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    /* Always emit/leave space for a vertex header.
  69     *
  70     * It's worth considering whether the vertex headers should contain
  71     * a pointer to the 'data', rather than having it inline.
  72     * Something to look at after we've fully switched over to the pt
  73     * paths.
  74     */
  75    {
  76       /* Need to set header->vertex_id = 0xffff somehow.
  77        */
  78       key.element[nr].input_format = PIPE_FORMAT_R32_FLOAT;
  79       key.element[nr].input_buffer = draw->pt.nr_vertex_buffers;
  80       key.element[nr].input_offset = 0;
  81       key.element[nr].output_format = PIPE_FORMAT_R32_FLOAT;
  82       key.element[nr].output_offset = dst_offset;
  83       dst_offset += 1 * sizeof(float);
  84       nr++;
  85
  86
  87       /* Just leave the clip[] array untouched.
  88        */
  89       dst_offset += 4 * sizeof(float);
  90    }
  91
  92
  93    for (i = 0; i < draw->pt.nr_vertex_elements; i++) {
  94       key.element[nr].input_format = draw->pt.vertex_element[i].src_format;
  95       key.element[nr].input_buffer = draw->pt.vertex_element[i].vertex_buffer_index;
  96       key.element[nr].input_offset = draw->pt.vertex_element[i].src_offset;
  97       key.element[nr].output_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  98       key.element[nr].output_offset = dst_offset;
  99
 100       dst_offset += 4 * sizeof(float);
 101       nr++;
 102    }
 103
 104    assert(dst_offset <= vertex_size);
 105
 106    key.nr_elements = nr;
 107    key.output_stride = vertex_size;
 108
 109
 110    if (!fetch->translate ||
 111        translate_key_compare(&fetch->translate->key, &key) != 0)
 112    {
 113       translate_key_sanitize(&key);
 114       fetch->translate = translate_cache_find(fetch->cache, &key);
 115
 116       {
 117          static struct vertex_header vh = { 0, 1, 0, 0xffff };
 118          fetch->translate->set_buffer(fetch->translate,
 119                                       draw->pt.nr_vertex_buffers,
 120                                       &vh,
 121                                       0);
 122       }
 123    }
 124
 125    fetch->need_edgeflags = ((draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 126                              draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) &&
 127                             draw->pt.user.edgeflag);
 128 }
 129
 130
 131
 132
 133 void draw_pt_fetch_run( struct pt_fetch *fetch,
 134                         const unsigned *elts,
 135                         unsigned count,
 136                         char *verts )
 137 {
 138    struct draw_context *draw = fetch->draw;
 139    struct translate *translate = fetch->translate;
 140    unsigned i;
 141
 142    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 143       translate->set_buffer(translate,
 144                             i,
 145                             ((char *)draw->pt.user.vbuffer[i] +
 146                              draw->pt.vertex_buffer[i].buffer_offset),
 147                             draw->pt.vertex_buffer[i].pitch );
 148    }
 149
 150    translate->run_elts( translate,
 151                         elts,
 152                         count,
 153                         verts );
 154
 155    /* Edgeflags are hard to fit into a translate program, populate
 156     * them separately if required.  In the setup above they are
 157     * defaulted to one, so only need this if there is reason to change
 158     * that default:
 159     */
 160    if (fetch->need_edgeflags) {
 161       for (i = 0; i < count; i++) {
 162          struct vertex_header *vh = (struct vertex_header *)(verts + i * fetch->vertex_size);
 163          vh->edgeflag = draw_pt_get_edgeflag( draw, elts[i] );
 164       }
 165    }
 166 }
 167
 168
 169 void draw_pt_fetch_run_linear( struct pt_fetch *fetch,
 170                                unsigned start,
 171                                unsigned count,
 172                                char *verts )
 173 {
 174    struct draw_context *draw = fetch->draw;
 175    struct translate *translate = fetch->translate;
 176    unsigned i;
 177
 178    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 179       translate->set_buffer(translate,
 180                             i,
 181                             ((char *)draw->pt.user.vbuffer[i] +
 182                              draw->pt.vertex_buffer[i].buffer_offset),
 183                             draw->pt.vertex_buffer[i].pitch );
 184    }
 185
 186    translate->run( translate,
 187                    start,
 188                    count,
 189                    verts );
 190
 191    /* Edgeflags are hard to fit into a translate program, populate
 192     * them separately if required.  In the setup above they are
 193     * defaulted to one, so only need this if there is reason to change
 194     * that default:
 195     */
 196    if (fetch->need_edgeflags) {
 197       for (i = 0; i < count; i++) {
 198          struct vertex_header *vh = (struct vertex_header *)(verts + i * fetch->vertex_size);
 199          vh->edgeflag = draw_pt_get_edgeflag( draw, start + i );
 200       }
 201    }
 202 }
 203
 204
 205 struct pt_fetch *draw_pt_fetch_create( struct draw_context *draw )
 206 {
 207    struct pt_fetch *fetch = CALLOC_STRUCT(pt_fetch);
 208    if (!fetch)
 209       return NULL;
 210
 211    fetch->draw = draw;
 212    fetch->cache = translate_cache_create();
 213    if (!fetch->cache) {
 214       FREE(fetch);
 215       return NULL;
 216    }
 217
 218    return fetch;
 219 }
 220
 221 void draw_pt_fetch_destroy( struct pt_fetch *fetch )
 222 {
 223    if (fetch->cache)
 224       translate_cache_destroy(fetch->cache);
 225
 226    FREE(fetch);
 227 }
 228