From 90cdb8a4de3cbbc7c87779f978be2f846cf7c07c Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sat, 1 Nov 2008 16:02:32 -0600
Subject: [PATCH] mesa: fix assignment / parameter passing of sampler types

---
 src/mesa/shader/slang/slang_codegen.c  | 10 +++++++---
 src/mesa/shader/slang/slang_emit.c     |  8 ++++++++
 src/mesa/shader/slang/slang_vartable.c | 15 ++++++++++++++-
 3 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index b412741..d8a92e2 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -2439,8 +2439,6 @@ _slang_gen_var_decl(slang_assemble_ctx *A, slang_variable *var)
    /*assert(!var->declared);*/
    var->declared = GL_TRUE;
 
-   assert(!is_sampler_type(&var->type));
-
    n = new_node0(IR_VAR_DECL);
    if (n) {
       _slang_attach_storage(n, var);
@@ -2449,7 +2447,13 @@ _slang_gen_var_decl(slang_assemble_ctx *A, slang_variable *var)
       assert(n->Store);
       assert(n->Store->Index < 0);
 
-      n->Store->File = PROGRAM_TEMPORARY;
+      if (is_sampler_type(&var->type)) {
+         n->Store->File = PROGRAM_SAMPLER;
+      }
+      else {
+         n->Store->File = PROGRAM_TEMPORARY;
+      }
+
       n->Store->Size = _slang_sizeof_type_specifier(&n->Var->type.specifier);
 
       if (n->Store->Size <= 0) {
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index 9e8daa1..010b558 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -1085,6 +1085,14 @@ emit_copy(slang_emit_info *emitInfo, slang_ir_node *n)
 
    n->Store = n->Children[0]->Store;
 
+   if (n->Store->File == PROGRAM_SAMPLER) {
+      /* no code generated for sampler assignments,
+       * just copy the sampler index at compile time.
+       */
+      n->Store->Index = n->Children[1]->Store->Index;
+      return NULL;
+   }
+
 #if PEEPHOLE_OPTIMIZATIONS
    if (inst &&
        _slang_is_temp(emitInfo->vt, n->Children[1]->Store) &&
diff --git a/src/mesa/shader/slang/slang_vartable.c b/src/mesa/shader/slang/slang_vartable.c
index 9b607e6..95971a7 100644
--- a/src/mesa/shader/slang/slang_vartable.c
+++ b/src/mesa/shader/slang/slang_vartable.c
@@ -115,6 +115,11 @@ _slang_pop_var_table(slang_var_table *vt)
                       store->Index,
                       _mesa_swizzle_string(store->Swizzle, 0, 0));
 
+      if (store->File == PROGRAM_SAMPLER) {
+         /* samplers have no storage */
+         continue;
+      }
+
       if (store->Size == 1)
          comp = GET_SWZ(store->Swizzle, 0);
       else
@@ -241,7 +246,15 @@ GLboolean
 _slang_alloc_var(slang_var_table *vt, slang_ir_storage *store)
 {
    struct table *t = vt->Top;
-   const int i = alloc_reg(vt, store->Size, GL_FALSE);
+   int i;
+
+   if (store->File == PROGRAM_SAMPLER) {
+      /* don't really allocate storage */
+      store->Index = 0;
+      return GL_TRUE;
+   }
+
+   i = alloc_reg(vt, store->Size, GL_FALSE);
    if (i < 0)
       return GL_FALSE;
 
-- 
2.7.4