1/**************************************************************************
2 *
3 * Copyright 2009-2010 VMware, Inc.  All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
15 * of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
20 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
21 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 *
25 **************************************************************************/
26
27/**
28 * @file
29 * Framebuffer utility functions.
30 *
31 * @author Brian Paul
32 */
33
34
35#include "pipe/p_screen.h"
36#include "pipe/p_state.h"
37#include "pipe/p_defines.h"
38#include "util/u_inlines.h"
39
40#include "util/u_memory.h"
41#include "util/u_framebuffer.h"
42
43
44/**
45 * Compare pipe_framebuffer_state objects.
46 * \return TRUE if same, FALSE if different
47 */
48boolean
49util_framebuffer_state_equal(const struct pipe_framebuffer_state *dst,
50                             const struct pipe_framebuffer_state *src)
51{
52   unsigned i;
53
54   if (dst->width != src->width ||
55       dst->height != src->height)
56      return FALSE;
57
58   for (i = 0; i < Elements(src->cbufs); i++) {
59      if (dst->cbufs[i] != src->cbufs[i]) {
60         return FALSE;
61      }
62   }
63
64   if (dst->nr_cbufs != src->nr_cbufs) {
65      return FALSE;
66   }
67
68   if (dst->zsbuf != src->zsbuf) {
69      return FALSE;
70   }
71
72   return TRUE;
73}
74
75
76/**
77 * Copy framebuffer state from src to dst, updating refcounts.
78 */
79void
80util_copy_framebuffer_state(struct pipe_framebuffer_state *dst,
81                            const struct pipe_framebuffer_state *src)
82{
83   unsigned i;
84
85   dst->width = src->width;
86   dst->height = src->height;
87
88   for (i = 0; i < src->nr_cbufs; i++)
89      pipe_surface_reference(&dst->cbufs[i], src->cbufs[i]);
90
91   for (i = src->nr_cbufs; i < dst->nr_cbufs; i++)
92      pipe_surface_reference(&dst->cbufs[i], NULL);
93
94   dst->nr_cbufs = src->nr_cbufs;
95
96   pipe_surface_reference(&dst->zsbuf, src->zsbuf);
97}
98
99
100void
101util_unreference_framebuffer_state(struct pipe_framebuffer_state *fb)
102{
103   unsigned i;
104
105   for (i = 0; i < fb->nr_cbufs; i++) {
106      pipe_surface_reference(&fb->cbufs[i], NULL);
107   }
108
109   pipe_surface_reference(&fb->zsbuf, NULL);
110
111   fb->width = fb->height = 0;
112   fb->nr_cbufs = 0;
113}
114
115
116/* Where multiple sizes are allowed for framebuffer surfaces, find the
117 * minimum width and height of all bound surfaces.
118 */
119boolean
120util_framebuffer_min_size(const struct pipe_framebuffer_state *fb,
121                          unsigned *width,
122                          unsigned *height)
123{
124   unsigned w = ~0;
125   unsigned h = ~0;
126   unsigned i;
127
128   for (i = 0; i < fb->nr_cbufs; i++) {
129      w = MIN2(w, fb->cbufs[i]->width);
130      h = MIN2(h, fb->cbufs[i]->height);
131   }
132
133   if (fb->zsbuf) {
134      w = MIN2(w, fb->zsbuf->width);
135      h = MIN2(h, fb->zsbuf->height);
136   }
137
138   if (w == ~0) {
139      *width = 0;
140      *height = 0;
141      return FALSE;
142   }
143   else {
144      *width = w;
145      *height = h;
146      return TRUE;
147   }
148}
149