Rico Schüller : d3dx9: Improve is_valid_constant().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 12788436430dcf5ba6a89f0505be16c016abf52d
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=12788436430dcf5ba6a89f0505...

Author: Rico Schüller 
Date:   Thu Aug 23 21:36:58 2012 +0200

d3dx9: Improve is_valid_constant().

---

dlls/d3dx9_36/shader.c |   28 +++++++++++++++++++++++++++-
 1 files changed, 27 insertions(+), 1 deletions(-)

diff --git a/dlls/d3dx9_36/shader.c b/dlls/d3dx9_36/shader.c
index 69bb40e..c761aef 100644
--- a/dlls/d3dx9_36/shader.c
+++ b/dlls/d3dx9_36/shader.c
@@ -690,6 +690,28 @@ static inline D3DXHANDLE handle_from_constant(struct ctab_constant *constant)
     return (D3DXHANDLE)constant;
 }

+static struct ctab_constant *is_valid_sub_constant(struct ctab_constant *parent, struct ctab_constant *constant)
+{
+    UINT i, count;
+
+    /* all variable have at least elements = 1, but no elements */
+    if (!parent->constants) return NULL;
+
+    if (parent->desc.Elements > 1) count = parent->desc.Elements;
+    else count = parent->desc.StructMembers;
+
+    for (i = 0; i < count; ++i)
+    {
+        if (&parent->constants[i] == constant)
+            return constant;
+
+        if (is_valid_sub_constant(&parent->constants[i], constant))
+            return constant;
+    }
+
+    return NULL;
+}
+
 static inline struct ctab_constant *is_valid_constant(struct ID3DXConstantTableImpl *table, D3DXHANDLE handle)
 {
     struct ctab_constant *c = constant_from_handle(handle);
@@ -699,7 +721,11 @@ static inline struct ctab_constant *is_valid_constant(struct ID3DXConstantTableI

for (i = 0; i < table->desc.Constants; ++i)
     {
-        if (&table->constants[i] == c) return c;
+        if (&table->constants[i] == c)
+            return c;
+
+        if (is_valid_sub_constant(&table->constants[i], c))
+            return c;
     }

return NULL;