r300: Added R300_AA_DISABLE for R300_GB_AA_CONFIG.

src/mesa/drivers/dri/r300/r300_reg.h

@@ -488,6 +488,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #	define R300_GB_W_SELECT_1		(1<<4)
 
 #define R300_GB_AA_CONFIG		0x4020
+#	define R300_AA_DISABLE			0x00
 #	define R300_AA_ENABLE			0x01
 #	define R300_AA_SUBSAMPLES_2		0
 #	define R300_AA_SUBSAMPLES_3		(1<<1)

src/mesa/drivers/dri/r300/r300_state.c

@@ -1983,7 +1983,7 @@ void r300ResetHwState(r300ContextPtr r300)
 							| R300_GB_TILE_SIZE_16;
 	/* set to 0 when fog is disabled? */
 	r300->hw.gb_misc.cmd[R300_GB_MISC_SELECT] = R300_GB_FOG_SELECT_1_1_W;
-	r300->hw.gb_misc.cmd[R300_GB_MISC_AA_CONFIG] = 0x00000000; /* No antialiasing */
+	r300->hw.gb_misc.cmd[R300_GB_MISC_AA_CONFIG] = R300_AA_DISABLE; /* No antialiasing */
 
 	r300->hw.unk4200.cmd[1] = r300PackFloat32(0.0);
 	r300->hw.unk4200.cmd[2] = r300PackFloat32(0.0);