lima/ppir: Add gl_FrontFace handling

Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Qiang Yu <yuq825@gmail.com>

src/gallium/drivers/lima/ir/pp/codegen.c

@@ -57,7 +57,8 @@ static void ppir_codegen_encode_varying(ppir_node *node, void *code)
       assert(node->op == ppir_op_load_varying ||
              node->op == ppir_op_load_coords ||
              node->op == ppir_op_load_fragcoord ||
-             node->op == ppir_op_load_pointcoord);
+             node->op == ppir_op_load_pointcoord ||
+             node->op == ppir_op_load_frontface);
 
       f->imm.dest = index >> 2;
       f->imm.mask = dest->write_mask << (index & 0x3);
@@ -79,6 +80,10 @@ static void ppir_codegen_encode_varying(ppir_node *node, void *code)
          case ppir_op_load_pointcoord:
             f->imm.source_type = 3;
             break;
+         case ppir_op_load_frontface:
+            f->imm.source_type = 3;
+            f->imm.perspective = 1;
+            break;
          default:
             break;
       }

src/gallium/drivers/lima/ir/pp/nir.c

@@ -271,21 +271,28 @@ static ppir_node *ppir_emit_intrinsic(ppir_block *block, nir_instr *ni)
       return &lnode->node;
 
    case nir_intrinsic_load_frag_coord:
-      if (!instr->dest.is_ssa)
-         mask = u_bit_consecutive(0, instr->num_components);
-
-      lnode = ppir_node_create_dest(block, ppir_op_load_fragcoord, &instr->dest, mask);
-      if (!lnode)
-         return NULL;
-
-      lnode->num_components = instr->num_components;
-      return &lnode->node;
-
    case nir_intrinsic_load_point_coord:
+   case nir_intrinsic_load_front_face:
       if (!instr->dest.is_ssa)
          mask = u_bit_consecutive(0, instr->num_components);
 
-      lnode = ppir_node_create_dest(block, ppir_op_load_pointcoord, &instr->dest, mask);
+      ppir_op op;
+      switch (instr->intrinsic) {
+      case nir_intrinsic_load_frag_coord:
+         op = ppir_op_load_fragcoord;
+         break;
+      case nir_intrinsic_load_point_coord:
+         op = ppir_op_load_pointcoord;
+         break;
+      case nir_intrinsic_load_front_face:
+         op = ppir_op_load_frontface;
+         break;
+      default:
+         assert(0);
+         break;
+      }
+
+      lnode = ppir_node_create_dest(block, op, &instr->dest, mask);
       if (!lnode)
          return NULL;
 

src/gallium/drivers/lima/ir/pp/node.c

@@ -252,6 +252,13 @@ const ppir_op_info ppir_op_infos[] = {
          PPIR_INSTR_SLOT_VARYING, PPIR_INSTR_SLOT_END
       },
    },
+   [ppir_op_load_frontface] = {
+      .name = "ld_frontface",
+      .type = ppir_node_type_load,
+      .slots = (int []) {
+         PPIR_INSTR_SLOT_VARYING, PPIR_INSTR_SLOT_END
+      },
+   },
    [ppir_op_load_uniform] = {
       .name = "ld_uni",
       .type = ppir_node_type_load,

src/gallium/drivers/lima/ir/pp/node_to_instr.c

@@ -233,7 +233,8 @@ static bool ppir_do_node_to_instr(ppir_block *block, ppir_node *node)
       }
       else if (node->op == ppir_op_load_varying ||
                node->op == ppir_op_load_fragcoord ||
-               node->op == ppir_op_load_pointcoord) {
+               node->op == ppir_op_load_pointcoord ||
+               node->op == ppir_op_load_frontface) {
          /* delay the load varying dup to scheduler */
          if (!create_new_instr(block, node))
             return false;

src/gallium/drivers/lima/ir/pp/ppir.h

@@ -100,6 +100,7 @@ typedef enum {
    ppir_op_load_coords,
    ppir_op_load_fragcoord,
    ppir_op_load_pointcoord,
+   ppir_op_load_frontface,
    ppir_op_load_texture,
    ppir_op_load_temp,
 

src/gallium/drivers/lima/lima_screen.c

@@ -118,6 +118,7 @@ lima_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
    case PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL:
+   case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
       return 1;
 
    case PIPE_CAP_MAX_TEXTURE_2D_SIZE: