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-rw-r--r--src/mesa/drivers/x11/xm_line.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/drivers/x11/xm_line.c b/src/mesa/drivers/x11/xm_line.c
index 1799503114..edb2a21169 100644
--- a/src/mesa/drivers/x11/xm_line.c
+++ b/src/mesa/drivers/x11/xm_line.c
@@ -578,6 +578,9 @@ get_line_func(GLcontext *ctx)
int depth = GET_VISUAL_DEPTH(xmesa->xm_visual);
struct xmesa_renderbuffer *xrb;
+ if (CHAN_BITS != 8)
+ return NULL;
+
if ((ctx->DrawBuffer->_ColorDrawBufferMask[0]
& (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT)) == 0)
return (swrast_line_func) NULL;