1 files changed, 10 insertions, 4 deletions
diff --git a/src/mesa/drivers/glide/fxsetup.c b/src/mesa/drivers/glide/fxsetup.c
index e8c75b7c4a..5e82443d78 100644
--- a/src/mesa/drivers/glide/fxsetup.c
+++ b/src/mesa/drivers/glide/fxsetup.c
@@ -1411,14 +1411,20 @@ static void fxSetupColorMask(GLcontext *ctx)
 {
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
 
-  FX_grColorMask(ctx->Color.ColorMask[RCOMP] ||
-	      ctx->Color.ColorMask[GCOMP] ||
-	      ctx->Color.ColorMask[BCOMP],
-	      ctx->Color.ColorMask[ACOMP] && fxMesa->haveAlphaBuffer);
+  if (ctx->Color.DrawBuffer == GL_NONE) {
+    FX_grColorMask(FXFALSE, FXFALSE);
+  }
+  else {
+    FX_grColorMask(ctx->Color.ColorMask[RCOMP] ||
+                   ctx->Color.ColorMask[GCOMP] ||
+                   ctx->Color.ColorMask[BCOMP],
+                   ctx->Color.ColorMask[ACOMP] && fxMesa->haveAlphaBuffer);
+  }
 }
 
 
 
+
 /************************************************************************/
 /**************************** Fog Mode SetUp ****************************/
 /************************************************************************/