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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  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    if (dst->samples != src->samples ||
  59        dst->layers  != src->layers)
  60       return FALSE;
  61
  62    if (dst->nr_cbufs != src->nr_cbufs) {
  63       return FALSE;
  64    }
  65
  66    for (i = 0; i < src->nr_cbufs; i++) {
  67       if (dst->cbufs[i] != src->cbufs[i]) {
  68          return FALSE;
  69       }
  70    }
  71
  72    if (dst->zsbuf != src->zsbuf) {
  73       return FALSE;
  74    }
  75
  76    return TRUE;
  77 }
  78
  79
  80 /**
  81  * Copy framebuffer state from src to dst, updating refcounts.
  82  */
  83 void
  84 util_copy_framebuffer_state(struct pipe_framebuffer_state *dst,
  85                             const struct pipe_framebuffer_state *src)
  86 {
  87    unsigned i;
  88
  89    dst->width = src->width;
  90    dst->height = src->height;
  91
  92    dst->samples = src->samples;
  93    dst->layers  = src->layers;
  94
  95    for (i = 0; i < src->nr_cbufs; i++)
  96       pipe_surface_reference(&dst->cbufs[i], src->cbufs[i]);
  97
  98    /* Set remaining dest cbuf pointers to NULL */
  99    for ( ; i < Elements(dst->cbufs); i++)
 100       pipe_surface_reference(&dst->cbufs[i], NULL);
 101
 102    dst->nr_cbufs = src->nr_cbufs;
 103
 104    pipe_surface_reference(&dst->zsbuf, src->zsbuf);
 105 }
 106
 107
 108 void
 109 util_unreference_framebuffer_state(struct pipe_framebuffer_state *fb)
 110 {
 111    unsigned i;
 112
 113    for (i = 0; i < fb->nr_cbufs; i++) {
 114       pipe_surface_reference(&fb->cbufs[i], NULL);
 115    }
 116
 117    pipe_surface_reference(&fb->zsbuf, NULL);
 118
 119    fb->samples = fb->layers = 0;
 120    fb->width = fb->height = 0;
 121    fb->nr_cbufs = 0;
 122 }
 123
 124
 125 /* Where multiple sizes are allowed for framebuffer surfaces, find the
 126  * minimum width and height of all bound surfaces.
 127  */
 128 boolean
 129 util_framebuffer_min_size(const struct pipe_framebuffer_state *fb,
 130                           unsigned *width,
 131                           unsigned *height)
 132 {
 133    unsigned w = ~0;
 134    unsigned h = ~0;
 135    unsigned i;
 136
 137    for (i = 0; i < fb->nr_cbufs; i++) {
 138       if (!fb->cbufs[i])
 139          continue;
 140
 141       w = MIN2(w, fb->cbufs[i]->width);
 142       h = MIN2(h, fb->cbufs[i]->height);
 143    }
 144
 145    if (fb->zsbuf) {
 146       w = MIN2(w, fb->zsbuf->width);
 147       h = MIN2(h, fb->zsbuf->height);
 148    }
 149
 150    if (w == ~0) {
 151       *width = 0;
 152       *height = 0;
 153       return FALSE;
 154    }
 155    else {
 156       *width = w;
 157       *height = h;
 158       return TRUE;
 159    }
 160 }
 161
 162
 163 /**
 164  * Return the number of layers set in the framebuffer state.
 165  */
 166 unsigned
 167 util_framebuffer_get_num_layers(const struct pipe_framebuffer_state *fb)
 168 {
 169         unsigned i, num_layers = 0;
 170
 171         /**
 172          * In the case of ARB_framebuffer_no_attachment
 173          * we obtain the number of layers directly from
 174          * the framebuffer state.
 175          */
 176         if (!(fb->nr_cbufs || fb->zsbuf))
 177                 return fb->layers;
 178
 179         for (i = 0; i < fb->nr_cbufs; i++) {
 180                 if (fb->cbufs[i]) {
 181                         unsigned num = fb->cbufs[i]->u.tex.last_layer -
 182                                        fb->cbufs[i]->u.tex.first_layer + 1;
 183                         num_layers = MAX2(num_layers, num);
 184                 }
 185         }
 186         if (fb->zsbuf) {
 187                 unsigned num = fb->zsbuf->u.tex.last_layer -
 188                                fb->zsbuf->u.tex.first_layer + 1;
 189                 num_layers = MAX2(num_layers, num);
 190         }
 191         return num_layers;
 192 }
 193
 194
 195 /**
 196  * Return the number of MSAA samples.
 197  */
 198 unsigned
 199 util_framebuffer_get_num_samples(const struct pipe_framebuffer_state *fb)
 200 {
 201    unsigned i;
 202
 203    /**
 204     * In the case of ARB_framebuffer_no_attachment
 205     * we obtain the number of samples directly from
 206     * the framebuffer state.
 207     *
 208     * NOTE: fb->samples may wind up as zero due to memset()'s on internal
 209     *       driver structures on their initialization and so we take the
 210     *       MAX here to ensure we have a valid number of samples. However,
 211     *       if samples is legitimately not getting set somewhere
 212     *       multi-sampling will evidently break.
 213     */
 214    if (!(fb->nr_cbufs || fb->zsbuf))
 215       return MAX2(fb->samples, 1);
 216
 217    for (i = 0; i < fb->nr_cbufs; i++) {
 218       if (fb->cbufs[i]) {
 219          return MAX2(1, fb->cbufs[i]->texture->nr_samples);
 220       }
 221    }
 222    if (fb->zsbuf) {
 223       return MAX2(1, fb->zsbuf->texture->nr_samples);
 224    }
 225
 226    return 1;
 227 }