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
  45    struct translate_cache *cache;
  46 };
  47
  48 /* Perform the fetch from API vertex elements & vertex buffers, to a
  49  * contiguous set of float[4] attributes as required for the
  50  * vertex_shader->run_linear() method.
  51  *
  52  * This is used in all cases except pure passthrough
  53  * (draw_pt_fetch_emit.c) which has its own version to translate
  54  * directly to hw vertices.
  55  *
  56  */
  57 void draw_pt_fetch_prepare( struct pt_fetch *fetch,
  58                             unsigned vertex_size )
  59 {
  60    struct draw_context *draw = fetch->draw;
  61    unsigned i, nr = 0;
  62    unsigned dst_offset = 0;
  63    struct translate_key key;
  64
  65    fetch->vertex_size = vertex_size;
  66
  67    memset(&key, 0, sizeof(key));
  68
  69    /* Always emit/leave space for a vertex header.
  70     *
  71     * It's worth considering whether the vertex headers should contain
  72     * a pointer to the 'data', rather than having it inline.
  73     * Something to look at after we've fully switched over to the pt
  74     * paths.
  75     */
  76    {
  77       /* Need to set header->vertex_id = 0xffff somehow.
  78        */
  79       key.element[nr].input_format = PIPE_FORMAT_R32_FLOAT;
  80       key.element[nr].input_buffer = draw->pt.nr_vertex_buffers;
  81       key.element[nr].input_offset = 0;
  82       key.element[nr].output_format = PIPE_FORMAT_R32_FLOAT;
  83       key.element[nr].output_offset = dst_offset;
  84       dst_offset += 1 * sizeof(float);
  85       nr++;
  86
  87
  88       /* Just leave the clip[] array untouched.
  89        */
  90       dst_offset += 4 * sizeof(float);
  91    }
  92
  93
  94    for (i = 0; i < draw->pt.nr_vertex_elements; i++) {
  95       key.element[nr].input_format = draw->pt.vertex_element[i].src_format;
  96       key.element[nr].input_buffer = draw->pt.vertex_element[i].vertex_buffer_index;
  97       key.element[nr].input_offset = draw->pt.vertex_element[i].src_offset;
  98       key.element[nr].output_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  99       key.element[nr].output_offset = dst_offset;
 100
 101       dst_offset += 4 * sizeof(float);
 102       nr++;
 103    }
 104
 105    assert(dst_offset <= vertex_size);
 106
 107    key.nr_elements = nr;
 108    key.output_stride = vertex_size;
 109
 110
 111    if (!fetch->translate ||
 112        memcmp(&fetch->translate->key, &key, sizeof(key)) != 0)
 113    {
 114       fetch->translate = translate_cache_find(fetch->cache, &key);
 115
 116       {
 117          static struct vertex_header vh = { 0, 0, 0, 0xffff };
 118          fetch->translate->set_buffer(fetch->translate,
 119                                       draw->pt.nr_vertex_buffers,
 120                                       &vh,
 121                                       0);
 122       }
 123    }
 124 }
 125
 126
 127
 128
 129 void draw_pt_fetch_run( struct pt_fetch *fetch,
 130                         const unsigned *elts,
 131                         unsigned count,
 132                         char *verts )
 133 {
 134    struct draw_context *draw = fetch->draw;
 135    struct translate *translate = fetch->translate;
 136    unsigned i;
 137
 138    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 139       translate->set_buffer(translate,
 140                             i,
 141                             ((char *)draw->pt.user.vbuffer[i] +
 142                              draw->pt.vertex_buffer[i].buffer_offset),
 143                             draw->pt.vertex_buffer[i].pitch );
 144    }
 145
 146    translate->run_elts( translate,
 147                         elts,
 148                         count,
 149                         verts );
 150 }
 151
 152
 153 struct pt_fetch *draw_pt_fetch_create( struct draw_context *draw )
 154 {
 155    struct pt_fetch *fetch = CALLOC_STRUCT(pt_fetch);
 156    if (!fetch)
 157       return NULL;
 158
 159    fetch->draw = draw;
 160    fetch->cache = translate_cache_create();
 161    if (!fetch->cache) {
 162       FREE(fetch);
 163       return NULL;
 164    }
 165
 166    return fetch;
 167 }
 168
 169 void draw_pt_fetch_destroy( struct pt_fetch *fetch )
 170 {
 171    translate_cache_destroy(fetch->cache);
 172
 173    FREE(fetch);
 174 }
 175