[Mesa-dev] [PATCH 08/16 v2] st/nine: Change x86 FPU Control word on device creation

[Axel Davy]

From: Tiziano Bacocco <tizbac2 at gmail.com>

As on wined3d and windows, when D3DCREATE_FPU_PRESERVE is not
specified, change the fpu control word to all exceptions masked,
single precision, round to nearest.

Signed-off-by: Axel Davy <axel.davy at ens.fr>
Signed-off-by: Tiziano Bacocco <tizbac2 at gmail.com>
---
 src/gallium/state_trackers/nine/device9.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/src/gallium/state_trackers/nine/device9.c b/src/gallium/state_trackers/nine/device9.c
index 1a776a7..0bd1717 100644
--- a/src/gallium/state_trackers/nine/device9.c
+++ b/src/gallium/state_trackers/nine/device9.c
@@ -41,6 +41,7 @@
 
 #include "pipe/p_screen.h"
 #include "pipe/p_context.h"
+#include "pipe/p_config.h"
 #include "util/u_math.h"
 #include "util/u_inlines.h"
 #include "util/u_hash_table.h"
@@ -53,6 +54,33 @@
 
 #define DBG_CHANNEL DBG_DEVICE
 
+#if defined(PIPE_CC_GCC) && (defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64))
+
+#include <fpu_control.h>
+
+static void nine_setup_fpu()
+{
+    fpu_control_t c;
+
+    _FPU_GETCW(c);
+    /* clear the control word */
+    c &= _FPU_RESERVED;
+    /* d3d9 doc/wine tests: mask all exceptions, use single-precision
+     * and round to nearest */
+    c |= _FPU_MASK_IM | _FPU_MASK_DM | _FPU_MASK_ZM | _FPU_MASK_OM |
+         _FPU_MASK_UM | _FPU_MASK_PM | _FPU_SINGLE | _FPU_RC_NEAREST;
+    _FPU_SETCW(c);
+}
+
+#else
+
+static void nine_setup_fpu(void)
+{
+    WARN_ONCE("FPU setup not supported on non-x86 platforms\n");
+}
+
+#endif
+
 static void
 NineDevice9_SetDefaultState( struct NineDevice9 *This, boolean is_reset )
 {
@@ -168,6 +196,9 @@ NineDevice9_ctor( struct NineDevice9 *This,
     IDirect3D9_AddRef(This->d3d9);
     ID3DPresentGroup_AddRef(This->present);
 
+    if (!(This->params.BehaviorFlags & D3DCREATE_FPU_PRESERVE))
+        nine_setup_fpu();
+
     This->pipe = This->screen->context_create(This->screen, NULL);
     if (!This->pipe) { return E_OUTOFMEMORY; } /* guess */
 
-- 
2.1.0