src/gallium/auxiliary/draw/draw_pt_fetch_emit.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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
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  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
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "pipe/p_util.h"
  34 #include "draw/draw_context.h"
  35 #include "draw/draw_private.h"
  36 #include "draw/draw_vbuf.h"
  37 #include "draw/draw_vertex.h"
  38 #include "draw/draw_pt.h"
  39 #include "translate/translate.h"
  40 #include "translate/translate_cache.h"
  41
  42 /* The simplest 'middle end' in the new vertex code.
  43  *
  44  * The responsibilities of a middle end are to:
  45  *  - perform vertex fetch using
  46  *       - draw vertex element/buffer state
  47  *       - a list of fetch indices we received as an input
  48  *  - run the vertex shader
  49  *  - cliptest,
  50  *  - clip coord calculation
  51  *  - viewport transformation
  52  *  - if necessary, run the primitive pipeline, passing it:
  53  *       - a linear array of vertex_header vertices constructed here
  54  *       - a set of draw indices we received as an input
  55  *  - otherwise, drive the hw backend,
  56  *       - allocate space for hardware format vertices
  57  *       - translate the vertex-shader output vertices to hw format
  58  *       - calling the backend draw functions.
  59  *
  60  * For convenience, we provide a helper function to drive the hardware
  61  * backend given similar inputs to those required to run the pipeline.
  62  *
  63  * In the case of passthrough mode, many of these actions are disabled
  64  * or noops, so we end up doing:
  65  *
  66  *  - perform vertex fetch
  67  *  - drive the hw backend
  68  *
  69  * IE, basically just vertex fetch to post-vs-format vertices,
  70  * followed by a call to the backend helper function.
  71  */
  72
  73
  74 struct fetch_emit_middle_end {
  75    struct draw_pt_middle_end base;
  76    struct draw_context *draw;
  77
  78    struct translate *translate;
  79    const struct vertex_info *vinfo;
  80
  81    /* Cache point size somewhere it's address won't change:
  82     */
  83    float point_size;
  84
  85    struct translate_cache *cache;
  86 };
  87
  88
  89
  90
  91 static void fetch_emit_prepare( struct draw_pt_middle_end *middle,
  92                                 unsigned prim,
  93                                 unsigned opt )
  94 {
  95    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
  96    struct draw_context *draw = feme->draw;
  97    const struct vertex_info *vinfo;
  98    unsigned i, dst_offset;
  99    boolean ok;
 100    struct translate_key key;
 101
 102
 103    ok = draw->render->set_primitive( draw->render,
 104                                      prim );
 105    if (!ok) {
 106       assert(0);
 107       return;
 108    }
 109
 110    /* Must do this after set_primitive() above:
 111     */
 112    vinfo = feme->vinfo = draw->render->get_vertex_info(draw->render);
 113
 114
 115
 116    /* Transform from API vertices to HW vertices, skipping the
 117     * pipeline_vertex intermediate step.
 118     */
 119    dst_offset = 0;
 120    memset(&key, 0, sizeof(key));
 121
 122    for (i = 0; i < vinfo->num_attribs; i++) {
 123       const struct pipe_vertex_element *src = &draw->pt.vertex_element[vinfo->src_index[i]];
 124
 125       unsigned emit_sz = 0;
 126       unsigned input_format = src->src_format;
 127       unsigned input_buffer = src->vertex_buffer_index;
 128       unsigned input_offset = src->src_offset;
 129       unsigned output_format;
 130
 131       switch (vinfo->emit[i]) {
 132       case EMIT_4F:
 133          output_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 134          emit_sz = 4 * sizeof(float);
 135          break;
 136       case EMIT_3F:
 137          output_format = PIPE_FORMAT_R32G32B32_FLOAT;
 138          emit_sz = 3 * sizeof(float);
 139          break;
 140       case EMIT_2F:
 141          output_format = PIPE_FORMAT_R32G32_FLOAT;
 142          emit_sz = 2 * sizeof(float);
 143          break;
 144       case EMIT_1F:
 145          output_format = PIPE_FORMAT_R32_FLOAT;
 146          emit_sz = 1 * sizeof(float);
 147          break;
 148       case EMIT_1F_PSIZE:
 149          input_format = PIPE_FORMAT_R32_FLOAT;
 150          input_buffer = draw->pt.nr_vertex_buffers;
 151          input_offset = 0;
 152          output_format = PIPE_FORMAT_R32_FLOAT;
 153          emit_sz = 1 * sizeof(float);
 154          break;
 155       default:
 156          assert(0);
 157          output_format = PIPE_FORMAT_NONE;
 158          emit_sz = 0;
 159          continue;
 160       }
 161
 162       key.element[i].input_format = input_format;
 163       key.element[i].input_buffer = input_buffer;
 164       key.element[i].input_offset = input_offset;
 165       key.element[i].output_format = output_format;
 166       key.element[i].output_offset = dst_offset;
 167
 168       dst_offset += emit_sz;
 169    }
 170
 171    key.nr_elements = vinfo->num_attribs;
 172    key.output_stride = vinfo->size * 4;
 173
 174    /* Don't bother with caching at this stage:
 175     */
 176    if (!feme->translate ||
 177        translate_key_compare(&feme->translate->key, &key) != 0)
 178    {
 179       translate_key_sanitize(&key);
 180       feme->translate = translate_cache_find(feme->cache,
 181                                              &key);
 182
 183
 184       feme->translate->set_buffer(feme->translate,
 185                                   draw->pt.nr_vertex_buffers,
 186                                   &feme->point_size,
 187                                   0);
 188    }
 189
 190    feme->point_size = draw->rasterizer->point_size;
 191
 192    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 193       feme->translate->set_buffer(feme->translate,
 194                                   i,
 195                                   ((char *)draw->pt.user.vbuffer[i] +
 196                                    draw->pt.vertex_buffer[i].buffer_offset),
 197                                   draw->pt.vertex_buffer[i].pitch );
 198    }
 199 }
 200
 201
 202
 203
 204
 205 static void fetch_emit_run( struct draw_pt_middle_end *middle,
 206                             const unsigned *fetch_elts,
 207                             unsigned fetch_count,
 208                             const ushort *draw_elts,
 209                             unsigned draw_count )
 210 {
 211    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 212    struct draw_context *draw = feme->draw;
 213    void *hw_verts;
 214
 215    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 216     */
 217    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 218
 219    hw_verts = draw->render->allocate_vertices( draw->render,
 220                                                (ushort)feme->translate->key.output_stride,
 221                                                (ushort)fetch_count );
 222    if (!hw_verts) {
 223       assert(0);
 224       return;
 225    }
 226
 227
 228    /* Single routine to fetch vertices and emit HW verts.
 229     */
 230    feme->translate->run_elts( feme->translate,
 231                               fetch_elts,
 232                               fetch_count,
 233                               hw_verts );
 234
 235    if (0) {
 236       unsigned i;
 237       for (i = 0; i < fetch_count; i++) {
 238          debug_printf("\n\nvertex %d:\n", i);
 239          draw_dump_emitted_vertex( feme->vinfo,
 240                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 241       }
 242    }
 243
 244    /* XXX: Draw arrays path to avoid re-emitting index list again and
 245     * again.
 246     */
 247    draw->render->draw( draw->render,
 248                        draw_elts,
 249                        draw_count );
 250
 251    /* Done -- that was easy, wasn't it:
 252     */
 253    draw->render->release_vertices( draw->render,
 254                                    hw_verts,
 255                                    feme->translate->key.output_stride,
 256                                    fetch_count );
 257
 258 }
 259
 260
 261
 262 static void fetch_emit_finish( struct draw_pt_middle_end *middle )
 263 {
 264    /* nothing to do */
 265 }
 266
 267 static void fetch_emit_destroy( struct draw_pt_middle_end *middle )
 268 {
 269    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 270
 271    translate_cache_destroy(feme->cache);
 272
 273    FREE(middle);
 274 }
 275
 276
 277 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw )
 278 {
 279    struct fetch_emit_middle_end *fetch_emit = CALLOC_STRUCT( fetch_emit_middle_end );
 280    if (fetch_emit == NULL)
 281       return NULL;
 282
 283    fetch_emit->cache = translate_cache_create();
 284    if (!fetch_emit->cache) {
 285       FREE(fetch_emit);
 286       return NULL;
 287    }
 288
 289    fetch_emit->base.prepare = fetch_emit_prepare;
 290    fetch_emit->base.run     = fetch_emit_run;
 291    fetch_emit->base.finish  = fetch_emit_finish;
 292    fetch_emit->base.destroy = fetch_emit_destroy;
 293
 294    fetch_emit->draw = draw;
 295
 296    return &fetch_emit->base;
 297 }
 298