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_elements( struct pipe_context *pipe,
  54                                     struct pipe_resource *indexResource,
  55                                     unsigned indexSize,
  56                                     int indexBias,
  57                                     unsigned prim,
  58                                     unsigned start,
  59                                     unsigned count)
  60 {
  61    struct failover_context *failover = failover_context( pipe );
  62
  63    /* If there has been any statechange since last time, try hardware
  64     * rendering again:
  65     */
  66    if (failover->dirty) {
  67       failover->mode = FO_HW;
  68    }
  69
  70    /* Try hardware:
  71     */
  72    if (failover->mode == FO_HW) {
  73       failover->hw->draw_elements( failover->hw,
  74                                    indexResource,
  75                                    indexSize,
  76                                    indexBias,
  77                                    prim,
  78                                    start,
  79                                    count );
  80    }
  81
  82    /* Possibly try software:
  83     */
  84    if (failover->mode == FO_SW) {
  85
  86       if (failover->dirty) {
  87          failover->hw->flush( failover->hw, ~0, NULL );
  88          failover_state_emit( failover );
  89       }
  90
  91       failover->sw->draw_elements( failover->sw,
  92                                    indexResource,
  93                                    indexSize,
  94                                    indexBias,
  95                                    prim,
  96                                    start,
  97                                    count );
  98
  99       /* Be ready to switch back to hardware rendering without an
 100        * intervening flush.  Unlikely to be much performance impact to
 101        * this:
 102        */
 103       failover->sw->flush( failover->sw, ~0, NULL );
 104    }
 105 }
 106
 107
 108 static void failover_draw_arrays( struct pipe_context *pipe,
 109                                      unsigned prim, unsigned start, unsigned count)
 110 {
 111    failover_draw_elements(pipe, NULL, 0, 0, prim, start, count);
 112 }
 113
 114 static unsigned int
 115 failover_is_resource_referenced( struct pipe_context *_pipe,
 116                                  struct pipe_resource *resource,
 117                                  unsigned face, unsigned level)
 118 {
 119    struct failover_context *failover = failover_context( _pipe );
 120    struct pipe_context *pipe = (failover->mode == FO_HW) ?
 121       failover->hw : failover->sw;
 122
 123    return pipe->is_resource_referenced(pipe, resource, face, level);
 124 }
 125
 126 struct pipe_context *failover_create( struct pipe_context *hw,
 127                                       struct pipe_context *sw )
 128 {
 129    struct failover_context *failover = CALLOC_STRUCT(failover_context);
 130    if (failover == NULL)
 131       return NULL;
 132
 133    failover->hw = hw;
 134    failover->sw = sw;
 135    failover->pipe.winsys = hw->winsys;
 136    failover->pipe.screen = hw->screen;
 137    failover->pipe.destroy = failover_destroy;
 138 #if 0
 139    failover->pipe.is_format_supported = hw->is_format_supported;
 140    failover->pipe.get_name = hw->get_name;
 141    failover->pipe.get_vendor = hw->get_vendor;
 142    failover->pipe.get_param = hw->get_param;
 143    failover->pipe.get_paramf = hw->get_paramf;
 144 #endif
 145
 146    failover->pipe.draw_arrays = failover_draw_arrays;
 147    failover->pipe.draw_elements = failover_draw_elements;
 148    failover->pipe.clear = hw->clear;
 149    failover->pipe.clear_render_target = hw->clear_render_target;
 150    failover->pipe.clear_depth_stencil = hw->clear_depth_stencil;
 151
 152    /* No software occlusion fallback (or other optional functionality)
 153     * at this point - if the hardware doesn't support it, don't
 154     * advertise it to the application.
 155     */
 156    failover->pipe.begin_query = hw->begin_query;
 157    failover->pipe.end_query = hw->end_query;
 158
 159    failover_init_state_functions( failover );
 160
 161    failover->pipe.resource_copy_region = hw->resource_copy_region;
 162
 163 #if 0
 164    failover->pipe.texture_create = hw->texture_create;
 165    failover->pipe.texture_destroy = hw->texture_destroy;
 166    failover->pipe.get_tex_surface = hw->get_tex_surface;
 167    failover->pipe.texture_update = hw->texture_update;
 168 #endif
 169
 170    failover->pipe.flush = hw->flush;
 171    failover->pipe.is_resource_referenced = failover_is_resource_referenced;
 172
 173    failover->dirty = 0;
 174
 175    return &failover->pipe;
 176 }
 177