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authorOliver McFadden <z3ro.geek@gmail.com>2007-05-28 01:11:54 +0000
committerOliver McFadden <z3ro.geek@gmail.com>2007-05-30 03:19:26 +0000
commit97a89227b0edd3ef51d3ef9fd015bff12dc9b97b (patch)
tree0bc08b00d20af75983177c2a6668f8c580abd481 /src/mesa/drivers/dri/r300
parent779a5c160ff45428279e1ef997fd36338226df39 (diff)
r300: Document registers 0x2220 to 0x2230.
These registers are per-pixel and per-vertex X and Y clipping planes.
Diffstat (limited to 'src/mesa/drivers/dri/r300')
-rw-r--r--src/mesa/drivers/dri/r300/r300_cmdbuf.c4
-rw-r--r--src/mesa/drivers/dri/r300/r300_context.h2
-rw-r--r--src/mesa/drivers/dri/r300/r300_reg.h10
-rw-r--r--src/mesa/drivers/dri/r300/r300_state.c8
4 files changed, 17 insertions, 7 deletions
diff --git a/src/mesa/drivers/dri/r300/r300_cmdbuf.c b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
index 0351989b2e..0bc3be8880 100644
--- a/src/mesa/drivers/dri/r300/r300_cmdbuf.c
+++ b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
@@ -318,8 +318,8 @@ void r300InitCmdBuf(r300ContextPtr r300)
r300->hw.unk21DC.cmd[0] = cmdpacket0(0x21DC, 1);
ALLOC_STATE(unk221C, always, 2, 0);
r300->hw.unk221C.cmd[0] = cmdpacket0(R300_VAP_UNKNOWN_221C, 1);
- ALLOC_STATE(unk2220, always, 5, 0);
- r300->hw.unk2220.cmd[0] = cmdpacket0(0x2220, 4);
+ ALLOC_STATE(vap_clip, always, 5, 0);
+ r300->hw.vap_clip.cmd[0] = cmdpacket0(R300_VAP_CLIP_X_0, 4);
ALLOC_STATE(unk2288, always, 2, 0);
r300->hw.unk2288.cmd[0] = cmdpacket0(R300_VAP_UNKNOWN_2288, 1);
ALLOC_STATE(vof, always, R300_VOF_CMDSIZE, 0);
diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 6bd74fe9cd..076bb49a00 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -452,7 +452,7 @@ struct r300_hw_state {
struct r300_state_atom vic; /* vap input control (2180) */
struct r300_state_atom unk21DC; /* (21DC) */
struct r300_state_atom unk221C; /* (221C) */
- struct r300_state_atom unk2220; /* (2220) */
+ struct r300_state_atom vap_clip;
struct r300_state_atom unk2288; /* (2288) */
struct r300_state_atom pvs; /* pvs_cntl (22D0) */
struct r300_state_atom gb_enable; /* (4008) */
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index 3f14dafc70..6f0ed4d74e 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -299,6 +299,16 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
# define R300_221C_NORMAL 0x00000000
# define R300_221C_CLEAR 0x0001C000
+/* These seem to be per-pixel and per-vertex X and Y clipping planes. The first
+ * plane is per-pixel and the second plane is per-vertex.
+ *
+ * This was determined by experimentation alone but I believe it is correct.
+ */
+#define R300_VAP_CLIP_X_0 0x2220
+#define R300_VAP_CLIP_X_1 0x2224
+#define R300_VAP_CLIP_Y_0 0x2228
+#define R300_VAP_CLIP_Y_1 0x2230
+
/* gap */
/* Sometimes, END_OF_PKT and 0x2284=0 are the only commands sent between
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index a9b20622e4..38cf9d29a7 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -1882,10 +1882,10 @@ static void r300ResetHwState(r300ContextPtr r300)
r300->hw.unk221C.cmd[1] = R300_221C_NORMAL;
- r300->hw.unk2220.cmd[1] = r300PackFloat32(1.0);
- r300->hw.unk2220.cmd[2] = r300PackFloat32(1.0);
- r300->hw.unk2220.cmd[3] = r300PackFloat32(1.0);
- r300->hw.unk2220.cmd[4] = r300PackFloat32(1.0);
+ r300->hw.vap_clip.cmd[1] = r300PackFloat32(1.0); /* X */
+ r300->hw.vap_clip.cmd[2] = r300PackFloat32(1.0); /* X */
+ r300->hw.vap_clip.cmd[3] = r300PackFloat32(1.0); /* Y */
+ r300->hw.vap_clip.cmd[4] = r300PackFloat32(1.0); /* Y */
/* XXX: Other families? */
switch (r300->radeon.radeonScreen->chip_family) {