Guess another unknown register in R300 command buffer initialization. (Oliver McFadden)

4 files changed, 6 insertions, 5 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_cmdbuf.c b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
index d5f4c917f0..89725447f1 100644
--- a/src/mesa/drivers/dri/r300/r300_cmdbuf.c
+++ b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
@@ -341,8 +341,8 @@ void r300InitCmdBuf(r300ContextPtr r300)
 		r300->hw.polygon_mode.cmd[0] = cmdpacket0(R300_RE_POLYGON_MODE, 3);
 	ALLOC_STATE( fogp, always, 3, "fogp", 0 );
 		r300->hw.fogp.cmd[0] = cmdpacket0(R300_RE_FOG_SCALE, 2);
-	ALLOC_STATE( unk42A0, always, 2, "unk42A0", 0 );
-		r300->hw.unk42A0.cmd[0] = cmdpacket0(0x42A0, 1);
+	ALLOC_STATE( zbias_cntl, always, 2, "zbias_cntl", 0 );
+		r300->hw.zbias_cntl.cmd[0] = cmdpacket0(R300_RE_ZBIAS_CNTL, 1);
 	ALLOC_STATE( zbs, always, R300_ZBS_CMDSIZE, "zbs", 0 );
 		r300->hw.zbs.cmd[R300_ZBS_CMD_0] = cmdpacket0(R300_RE_ZBIAS_T_FACTOR, 4);
 	ALLOC_STATE( occlusion_cntl, always, 2, "occlusion_cntl", 0 );
@@ -481,7 +481,7 @@ void r300InitCmdBuf(r300ContextPtr r300)
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.shade);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.polygon_mode);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.fogp);
-	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk42A0);
+	insert_at_tail(&r300->hw.atomlist, &r300->hw.zbias_cntl);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.zbs);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.occlusion_cntl);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.cul);
diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 43de5dfea3..bd9ed6f170 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -457,7 +457,7 @@ struct r300_hw_state {
 	struct r300_state_atom polygon_mode;
 	struct r300_state_atom fogp;	/* fog parameters (4294) */
 	struct r300_state_atom unk429C; /* (429C) */
-	struct r300_state_atom unk42A0;	/* (42A0) */
+	struct r300_state_atom zbias_cntl;
 	struct r300_state_atom zbs;	/* zbias (42A4) */
 	struct r300_state_atom occlusion_cntl;
 	struct r300_state_atom cul;	/* cull cntl (42B8) */
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index 69bc994cf6..7bc832c871 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -571,6 +571,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
  * Some of the tests indicate that fgl has a fallback implementation of zbias
  * via pixel shaders.
  */
+#define R300_RE_ZBIAS_CNTL                    0x42A0 /* GUESS */
 #define R300_RE_ZBIAS_T_FACTOR                0x42A4
 #define R300_RE_ZBIAS_T_CONSTANT              0x42A8
 #define R300_RE_ZBIAS_W_FACTOR                0x42AC
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index 402f7508a4..895c2ff43c 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -2089,7 +2089,7 @@ void r300ResetHwState(r300ContextPtr r300)
 	r300PolygonMode(ctx, GL_BACK, ctx->Polygon.BackMode);
 	r300->hw.polygon_mode.cmd[2] = 0x00000001;
 	r300->hw.polygon_mode.cmd[3] = 0x00000000;
-	r300->hw.unk42A0.cmd[1] = 0x00000000;
+	r300->hw.zbias_cntl.cmd[1] = 0x00000000;
 
 	r300PolygonOffset(ctx, ctx->Polygon.OffsetFactor, ctx->Polygon.OffsetUnits);
 	r300Enable(ctx, GL_POLYGON_OFFSET_FILL, ctx->Polygon.OffsetFill);