From 6951870e5790a4b563bfa3b943ed338f9c5922ac Mon Sep 17 00:00:00 2001
From: Bryan Cain <bryancain3@gmail.com>
Date: Mon, 2 Jan 2012 14:48:47 -0600
Subject: [PATCH] gallium: add support for clip distances

---
 src/gallium/auxiliary/tgsi/tgsi_strings.c  |  3 +-
 src/gallium/auxiliary/tgsi/tgsi_ureg.c     | 38 +++++++++++++++++-----
 src/gallium/auxiliary/tgsi/tgsi_ureg.h     |  6 ++++
 src/gallium/include/pipe/p_shader_tokens.h |  3 +-
 4 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index ee4ce080cbe..9516095bd8b 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -70,7 +70,8 @@ const char *tgsi_semantic_names[TGSI_SEMANTIC_COUNT] =
    "PRIM_ID",
    "INSTANCEID",
    "VERTEXID",
-   "STENCIL"
+   "STENCIL",
+   "CLIPDIST"
 };
 
 const char *tgsi_texture_names[TGSI_TEXTURE_COUNT] =
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.c b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
index 17f9ce25227..0f9aa3ab43a 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
@@ -122,6 +122,7 @@ struct ureg_program
    struct {
       unsigned semantic_name;
       unsigned semantic_index;
+      unsigned usage_mask; /* = TGSI_WRITEMASK_* */
    } output[UREG_MAX_OUTPUT];
    unsigned nr_outputs;
 
@@ -396,21 +397,27 @@ ureg_DECL_system_value(struct ureg_program *ureg,
 
 
 struct ureg_dst 
-ureg_DECL_output( struct ureg_program *ureg,
-                  unsigned name,
-                  unsigned index )
+ureg_DECL_output_masked( struct ureg_program *ureg,
+                         unsigned name,
+                         unsigned index,
+                         unsigned usage_mask )
 {
    unsigned i;
 
+   assert(usage_mask != 0);
+
    for (i = 0; i < ureg->nr_outputs; i++) {
       if (ureg->output[i].semantic_name == name &&
-          ureg->output[i].semantic_index == index) 
+          ureg->output[i].semantic_index == index) { 
+         ureg->output[i].usage_mask |= usage_mask;
          goto out;
+      }
    }
 
    if (ureg->nr_outputs < UREG_MAX_OUTPUT) {
       ureg->output[i].semantic_name = name;
       ureg->output[i].semantic_index = index;
+      ureg->output[i].usage_mask = usage_mask;
       ureg->nr_outputs++;
    }
    else {
@@ -422,6 +429,15 @@ out:
 }
 
 
+struct ureg_dst 
+ureg_DECL_output( struct ureg_program *ureg,
+                  unsigned name,
+                  unsigned index )
+{
+   return ureg_DECL_output_masked(ureg, name, index, TGSI_WRITEMASK_XYZW);
+}
+
+
 /* Returns a new constant register.  Keep track of which have been
  * referred to so that we can emit decls later.
  *
@@ -1181,7 +1197,8 @@ emit_decl_semantic(struct ureg_program *ureg,
                    unsigned file,
                    unsigned index,
                    unsigned semantic_name,
-                   unsigned semantic_index)
+                   unsigned semantic_index,
+                   unsigned usage_mask)
 {
    union tgsi_any_token *out = get_tokens(ureg, DOMAIN_DECL, 3);
 
@@ -1189,7 +1206,7 @@ emit_decl_semantic(struct ureg_program *ureg,
    out[0].decl.Type = TGSI_TOKEN_TYPE_DECLARATION;
    out[0].decl.NrTokens = 3;
    out[0].decl.File = file;
-   out[0].decl.UsageMask = TGSI_WRITEMASK_XYZW; /* FIXME! */
+   out[0].decl.UsageMask = usage_mask;
    out[0].decl.Semantic = 1;
 
    out[1].value = 0;
@@ -1427,7 +1444,8 @@ static void emit_decls( struct ureg_program *ureg )
                             TGSI_FILE_INPUT,
                             ureg->gs_input[i].index,
                             ureg->gs_input[i].semantic_name,
-                            ureg->gs_input[i].semantic_index);
+                            ureg->gs_input[i].semantic_index,
+                            TGSI_WRITEMASK_XYZW);
       }
    }
 
@@ -1436,7 +1454,8 @@ static void emit_decls( struct ureg_program *ureg )
                          TGSI_FILE_SYSTEM_VALUE,
                          ureg->system_value[i].index,
                          ureg->system_value[i].semantic_name,
-                         ureg->system_value[i].semantic_index);
+                         ureg->system_value[i].semantic_index,
+                         TGSI_WRITEMASK_XYZW);
    }
 
    for (i = 0; i < ureg->nr_outputs; i++) {
@@ -1444,7 +1463,8 @@ static void emit_decls( struct ureg_program *ureg )
                          TGSI_FILE_OUTPUT,
                          i,
                          ureg->output[i].semantic_name,
-                         ureg->output[i].semantic_index);
+                         ureg->output[i].semantic_index,
+                         ureg->output[i].usage_mask);
    }
 
    for (i = 0; i < ureg->nr_samplers; i++) {
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.h b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
index bf55d54e543..07ab8cba0ba 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
@@ -228,6 +228,12 @@ ureg_DECL_system_value(struct ureg_program *,
                        unsigned semantic_name,
                        unsigned semantic_index);
 
+struct ureg_dst
+ureg_DECL_output_masked( struct ureg_program *,
+                         unsigned semantic_name,
+                         unsigned semantic_index,
+                         unsigned usage_mask );
+
 struct ureg_dst
 ureg_DECL_output( struct ureg_program *,
                   unsigned semantic_name,
diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h
index 10cfaf69ade..330e0ba74cd 100644
--- a/src/gallium/include/pipe/p_shader_tokens.h
+++ b/src/gallium/include/pipe/p_shader_tokens.h
@@ -146,7 +146,8 @@ struct tgsi_declaration_dimension
 #define TGSI_SEMANTIC_INSTANCEID 10
 #define TGSI_SEMANTIC_VERTEXID   11
 #define TGSI_SEMANTIC_STENCIL    12
-#define TGSI_SEMANTIC_COUNT      13 /**< number of semantic values */
+#define TGSI_SEMANTIC_CLIPDIST   13
+#define TGSI_SEMANTIC_COUNT      14 /**< number of semantic values */
 
 struct tgsi_declaration_semantic
 {
-- 
2.30.2