[Mesa-dev] [PATCH 5/6] mesa: don't set dirty matrix flag if re-loading identity matrix

[Brian Paul]

---
 src/mesa/main/matrix.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/matrix.c b/src/mesa/main/matrix.c
index 80c8a24..5ac97f8 100644
--- a/src/mesa/main/matrix.c
+++ b/src/mesa/main/matrix.c
@@ -309,8 +309,10 @@ _mesa_LoadIdentity( void )
    if (MESA_VERBOSE & VERBOSE_API)
       _mesa_debug(ctx, "glLoadIdentity()\n");
 
-   _math_matrix_set_identity( ctx->CurrentStack->Top );
-   ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+   if (_math_matrix_set_identity(ctx->CurrentStack->Top)) {
+      /* the matrix was not an identity before */
+      ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+   }
 }
 
 
-- 
1.9.1

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