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Diffstat (limited to 'src/mesa/drivers/dri/r300/r300_reg.h')
-rw-r--r--src/mesa/drivers/dri/r300/r300_reg.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index 8ff362b9d2..0a31f0b978 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -673,6 +673,11 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
/* Special handling for color: When the fragment program uses color,
* the ROUTE_0_COLOR bit is set and ROUTE_0_COLOR_DEST contains the
* color register index.
+ *
+ * Apperently you may set the R300_RS_ROUTE_0_COLOR bit, but not provide any
+ * R300_RS_ROUTE_0_COLOR_DEST value; this setup is used for clearing the state.
+ * See r300_ioctl.c:r300EmitClearState. I'm not sure if this setup is strictly
+ * correct or not. - Oliver.
*/
# define R300_RS_ROUTE_0_COLOR (1 << 14)
# define R300_RS_ROUTE_0_COLOR_DEST_SHIFT 17