st/mesa: redefine mapping from VARYING_SLOT_TEXi/PNTC/VARi to TGSI GENERIC[i]

Generic varyings in TGSI were based on the value of VARYING_SLOT_TEX0, so VAR0
was always GENERIC[22] (with tessellation patches). Some drivers might not
be able to cope with that.

This commit defines a proper mapping, so that PNTC is GENERIC[8] and VAR0 is
GENERIC[9].

Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 25 insertions, 21 deletions

diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index fbf8930..926086b 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -275,17 +275,18 @@ st_prepare_vertex_program(struct gl_context *ctx,
          case VARYING_SLOT_TEX5:
          case VARYING_SLOT_TEX6:
          case VARYING_SLOT_TEX7:
-            stvp->output_semantic_name[slot] = st->needs_texcoord_semantic ?
-               TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC;
-            stvp->output_semantic_index[slot] = attr - VARYING_SLOT_TEX0;
-            break;
-
+            if (st->needs_texcoord_semantic) {
+               stvp->output_semantic_name[slot] = TGSI_SEMANTIC_TEXCOORD;
+               stvp->output_semantic_index[slot] = attr - VARYING_SLOT_TEX0;
+               break;
+            }
+            /* fall through */
          case VARYING_SLOT_VAR0:
          default:
             assert(attr < VARYING_SLOT_MAX);
             stvp->output_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
-            stvp->output_semantic_index[slot] = st->needs_texcoord_semantic ?
-               (attr - VARYING_SLOT_VAR0) : (attr - VARYING_SLOT_TEX0);
+            stvp->output_semantic_index[slot] =
+               st_get_generic_varying_index(st, attr);
             break;
          }
       }
@@ -655,9 +656,8 @@ st_translate_fragment_program(struct st_context *st,
              * the user varyings on VAR0.  Otherwise, we use TEX0 as base index.
              */
             assert(attr >= VARYING_SLOT_TEX0);
-            input_semantic_index[slot] = st->needs_texcoord_semantic ?
-               (attr - VARYING_SLOT_VAR0) : (attr - VARYING_SLOT_TEX0);
             input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
+            input_semantic_index[slot] = st_get_generic_varying_index(st, attr);
             if (attr == VARYING_SLOT_PNTC)
                interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
             else
@@ -974,16 +974,18 @@ st_translate_geometry_program(struct st_context *st,
          case VARYING_SLOT_TEX5:
          case VARYING_SLOT_TEX6:
          case VARYING_SLOT_TEX7:
-            stgp->input_semantic_name[slot] = st->needs_texcoord_semantic ?
-               TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC;
-            stgp->input_semantic_index[slot] = (attr - VARYING_SLOT_TEX0);
-            break;
+            if (st->needs_texcoord_semantic) {
+               stgp->input_semantic_name[slot] = TGSI_SEMANTIC_TEXCOORD;
+               stgp->input_semantic_index[slot] = attr - VARYING_SLOT_TEX0;
+               break;
+            }
+            /* fall through */
          case VARYING_SLOT_VAR0:
          default:
             assert(attr >= VARYING_SLOT_VAR0 && attr < VARYING_SLOT_MAX);
             stgp->input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
-            stgp->input_semantic_index[slot] = st->needs_texcoord_semantic ?
-               (attr - VARYING_SLOT_VAR0) : (attr - VARYING_SLOT_TEX0);
+            stgp->input_semantic_index[slot] =
+               st_get_generic_varying_index(st, attr);
          break;
          }
       }
@@ -1069,17 +1071,19 @@ st_translate_geometry_program(struct st_context *st,
          case VARYING_SLOT_TEX5:
          case VARYING_SLOT_TEX6:
          case VARYING_SLOT_TEX7:
-            gs_output_semantic_name[slot] = st->needs_texcoord_semantic ?
-               TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC;
-            gs_output_semantic_index[slot] = (attr - VARYING_SLOT_TEX0);
-            break;
+            if (st->needs_texcoord_semantic) {
+               gs_output_semantic_name[slot] = TGSI_SEMANTIC_TEXCOORD;
+               gs_output_semantic_index[slot] = attr - VARYING_SLOT_TEX0;
+               break;
+            }
+            /* fall through */
          case VARYING_SLOT_VAR0:
          default:
             assert(slot < Elements(gs_output_semantic_name));
             assert(attr >= VARYING_SLOT_VAR0);
             gs_output_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
-            gs_output_semantic_index[slot] = st->needs_texcoord_semantic ?
-               (attr - VARYING_SLOT_VAR0) : (attr - VARYING_SLOT_TEX0);
+            gs_output_semantic_index[slot] =
+               st_get_generic_varying_index(st, attr);
          break;
          }
       }