tgsi: add TGSI_TEXTURE_SHADOWCUBEMAP

This adds support for shadow cubemap texture sampling instructions.

This is required for GL 3.0.

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/auxiliary/tgsi/tgsi_exec.c

                   &r[0], &r[1], &r[2], &r[3]);  /* outputs */
       break;
    case TGSI_TEXTURE_SHADOW2D_ARRAY:
+   case TGSI_TEXTURE_SHADOWCUBE:
       FETCH(&r[0], 0, CHAN_X);
       FETCH(&r[1], 0, CHAN_Y);
       FETCH(&r[2], 0, CHAN_Z);
       break;
 
    case TGSI_TEXTURE_SHADOW2D_ARRAY:
+   case TGSI_TEXTURE_SHADOWCUBE:
       FETCH(&r[0], 0, CHAN_X);
       FETCH(&r[1], 0, CHAN_Y);
       FETCH(&r[2], 0, CHAN_Z);

src/gallium/auxiliary/tgsi/tgsi_strings.c

    "2DARRAY",
    "SHADOW1DARRAY",
    "SHADOW2DARRAY",
+   "SHADOWCUBE"
 };
 
 const char *tgsi_property_names[TGSI_PROPERTY_COUNT] =

src/gallium/auxiliary/tgsi/tgsi_util.c

             read_mask = TGSI_WRITEMASK_XYZ;
             break;
          case TGSI_TEXTURE_SHADOW2D_ARRAY:
+         case TGSI_TEXTURE_SHADOWCUBE:
             read_mask = TGSI_WRITEMASK_XYZW;
             break;
          default:

src/gallium/include/pipe/p_shader_tokens.h

 #define TGSI_TEXTURE_2D_ARRAY       10
 #define TGSI_TEXTURE_SHADOW1D_ARRAY 11
 #define TGSI_TEXTURE_SHADOW2D_ARRAY 12
-#define TGSI_TEXTURE_COUNT          13
+#define TGSI_TEXTURE_SHADOWCUBE     13
+#define TGSI_TEXTURE_COUNT          14
 
 struct tgsi_instruction_texture
 {