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 #include "util/u_inlines.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    unsigned i;
  43
  44    for (i = 0; i < failover->num_vertex_buffers; i++) {
  45       pipe_resource_reference(&failover->vertex_buffers[i].buffer, NULL);
  46    }
  47
  48    FREE( failover );
  49 }
  50
  51
  52 void failover_fail_over( struct failover_context *failover )
  53 {
  54    failover->dirty = TRUE;
  55    failover->mode = FO_SW;
  56 }
  57
  58
  59 static void failover_draw_vbo( struct pipe_context *pipe,
  60                                const struct pipe_draw_info *info)
  61 {
  62    struct failover_context *failover = failover_context( pipe );
  63
  64    /* If there has been any statechange since last time, try hardware
  65     * rendering again:
  66     */
  67    if (failover->dirty) {
  68       failover->mode = FO_HW;
  69    }
  70
  71    /* Try hardware:
  72     */
  73    if (failover->mode == FO_HW) {
  74       failover->hw->draw_vbo( failover->hw, info );
  75    }
  76
  77    /* Possibly try software:
  78     */
  79    if (failover->mode == FO_SW) {
  80
  81       if (failover->dirty) {
  82          failover->hw->flush( failover->hw, NULL );
  83          failover_state_emit( failover );
  84       }
  85
  86       failover->sw->draw_vbo( failover->sw, info );
  87
  88       /* Be ready to switch back to hardware rendering without an
  89        * intervening flush.  Unlikely to be much performance impact to
  90        * this:
  91        */
  92       failover->sw->flush( failover->sw, NULL );
  93    }
  94 }
  95
  96 struct pipe_context *failover_create( struct pipe_context *hw,
  97                                       struct pipe_context *sw )
  98 {
  99    struct failover_context *failover = CALLOC_STRUCT(failover_context);
 100    if (failover == NULL)
 101       return NULL;
 102
 103    failover->hw = hw;
 104    failover->sw = sw;
 105    failover->pipe.winsys = hw->winsys;
 106    failover->pipe.screen = hw->screen;
 107    failover->pipe.destroy = failover_destroy;
 108 #if 0
 109    failover->pipe.is_format_supported = hw->is_format_supported;
 110    failover->pipe.get_name = hw->get_name;
 111    failover->pipe.get_vendor = hw->get_vendor;
 112    failover->pipe.get_param = hw->get_param;
 113    failover->pipe.get_shader_param = hw->get_shader_param;
 114    failover->pipe.get_paramf = hw->get_paramf;
 115 #endif
 116
 117    failover->pipe.draw_vbo = failover_draw_vbo;
 118    failover->pipe.clear = hw->clear;
 119    failover->pipe.clear_render_target = hw->clear_render_target;
 120    failover->pipe.clear_depth_stencil = hw->clear_depth_stencil;
 121
 122    /* No software occlusion fallback (or other optional functionality)
 123     * at this point - if the hardware doesn't support it, don't
 124     * advertise it to the application.
 125     */
 126    failover->pipe.begin_query = hw->begin_query;
 127    failover->pipe.end_query = hw->end_query;
 128
 129    failover_init_state_functions( failover );
 130
 131    failover->pipe.resource_copy_region = hw->resource_copy_region;
 132
 133 #if 0
 134    failover->pipe.resource_create = hw->resource_create;
 135    failover->pipe.resource_destroy = hw->resource_destroy;
 136    failover->pipe.create_surface = hw->create_surface;
 137    failover->pipe.surface_destroy = hw->surface_destroy;
 138 #endif
 139
 140    failover->pipe.flush = hw->flush;
 141
 142    failover->dirty = 0;
 143
 144    return &failover->pipe;
 145 }
 146