src/gallium/auxiliary/util/u_surface.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 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  * Surface 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_surface.h"
  42
  43
  44 /**
  45  * Helper to quickly create an RGBA rendering surface of a certain size.
  46  * \param textureOut  returns the new texture
  47  * \param surfaceOut  returns the new surface
  48  * \return TRUE for success, FALSE if failure
  49  */
  50 boolean
  51 util_create_rgba_surface(struct pipe_screen *screen,
  52                          uint width, uint height,
  53                          uint bind,
  54                          struct pipe_resource **textureOut,
  55                          struct pipe_surface **surfaceOut)
  56 {
  57    static const enum pipe_format rgbaFormats[] = {
  58       PIPE_FORMAT_B8G8R8A8_UNORM,
  59       PIPE_FORMAT_A8R8G8B8_UNORM,
  60       PIPE_FORMAT_A8B8G8R8_UNORM,
  61       PIPE_FORMAT_NONE
  62    };
  63    const uint target = PIPE_TEXTURE_2D;
  64    enum pipe_format format = PIPE_FORMAT_NONE;
  65    struct pipe_resource templ;
  66    uint i;
  67
  68    /* Choose surface format */
  69    for (i = 0; rgbaFormats[i]; i++) {
  70       if (screen->is_format_supported(screen, rgbaFormats[i],
  71                                       target, bind, 0)) {
  72          format = rgbaFormats[i];
  73          break;
  74       }
  75    }
  76    if (format == PIPE_FORMAT_NONE)
  77       return FALSE;  /* unable to get an rgba format!?! */
  78
  79    /* create texture */
  80    memset(&templ, 0, sizeof(templ));
  81    templ.target = target;
  82    templ.format = format;
  83    templ.last_level = 0;
  84    templ.width0 = width;
  85    templ.height0 = height;
  86    templ.depth0 = 1;
  87    templ.bind = bind;
  88
  89    *textureOut = screen->resource_create(screen, &templ);
  90    if (!*textureOut)
  91       return FALSE;
  92
  93    /* create surface / view into texture */
  94    *surfaceOut = screen->get_tex_surface(screen,
  95                                          *textureOut,
  96                                          0, 0, 0,
  97                                          bind);
  98    if (!*surfaceOut) {
  99       pipe_resource_reference(textureOut, NULL);
 100       return FALSE;
 101    }
 102
 103    return TRUE;
 104 }
 105
 106
 107 /**
 108  * Release the surface and texture from util_create_rgba_surface().
 109  */
 110 void
 111 util_destroy_rgba_surface(struct pipe_resource *texture,
 112                           struct pipe_surface *surface)
 113 {
 114    pipe_surface_reference(&surface, NULL);
 115    pipe_resource_reference(&texture, NULL);
 116 }