r300: Use reg definition when available & add missing reg definition.

src/mesa/drivers/dri/r300/r300_ioctl.c

@@ -228,7 +228,7 @@ static void r300EmitClearState(GLcontext * ctx)
 	e32(0);
 	
 	R300_STATECHANGE(r300, unk221C);
-	reg_start(0x221C, 0);
+	reg_start(R300_VAP_UNKNOWN_221C, 0);
 	e32(R300_221C_CLEAR);
 	
 	R300_STATECHANGE(r300, ps);

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

@@ -63,6 +63,12 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define R300_SE_VPORT_ZOFFSET               0x1DAC
 
 
+/*
+ * Vertex Array Processing (VAP) Control
+ * Stolen from r200 code from Christoph Brill (It's a guess!)
+ */
+#define R300_VAP_CNTL	0x2080
+
 /* This register is written directly and also starts data section
  * in many 3d CP_PACKET3's
  */
@@ -135,7 +141,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 /* gap */
 
-#define R300_VAP_CNTL                     0x2140
+#define R300_VAP_CNTL_STATUS              0x2140
 #	define R300_VC_NO_SWAP                  (0 << 0)
 #	define R300_VC_16BIT_SWAP               (1 << 0)
 #	define R300_VC_32BIT_SWAP               (2 << 0)

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

@@ -283,7 +283,7 @@ static void emit_lin_cp(r300ContextPtr rmesa, unsigned long dst, unsigned long s
 		size -= cp_size;
 	}
 	
-	reg_start(0x4e4c,0);
+	reg_start(R300_RB3D_DSTCACHE_CTLSTAT,0);
 	e32(0x0000000a);
 	
 	reg_start(0x342c,0);