1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 #include "main/glheader.h"
29 #include "st_context.h"
30 #include "st_cb_viewport.h"
32 #include "pipe/p_state.h"
33 #include "pipe/p_defines.h"
34 #include "util/u_atomic.h"
37 * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
38 * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
39 * We'll only return non-null for window system framebuffers.
40 * Note that this function may fail.
42 static INLINE
struct st_framebuffer
*
43 st_ws_framebuffer(struct gl_framebuffer
*fb
)
45 /* FBO cannot be casted. See st_new_framebuffer */
46 if (fb
&& _mesa_is_winsys_fbo(fb
))
47 return (struct st_framebuffer
*) fb
;
51 static void st_viewport(struct gl_context
* ctx
, GLint x
, GLint y
,
52 GLsizei width
, GLsizei height
)
54 struct st_context
*st
= ctx
->st
;
55 struct st_framebuffer
*stdraw
;
56 struct st_framebuffer
*stread
;
58 if (!st
->invalidate_on_gl_viewport
)
62 * Normally we'd want the state tracker manager to mark the drawables
63 * invalid only when needed. This will force the state tracker manager
64 * to revalidate the drawable, rather than just update the context with
65 * the latest cached drawable info.
68 stdraw
= st_ws_framebuffer(st
->ctx
->DrawBuffer
);
69 stread
= st_ws_framebuffer(st
->ctx
->ReadBuffer
);
71 if (stdraw
&& stdraw
->iface
)
72 stdraw
->iface_stamp
= p_atomic_read(&stdraw
->iface
->stamp
) - 1;
73 if (stread
&& stread
!= stdraw
&& stread
->iface
)
74 stread
->iface_stamp
= p_atomic_read(&stread
->iface
->stamp
) - 1;
77 void st_init_viewport_functions(struct dd_function_table
*functions
)
79 functions
->Viewport
= st_viewport
;