src/gallium/auxiliary/draw/draw_pt_fetch.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 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 #include "pipe/p_util.h"
  29 #include "draw/draw_context.h"
  30 #include "draw/draw_private.h"
  31 #include "draw/draw_vbuf.h"
  32 #include "draw/draw_vertex.h"
  33 #include "draw/draw_pt.h"
  34 #include "translate/translate.h"
  35 #include "translate/translate_cache.h"
  36
  37
  38 struct pt_fetch {
  39    struct draw_context *draw;
  40
  41    struct translate *translate;
  42
  43    unsigned vertex_size;
  44    boolean need_edgeflags;
  45
  46    struct translate_cache *cache;
  47 };
  48
  49 /* Perform the fetch from API vertex elements & vertex buffers, to a
  50  * contiguous set of float[4] attributes as required for the
  51  * vertex_shader->run_linear() method.
  52  *
  53  * This is used in all cases except pure passthrough
  54  * (draw_pt_fetch_emit.c) which has its own version to translate
  55  * directly to hw vertices.
  56  *
  57  */
  58 void draw_pt_fetch_prepare( struct pt_fetch *fetch,
  59                             unsigned vertex_size )
  60 {
  61    struct draw_context *draw = fetch->draw;
  62    unsigned i, nr = 0;
  63    unsigned dst_offset = 0;
  64    struct translate_key key;
  65
  66    fetch->vertex_size = vertex_size;
  67
  68    memset(&key, 0, sizeof(key));
  69
  70    /* Always emit/leave space for a vertex header.
  71     *
  72     * It's worth considering whether the vertex headers should contain
  73     * a pointer to the 'data', rather than having it inline.
  74     * Something to look at after we've fully switched over to the pt
  75     * paths.
  76     */
  77    {
  78       /* Need to set header->vertex_id = 0xffff somehow.
  79        */
  80       key.element[nr].input_format = PIPE_FORMAT_R32_FLOAT;
  81       key.element[nr].input_buffer = draw->pt.nr_vertex_buffers;
  82       key.element[nr].input_offset = 0;
  83       key.element[nr].output_format = PIPE_FORMAT_R32_FLOAT;
  84       key.element[nr].output_offset = dst_offset;
  85       dst_offset += 1 * sizeof(float);
  86       nr++;
  87
  88
  89       /* Just leave the clip[] array untouched.
  90        */
  91       dst_offset += 4 * sizeof(float);
  92    }
  93
  94
  95    for (i = 0; i < draw->pt.nr_vertex_elements; i++) {
  96       key.element[nr].input_format = draw->pt.vertex_element[i].src_format;
  97       key.element[nr].input_buffer = draw->pt.vertex_element[i].vertex_buffer_index;
  98       key.element[nr].input_offset = draw->pt.vertex_element[i].src_offset;
  99       key.element[nr].output_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 100       key.element[nr].output_offset = dst_offset;
 101
 102       dst_offset += 4 * sizeof(float);
 103       nr++;
 104    }
 105
 106    assert(dst_offset <= vertex_size);
 107
 108    key.nr_elements = nr;
 109    key.output_stride = vertex_size;
 110
 111
 112    if (!fetch->translate ||
 113        memcmp(&fetch->translate->key, &key, sizeof(key)) != 0)
 114    {
 115       fetch->translate = translate_cache_find(fetch->cache, &key);
 116
 117       {
 118          static struct vertex_header vh = { 0, 0, 0, 0xffff };
 119          fetch->translate->set_buffer(fetch->translate,
 120                                       draw->pt.nr_vertex_buffers,
 121                                       &vh,
 122                                       0);
 123       }
 124    }
 125
 126    fetch->need_edgeflags = ((draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 127                              draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) &&
 128                             draw->pt.user.edgeflag);
 129 }
 130
 131
 132
 133
 134 void draw_pt_fetch_run( struct pt_fetch *fetch,
 135                         const unsigned *elts,
 136                         unsigned count,
 137                         char *verts )
 138 {
 139    struct draw_context *draw = fetch->draw;
 140    struct translate *translate = fetch->translate;
 141    unsigned i;
 142
 143    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 144       translate->set_buffer(translate,
 145                             i,
 146                             ((char *)draw->pt.user.vbuffer[i] +
 147                              draw->pt.vertex_buffer[i].buffer_offset),
 148                             draw->pt.vertex_buffer[i].pitch );
 149    }
 150
 151    translate->run_elts( translate,
 152                         elts,
 153                         count,
 154                         verts );
 155
 156    /* Edgeflags are hard to fit into a translate program, populate
 157     * them separately if required.  In the setup above they are
 158     * defaulted to one, so only need this if there is reason to change
 159     * that default:
 160     */
 161    if (fetch->need_edgeflags) {
 162       for (i = 0; i < count; i++) {
 163          struct vertex_header *vh = (struct vertex_header *)(verts + i * fetch->vertex_size);
 164          vh->edgeflag = draw_pt_get_edgeflag( draw, elts[i] );
 165       }
 166    }
 167 }
 168
 169
 170 struct pt_fetch *draw_pt_fetch_create( struct draw_context *draw )
 171 {
 172    struct pt_fetch *fetch = CALLOC_STRUCT(pt_fetch);
 173    if (!fetch)
 174       return NULL;
 175
 176    fetch->draw = draw;
 177    fetch->cache = translate_cache_create();
 178    if (!fetch->cache) {
 179       FREE(fetch);
 180       return NULL;
 181    }
 182
 183    return fetch;
 184 }
 185
 186 void draw_pt_fetch_destroy( struct pt_fetch *fetch )
 187 {
 188    translate_cache_destroy(fetch->cache);
 189
 190    FREE(fetch);
 191 }
 192