gallium: plumb invariant output attrib thru TGSI

Add support for glsl 'invariant' modifier for output data declarations.
Gallium drivers that use TGSI serialization currently loose invariant
modifiers in glsl shaders.

v2: use boolean for invariant instead of unsigned.

Tested: chromiumos on qemu with virglrenderer.
Reviewed-by: Marek Olšák <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

5 files changed, 39 insertions, 13 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index 4f28b49ce8a..434871273f2 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -185,6 +185,8 @@ const char *tgsi_interpolate_locations[TGSI_INTERPOLATE_LOC_COUNT] =
    "SAMPLE",
 };
 
+const char *tgsi_invariant_name = "INVARIANT";
+
 const char *tgsi_primitive_names[PIPE_PRIM_MAX] =
 {
    "POINTS",
diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.h b/src/gallium/auxiliary/tgsi/tgsi_strings.h
index bb2d3458dde..20e3f7127f6 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.h
@@ -52,6 +52,8 @@ extern const char *tgsi_interpolate_names[TGSI_INTERPOLATE_COUNT];
 
 extern const char *tgsi_interpolate_locations[TGSI_INTERPOLATE_LOC_COUNT];
 
+extern const char *tgsi_invariant_name;
+
 extern const char *tgsi_primitive_names[PIPE_PRIM_MAX];
 
 extern const char *tgsi_fs_coord_origin_names[2];
diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c b/src/gallium/auxiliary/tgsi/tgsi_text.c
index 55a814994e0..9779f212cb1 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_text.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
@@ -1586,10 +1586,6 @@ static boolean parse_declaration( struct translate_ctx *ctx )
             break;
          }
       }
-      if (i == TGSI_INTERPOLATE_COUNT) {
-         report_error( ctx, "Expected semantic or interpolate attribute" );
-         return FALSE;
-      }
    }
 
    cur = ctx->cur;
@@ -1609,6 +1605,20 @@ static boolean parse_declaration( struct translate_ctx *ctx )
       }
    }
 
+   cur = ctx->cur;
+   eat_opt_white( &cur );
+   if (*cur == ',' && !is_vs_input) {
+      cur++;
+      eat_opt_white( &cur );
+      if (str_match_nocase_whole( &cur, tgsi_invariant_name )) {
+         decl.Declaration.Invariant = 1;
+         ctx->cur = cur;
+      } else {
+         report_error( ctx, "Expected semantic, interpolate attribute, or invariant ");
+         return FALSE;
+      }
+   }
+
    advance = tgsi_build_full_declaration(
       &decl,
       ctx->tokens_cur,
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.c b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
index 02fbf0181f0..c0f60985f79 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
@@ -140,6 +140,7 @@ struct ureg_program
       unsigned first;
       unsigned last;
       unsigned array_id;
+      boolean invariant;
    } output[UREG_MAX_OUTPUT];
    unsigned nr_outputs, nr_output_regs;
 
@@ -427,7 +428,8 @@ ureg_DECL_output_layout(struct ureg_program *ureg,
                         unsigned index,
                         unsigned usage_mask,
                         unsigned array_id,
-                        unsigned array_size)
+                        unsigned array_size,
+                        boolean invariant)
 {
    unsigned i;
 
@@ -455,6 +457,7 @@ ureg_DECL_output_layout(struct ureg_program *ureg,
       ureg->output[i].first = index;
       ureg->output[i].last = index + array_size - 1;
       ureg->output[i].array_id = array_id;
+      ureg->output[i].invariant = invariant;
       ureg->nr_output_regs = MAX2(ureg->nr_output_regs, index + array_size);
       ureg->nr_outputs++;
    }
@@ -480,7 +483,8 @@ ureg_DECL_output_masked(struct ureg_program *ureg,
                         unsigned array_size)
 {
    return ureg_DECL_output_layout(ureg, name, index, 0,
-                                  ureg->nr_output_regs, usage_mask, array_id, array_size);
+                                  ureg->nr_output_regs, usage_mask, array_id,
+                                  array_size, FALSE);
 }
 
 
@@ -1511,7 +1515,8 @@ emit_decl_semantic(struct ureg_program *ureg,
                    unsigned semantic_index,
                    unsigned streams,
                    unsigned usage_mask,
-                   unsigned array_id)
+                   unsigned array_id,
+                   boolean invariant)
 {
    union tgsi_any_token *out = get_tokens(ureg, DOMAIN_DECL, array_id ? 4 : 3);
 
@@ -1522,6 +1527,7 @@ emit_decl_semantic(struct ureg_program *ureg,
    out[0].decl.UsageMask = usage_mask;
    out[0].decl.Semantic = 1;
    out[0].decl.Array = array_id != 0;
+   out[0].decl.Invariant = invariant;
 
    out[1].value = 0;
    out[1].decl_range.First = first;
@@ -1869,7 +1875,8 @@ static void emit_decls( struct ureg_program *ureg )
                                ureg->input[i].semantic_index,
                                0,
                                TGSI_WRITEMASK_XYZW,
-                               ureg->input[i].array_id);
+                               ureg->input[i].array_id,
+                               FALSE);
          }
       }
       else {
@@ -1882,7 +1889,7 @@ static void emit_decls( struct ureg_program *ureg )
                                   ureg->input[i].semantic_index +
                                   (j - ureg->input[i].first),
                                   0,
-                                  TGSI_WRITEMASK_XYZW, 0);
+                                  TGSI_WRITEMASK_XYZW, 0, FALSE);
             }
          }
       }
@@ -1896,7 +1903,7 @@ static void emit_decls( struct ureg_program *ureg )
                          ureg->system_value[i].semantic_name,
                          ureg->system_value[i].semantic_index,
                          0,
-                         TGSI_WRITEMASK_XYZW, 0);
+                         TGSI_WRITEMASK_XYZW, 0, FALSE);
    }
 
    if (ureg->supports_any_inout_decl_range) {
@@ -1909,7 +1916,8 @@ static void emit_decls( struct ureg_program *ureg )
                             ureg->output[i].semantic_index,
                             ureg->output[i].streams,
                             ureg->output[i].usage_mask,
-                            ureg->output[i].array_id);
+                            ureg->output[i].array_id,
+                            ureg->output[i].invariant);
       }
    }
    else {
@@ -1922,7 +1930,9 @@ static void emit_decls( struct ureg_program *ureg )
                                ureg->output[i].semantic_index +
                                (j - ureg->output[i].first),
                                ureg->output[i].streams,
-                               ureg->output[i].usage_mask, 0);
+                               ureg->output[i].usage_mask,
+                               0,
+                               ureg->output[i].invariant);
          }
       }
    }
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.h b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
index ac46da55080..4d4a954529b 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
@@ -79,6 +79,7 @@ struct ureg_dst
    unsigned DimIndirect     : 1;  /* BOOL */
    unsigned Dimension       : 1;  /* BOOL */
    unsigned Saturate        : 1;  /* BOOL */
+   unsigned Invariant       : 1;  /* BOOL */
    int      Index           : 16; /* SINT */
    int      IndirectIndex   : 16; /* SINT */
    unsigned IndirectFile    : 4;  /* TGSI_FILE_ */
@@ -250,7 +251,8 @@ ureg_DECL_output_layout(struct ureg_program *,
                         unsigned index,
                         unsigned usage_mask,
                         unsigned array_id,
-                        unsigned array_size);
+                        unsigned array_size,
+                        boolean invariant);
 
 struct ureg_dst
 ureg_DECL_output_masked(struct ureg_program *,