r500: Use 8bit fog alpha compare value.

This fixes transparency issues on r500 by enabling
backwards compatibility with the r300 alpha compare value.

diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index cb39ce0..dc14759 100644 (file)
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -479,6 +479,7 @@ static void r300SetAlphaState(GLcontext * ctx)
 
        if (really_enabled) {
                pp_misc |= R300_FG_ALPHA_FUNC_ENABLE;
+               pp_misc |= R500_FG_ALPHA_FUNC_8BIT;
                pp_misc |= (refByte & R300_FG_ALPHA_FUNC_VAL_MASK);
        } else {
                pp_misc = 0x0;