nv2a: Add support for PGRAPH RDI select 0x17

dtc

@@ -1 +1 @@
-Subproject commit 88f18909db731a627456f26d779445f84e449536
+Subproject commit e54388015af1fb4bf04d0bca99caba1074d9cc42

hw/xbox/nv2a/nv2a_pgraph.c

@@ -305,6 +305,10 @@ static uint32_t pgraph_rdi_read(PGRAPHState *pg,
 {
     uint32_t r = 0;
     switch(select) {
+    case RDI_INDEX_VTX_CONSTANTS0:
+        assert((address / 4) < NV2A_VERTEXSHADER_CONSTANTS);
+        r = pg->vsh_constants[address / 4][3 - address % 4];
+        break;
     default:
         fprintf(stderr, "nv2a: unknown rdi read select 0x%x address 0x%x\n",
                 select, address);
@@ -319,6 +323,13 @@ static void pgraph_rdi_write(PGRAPHState *pg,
                              uint32_t val)
 {
     switch(select) {
+    case RDI_INDEX_VTX_CONSTANTS0:
+        assert(false); /* Untested */
+        assert((address / 4) < NV2A_VERTEXSHADER_CONSTANTS);
+        pg->vsh_constants_dirty[address / 4] |=
+            (val != pg->vsh_constants[address / 4][3 - address % 4]);
+        pg->vsh_constants[address / 4][3 - address % 4] = val;
+        break;
     default:
         NV2A_DPRINTF("unknown rdi write select 0x%x, address 0x%x, val 0x%08x\n",
                      select, address, val);

hw/xbox/nv2a/nv2a_regs.h

@@ -1286,6 +1286,13 @@
 #define NV_IGRAPH_XF_LTC1_L6                         0x12
 #define NV_IGRAPH_XF_LTC1_L7                         0x13
 
+/* These RDI select values appear to be named by MS.
+ * nvidia seems to refer to RDI_INDEX_VTX_CONSTANTS0 by RDI_RAMSEL_XL_XFCTX.
+ * However, we don't have other nvidia names; so we use these aliases for now.
+ * Eventually we'll probably adopt nouveau names for these internals.
+ */
+#define RDI_INDEX_VTX_CONSTANTS0                     0x17
+
 
 #define NV2A_VERTEX_ATTR_POSITION       0
 #define NV2A_VERTEX_ATTR_WEIGHT         1