[PATCH] wined3d: Check if destination texture is FBO attachable in glsl_blitter_supported().

[Paul Gofman]

If the destination texture is not FBO attachable GLSL blitter does not work
for it unless backbuffer is used as offscreen rendering mode.

Related to bug https://bugs.winehq.org/show_bug.cgi?id=47121, while that is
a Staging bug (without a staging patch, the GLSL blitter is avoided for that
textures regardless).

Signed-off-by: Paul Gofman 
---
 dlls/wined3d/glsl_shader.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index 47eb6f2b79..6493e7f16c 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -13193,6 +13193,14 @@ static BOOL glsl_blitter_supported(enum wined3d_blit_op blit_op, const struct wi
         return FALSE;
     }

+    if (wined3d_settings.offscreen_rendering_mode == ORM_FBO
+            && !((dst_format->flags[WINED3D_GL_RES_TYPE_TEX_2D] & WINED3DFMT_FLAG_FBO_ATTACHABLE)
+            || (dst_resource->bind_flags & WINED3D_BIND_RENDER_TARGET)))
+    {
+        TRACE("Destination texture is not FBO attachable.\n");
+        return FALSE;
+    }
+
     TRACE("Returning supported.\n");
     return TRUE;
 }