workbench/libs/mesa/src/gallium/auxiliary/util/u_framebuffer.c

   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
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   8  * without limitation the rights to use, copy, modify, merge, publish,
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  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
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  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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  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
  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
  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
 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
 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 }