src/gallium/drivers/failover/fo_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_defines.h"
  30 #include "util/u_memory.h"
  31 #include "pipe/p_context.h"
  32
  33 #include "fo_context.h"
  34 #include "fo_winsys.h"
  35
  36
  37
  38 static void failover_destroy( struct pipe_context *pipe )
  39 {
  40    struct failover_context *failover = failover_context( pipe );
  41
  42    FREE( failover );
  43 }
  44
  45
  46 void failover_fail_over( struct failover_context *failover )
  47 {
  48    failover->dirty = TRUE;
  49    failover->mode = FO_SW;
  50 }
  51
  52
  53 static void failover_draw_vbo( struct pipe_context *pipe,
  54                                const struct pipe_draw_info *info)
  55 {
  56    struct failover_context *failover = failover_context( pipe );
  57
  58    /* If there has been any statechange since last time, try hardware
  59     * rendering again:
  60     */
  61    if (failover->dirty) {
  62       failover->mode = FO_HW;
  63    }
  64
  65    /* Try hardware:
  66     */
  67    if (failover->mode == FO_HW) {
  68       failover->hw->draw_vbo( failover->hw, info );
  69    }
  70
  71    /* Possibly try software:
  72     */
  73    if (failover->mode == FO_SW) {
  74
  75       if (failover->dirty) {
  76          failover->hw->flush( failover->hw, ~0, NULL );
  77          failover_state_emit( failover );
  78       }
  79
  80       failover->sw->draw_vbo( failover->sw, info );
  81
  82       /* Be ready to switch back to hardware rendering without an
  83        * intervening flush.  Unlikely to be much performance impact to
  84        * this:
  85        */
  86       failover->sw->flush( failover->sw, ~0, NULL );
  87    }
  88 }
  89
  90 static unsigned int
  91 failover_is_resource_referenced( struct pipe_context *_pipe,
  92                                  struct pipe_resource *resource,
  93                                  unsigned face, unsigned level)
  94 {
  95    struct failover_context *failover = failover_context( _pipe );
  96    struct pipe_context *pipe = (failover->mode == FO_HW) ?
  97       failover->hw : failover->sw;
  98
  99    return pipe->is_resource_referenced(pipe, resource, face, level);
 100 }
 101
 102 struct pipe_context *failover_create( struct pipe_context *hw,
 103                                       struct pipe_context *sw )
 104 {
 105    struct failover_context *failover = CALLOC_STRUCT(failover_context);
 106    if (failover == NULL)
 107       return NULL;
 108
 109    failover->hw = hw;
 110    failover->sw = sw;
 111    failover->pipe.winsys = hw->winsys;
 112    failover->pipe.screen = hw->screen;
 113    failover->pipe.destroy = failover_destroy;
 114 #if 0
 115    failover->pipe.is_format_supported = hw->is_format_supported;
 116    failover->pipe.get_name = hw->get_name;
 117    failover->pipe.get_vendor = hw->get_vendor;
 118    failover->pipe.get_param = hw->get_param;
 119    failover->pipe.get_paramf = hw->get_paramf;
 120 #endif
 121
 122    failover->pipe.draw_vbo = failover_draw_vbo;
 123    failover->pipe.clear = hw->clear;
 124    failover->pipe.clear_render_target = hw->clear_render_target;
 125    failover->pipe.clear_depth_stencil = hw->clear_depth_stencil;
 126
 127    /* No software occlusion fallback (or other optional functionality)
 128     * at this point - if the hardware doesn't support it, don't
 129     * advertise it to the application.
 130     */
 131    failover->pipe.begin_query = hw->begin_query;
 132    failover->pipe.end_query = hw->end_query;
 133
 134    failover_init_state_functions( failover );
 135
 136    failover->pipe.resource_copy_region = hw->resource_copy_region;
 137
 138 #if 0
 139    failover->pipe.texture_create = hw->texture_create;
 140    failover->pipe.texture_destroy = hw->texture_destroy;
 141    failover->pipe.get_tex_surface = hw->get_tex_surface;
 142    failover->pipe.texture_update = hw->texture_update;
 143 #endif
 144
 145    failover->pipe.flush = hw->flush;
 146    failover->pipe.is_resource_referenced = failover_is_resource_referenced;
 147
 148    failover->dirty = 0;
 149
 150    return &failover->pipe;
 151 }
 152