From 1a6eee4ea27923016fac790b47161ce00f2c9b4f Mon Sep 17 00:00:00 2001
From: Dave Parks <davep@lindenlab.com>
Date: Mon, 2 May 2022 11:52:45 -0500
Subject: [PATCH] SL-17321 Fix for some particle systems with custom blend
functions not rendering.
---
indra/newview/lldrawpoolalpha.cpp | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/indra/newview/lldrawpoolalpha.cpp b/indra/newview/lldrawpoolalpha.cpp
index eebd89f77fd..e674707c011 100644
--- a/indra/newview/lldrawpoolalpha.cpp
+++ b/indra/newview/lldrawpoolalpha.cpp
@@ -717,6 +717,16 @@ void LLDrawPoolAlpha::renderAlpha(U32 mask, bool depth_only, bool rigged)
LLGLEnableFunc stencil_test(GL_STENCIL_TEST, params.mSelected, &LLGLCommonFunc::selected_stencil_test);
gGL.blendFunc((LLRender::eBlendFactor) params.mBlendFuncSrc, (LLRender::eBlendFactor) params.mBlendFuncDst, mAlphaSFactor, mAlphaDFactor);
+
+ bool reset_minimum_alpha = false;
+ if (!LLPipeline::sImpostorRender &&
+ params.mBlendFuncDst != LLRender::BF_SOURCE_ALPHA &&
+ params.mBlendFuncSrc != LLRender::BF_SOURCE_ALPHA)
+ { // this draw call has a custom blend function that may require rendering of "invisible" fragments
+ current_shader->setMinimumAlpha(0.f);
+ reset_minimum_alpha = true;
+ }
+
U32 drawMask = mask;
if (params.mFullbright)
{
@@ -729,6 +739,11 @@ void LLDrawPoolAlpha::renderAlpha(U32 mask, bool depth_only, bool rigged)
params.mVertexBuffer->setBufferFast(drawMask);
params.mVertexBuffer->drawRangeFast(params.mDrawMode, params.mStart, params.mEnd, params.mCount, params.mOffset);
+
+ if (reset_minimum_alpha)
+ {
+ current_shader->setMinimumAlpha(MINIMUM_ALPHA);
+ }
}
// If this alpha mesh has glow, then draw it a second time to add the destination-alpha (=glow). Interleaving these state-changing calls is expensive, but glow must be drawn Z-sorted with alpha.
--
GitLab