From ae0ff8097b85d3537a7be1674d55a44a9bd6018e Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 19 Nov 2008 14:12:25 -0700
Subject: mesa: rework GLSL array code generation

We now express arrays in terms of indirect addressing.  For example:
  dst = a[i];
becomes:
  MOV dst, TEMP[1 + TEMP[2].y];
At instruction-emit time indirect addressing is converted into ARL/
ADDR-relative form:
  ARL ADDR.x, TEMP[2].y;
  MOV dst, TEMP[1 + ADDR.x];
This fixes a number of array-related issues.  Arrays of arrays and complex
array/struct nesting works now.
There may be some regressions, but more work is coming.
---
 src/mesa/shader/slang/slang_ir.c | 50 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'src/mesa/shader/slang/slang_ir.c')

diff --git a/src/mesa/shader/slang/slang_ir.c b/src/mesa/shader/slang/slang_ir.c
index 4fe3a2b85d..c33c80da99 100644
--- a/src/mesa/shader/slang/slang_ir.c
+++ b/src/mesa/shader/slang/slang_ir.c
@@ -116,6 +116,20 @@ _slang_ir_info(slang_ir_opcode opcode)
 }
 
 
+void
+_slang_init_ir_storage(slang_ir_storage *st,
+                       enum register_file file, GLint index, GLint size,
+                       GLuint swizzle)
+{
+   st->File = file;
+   st->Index = index;
+   st->Size = size;
+   st->Swizzle = swizzle;
+   st->Parent = NULL;
+   st->IsIndirect = GL_FALSE;
+}
+
+
 /**
  * Return a new slang_ir_storage object.
  */
@@ -130,6 +144,7 @@ _slang_new_ir_storage(enum register_file file, GLint index, GLint size)
       st->Size = size;
       st->Swizzle = SWIZZLE_NOOP;
       st->Parent = NULL;
+      st->IsIndirect = GL_FALSE;
    }
    return st;
 }
@@ -150,6 +165,7 @@ _slang_new_ir_storage_swz(enum register_file file, GLint index, GLint size,
       st->Size = size;
       st->Swizzle = swizzle;
       st->Parent = NULL;
+      st->IsIndirect = GL_FALSE;
    }
    return st;
 }
@@ -170,11 +186,45 @@ _slang_new_ir_storage_relative(GLint index, GLint size,
       st->Size = size;
       st->Swizzle = SWIZZLE_NOOP;
       st->Parent = parent;
+      st->IsIndirect = GL_FALSE;
+   }
+   return st;
+}
+
+
+slang_ir_storage *
+_slang_new_ir_storage_indirect(enum register_file file,
+                               GLint index,
+                               GLint size,
+                               enum register_file indirectFile,
+                               GLint indirectIndex,
+                               GLuint indirectSwizzle)
+{
+   slang_ir_storage *st;
+   st = (slang_ir_storage *) _slang_alloc(sizeof(slang_ir_storage));
+   if (st) {
+      st->File = file;
+      st->Index = index;
+      st->Size = size;
+      st->Swizzle = SWIZZLE_NOOP;
+      st->IsIndirect = GL_TRUE;
+      st->IndirectFile = indirectFile;
+      st->IndirectIndex = indirectIndex;
+      st->IndirectSwizzle = indirectSwizzle;
    }
    return st;
 }
 
 
+/* XXX temporary function */
+void
+_slang_copy_ir_storage(slang_ir_storage *dst, const slang_ir_storage *src)
+{
+   *dst = *src;
+   dst->Parent = NULL;
+}
+
+
 
 static const char *
 _slang_ir_name(slang_ir_opcode opcode)
-- 
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