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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   */
48  boolean
util_framebuffer_state_equal(const struct pipe_framebuffer_state * dst,const struct pipe_framebuffer_state * src)49  util_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   */
79  void
util_copy_framebuffer_state(struct pipe_framebuffer_state * dst,const struct pipe_framebuffer_state * src)80  util_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  
100  void
util_unreference_framebuffer_state(struct pipe_framebuffer_state * fb)101  util_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   */
119  boolean
util_framebuffer_min_size(const struct pipe_framebuffer_state * fb,unsigned * width,unsigned * height)120  util_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