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-rw-r--r--src/mesa/main/state.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 315253d90a..344af91e17 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -289,6 +289,20 @@ 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.
*/
static void
@@ -425,6 +439,9 @@ _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 );