lima/ppir: Add gl_PointCoord handling

Treat gl_PointCoord as a system value and
add the necessary bits for correct codegen.

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

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

@@ -56,7 +56,8 @@ static void ppir_codegen_encode_varying(ppir_node *node, void *code)
    if (num_components) {
       assert(node->op == ppir_op_load_varying ||
              node->op == ppir_op_load_coords ||
-             node->op == ppir_op_load_fragcoord);
+             node->op == ppir_op_load_fragcoord ||
+             node->op == ppir_op_load_pointcoord);
 
       f->imm.dest = index >> 2;
       f->imm.mask = dest->write_mask << (index & 0x3);
@@ -70,9 +71,16 @@ static void ppir_codegen_encode_varying(ppir_node *node, void *code)
       else
          f->imm.index = load->index >> alignment;
 
-      if (node->op == ppir_op_load_fragcoord) {
-         f->imm.source_type = 2;
-         f->imm.perspective = 3;
+      switch (node->op) {
+         case ppir_op_load_fragcoord:
+            f->imm.source_type = 2;
+            f->imm.perspective = 3;
+            break;
+         case ppir_op_load_pointcoord:
+            f->imm.source_type = 3;
+            break;
+         default:
+            break;
       }
    }
    else {

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

@@ -285,6 +285,17 @@ static ppir_node *ppir_emit_intrinsic(ppir_block *block, nir_instr *ni)
       lnode->num_components = instr->num_components;
       return &lnode->node;
 
+   case nir_intrinsic_load_point_coord:
+      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);
+      if (!lnode)
+         return NULL;
+
+      lnode->num_components = instr->num_components;
+      return &lnode->node;
+
    case nir_intrinsic_load_uniform:
       if (!instr->dest.is_ssa)
          mask = u_bit_consecutive(0, instr->num_components);

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

@@ -254,6 +254,13 @@ const ppir_op_info ppir_op_infos[] = {
          PPIR_INSTR_SLOT_VARYING, PPIR_INSTR_SLOT_END
       },
    },
+   [ppir_op_load_pointcoord] = {
+      .name = "ld_pointcoord",
+      .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

@@ -240,7 +240,8 @@ static bool ppir_do_node_to_instr(ppir_block *block, ppir_node *node)
          load->dest.pipeline = ppir_pipeline_reg_uniform;
       }
       else if (node->op == ppir_op_load_varying ||
-               node->op == ppir_op_load_fragcoord) {
+               node->op == ppir_op_load_fragcoord ||
+               node->op == ppir_op_load_pointcoord) {
          /* delay the load varying dup to scheduler */
          if (!create_new_instr(block, node))
             return false;

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

@@ -103,6 +103,7 @@ typedef enum {
    ppir_op_load_varying,
    ppir_op_load_coords,
    ppir_op_load_fragcoord,
+   ppir_op_load_pointcoord,
    ppir_op_load_texture,
    ppir_op_load_temp,
 

src/gallium/drivers/lima/lima_screen.c

@@ -117,6 +117,7 @@ lima_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 1;
 
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
+   case PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL:
       return 1;
 
    case PIPE_CAP_MAX_TEXTURE_2D_SIZE: