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 "pipe/p_winsys.h"
  31 #include "pipe/p_util.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
  48 static boolean failover_draw_elements( struct pipe_context *pipe,
  49                                        struct pipe_buffer *indexBuffer,
  50                                        unsigned indexSize,
  51                                        unsigned prim, unsigned start, unsigned count)
  52 {
  53    struct failover_context *failover = failover_context( pipe );
  54
  55    /* If there has been any statechange since last time, try hardware
  56     * rendering again:
  57     */
  58    if (failover->dirty) {
  59       failover->mode = FO_HW;
  60    }
  61
  62    /* Try hardware:
  63     */
  64    if (failover->mode == FO_HW) {
  65       if (!failover->hw->draw_elements( failover->hw,
  66                                         indexBuffer,
  67                                         indexSize,
  68                                         prim,
  69                                         start,
  70                                         count )) {
  71
  72          failover->hw->flush( failover->hw, ~0, NULL );
  73          failover->mode = FO_SW;
  74       }
  75    }
  76
  77    /* Possibly try software:
  78     */
  79    if (failover->mode == FO_SW) {
  80
  81       if (failover->dirty)
  82          failover_state_emit( failover );
  83
  84       failover->sw->draw_elements( failover->sw,
  85                                    indexBuffer,
  86                                    indexSize,
  87                                    prim,
  88                                    start,
  89                                    count );
  90
  91       /* Be ready to switch back to hardware rendering without an
  92        * intervening flush.  Unlikely to be much performance impact to
  93        * this:
  94        */
  95       failover->sw->flush( failover->sw, ~0, NULL );
  96    }
  97
  98    return TRUE;
  99 }
 100
 101
 102 static boolean failover_draw_arrays( struct pipe_context *pipe,
 103                                      unsigned prim, unsigned start, unsigned count)
 104 {
 105    return failover_draw_elements(pipe, NULL, 0, prim, start, count);
 106 }
 107
 108
 109
 110 struct pipe_context *failover_create( struct pipe_context *hw,
 111                                       struct pipe_context *sw )
 112 {
 113    struct failover_context *failover = CALLOC_STRUCT(failover_context);
 114    if (failover == NULL)
 115       return NULL;
 116
 117    failover->hw = hw;
 118    failover->sw = sw;
 119    failover->pipe.winsys = hw->winsys;
 120    failover->pipe.screen = hw->screen;
 121    failover->pipe.destroy = failover_destroy;
 122 #if 0
 123    failover->pipe.is_format_supported = hw->is_format_supported;
 124    failover->pipe.get_name = hw->get_name;
 125    failover->pipe.get_vendor = hw->get_vendor;
 126    failover->pipe.get_param = hw->get_param;
 127    failover->pipe.get_paramf = hw->get_paramf;
 128 #endif
 129
 130    failover->pipe.draw_arrays = failover_draw_arrays;
 131    failover->pipe.draw_elements = failover_draw_elements;
 132    failover->pipe.clear = hw->clear;
 133
 134    /* No software occlusion fallback (or other optional functionality)
 135     * at this point - if the hardware doesn't support it, don't
 136     * advertise it to the application.
 137     */
 138    failover->pipe.begin_query = hw->begin_query;
 139    failover->pipe.end_query = hw->end_query;
 140
 141    failover_init_state_functions( failover );
 142
 143    failover->pipe.surface_copy = hw->surface_copy;
 144    failover->pipe.surface_fill = hw->surface_fill;
 145
 146 #if 0
 147    failover->pipe.texture_create = hw->texture_create;
 148    failover->pipe.texture_release = hw->texture_release;
 149    failover->pipe.get_tex_surface = hw->get_tex_surface;
 150    failover->pipe.texture_update = hw->texture_update;
 151 #endif
 152
 153    failover->pipe.flush = hw->flush;
 154
 155    failover->dirty = 0;
 156
 157    return &failover->pipe;
 158 }
 159