src/gallium/drivers/llvmpipe/lp_draw_arrays.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 /* Author:
  29  *    Brian Paul
  30  *    Keith Whitwell
  31  */
  32
  33
  34 #include "pipe/p_defines.h"
  35 #include "pipe/p_context.h"
  36 #include "util/u_prim.h"
  37
  38 #include "lp_context.h"
  39 #include "lp_state.h"
  40 #include "lp_query.h"
  41
  42 #include "draw/draw_context.h"
  43
  44
  45
  46 /**
  47  * Draw vertex arrays, with optional indexing, optional instancing.
  48  * All the other drawing functions are implemented in terms of this function.
  49  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  50  * the drawing to the 'draw' module.
  51  */
  52 static void
  53 llvmpipe_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
  54 {
  55    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  56    struct draw_context *draw = lp->draw;
  57    const void *mapped_indices = NULL;
  58    unsigned i;
  59
  60    if (!llvmpipe_check_render_cond(lp))
  61       return;
  62
  63    if (lp->dirty)
  64       llvmpipe_update_derived( lp );
  65
  66    /*
  67     * Map vertex buffers
  68     */
  69    for (i = 0; i < lp->num_vertex_buffers; i++) {
  70       const void *buf = lp->vertex_buffer[i].user_buffer;
  71       size_t size = ~0;
  72       if (!buf) {
  73          if (!lp->vertex_buffer[i].buffer) {
  74             continue;
  75          }
  76          buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
  77          size = lp->vertex_buffer[i].buffer->width0;
  78       }
  79       draw_set_mapped_vertex_buffer(draw, i, buf, size);
  80    }
  81
  82    /* Map index buffer, if present */
  83    if (info->indexed) {
  84       unsigned available_space = ~0;
  85       mapped_indices = lp->index_buffer.user_buffer;
  86       if (!mapped_indices) {
  87          mapped_indices = llvmpipe_resource_data(lp->index_buffer.buffer);
  88          if (lp->index_buffer.buffer->width0 > lp->index_buffer.offset)
  89             available_space =
  90                (lp->index_buffer.buffer->width0 - lp->index_buffer.offset);
  91          else
  92             available_space = 0;
  93       }
  94       draw_set_indexes(draw,
  95                        (ubyte *) mapped_indices + lp->index_buffer.offset,
  96                        lp->index_buffer.index_size, available_space);
  97    }
  98
  99    for (i = 0; i < lp->num_so_targets; i++) {
 100       void *buf = 0;
 101       if (lp->so_targets[i]) {
 102          buf = llvmpipe_resource(lp->so_targets[i]->target.buffer)->data;
 103          lp->so_targets[i]->mapping = buf;
 104       }
 105    }
 106    draw_set_mapped_so_targets(draw, lp->num_so_targets,
 107                               lp->so_targets);
 108
 109    llvmpipe_prepare_vertex_sampling(lp,
 110                                     lp->num_sampler_views[PIPE_SHADER_VERTEX],
 111                                     lp->sampler_views[PIPE_SHADER_VERTEX]);
 112    llvmpipe_prepare_geometry_sampling(lp,
 113                                       lp->num_sampler_views[PIPE_SHADER_GEOMETRY],
 114                                       lp->sampler_views[PIPE_SHADER_GEOMETRY]);
 115    if (lp->gs && !lp->gs->shader.tokens) {
 116       /* we have an empty geometry shader with stream output, so
 117          attach the stream output info to the current vertex shader */
 118       if (lp->vs) {
 119          draw_vs_attach_so(lp->vs->draw_data, &lp->gs->shader.stream_output);
 120       }
 121    }
 122    draw_collect_pipeline_statistics(draw,
 123                                     lp->active_statistics_queries > 0);
 124
 125    /* draw! */
 126    draw_vbo(draw, info);
 127
 128    /*
 129     * unmap vertex/index buffers
 130     */
 131    for (i = 0; i < lp->num_vertex_buffers; i++) {
 132       draw_set_mapped_vertex_buffer(draw, i, NULL, 0);
 133    }
 134    if (mapped_indices) {
 135       draw_set_indexes(draw, NULL, 0, 0);
 136    }
 137    draw_set_mapped_so_targets(draw, 0, NULL);
 138
 139    if (lp->gs && !lp->gs->shader.tokens) {
 140       /* we have attached stream output to the vs for rendering,
 141          now lets reset it */
 142       if (lp->vs) {
 143          draw_vs_reset_so(lp->vs->draw_data);
 144       }
 145    }
 146
 147    llvmpipe_cleanup_vertex_sampling(lp);
 148    llvmpipe_cleanup_geometry_sampling(lp);
 149
 150    /*
 151     * TODO: Flush only when a user vertex/index buffer is present
 152     * (or even better, modify draw module to do this
 153     * internally when this condition is seen?)
 154     */
 155    draw_flush(draw);
 156 }
 157
 158
 159 void
 160 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
 161 {
 162    llvmpipe->pipe.draw_vbo = llvmpipe_draw_vbo;
 163 }