From 5ef4e4ffb8053db87f52df3c9b2ddb71d9c7d6e5 Mon Sep 17 00:00:00 2001
From: Roland Scheidegger <sroland@tungstengraphics.com>
Date: Wed, 2 Jul 2008 20:20:33 +0200
Subject: mesa: fix issues around multisample enable

multisample enable is enabled by default, however gl mandates multisample
rendering rules only apply if there's also a multisampled buffer.
---
 src/mesa/main/state.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/mesa/main/state.c')

diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 1c73c5c462..7192bed4a3 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -1060,6 +1060,20 @@ update_viewport_matrix(GLcontext *ctx)
 }
 
 
+/**
+ * Update derived multisample state.
+ */
+static void
+update_multisample(GLcontext *ctx)
+{
+   ctx->Multisample._Enabled = GL_FALSE;
+   if (ctx->DrawBuffer) {
+      if (ctx->DrawBuffer->Visual.sampleBuffers)
+         ctx->Multisample._Enabled = GL_TRUE;
+   }
+}
+
+
 /**
  * Update derived color/blend/logicop state.
  */
@@ -1223,6 +1237,9 @@ _mesa_update_state_locked( GLcontext *ctx )
    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
       update_viewport_matrix(ctx);
 
+   if (new_state & _NEW_MULTISAMPLE)
+      update_multisample( ctx );
+
    if (new_state & _NEW_COLOR)
       update_color( ctx );
 
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