src/gallium/auxiliary/draw/draw_vertex_shader.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
   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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34 #include "pipe/p_util.h"
  35 #include "pipe/p_shader_tokens.h"
  36 #include "draw_private.h"
  37 #include "draw_context.h"
  38 #include "draw_vs.h"
  39
  40
  41
  42 /**
  43  * Run the vertex shader on all vertices in the vertex queue.
  44  * Called by the draw module when the vertx cache needs to be flushed.
  45  */
  46 void
  47 draw_vertex_shader_queue_flush(struct draw_context *draw)
  48 {
  49    struct draw_vertex_shader *shader = draw->vertex_shader;
  50    unsigned i;
  51
  52    assert(draw->vs.queue_nr != 0);
  53
  54    /* XXX: do this on statechange:
  55     */
  56    shader->prepare( shader, draw );
  57
  58 //   fprintf(stderr, "%s %d\n", __FUNCTION__, draw->vs.queue_nr );
  59
  60    /* run vertex shader on vertex cache entries, four per invokation */
  61    for (i = 0; i < draw->vs.queue_nr; i += 4) {
  62       struct vertex_header *dests[4];
  63       unsigned elts[4];
  64       int j, n = MIN2(4, draw->vs.queue_nr - i);
  65
  66       for (j = 0; j < n; j++) {
  67          elts[j] = draw->vs.queue[i + j].elt;
  68          dests[j] = draw->vs.queue[i + j].vertex;
  69       }
  70
  71       for ( ; j < 4; j++) {
  72          elts[j] = elts[0];
  73          dests[j] = draw->vs.queue[i + j].vertex;
  74       }
  75
  76       assert(n > 0);
  77       assert(n <= 4);
  78
  79       shader->run(shader, draw, elts, n, dests);
  80    }
  81
  82    draw->vs.post_nr = draw->vs.queue_nr;
  83    draw->vs.queue_nr = 0;
  84 }
  85
  86
  87 struct draw_vertex_shader *
  88 draw_create_vertex_shader(struct draw_context *draw,
  89                           const struct pipe_shader_state *shader)
  90 {
  91    struct draw_vertex_shader *vs;
  92
  93    vs = draw_create_vs_llvm( draw, shader );
  94    if (!vs) {
  95       vs = draw_create_vs_sse( draw, shader );
  96       if (!vs) {
  97          vs = draw_create_vs_exec( draw, shader );
  98       }
  99    }
 100    assert(vs);
 101
 102    tgsi_scan_shader(shader->tokens, &vs->info);
 103
 104    return vs;
 105 }
 106
 107
 108 void
 109 draw_bind_vertex_shader(struct draw_context *draw,
 110                         struct draw_vertex_shader *dvs)
 111 {
 112    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 113
 114    if (dvs)
 115    {
 116       draw->vertex_shader = dvs;
 117       draw->num_vs_outputs = dvs->info.num_outputs;
 118
 119       tgsi_exec_machine_init(&draw->machine);
 120
 121       dvs->prepare( dvs, draw );
 122    }
 123    else {
 124       draw->vertex_shader = NULL;
 125       draw->num_vs_outputs = 0;
 126    }
 127 }
 128
 129
 130 void
 131 draw_delete_vertex_shader(struct draw_context *draw,
 132                           struct draw_vertex_shader *dvs)
 133 {
 134    dvs->delete( dvs );
 135 }