i965: checkpoint commit: VS constant buffers

Hook up a constant buffer, binding table, etc for the VS unit.
This will allow using large constant buffers with vertex shaders.
The new code is disabled at this time (use_const_buffer=FALSE).

1 files changed, 63 insertions, 3 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index ec4d7fa76f..bb7ea5c049 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -952,7 +952,7 @@ void brw_dp_READ_16( struct brw_compile *p,
 
 /**
  * Read a float[4] vector from the data port Data Cache (const buffer).
- * Scratch offset should be a multiple of 16.
+ * Location (in buffer) should be a multiple of 16.
  * Used for fetching shader constants.
  * If relAddr is true, we'll do an indirect fetch using the address register.
  */
@@ -960,7 +960,7 @@ void brw_dp_READ_4( struct brw_compile *p,
                     struct brw_reg dest,
                     GLuint msg_reg_nr,
                     GLboolean relAddr,
-                    GLuint scratch_offset,
+                    GLuint location,
                     GLuint bind_table_index )
 {
    {
@@ -971,7 +971,7 @@ void brw_dp_READ_4( struct brw_compile *p,
       /* set message header global offset field (reg 0, element 2) */
       brw_MOV(p,
 	      retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_UD),
-	      brw_imm_d(scratch_offset));
+	      brw_imm_d(location));
       brw_pop_insn_state(p);
    }
 
@@ -1001,6 +1001,66 @@ void brw_dp_READ_4( struct brw_compile *p,
 }
 
 
+/* XXX this function is temporary - merge with brw_dp_READ_4() above. */
+void brw_dp_READ_4_vs(struct brw_compile *p,
+                      struct brw_reg dest,
+                      struct brw_reg src,
+                      GLuint msg_reg_nr,
+                      GLboolean relAddr,
+                      GLuint location,
+                      GLuint bind_table_index)
+{
+   {
+      brw_push_insn_state(p);
+      brw_set_compression_control(p, BRW_COMPRESSION_NONE);
+      brw_set_mask_control(p, BRW_MASK_DISABLE);
+
+      /*src.nr = 0;*/
+
+      /* set message header global offset field (reg 0, element 2) */
+      brw_MOV(p,
+#if 1
+	      retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_UD),
+#elif 0
+	      retype(brw_vec1_grf(src.nr, 2), BRW_REGISTER_TYPE_UD),
+#endif
+	      brw_imm_d(location));
+
+      brw_pop_insn_state(p);
+   }
+
+   {
+      struct brw_instruction *insn = next_insn(p, BRW_OPCODE_SEND);
+   
+      insn->header.predicate_control = BRW_PREDICATE_NONE;
+      insn->header.compression_control = BRW_COMPRESSION_NONE; 
+      insn->header.destreg__conditonalmod = msg_reg_nr;
+      insn->header.mask_control = BRW_MASK_DISABLE;
+  
+      /* cast dest to a uword[8] vector */
+      //      dest = retype(vec8(dest), BRW_REGISTER_TYPE_UW);
+
+      brw_set_dest(insn, dest);
+#if 1
+      brw_set_src0(insn, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW));
+#elif 0
+      brw_set_src0(insn, retype(brw_vec8_grf(src.nr, 0), BRW_REGISTER_TYPE_UW));
+#endif
+
+      printf("vs const read msg, location %u, msg_reg_nr %d\n", location, msg_reg_nr);
+      brw_set_dp_read_message(insn,
+			      bind_table_index,
+			      0,  /* msg_control (0 means 1 Oword) */
+			      BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
+			      0, /* source cache = data cache */
+			      1, /* msg_length */
+			      1, /* response_length (1 Oword) */
+			      0); /* eot */
+   }
+}
+
+
+
 void brw_fb_WRITE(struct brw_compile *p,
                   struct brw_reg dest,
                   GLuint msg_reg_nr,