r300g: cleanup the emission of RS block state

Emit as few regs as possible.

src/gallium/drivers/r300/r300_emit.c

@@ -629,17 +629,19 @@ void r300_emit_rs_block_state(struct r300_context* r300, void* state)
     struct r300_rs_block* rs = (struct r300_rs_block*)state;
     unsigned i;
     struct r300_screen* r300screen = r300_screen(r300->context.screen);
+    /* It's the same for both INST and IP tables */
+    unsigned count = (rs->inst_count & R300_RS_INST_COUNT_MASK) + 1;
     CS_LOCALS(r300);
 
     DBG(r300, DBG_DRAW, "r300: RS emit:\n");
 
-    BEGIN_CS(21);
+    BEGIN_CS(5 + count*2);
     if (r300screen->caps->is_r500) {
-        OUT_CS_REG_SEQ(R500_RS_IP_0, 8);
+        OUT_CS_REG_SEQ(R500_RS_IP_0, count);
     } else {
-        OUT_CS_REG_SEQ(R300_RS_IP_0, 8);
+        OUT_CS_REG_SEQ(R300_RS_IP_0, count);
     }
-    for (i = 0; i < 8; i++) {
+    for (i = 0; i < count; i++) {
         OUT_CS(rs->ip[i]);
         DBG(r300, DBG_DRAW, "    : ip %d: 0x%08x\n", i, rs->ip[i]);
     }
@@ -649,11 +651,11 @@ void r300_emit_rs_block_state(struct r300_context* r300, void* state)
     OUT_CS(rs->inst_count);
 
     if (r300screen->caps->is_r500) {
-        OUT_CS_REG_SEQ(R500_RS_INST_0, 8);
+        OUT_CS_REG_SEQ(R500_RS_INST_0, count);
     } else {
-        OUT_CS_REG_SEQ(R300_RS_INST_0, 8);
+        OUT_CS_REG_SEQ(R300_RS_INST_0, count);
     }
-    for (i = 0; i < 8; i++) {
+    for (i = 0; i < count; i++) {
         OUT_CS(rs->inst[i]);
         DBG(r300, DBG_DRAW, "    : inst %d: 0x%08x\n", i, rs->inst[i]);
     }

src/gallium/drivers/r300/r300_state_derived.c

@@ -306,7 +306,7 @@ static void r300_update_rs_block(struct r300_context* r300,
                                  struct r300_shader_semantics* fs_inputs)
 {
     struct r300_rs_block rs = { { 0 } };
-    int i, col_count = 0, tex_count = 0, fp_offset = 0;
+    int i, col_count = 0, tex_count = 0, fp_offset = 0, count;
     void (*rX00_rs_col)(struct r300_rs_block*, int, int, boolean);
     void (*rX00_rs_col_write)(struct r300_rs_block*, int, int);
     void (*rX00_rs_tex)(struct r300_rs_block*, int, int, boolean);
@@ -410,11 +410,13 @@ static void r300_update_rs_block(struct r300_context* r300,
     rs.count = (tex_count*4) | (col_count << R300_IC_COUNT_SHIFT) |
         R300_HIRES_EN;
 
-    rs.inst_count = MAX3(col_count - 1, tex_count - 1, 0);
+    count = MAX3(col_count, tex_count, 1);
+    rs.inst_count = count - 1;
 
     /* Now, after all that, see if we actually need to update the state. */
     if (memcmp(r300->rs_block_state.state, &rs, sizeof(struct r300_rs_block))) {
         memcpy(r300->rs_block_state.state, &rs, sizeof(struct r300_rs_block));
+        r300->rs_block_state.size = 5 + count;
         r300->rs_block_state.dirty = TRUE;
     }
 }