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_simple_screen.h"
  31 #include "util/u_memory.h"
  32 #include "pipe/p_context.h"
  33
  34 #include "fo_context.h"
  35 #include "fo_winsys.h"
  36
  37
  38
  39 static void failover_destroy( struct pipe_context *pipe )
  40 {
  41    struct failover_context *failover = failover_context( pipe );
  42
  43    free( failover );
  44 }
  45
  46
  47 void failover_fail_over( struct failover_context *failover )
  48 {
  49    failover->dirty = TRUE;
  50    failover->mode = FO_SW;
  51 }
  52
  53
  54 static void failover_draw_elements( struct pipe_context *pipe,
  55                                     struct pipe_buffer *indexBuffer,
  56                                     unsigned indexSize,
  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                                    indexBuffer,
  75                                    indexSize,
  76                                    prim,
  77                                    start,
  78                                    count );
  79    }
  80
  81    /* Possibly try software:
  82     */
  83    if (failover->mode == FO_SW) {
  84
  85       if (failover->dirty) {
  86          failover->hw->flush( failover->hw, ~0, NULL );
  87          failover_state_emit( failover );
  88       }
  89
  90       failover->sw->draw_elements( failover->sw,
  91                                    indexBuffer,
  92                                    indexSize,
  93                                    prim,
  94                                    start,
  95                                    count );
  96
  97       /* Be ready to switch back to hardware rendering without an
  98        * intervening flush.  Unlikely to be much performance impact to
  99        * this:
 100        */
 101       failover->sw->flush( failover->sw, ~0, NULL );
 102    }
 103 }
 104
 105
 106 static void failover_draw_arrays( struct pipe_context *pipe,
 107                                      unsigned prim, unsigned start, unsigned count)
 108 {
 109    failover_draw_elements(pipe, NULL, 0, prim, start, count);
 110 }
 111
 112 static unsigned int
 113 failover_is_texture_referenced( struct pipe_context *_pipe,
 114                                 struct pipe_texture *texture,
 115                                 unsigned face, unsigned level)
 116 {
 117    struct failover_context *failover = failover_context( _pipe );
 118    struct pipe_context *pipe = (failover->mode == FO_HW) ?
 119       failover->hw : failover->sw;
 120
 121    return pipe->is_texture_referenced(pipe, texture, face, level);
 122 }
 123
 124 static unsigned int
 125 failover_is_buffer_referenced( struct pipe_context *_pipe,
 126                                struct pipe_buffer *buf)
 127 {
 128    struct failover_context *failover = failover_context( _pipe );
 129    struct pipe_context *pipe = (failover->mode == FO_HW) ?
 130       failover->hw : failover->sw;
 131
 132    return pipe->is_buffer_referenced(pipe, buf);
 133 }
 134
 135 struct pipe_context *failover_create( struct pipe_context *hw,
 136                                       struct pipe_context *sw )
 137 {
 138    struct failover_context *failover = CALLOC_STRUCT(failover_context);
 139    if (failover == NULL)
 140       return NULL;
 141
 142    failover->hw = hw;
 143    failover->sw = sw;
 144    failover->pipe.winsys = hw->winsys;
 145    failover->pipe.screen = hw->screen;
 146    failover->pipe.destroy = failover_destroy;
 147 #if 0
 148    failover->pipe.is_format_supported = hw->is_format_supported;
 149    failover->pipe.get_name = hw->get_name;
 150    failover->pipe.get_vendor = hw->get_vendor;
 151    failover->pipe.get_param = hw->get_param;
 152    failover->pipe.get_paramf = hw->get_paramf;
 153 #endif
 154
 155    failover->pipe.draw_arrays = failover_draw_arrays;
 156    failover->pipe.draw_elements = failover_draw_elements;
 157    failover->pipe.clear = hw->clear;
 158
 159    /* No software occlusion fallback (or other optional functionality)
 160     * at this point - if the hardware doesn't support it, don't
 161     * advertise it to the application.
 162     */
 163    failover->pipe.begin_query = hw->begin_query;
 164    failover->pipe.end_query = hw->end_query;
 165
 166    failover_init_state_functions( failover );
 167
 168    failover->pipe.surface_copy = hw->surface_copy;
 169    failover->pipe.surface_fill = hw->surface_fill;
 170
 171 #if 0
 172    failover->pipe.texture_create = hw->texture_create;
 173    failover->pipe.texture_destroy = hw->texture_destroy;
 174    failover->pipe.get_tex_surface = hw->get_tex_surface;
 175    failover->pipe.texture_update = hw->texture_update;
 176 #endif
 177
 178    failover->pipe.flush = hw->flush;
 179    failover->pipe.is_texture_referenced = failover_is_texture_referenced;
 180    failover->pipe.is_buffer_referenced = failover_is_buffer_referenced;
 181
 182    failover->dirty = 0;
 183
 184    return &failover->pipe;
 185 }
 186