1/**************************************************************************
2 *
3 * Copyright 2009 VMware, Inc.
4 * All Rights Reserved.
5 *
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:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
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.
25 *
26 **************************************************************************/
27
28#include "main/glheader.h"
29#include "st_context.h"
30#include "st_cb_viewport.h"
31
32#include "pipe/p_state.h"
33#include "pipe/p_defines.h"
34#include "util/u_atomic.h"
35
36/**
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.
41 */
42static INLINE struct st_framebuffer *
43st_ws_framebuffer(struct gl_framebuffer *fb)
44{
45   /* FBO cannot be casted.  See st_new_framebuffer */
46   if (fb && _mesa_is_winsys_fbo(fb))
47      return (struct st_framebuffer *) fb;
48   return NULL;
49}
50
51static void st_viewport(struct gl_context * ctx, GLint x, GLint y,
52                        GLsizei width, GLsizei height)
53{
54   struct st_context *st = ctx->st;
55   struct st_framebuffer *stdraw;
56   struct st_framebuffer *stread;
57
58   if (!st->invalidate_on_gl_viewport)
59      return;
60
61   /*
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.
66    */
67
68   stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
69   stread = st_ws_framebuffer(st->ctx->ReadBuffer);
70
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;
75}
76
77void st_init_viewport_functions(struct dd_function_table *functions)
78{
79   functions->Viewport = st_viewport;
80}
81