä <antti.maatta@qt.io>
---
 .../rendererimpl/Qt3DSRendererImplLayerRenderPreparationData.cpp       | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/runtimerender/rendererimpl/Qt3DSRendererImplLayerRenderPreparationData.cpp b/src/runtimerender/rendererimpl/Qt3DSRendererImplLayerRenderPreparationData.cpp
index 54cb55f..dc1185c 100644
--- a/src/runtimerender/rendererimpl/Qt3DSRendererImplLayerRenderPreparationData.cpp
+++ b/src/runtimerender/rendererimpl/Qt3DSRendererImplLayerRenderPreparationData.cpp
@@ -824,7 +824,8 @@ namespace render {
         // Enable alpha test, but only if the whole object opacity is full
         // so parts of the object might be fully opaque
         if (renderableFlags & RenderPreparationResultFlagValues::HasTransparency
-                && subsetOpacity >= 1.0f && transparencyImagesHaveOpaquePixels) {
+                && subsetOpacity >= 1.0f && transparencyImagesHaveOpaquePixels
+                && theMaterial->m_BlendMode != DefaultMaterialBlendMode::Screen) {
             m_Renderer.DefaultMaterialShaderKeyProperties()
                     .m_AlphaTestEnabled.SetValue(theGeneratedKey, true);
             renderableFlags.setAlphaTest(true);
-- 
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