Mesa (master): i965: Add support for dereferencing structs to the new FS backend.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: ba481f2046e6427c8bd7fc5f8cb8ef3059a7881a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ba481f2046e6427c8bd7fc5f8cb8ef3059a7881a

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Sep 27 22:26:22 2010 -0700

i965: Add support for dereferencing structs to the new FS backend.

Fixes: glsl1-struct(2)

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |   67 ++++++++++++++++------------------
 1 files changed, 32 insertions(+), 35 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 3b56340..4f88ca1 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -499,42 +499,42 @@ fs_reg::fs_reg(enum register_file file, int hw_reg)
    this->type = BRW_REGISTER_TYPE_F;
 }
 
-/** Automatic reg constructor. */
-fs_reg::fs_reg(class fs_visitor *v, const struct glsl_type *type)
+int
+brw_type_for_base_type(const struct glsl_type *type)
 {
-   init();
-
-   this->file = GRF;
-   this->reg = v->next_abstract_grf;
-   this->reg_offset = 0;
-   v->next_abstract_grf += type_size(type);
-
    switch (type->base_type) {
    case GLSL_TYPE_FLOAT:
-      this->type = BRW_REGISTER_TYPE_F;
-      break;
+      return BRW_REGISTER_TYPE_F;
    case GLSL_TYPE_INT:
    case GLSL_TYPE_BOOL:
-      this->type = BRW_REGISTER_TYPE_D;
-      break;
+      return BRW_REGISTER_TYPE_D;
    case GLSL_TYPE_UINT:
-      this->type = BRW_REGISTER_TYPE_UD;
-      break;
+      return BRW_REGISTER_TYPE_UD;
    case GLSL_TYPE_ARRAY:
    case GLSL_TYPE_STRUCT:
       /* These should be overridden with the type of the member when
        * dereferenced into.  BRW_REGISTER_TYPE_UD seems like a likely
        * way to trip up if we don't.
        */
-      this->type =  BRW_REGISTER_TYPE_UD;
-      break;
+      return BRW_REGISTER_TYPE_UD;
    default:
       assert(!"not reached");
-      this->type =  BRW_REGISTER_TYPE_F;
-      break;
+      return BRW_REGISTER_TYPE_F;
    }
 }
 
+/** Automatic reg constructor. */
+fs_reg::fs_reg(class fs_visitor *v, const struct glsl_type *type)
+{
+   init();
+
+   this->file = GRF;
+   this->reg = v->next_abstract_grf;
+   this->reg_offset = 0;
+   v->next_abstract_grf += type_size(type);
+   this->type = brw_type_for_base_type(type);
+}
+
 fs_reg *
 fs_visitor::variable_storage(ir_variable *var)
 {
@@ -597,7 +597,18 @@ fs_visitor::visit(ir_dereference_variable *ir)
 void
 fs_visitor::visit(ir_dereference_record *ir)
 {
-   assert(!"FINISHME");
+   const glsl_type *struct_type = ir->record->type;
+
+   ir->record->accept(this);
+
+   unsigned int offset = 0;
+   for (unsigned int i = 0; i < struct_type->length; i++) {
+      if (strcmp(struct_type->fields.structure[i].name, ir->field) == 0)
+	 break;
+      offset += type_size(struct_type->fields.structure[i].type);
+   }
+   this->result.reg_offset += offset;
+   this->result.type = brw_type_for_base_type(ir->type);
 }
 
 void
@@ -613,21 +624,7 @@ fs_visitor::visit(ir_dereference_array *ir)
       element_size = ir->type->vector_elements;
    } else {
       element_size = type_size(ir->type);
-      switch (ir->type->base_type) {
-      case GLSL_TYPE_UINT:
-	 this->result.type = BRW_REGISTER_TYPE_UD;
-	 break;
-      case GLSL_TYPE_INT:
-      case GLSL_TYPE_BOOL:
-	 this->result.type = BRW_REGISTER_TYPE_D;
-	 break;
-      case GLSL_TYPE_FLOAT:
-	 this->result.type = BRW_REGISTER_TYPE_F;
-	 break;
-      default:
-	 /* deref producing struct, no need to tweak type yet. */
-	 break;
-      }
+      this->result.type = brw_type_for_base_type(ir->type);
    }
 
    if (index) {