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-rw-r--r--src/mesa/drivers/dri/r300/r300_ioctl.c2
-rw-r--r--src/mesa/drivers/dri/r300/r300_reg.h5
2 files changed, 6 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/r300/r300_ioctl.c b/src/mesa/drivers/dri/r300/r300_ioctl.c
index 9d828286a6..09968bf239 100644
--- a/src/mesa/drivers/dri/r300/r300_ioctl.c
+++ b/src/mesa/drivers/dri/r300/r300_ioctl.c
@@ -289,7 +289,7 @@ static void r300EmitClearState(GLcontext * ctx)
R300_STATECHANGE(r300, rr);
reg_start(R300_RS_ROUTE_0, 0);
- e32(0x00004000);
+ e32(R300_RS_ROUTE_0_COLOR);
R300_STATECHANGE(r300, fp);
reg_start(R300_PFS_CNTL_0, 2);
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