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
   7  * "Software"), to deal in the Software without restriction, including
   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
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  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
  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    /* Set remaining dest cbuf pointers to NULL */
  92    for ( ; i < Elements(dst->cbufs); i++)
  93       pipe_surface_reference(&dst->cbufs[i], NULL);
  94
  95    dst->nr_cbufs = src->nr_cbufs;
  96
  97    pipe_surface_reference(&dst->zsbuf, src->zsbuf);
  98 }
  99
 100
 101 void
 102 util_unreference_framebuffer_state(struct pipe_framebuffer_state *fb)
 103 {
 104    unsigned i;
 105
 106    for (i = 0; i < fb->nr_cbufs; i++) {
 107       pipe_surface_reference(&fb->cbufs[i], NULL);
 108    }
 109
 110    pipe_surface_reference(&fb->zsbuf, NULL);
 111
 112    fb->width = fb->height = 0;
 113    fb->nr_cbufs = 0;
 114 }
 115
 116
 117 /* Where multiple sizes are allowed for framebuffer surfaces, find the
 118  * minimum width and height of all bound surfaces.
 119  */
 120 boolean
 121 util_framebuffer_min_size(const struct pipe_framebuffer_state *fb,
 122                           unsigned *width,
 123                           unsigned *height)
 124 {
 125    unsigned w = ~0;
 126    unsigned h = ~0;
 127    unsigned i;
 128
 129    for (i = 0; i < fb->nr_cbufs; i++) {
 130       if (!fb->cbufs[i])
 131          continue;
 132
 133       w = MIN2(w, fb->cbufs[i]->width);
 134       h = MIN2(h, fb->cbufs[i]->height);
 135    }
 136
 137    if (fb->zsbuf) {
 138       w = MIN2(w, fb->zsbuf->width);
 139       h = MIN2(h, fb->zsbuf->height);
 140    }
 141
 142    if (w == ~0) {
 143       *width = 0;
 144       *height = 0;
 145       return FALSE;
 146    }
 147    else {
 148       *width = w;
 149       *height = h;
 150       return TRUE;
 151    }
 152 }
 153
 154
 155 /**
 156  * Return the number of layers set in the framebuffer state.
 157  */
 158 unsigned
 159 util_framebuffer_get_num_layers(const struct pipe_framebuffer_state *fb)
 160 {
 161         unsigned i, num_layers = 0;
 162
 163         for (i = 0; i < fb->nr_cbufs; i++) {
 164                 if (fb->cbufs[i]) {
 165                         unsigned num = fb->cbufs[i]->u.tex.last_layer -
 166                                        fb->cbufs[i]->u.tex.first_layer + 1;
 167                         num_layers = MAX2(num_layers, num);
 168                 }
 169         }
 170         if (fb->zsbuf) {
 171                 unsigned num = fb->zsbuf->u.tex.last_layer -
 172                                fb->zsbuf->u.tex.first_layer + 1;
 173                 num_layers = MAX2(num_layers, num);
 174         }
 175         return num_layers;
 176 }
 177
 178
 179 /**
 180  * Return the number of MSAA samples.
 181  */
 182 unsigned
 183 util_framebuffer_get_num_samples(const struct pipe_framebuffer_state *fb)
 184 {
 185    unsigned i;
 186
 187    for (i = 0; i < fb->nr_cbufs; i++) {
 188       if (fb->cbufs[i]) {
 189          return MAX2(1, fb->cbufs[i]->texture->nr_samples);
 190       }
 191    }
 192    if (fb->zsbuf) {
 193       return MAX2(1, fb->zsbuf->texture->nr_samples);
 194    }
 195
 196    return 1;
 197 }