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